WorldWideScience

Sample records for alps

  1. ALP - blood test

    Science.gov (United States)

    ... page: //medlineplus.gov/ency/article/003470.htm ALP - blood test To use the sharing features on this page, ... include the liver, bile ducts, and bone. A blood test can be done to measure the level of ...

  2. ALPES: an advanced logic programming environment

    Directory of Open Access Journals (Sweden)

    Cristina Ruggieri

    1988-11-01

    Full Text Available This paper introduces a software programming environment for an extended Prolog language, called ALPES. The purpose of ALPES is to enable a logic programming paradigm to become a software engineering tool to design, develop and prototype traditional software systems, as well as artificial intelligence applications. The key structuring concepts for programs, as well as for the system architecture as a whole are those of contexts, processes and communication. The software design and development methodologies induced by the use of the Alpes-Prolog language have been incrementally used to develop the environment itself. This research was conducted under the Esprit projects P973 (ALPES.

  3. Status of the ALPS experiment

    International Nuclear Information System (INIS)

    Ehret, Klaus

    2008-01-01

    The ALPS experiment at DESY searches for light particles which are coupling very weakly to photons. Primary physics goal is the search for axion like particles in a photon regeneration experiment. Central part of the experimental setup is a five Tesla strong superconducting HERA dipole magnet. During two operation periods in the years 2007 and 2008 we have collected first data and explored the sensitivity of the setup. A Fabry Perot laser cavity is being set up in order to increase the sensitivity by more than one order of magnitude. (orig.)

  4. Seismotectonics investigations in the internal Cottian Alps (Italian Western Alps)

    Science.gov (United States)

    Perrone, Gianluigi; Eva, Elena; Solarino, Stefano; Cadoppi, Paola; Balestro, Gianni; Fioraso, Gianfranco; Tallone, Sergio

    2010-05-01

    The inner Cottian Alps represent an area of a low- to moderate- magnitude seismicity (Eva et al., 1990) even though some historical earthquakes reached VIII degree of the Mercalli's scale. Although the frame of seismicity is quite well known, the relation between faults and earthquake sources is still under debate. The low deformation rates and the occurrence of several glacial-interglacial cycles during the Pleistocene partly masked the geomorphological evidences of the recent tectonic activity. Recent studies based on field mapping and structural analysis (Balestro et al., 2009; Perrone et al., 2009) allowed characterizing the size and extension of the regional-scale faults dissecting this area of the Western Alps. Here, we combine the results of these novel studies and updated seismological data with the aim to investigate the relations between mapped faults and seismic activity. In the analyzed area both continental crust and oceanic tectonic units, belonging to the Penninic Domain of the Western Alps, crop out. The main brittle tectonic feature of this area is represented by the Lis-Trana Deformation Zone (LTZ), an N-S striking, steep structure that extends for about 35 km from the Lower Lanzo valleys to the Lower Sangone Valley. The occurrence of steep faults displacing the metamorphic basement, showed in seismic sections carried out for oil exploration (Bertotti & Mosca, 2009), suggests that the LTZ may be prolonged Southward beneath the Plio-Quaternary deposits of the Po Plain. West of the LTZ some other minor E-W and N-S faults are also present. Zircon and apatite fission-track data indicate that the activity of these faults started since the Oligocene. Two main faulting stages characterize the post-metamorphic structural evolution of this area: the earlier (faulting stage A; Oligocene?-Early Miocene?) is associated to right-lateral movements along the LTZ and sinistral movements along E-W faults; the subsequent faulting stage (faulting stage B; post

  5. P wave anisotropic tomography of the Alps

    Science.gov (United States)

    Hua, Yuanyuan; Zhao, Dapeng; Xu, Yixian

    2017-06-01

    The first tomographic images of P wave azimuthal and radial anisotropies in the crust and upper mantle beneath the Alps are determined by joint inversions of arrival time data of local earthquakes and teleseismic events. Our results show the south dipping European plate with a high-velocity (high-V) anomaly beneath the western central Alps and the north dipping Adriatic plate with a high-V anomaly beneath the Eastern Alps, indicating that the subduction polarity changes along the strike of the Alps. The P wave azimuthal anisotropy is characterized by mountain chain-parallel fast-velocity directions (FVDs) in the western central Alps and NE-SW FVDs in the Eastern Alps, which may be caused by mantle flow induced by the slab subductions. Our results reveal a negative radial anisotropy (i.e., Vph Vph > Vpv) in the low-velocity mantle wedge, which may reflect the subvertical plate subduction and its induced mantle flow. The results of anisotropic tomography provide important new information on the complex mantle structure and dynamics of the Alps and adjacent regions.

  6. The epic of Hannibal through the Alps

    Directory of Open Access Journals (Sweden)

    Arbia Hilali

    2018-02-01

    Full Text Available A true myth is built around the figure of Hannibal and his journey to Rome through the Alps. After leaving the South of the Iberian Peninsula to his brother Hasdrubal, Hannibal leaves Cartagena, crosses the Pyrenees, goes up the valleys of the Rhone and Isere, crosses the Alps and ends in Italy in November 218 BC. Its stratagems are still authoritative, not to mention the exotic image of fighting elephants that have deeply marked the spirits. The crossing of the Alps has nourished art and ancient and modern literature. In contemporary Tunisia, antiquity finds a fundamental place and Hannibal redux is a national hero.

  7. Seismicity of Eastern Alps and North western Dinaric Alps

    Science.gov (United States)

    Ertuncay, Deniz; Vicic, Blaž; Costa, Giovanni

    2017-04-01

    Our study region is placed on Adriatic Plate and the boundaries are Dinaric Orogenic Belt, Carnic, Tolmezzo and Julian Alps. The area has normal, reverse and strike slip faults which can generate big earthquakes such as 1976 Mw 6.5 Friuli Earthquake, 1998 and 2004 Bovec-Krn Earthquakes. The area is located between Austria, Slovenia and Italy. Our group, SEISRAM, has dense seismic station on the Italian part of the region and has access to get data from other countries on the region. We are monitoring the region with a good coverage by collaborating with other institutes on the Ce3RN project which we are also part of. We can detect lower than 0.5 Magnitude earthquakes. We use our database and other seismological centers to investigate the seismicity of the region between 1960 and 2016. Gutenberg - Richter magnitude frequency relationship is applied in order to get a knowledge about the seismicity of Friuli region. By using the database 'a' and 'b' values of the region are found. Same procedure is done for each fault line, separately. Magnitude of completeness for each fault are calculated. Calculation of earthquake probabilities for fixed periodic times for possible from magnitude 3 to magnitude 6 earthquakes. All calculations are done by using Matlab based ZMAP program.

  8. Age and prematurity of the Alps

    Science.gov (United States)

    Hergarten, Stefan; Stüwe, Kurt; Wagner, Thomas

    2010-05-01

    Although the Alps are among the best studied mountain ranges on Earth, the age of their topography is almost unknown. Even their relative stage of evolution is unclear: Are the Alps still growing, in a steady state or even decaying? Using the mean slope at given catchment size as a new geomorphic parameter we analyse the topography of the Alps. Our analysis provides one of the first quantitative constraints that shows that the range is still in its infancy: In contrast to several other mountain ranges, the Alps have still more than half of their evolution to a geomorphic steady state to go. Combining our results with sediment data from the surrounding accumulation spaces we infer that the formation of substantial topography began only 5-6 million years ago. Our results challenge a general consensus that the topographic evolution is distributed over much of the Miocene.

  9. CERN: LEP in the Alps

    International Nuclear Information System (INIS)

    Anon.

    1993-01-01

    Full text: In January, when CERN's LEP electron-positron collider is enjoying a well-earned break, it has now become traditional for the hard pressed LEP team to have no respite. Instead they pack their bags and depart for Chamonix in the nearby French Alps to review the past year's experience and plan for the future. In the cold January 1993 light of Chamonix, 1992 (January/February, page 4) was deemed to have been a good year for LEP operations, with the switch to 90° betatron phase operation having paid off. The 65% improvement in integrated luminosity over 1991 was attributed to longer beam lifetimes, faster filling and improved overall efficiency. The commissioning of the eight-bunch 'pretzel' scheme was facilitated with the new optics, and break-even quickly achieved, so that physics could benefit from more bunches in the machine. During 1992, the injection chain was fully tested with eight bunches, and when this comes into routine operation this year, the pretzel scheme will benefit. Pretzel running also opens the possibility of still higher luminosity, up to 2x10 31 per sq cm per s, doubling the present level. However the finishing touches to high luminosity running are still more an art ('haute cuisine') than a science. Continuing studies of the inter correlation of different LEP conditions will help make this more systematic. The main factors affecting performance at 45 GeV are transverse mode coupling instabilities. The present working point gives good results, but there are still potentially interesting regions which need to be checked out. Beam lifetime and background are both limited by beam size and aperture. Background was reduced by improved focusing, while beam size is dominated by beam-beam effects. 90° operation proved its worth in 1992, but the inability to produce polarized beams was a disappointment, and a combined 90°/60° horizontal/vertical combination looked like offering the best of both worlds. Although

  10. Urbanization and depopulation in the Alps.

    Science.gov (United States)

    Batzing, W; Perlik, M; Dekleva, M

    1996-11-01

    Demographic developments in the European Alpine region are analyzed over the period 1870-1990. The region is defined as including parts of Germany, France, Italy, Liechtenstein, Austria, Switzerland, and Slovenia. "Studies of growth, stagnation, decline, commune size, and altitude in almost 6,000 communes are presented on three colored maps.... It is apparent that two highly divergent processes are at work and, accordingly, statistical mean values reveal little of importance. Approximately one-half of Alpine Europe is undergoing general economic and demographic growth and has experienced significant increase in population since the end of the agricultural era. This development has taken place primarily in low-lying valleys and basins and in areas bordering the Alps that have good access to transport routes. Tourism is not as widespread as generally assumed and is usually characterized by a punctate pattern. Only in the western part of the Eastern Alps does tourism account for widespread population growth at higher altitudes; elsewhere the Alps have not been affected by modern development and the economy and population are declining, with some areas in danger of becoming completely abandoned. The results challenge the earlier concept of the Alps as a rural region, once populated by peasants, where tourism now plays a major role." (EXCERPT)

  11. An economics figure of merit in ALPS

    International Nuclear Information System (INIS)

    Shatilla, Y.A.

    2000-01-01

    One of the most pressing issues facing the deregulated nuclear electric power industry is its economic competitiveness when compared to other sources of electrical power. Traditionally, finding the optimum loading pattern (LP) that meets all the safety and operational objective functions and at the same time produces the most attractive economical solutions is an iterative process. This is because (a) LP search tools usually lack the capability to generate equilibrium solutions and (b) economics objective functions are hard to include in the search process. In this paper, the Westinghouse Advanced Loading Pattern Search code (ALPS) has been demonstrated to successfully find LPs that meet user-defined operational and safety as well as economics objectives. This has been made possible by the development of TULIP language that allows the integration of external procedures into the search process of the main program, ALPS. In the example given, an economic figure of merit (EFM) has been defined and included via TULIP script into the fuel management optimization problem of a three-loop Westinghouse core operating an 18-month cycle. The LPs found by ALPS exhibit a clear trend of meeting and, in some cases, exceeding the EFM objective function defined for the ALPS search process a priori

  12. Glacial isostatic uplift of the European Alps.

    Science.gov (United States)

    Mey, Jürgen; Scherler, Dirk; Wickert, Andrew D; Egholm, David L; Tesauro, Magdala; Schildgen, Taylor F; Strecker, Manfred R

    2016-11-10

    Following the last glacial maximum (LGM), the demise of continental ice sheets induced crustal rebound in tectonically stable regions of North America and Scandinavia that is still ongoing. Unlike the ice sheets, the Alpine ice cap developed in an orogen where the measured uplift is potentially attributed to tectonic shortening, lithospheric delamination and unloading due to deglaciation and erosion. Here we show that ∼90% of the geodetically measured rock uplift in the Alps can be explained by the Earth's viscoelastic response to LGM deglaciation. We modelled rock uplift by reconstructing the Alpine ice cap, while accounting for postglacial erosion, sediment deposition and spatial variations in lithospheric rigidity. Clusters of excessive uplift in the Rhône Valley and in the Eastern Alps delineate regions potentially affected by mantle processes, crustal heterogeneity and active tectonics. Our study shows that even small LGM ice caps can dominate present-day rock uplift in tectonically active regions.

  13. Crustal structure due to collisional and escape tectonics in the Eastern Alps region based on profiles Alp01 and Alp02 from the ALP 2002 seismic experiment

    Czech Academy of Sciences Publication Activity Database

    Brückl, E.; Bleibinhaus, F.; Gosar, A.; Grad, M.; Guterch, A.; Hrubcová, Pavla; Keller, G. R.; Majdański, M.; Šumanovac, F.; Tiira, T.; Yliniemi, J.; Hegedüs, E.; Thybo, H.

    2007-01-01

    Roč. 112, č. B6 (2007), B06308/1-B06308/25 ISSN 0148-0227 R&D Projects: GA MŽP SB/630/3/02 Institutional research plan: CEZ:AV0Z30120515 Keywords : crustal structure * ALP 2002 seismic experiment * seismic refraction Subject RIV: DC - Siesmology, Volcanology, Earth Structure Impact factor: 2.953, year: 2007

  14. Steady-State ALPS for Real-Valued Problems

    Science.gov (United States)

    Hornby, Gregory S.

    2009-01-01

    The two objectives of this paper are to describe a steady-state version of the Age-Layered Population Structure (ALPS) Evolutionary Algorithm (EA) and to compare it against other GAs on real-valued problems. Motivation for this work comes from our previous success in demonstrating that a generational version of ALPS greatly improves search performance on a Genetic Programming problem. In making steady-state ALPS some modifications were made to the method for calculating age and the method for moving individuals up layers. To demonstrate that ALPS works well on real-valued problems we compare it against CMA-ES and Differential Evolution (DE) on five challenging, real-valued functions and on one real-world problem. While CMA-ES and DE outperform ALPS on the two unimodal test functions, ALPS is much better on the three multimodal test problems and on the real-world problem. Further examination shows that, unlike the other GAs, ALPS maintains a genotypically diverse population throughout the entire search process. These findings strongly suggest that the ALPS paradigm is better able to avoid premature convergence then the other GAs.

  15. Cultures et politiques dans les Alpes contemporaines

    Directory of Open Access Journals (Sweden)

    Bernard Debarbieux

    2009-03-01

    Full Text Available Plus que jamais, l’espace alpin est marqué par le déploiement de flux toujours plus variés, toujours plus puissants, et symétriquement par la multiplication d’initiatives destinées à conforter ou à régénérer l’idée de localité. Quelles spatialités et quelles territorialités travaillent les populations alpines aujourd’hui ? Quelles sont les figures contemporaines de la circulation et des flux, et les figures complémentaires de l’ancrage et de la refondation territoriale ? Voici les questions que cet essai se propose de développer. Ce texte reprend le contenu d’une conférence donnée dans le cadre de la célébration du centenaire de l’Institut de Géographie Alpine. Cette conférence, comme les autres données à cette occasion, avait adopté une forme libre dressant un bilan et des perspectives de la situation alpine. La trace écrite adoptée ici prend alors logiquement la forme d’un essai.More than ever before, the Alps are affected by increasingly varied and powerful flows and equally by the multiplication of initiatives designed to strengthen or regenerate the idea of “locality” (place. What spatialities and what territorialities activate the populations of the Alps today? What are the contemporary figures relating to circulation and flows and the complementary figures concerning spatial “anchoring” or fixity and new territorial foundations? These are the questions that this essay, proposes to develop. This text takes another look at the subject of a lecture given as part of celebrations to mark the centenary of the Institut de Géographie Alpine. This lecture, like the others given on this occasion, adopted a free format, presenting a report on the current situation in the Alps and prospects for the future. The written format adopted here logically takes the form of an essay. Readers looking for detailed illustrations and references are referred to three scientific articles published by the same

  16. Galaxy Clusters as Tele-ALP-scopes

    CERN Multimedia

    CERN. Geneva

    2015-01-01

    Axion-like particles have good theoretical motivation and are characterized by conversion to photons in astrophysical magnetic fields. Galaxy clusters are the most efficient convertors of axion-like particles to photons in the universe. I discuss the physics and phenomenology of ALPs, and describe their astrophysical implications, with particular reference to the recently observed 3.5 keV X-ray line that is a candidate for a dark matter decay line. I discuss interpretations of this line in terms of dark matter decaying to an axion-like particle, that then converts to a photon in cluster magnetic fields, and describe the compatibility of this scenario with data and the different phenomenology for cool-core and non-cool-core clusters.

  17. Rock glacier inventory, Hautes Alpes Calcaires, Switzerland, Version 1

    Data.gov (United States)

    National Aeronautics and Space Administration — The Hautes Alpes Calcaires is a limestone range in the northern part of the Rhone Valley (Switzerland). It is characterized by a transitional climate between the wet...

  18. Western Italian Alps Monthly Snowfall and Snow Cover Duration

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set consists of snow observations for 18 stations in the western Italian Alps. Two types of data are included: monthly snowfall amounts and monthly snow...

  19. ALP and MLP distribution during myofibrillogenesis in cultured cardiomyocytes.

    Science.gov (United States)

    Henderson, James R; Pomiès, Pascal; Auffray, Charles; Beckerle, Mary C

    2003-03-01

    The Z-line is a multifunctional macromolecular complex that anchors sarcomeric actin filaments, mediates interactions with intermediate filaments and costameres, and recruits signaling molecules. Antiparallel alpha-actinin homodimers, present at Z-lines, cross-link overlapping actin filaments and also bind other cytoskeletal and signaling elements. Two LIM domain containing proteins, alpha-actinin associated LIM protein (ALP) and muscle LIM protein (MLP), interact with alpha-actinin, distribute in vivo to Z-lines or costameres, respectively, and, when absent, are associated with heart disease. Here we describe the behavior of ALP and MLP during myofibrillogenesis in cultured embryonic chick cardiomyocytes. As myofibrils develop, ALP and MLP are observed in distinct distribution patterns in the cell. ALP is coincident with alpha-actinin from the first stage of myofibrillogenesis and co-distributes with alpha-actinin to Z-lines and intercalated discs in mature myofibrils. Interestingly, we also demonstrate using ALP-GFP transfection experiments and an in vitro binding assay that the ALP-alpha-actinin binding interaction is not required to target ALP to the Z-line. In contrast, MLP localization is not co-incident with that of alpha-actinin until late stages of myofibrillogenesis; however, it is present in premyofibrils and nascent myofibrils prior to the incorporation of other costameric components such as vinculin, vimentin, or desmin. Our observations support the view that ALP function is required specifically at actin anchorage sites. The subcellular distribution pattern of MLP during myofibrillogenesis suggests that it functions during differentiation prior to the establishment of costameres. Copyright 2003 Wiley-Liss, Inc.

  20. Age and Prematurity of the Alps Derived from Topography

    Science.gov (United States)

    Hergarten, S.; Wagner, T.; Stüwe, K.

    2010-09-01

    The European Alps are one of the best studied mountain ranges on Earth, but yet the age of their topography is almost unknown. Even their relative stage of evolution is unclear: Are the Alps still growing, in a steady state or already decaying, and is there a significant difference between Western and Eastern Alps? Using a new geomorphic parameter we analyze the topography of the Alps and provide one of the first quantitative constraints demonstrating that the range is still in its infancy: In contrast to several other mountain ranges, the Alps have still more than half of their evolution to a geomorphic steady state to go. Combining our results with sediment budget data from the surrounding basins we infer that the formation of the present topography began only 5-6 million years ago. Our results question the apparent consensus that the topographic evolution is distributed over much of the Miocene and might give new impulses to the reconstruction of paleoclimate in Central Europe.

  1. Approaches to managing cytopenias in Autoimmune Lymphoproliferative Syndrome (ALPS.

    Directory of Open Access Journals (Sweden)

    V. Koneti eRao

    2015-07-01

    Full Text Available Autoimmune Lymphoproliferative Syndrome (ALPS is a rare disorder frequently due to mutations in FAS (TNFRSF6 gene. Unlike most of the self limiting autoimmune cytopenias sporadically seen in childhood, multi lineage cytopenias due to ALPS are often refractory as their inherited genetic defect is not going to go away. Historically more ALPS patients have died due to overwhelming sepsis following splenectomy to manage their chronic cytopenias than due to any other cause, including malignancies. Hence current recommendations underscore the importance of avoiding splenectomy in ALPS, by long-term use of corticosteroid sparing immunosuppressive agents like mycophenolate mofetil and sirolimus. Paradigms learnt from managing ALPS patients in recent years is highlighted here and can be extrapolated to manage refractory cytopenias in patients with as yet undetermined genetic bases for their ailments. It is also desirable to develop international registries for children with rare and complex immune problems associated with chronic multilineage cytopenias in order to elucidate their natural history and long-term comorbidities due to their disease and its treatments.

  2. Status and distribution of the lynx in the German Alps

    Directory of Open Access Journals (Sweden)

    Petra Kaczensky

    1998-09-01

    Full Text Available Abstract The lynx (Lynx lynx had been eradicated in the German Alps by the middle of the 19th century. Since the early 1970s there have been several attempts to initiate the re-introduction of lynx into the German Alps, but none of the projects could be carried out because of the still very controversial attitudes towards the species, and because of competition between institutions. Natural re-colonization of the German Alps by lynx can be expected sooner or later from Switzerland or Austria. Although lynx are already present in some parts of Germany outside the Alps, neither an organized monitoring system nor compensation regulations for losses of livestock exist. For a successful comeback of lynx into Germany, including the German Alps, more efforts than a year-round protection by the federal hunting law is needed. Initiative management actions and intensive public education are necessary to obtain and secure public acceptance of the lynx.

  3. Searching for axions and ALPs from string theory

    Energy Technology Data Exchange (ETDEWEB)

    Ringwald, Andreas

    2012-09-15

    We review searches for closed string axions and axion-like particles (ALPs) in IIB string flux compactifications. For natural values of the background fluxes and TeV scale gravitino mass, the moduli stabilisation mechanism of the LARGE Volume Scenario predicts the existence of a QCD axion candidate with intermediate scale decay constant, f{sub a} {proportional_to}10{sup 9/12} GeV, associated with the small cycles wrapped by the branes hosting the visible sector, plus a nearly massless and nearly decoupled ALP associated with the LARGE cycle. In setups where the visible sector branes are wrapping more than the minimum number of two intersecting cycles, there are more ALPs which have approximately the same decay constant and coupling to the photon as the QCD axion candidate, but which are exponentially lighter. There are exciting phenomenological opportunities to search for these axions and ALPs in the near future. For f{sub a} {proportional_to}10{sup 11/12} GeV, the QCD axion can be the dominant part of dark matter and be detected in haloscopes exploiting microwave cavities. For f{sub a} {proportional_to}10{sup 9/10} GeV, the additional ALPs could explain astrophysical anomalies and be searched for in the upcoming generation of helioscopes and light-shining-through-a-wall experiments.

  4. Receiver function analysis using AlpArray stations in Hungary

    Science.gov (United States)

    Dániel, Kalmár; Bálint, Süle; István, Bondár

    2017-04-01

    The AlpArray temporary seismic network, together with the permanent stations of the Hungarian National Seismological Network provid an unprecedented density and resolution to study the Eastern Alps - Pannonian basin transition zone. Previous receiver functions studies .(Hetényi et al., 2007, 2015) in the region used a much smaller station density and shorter time period than the present paper. In the analysis we used data from 48 permanent and temporary AlpArray stations in Hungary and neighbouring countries. We present our methodology (P-wave receiver function analysis, H-K grid search and cross-correlation matrix methods), the pitfalls in processing, and finally our result, the detailed Moho map of the region.

  5. Characterization of optical systems for the ALPS II experiment

    Energy Technology Data Exchange (ETDEWEB)

    Spector, Aaron D. [Hamburg Univ. (Germany). Inst. fuer Experimentalphsik; Pold, Jan H.; Lindner, Axel [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Baehre, Robin; Willke, Benno [Max-Planck-Institute for Gravitational Physics, Hannover (Germany); Hannover Univ. (Germany). Inst. fuer Gravitationsphysik

    2016-09-15

    ALPS II is a light shining through a wall style experiment that will use the principle of resonant enhancement to boost the conversion and reconversion probabilities of photons to relativistic WISPs. This will require the use of long baseline low-loss optical cavities. Very high power build up factors in the cavities must be achieved in order to reach the design sensitivity of ALPS II. This necessitates a number of different sophisticated optical and control systems to maintain the resonance and ensure maximal coupling between the laser and the cavity. In this paper we report on the results of the characterization of these optical systems with a 20m cavity and discuss the results in the context of ALPS II.

  6. Characterization of optical systems for the ALPS II experiment

    International Nuclear Information System (INIS)

    Spector, Aaron D.; Baehre, Robin; Willke, Benno; Hannover Univ.

    2016-09-01

    ALPS II is a light shining through a wall style experiment that will use the principle of resonant enhancement to boost the conversion and reconversion probabilities of photons to relativistic WISPs. This will require the use of long baseline low-loss optical cavities. Very high power build up factors in the cavities must be achieved in order to reach the design sensitivity of ALPS II. This necessitates a number of different sophisticated optical and control systems to maintain the resonance and ensure maximal coupling between the laser and the cavity. In this paper we report on the results of the characterization of these optical systems with a 20m cavity and discuss the results in the context of ALPS II.

  7. Water Management Strategies against Water Shortage in the Alps (Invited)

    Science.gov (United States)

    de Jong, C.

    2009-12-01

    In the European Alps water has been perceived as ubiquitous and not the subject of management. Climate change and anthropogenic pressures have changed demand and supply relations rapidly and over the last 10 years, water problems have increasingly become apparent over temporal and spatial hotspots. Stakeholders in the Alpine Space have been confronted with water management problems in agriculture, tourism and hydropower to such an extent that they approached scientists to create solution strategies based on adaptation and mitigation. In this context, Alp-Water-Scarce, a European project on Water Management Strategies against Water Scarcity in the Alps was funded by the Alpine Space programme as part of the "European Territorial Cooperation" scheme. It has 17 project partners from Austria Switzerland, France, Italy and Slovenia from local governments, provinces, federal institutes and offices, universities, regional agencies, alpine societies, geological surveys, and chambers of agriculture and forestry. The Lead Partner is the Mountain Institute in Savoy, Rhone-Alpes, France. The main challenges of this project are to create local Early Warning Systems against Water Scarcity in the Alps. This system is based on strengthening existing long-term monitoring and modeling and creating new measuring networks in those countries where they do not yet exist. It is anchored strongly and actively within a Stakeholder Interaction Forum linked across comparative and contrasting regions across the Alps. The Early Warning System is based on the linkage and improvement of field monitoring and assemblage of qualitative and quantitative data derived both from natural water reservoirs as well as from anthropogenic water use in 28 selected pilot regions selected in France, Italy, Austria, Slovenia and Switzerland. The objectives are to improve water management at the short term (annual scale) and long term (using future scenarios) based on modelling and application of climate change

  8. [Evaluation of the test strip Reflotron ALP (alkaline phosphatase) for blood samples of dogs and cats].

    Science.gov (United States)

    Hirschberger, J; Dietz, J; Baumeister, C; Kraft, M

    1998-09-01

    The test strip Reflotron ALP (alcaline phosphatase) was evaluated for use in canine and feline heparinized blood samples. The within-run and the day-to-day precision of blood and plasma samples was excellent. A haematocrit up to 60% of canine blood and up to 50% of feline blood had no influence on the measurements. Reflotron ALP was compared with ALP on Hitachi 717 (Boehringer Mannheim, Mannheim, Germany). The correlation of both methods was good for canine and feline blood samples. Reflotron ALP was higher than Hitachi ALP in both species. Despite an enormous deviation between Reflotron ALP and the reference method of canine and feline blood samples within the reference range, Reflotron ALP is a suited test for the detection of elevated ALP activity in canine and feline blood samples. Differences of the ALP activity might be caused by ALP isoenzymes. The activity of ALP isoenzymes depends on the method. The buffer systems of Reflotron ALP and Hitachi ALP are different. Significant exceeding of the reference range was reliably detected. In this investigation the study results for heparinized whole blood, heparinized plasma and serum are approximately the same.

  9. Sensitivity and Specificity of Plasma ALT, ALP, and Bile Acids for Hepatitis in Labrador Retrievers

    NARCIS (Netherlands)

    Dirksen, K|info:eu-repo/dai/nl/412424428; Burgener, I A; Rothuizen, J|info:eu-repo/dai/nl/071276033; van den Ingh, T S G A M; Penning, L C|info:eu-repo/dai/nl/110369181; Spee, B|info:eu-repo/dai/nl/304830925; Fieten, H|info:eu-repo/dai/nl/314112596

    2017-01-01

    BACKGROUND: Biochemical indicators for diagnosing liver disease are plasma alanine aminotransferase activity (ALT), alkaline phosphatase activity (ALP), and bile acid concentration (BA). OBJECTIVES: To determine the sensitivity and specificity of ALT, ALP, and BA for detecting primary hepatitis (PH)

  10. Australian Alps: Kosciuszko, Alpine and Namadgi National Parks (Second Edition

    Directory of Open Access Journals (Sweden)

    Nicole Porter

    2017-02-01

    Full Text Available Reviewed: Australian Alps: Kosciuszko, Alpine and Namadgi National Parks (Second Edition By Deidre Slattery. Clayton South, Australia: CSIRO Publishing, 2015. xvii + 302 pp. AU$ 45.00, US$ 35.95. ISBN 978-1-486-30171-3.

  11. The Geology of the Bergamasc Alps Lombardia Italy

    NARCIS (Netherlands)

    Sitter, de L.U.; Sitter-Koomans, de C.M.

    1949-01-01

    In the Bergamasc Alps we have observed one major unconformity between the Basement rock and the overlying Permian. The total absence of any recognisable Palaeozoic sedimentary rocks accentuates this unconformity, and moreover this enormous hiatus makes the dating of any Palaeozoic event impossible.

  12. Traditional phytotherapy of the Albanians of Lepushe, Nothern Albanian Alps

    NARCIS (Netherlands)

    Pieroni, A.; Dibra, B.; Grishaj, G.; Grishaj, I.; Maçai, S.G.

    2005-01-01

    An ethnobotanical and ethnopharmacognostic survey has been carried out in one of the most isolated mountainous area in Europe: the village of Lepushe and its surrounding territory, in the Northern Albanian Alps. Approximately 70 botanical taxa and 160 preparations, mainly derived from plants, but

  13. Military-geographic evaluation of the Julian Alps area

    Directory of Open Access Journals (Sweden)

    Zvonimir Bratun

    1999-12-01

    Full Text Available The Julian Alps have been of military significance since Roman times in a military geographic sense because of its valleys, mountain passes and lines of defence on mountain ridges. They became especially important in the 19th and 20th century. The largest mountain front in World War I was located there,and evidence of that front is still visible today. The border between Italy and Yugoslavia in the heart of the Julian Alps was clearly a line of demarcation along the Soča and Sava watersheds and was reinforced with fortification, obstacles and trenches. During the Cold War, there was an ideological line of demarcation along the western edge of the Julian Alps as well. Military strategy in that area included the use of military geographic approaches in both westerly and easterly directions. After the geopolitical changes of 1991, the Julian Alps no longer had same military geographic significance in terms of Slovenian national security. Today other military activities are more important: training under mountains conditions for NATO soldiers, non-commissioned and commissioned officers takes place in the Pokljuka region and on the Triglav mountain chain. Military facilities have been taken on significance in the terms of tourism as well.

  14. New, rare or remarkable microfungi in the Italian Alps (Carnic Alps)--part I--ascomycotina.

    Science.gov (United States)

    Feige, G B; Ale-Agha, N; Jensen, M; Christiaans, B; Kricke, R

    2004-01-01

    During our observations in the SE part of the Carnic Alps in the year 2003 we were able to collect and identify 35 ascomycetes on trees and dead wood. Among these one can find numerous ascomycetes of different orders e.g. Pyrenomycetes, Loculoascomycetes and Discomycetes. Some species like Botryosphaeria ribis GROSENLUCHER & DUGGAR on Ribes alpinum L., Dothiora pyrenophora (FR.) FR. on Sorbus aucuparia L., Gemmamyces piceae (BORTH.) CASAGO. on Picea excelsa (LAM.) LINK, Glomerella montana (SACC.) v. ARX & E. MULLER on Sesleria caerulea (L.) ARD, Hymenoscyphus immutabilis (Fuck.) Dennis on Alnus incana (L.) Moench, Hysterographium fraxini (PERS. Ex. FR.) de Not. on Fraxinus ornus L., Lachnellula willkommii (Hartig) DENNIS [= Trichascyphella willkommii (Hartig) NANNF.] on Larix decidua MILL.,Leptosphaeria lycopodina (Mont.) SACC. on Lycopodium annotinum L., Mollisia adenostylidis REHM. on Adenostyles glabra (MILL.) DC., Pezicula cinnamomea (DC.)SACC. [ana: Cryptosporiopsis quercina PETRAK] on Quercus robur L., Pyrenopeziza petiolaris (A. & S. Ex FR.) NANNF. on Acer pseudoplatanus L., Tapesia rosae (PERS.) FUCKEL on Rosa canina L., are new for this area. All specimen are deposited in the Herbarium ESS Mycotheca Parva, Collection G.B. Feige/N. Ale-Agha.

  15. Slab detachment under the Eastern Alps seen by seismic anisotropy.

    Science.gov (United States)

    Qorbani, Ehsan; Bianchi, Irene; Bokelmann, Götz

    2015-01-01

    We analyze seismic anisotropy for the Eastern Alpine region by inspecting shear-wave splitting from SKS and SKKS phases. The Eastern Alpine region is characterized by a breakdown of the clear mountain-chain-parallel fast orientation pattern that has been previously documented for the Western Alps and for the western part of the Eastern Alps. The main interest of this paper is a more detailed analysis of the anisotropic character of the Eastern Alps, and the transition to the Carpathian-Pannonian region. SK(K)S splitting measurements reveal a rather remarkable lateral change in the anisotropy pattern from the west to the east of the Eastern Alps with a transition area at about 12°E. We also model the backazimuthal variation of the measurements by a vertical change of anisotropy. We find that the eastern part of the study area is characterized by the presence of two layers of anisotropy, where the deeper layer has characteristics similar to those of the Central Alps, in particular SW-NE fast orientations of anisotropic axes. We attribute the deeper layer to a detached slab from the European plate. Comparison with tomographic studies of the area indicates that the detached slab might possibly connect with the lithosphere that is still in place to the west of our study area, and may also connect with the slab graveyard to the East, at the depth of the upper mantle transition zone. On the other hand, the upper layer has NW-SE fast orientations coinciding with a low-velocity layer which is found above a more-or-less eastward dipping high-velocity body. The anisotropy of the upper layer shows large-scale NW-SE fast orientation, which is consistent with the presence of asthenospheric flow above the detached slab foundering into the deeper mantle.

  16. Comment diffuser les savoirs à travers les Alpes ?

    Directory of Open Access Journals (Sweden)

    Wolfgang Pfefferkorn

    2009-03-01

    Full Text Available CIPRA’s Future in the Alps Project aims at showcasing examples of successful implementation and successful projects in the Alps, and making available to others the extensive pool of experience and practical knowledge that lies in these projects. But how to transfer knowledge in an area of some 14 million inhabitants with several linguistic and cultural regions in which thousands of projects are carried out each year, that all kinds of players who work and life in completely different contexts are able to learn and benefit from one another? How do you go about something like that?Le projet « Avenir dans les Alpes » de la CIPRA (Commission Internationale pour la Protection des Alpes a pour objectif de présenter des exemples de réalisations et de projets réussis dans les Alpes, et de mettre à disposition du public l’ensemble de l’expérience et des connaissances pratiques acquises dans le cadre de ces projets. Cependant, comment transférer les savoirs dans une zone comptant quelque 14 millions d’habitants, composée de plusieurs régions linguistiques et culturelles dans lesquelles des milliers de projets sont menés à bien chaque année, et dont tous les acteurs, qui travaillent et vivent dans des contextes complètement différents, sont capables d’apprendre et de tirer profit les uns des autres ? Comment aborder ce genre de cas ?

  17. Late Cretaceous to Miocene cooling patterns in the Eastern Alps reflecting tectonic interactions of the Alps-Adria-Carpathian system

    Science.gov (United States)

    van Gelder, Inge; Willingshofer, Ernst; Schuster, Ralf; Andriessen, Paul; Sokoutis, Dimitrios

    2017-04-01

    New structural and thermochronological (Rb-Sr biotite and zircon and apatite fission track) data constrain the deformation and exhumation history of the eastern most Alps and highlight distinct differences compared to the western Eastern Alps, including the Tauern Window. The new data has been collected along and in the surroundings of the Mur-Mürz fault (MMF), an area that hitherto had a scarce availability of low and medium temperature thermochronological data but is a key area to understand and quantify the influence of processes, such as Pannonian back-arc extension, on the Eastern Alps evolution. The obtained cooling ages document rapid (ca. 15°C/Ma) and diachronous exhumation during the Late Cretaceous to Paleocene with an eastward youngening of cooling ages across a greenschist facies normal shear zone. We interpret this cooling pattern as a post-metamorphic exhumation occurring during Campanian-Maastrichtian synorogenic extension that is characterized by an east directed migration. We suggest that oblique subduction of the Alpine Tethys or slab roll-back driven processes during final closure of the Neotethys could both be mechanisms that drive this eastward migration. Subsequently, the eastern most Alps reflect Eocene to Oligocene slow cooling (ca. 2°C/Ma) suggesting that the region was unaffected by significant crustal thickening or erosion which strongly contrasts with the units exposed in the Tauern Window and surrounding Austroalpine units. The slow cooling continued far into the Miocene and is contemporaneous with early Miocene kinematics that reflect a pre-extrusion NW-SE contraction followed by syn-extrusion NE-SW to NNE-SSW contraction recorded by middle Miocene strike-slip faulting. Field kinematics and cooling ages located on opposite sides of the MMF suggest that lateral extrusion in the eastern most Alps is not associated with significant vertical motions but is rather restricted to lateral motions along dispersed strike-slip faults. This

  18. No erosional control on the lateral growth of the Alps

    Science.gov (United States)

    Rosenberg, C. L.; Berger, A.

    2009-04-01

    On the base of literature data, we estimated the paleowidth of the Central Alps and the changing location of the inferred active fronts of the orogen from the Oligocene to the present. These compilations indicate that the absolute change of width, defined as the distance between the most external, but not necessarily active thrusts of the orogen was modest, amounting to less than 15 %, from 32 Ma to the present. This value lies within the error of estimate, and hence it is no sound evidence for lateral growth or retreat of the orogen. On the other hand the width of the active orogen, defined as the distance between the most external active thrusts, did increase in the early Miocene. This increase started already in the Oligocene as also concluded on the base of sedimentological findings, suggesting a continuous growth of thrusts through the Oligocene-Early Miocene interval (e.g. Schumacher et al., 1996). In the Late Miocene the active width of the Southern Alps decreased, as documented by a pre-Messinian out-of-sequence phase of thrusting (Lecco thrust; Schönborn, 1992) younger than the Milan Belt (Schönborn 1992). Increasing erosion rates are expected to reduce the width of the orogen, whereas decreasing rates are expected to increase its width (Beaumont et al., 1992). Therefore, following the example of previous investigations (Schlunegger et al., 2001; Schlunegger and Simpson, 2002; Willett et al., 2006) we compare the reconstructed changes of width of the Alps with the depositional budgets of the Alpine foreland basins (Kuhlemann, 2000) inferred to be a proxy for the erosion rates of the Alpine belt. This comparison shows that the most significant increases in erosion efficiency do not lead to a decrease in the active width of the orogen. This is indicated by the pronounced foreland-directed growth of the Alps after the Messinian, i.e., during the phase of greatest increase in the erosion rates of the orogen. The best regional examples are the northward shift

  19. Ontogeny, immunocytochemical localization, and biochemical properties of the pregnancy-associated uterine elastase/cathepsin-G protease inhibitor, antileukoproteinase (ALP): monospecific antibodies to a synthetic peptide recognize native ALP.

    Science.gov (United States)

    Simmen, R C; Michel, F J; Fliss, A E; Smith, L C; Fliss, M F

    1992-04-01

    Expression of the mRNA encoding the elastase/cathepsin-G protease inhibitor, antileukoproteinase (ALP), is highest in pig uterus during mid- and late pregnancy, suggesting a stage of pregnancy-dependent role for ALP in feto-maternal interactions. To elucidate a function for ALP in these events, immunogenic probes were developed to localize sites of ALP expression in the environment of the developing fetus. Monospecific antibodies raised against a 16-mer synthetic peptide corresponding to residues 21-36 (ALP 16P) of the deduced amino acid sequence of pig uterine ALP were generated by active immunization of sheep. ALP 16P conjugated to keyhole limpet hemocyanin elicited high titer antibodies that were specific to ALP. The antipeptide antibodies were used to characterize pig uterine ALP from allantoic fluids. Uterine ALP has an approximate mol wt of 14,000 and a pI of 8.2 and exhibits elastase inhibitor activity. Amino-terminal amino acid sequencing of uterine ALP indicated the sequence AENALKGGACPPRKIVQC, which has 44% identity with the corresponding region in human bronchial ALP. RIA for ALP, developed using ALP 16P as standard and iodinated tracer, demonstrated the presence of immunoreactive ALP in early, mid-, and late pregnant endometrium and myometrium, placenta, allantoic fluids, fetal cord blood, and fetal liver. ALP was undetectable in the maternal circulation. The ALP levels in endometrium, allantoic fluids, and fetal cord blood changed with the stage of pregnancy; however, ALP content in placenta, myometrium, and fetal liver, although different among tissues, remained invariant during gestation. By immunocytochemical analyses, ALP was localized in the glandular epithelium of the uterus, in placenta, and in fetal liver, consistent with the presence of immunoreactive ALP as measured by RIA. The localization of uterine ALP in placenta and its corresponding transport to fetal circulation provide strong evidence to support a physiological function for the

  20. The ALP-PALS Project: optimal coupling for laser propulsion

    Science.gov (United States)

    Boody, F. P.; Badziak, J.; Eckel, H.-A.; Gammino, S.; Krása, J.; Láska, L.; Mezzasalma, A.; Pakhomov, A. J.; Parys, P.; Pfeifer, M.; Pisarczyk, T.; Rohlena, K.; Schall, W.; Torrisi, L.; Wołowski, J.

    2006-05-01

    Since the early 1970s ablative laser propulsion (ALP) has promised to revolutionize space travel by reducing the 30:1 propellant/payload ratio needed for near-earth orbit by up to a factor of 50, by leaving the power source on the ground. But the necessary sub-ns high average power lasers were not available. Dramatic recent progress in laser diodes for pumping solid-state lasers is changing that. Recent results from military laser weapons R&D programs, combined with progress on ceramic disk lasers, suddenly promise lasers powerful enough for automobile-size, if not space shuttle-size payloads, not only the 4 - 10 kg "microsatellites" foreseen just a few years ago. For ALP, the 1.6-μm Er:YAG laser resonantly pumped by InP diode lasers is especially promising. Prior coupling experiments have demonstrated adequate coupling coefficients and specific impulses, but were done with too long pulses and too low pulse energies. The properties of ions produced and the ablated surface were generally not measured but are necessary for understanding and modeling propulsion properties. ALP-PALS will realistically measure ALP parameters using the Prague Asterix Laser System (PALS) high power photodissociation iodine laser (λ = 1.315 μm, E L <=1 kJ, τ ~ 400 ps, beam diameter ~29 cm, flat beam profile) whose parameters match those required for application. PALS' 1.3-μm λ is a little short (vs. 1.53-1.72 μm) but is the closest available and PALS' 2ω / 3ω capability allows wavelength dependence to be studied.

  1. Lichenized and lichenicolous fungi from the Albanian Alps (Kosovo, Montenegro)

    Science.gov (United States)

    Strasser, Eva A.; Hafellner, Josef; Stešević, Danijela; Geci, Fehmi; Mayrhofer, Helmut

    2016-01-01

    396 taxa (381 species) of lichenized and 45 species of lichenicolous fungi from the upper montane, subalpine and alpine belts of the Albanian Alps (= Prokletije Mountain Range, Bjeshkët e Nemuna) are presented. 92 lichenized and 26 lichenicolous fungi are new to Montenegro, 165 lichenized and 24 lichenicolous fungi are new to Kosovo, and 25 lichenized fungi (23 species) are new for the Balkan Peninsula. PMID:26869727

  2. BSM photon interaction for ALPS-II and beyond

    Energy Technology Data Exchange (ETDEWEB)

    Doebrich, Babette

    2012-12-15

    High-intensity photon beams can provide for a viable probe for many particles of Standard Model extensions. This workshop contribution briefly reviews the status of the second stage of the Any Light Particle Search (ALPS-II) at DESY, an experiment of the light-shining-through-a-wall type, as well as an idea to test asymptotically safe quantum gravity in a photon-scattering experiment.

  3. What's new in ALPS-II

    Energy Technology Data Exchange (ETDEWEB)

    Doebrich, Babette; Collaboration: ALPS-II collaboration

    2013-09-15

    This proceedings contribution gives a brief experimental update of the 'Any light particle search (ALPS) -II' at DESY which will be sensitive to sub-eV, very weakly coupled particles beyond the Standard Model. First data on hidden sector photon parameter space through photon-hidden photon oscillations in vacuum is expected in 2014. Axion-like particle search (implying the installation of superconducting HERA magnets) could be realized in 2017.

  4. Meteorological wind energy potential in the Alps using ERA40 and wind measurement sites in the Tyrolean Alps

    DEFF Research Database (Denmark)

    Draxl, Caroline; Mayr, Georg J.

    2011-01-01

    The peculiarities of meteorological wind potential in alpine settings compared to flatland and offshore sites are studied. Four data sources are used: Global reanalysis ERA40 from ECMWF, long-term stations in the Tyrolean Alps, spatially dense measurements near the best site and Doppler sodar wind...... profiles. Due to the decrease of density with height, alpine sites suffer from a nearly linear decrease of harvestable power with altitude, which is more than offset by the increase of wind speed at altitudes above 1.5 km MSL. ERA40 data show higher potential on the northern than on the southern side...... of the Alps. The best locations are not isolated peaks but ridges within wide orographic channels. The best potential sites in the Tyrolean part of the Alps have median wind speeds of up to 7.1 m s−1 and extractable potentials between 2900 and 1600 kWh per year and per square meter of rotor area. The profile...

  5. New, rare or remarkable microfungi in the Italian Alps (Carnic Alps)--part II--other microfungi.

    Science.gov (United States)

    Ale-Agha, N; Feige, G B; Jensen, M; Christiaans, B; Brassmann, M; Kricke, R

    2004-01-01

    In addition to the collection of Ascomycotina in the Carnic Alps (see New, rare or remarkable microfungi in the Italian Alps (Carnic Alps) part I ) we were able to treasure about 300 species of parasitic and saprophytic microfungi. Among them Basidiomycetes, Ascomycetes and Deuteromycets like Bostrichonema polygoni (UNGER) SCHROT. on Polygonum viviparum L., Chrysomyxa rhododendri DE BY on Picea abies (L.) KARSTEN, Coleosporium tussilaginis (PERS.) BERK. I=C. cacaliae OTTH.] on Adenostyles glabra (MILL.) DC., Dasyscyphus barbatus (KUNZE) MASSEE on Lonicera nigra L., Leptosphaeria coniothyrium (FUCKEL) SACC. on Rosa canina L., Leptotrochila brunellae (LIND) DENNIS on Prunella grandiflora (L.) SCHOLLER., Marssonina kriegeriana (BES.) MAGNUS on Salix reticulata L., Puccinia alpina FUCKEL on Viola biflora L., Puccinia maculosa (STRAUSS.) ROHLING and Erysiphe cichoracearum DC. On Prenanthes purpurea L., Septoria microsora SPENG. on Gentianella germanica (WILLD.) BORNER, Urocystis orobranches (FR.) FISCH. V. WALDH. on Orobranche gracilis SM., Urocystis violae (J. SOWERBY) A. FISCHER VON WALDHEIN on Viola biflora L. and Uromyces phyteumatum (DC.) UNG. on Phyteuma spicatum L. were dominant. All samples are located in the Herbarium ESS Mycotheca Parva, Collection G.B. Feige/N. Ale-Agha.

  6. Modelling last glacial cycle ice dynamics in the Alps

    Science.gov (United States)

    Seguinot, Julien; Jouvet, Guillaume; Huss, Matthias; Funk, Martin; Preusser, Frank

    2017-04-01

    The European Alps, cradle of pioneer glacial studies, are one of the regions where geological markers of past glaciations are most abundant and well-studied. Such conditions make the region ideal for testing numerical glacier models based on approximated ice flow physics against field-based reconstructions, and vice-versa. Here, we use the Parallel Ice Sheet Model (PISM) to model the entire last glacial cycle (120-0 ka) in the Alps, with a horizontal resolution of 1 km. Climate forcing is derived using present-day climate data from WorldClim and the ERA-Interim reanalysis, and time-dependent temperature offsets from multiple paleo-climate proxies, among which only the EPICA ice core record yields glacial extent during marine oxygen isotope stages 4 (69-62 ka) and 2 (34-18 ka) in agreement to geological reconstructions. Despite the low variability of this Antarctic-based climate forcing, our simulation depicts a highly dynamic ice cap, showing that alpine glaciers may have advanced many times over the foreland during the last glacial cycle. Cumulative basal sliding, a proxy for glacial erosion, is modelled to be highest in the deep valleys of the western Alps. Finally, the Last Glacial Maximum advance, often considered synchronous, is here modelled as a time-transgressive event, with some glacier lobes reaching their maximum as early as 27 ka, and some as late as 21 ka. Modelled ice thickness is about 900 m higher than observed trimline elevations, yet our simulation predicts little erosion at high elevation due to cold ice conditions.

  7. Snow chemistry of high altitude glaciers in the French Alps

    OpenAIRE

    MAUPETIT, FRANÇOIS; DELMAS, ROBERT J.

    2011-01-01

    Snow samples were collected as snowcores in the accumulation zone of four high altitude glaciers (2980–3540 m.a.s.l.) from each of the 4 highest mountain areas of the French Alps, during 3 consecutive years: 1989, 1990 and 1991. Sampling was performed in spring (∼ May), before the onset of late spring–summer percolation. The accumulated snow therefore reflects winter and spring conditions. A complementary sampling of fresh-snow was performed on an event basis, on one of the studied glaciers, ...

  8. New ALPS results on hidden-sector lightweights

    International Nuclear Information System (INIS)

    Ehret, Klaus; Ghazaryan, Samvel; Frede, Maik

    2010-01-01

    The ALPS collaboration runs a ''Light Shining through a Wall'' (LSW) experiment to search for photon oscillations into ''Weakly Interacting Sub-eV Particles'' (WISPs) often predicted by extensions of the Standard Model. The experiment is set up around a superconducting HERA dipole magnet at the site of DESY. Due to several upgrades of the experiment we are able to place limits on the probability of photon-WISP-photon conversions of a few x 10 -25 . These limits result in today's most stringent laboratory constraints on the existence of low mass axion-like particles, hidden photons and minicharged particles. (orig.)

  9. Crustal structure and active tectonics in the Eastern Alps

    DEFF Research Database (Denmark)

    Brückl, E.; Behm, M.; Decker, K.

    2010-01-01

    fragment (PA), was interpreted and a triple junction was inferred. The goal of this study has been to relate these deep crustal structures to active tectonics. We used elastic plate modeling to reconsider the Moho fragmentation. We interpret subduction of EU below AD and PA from north to south......During the last decade, a series of controlled source seismic experiments brought new insight into the crustal and lithospheric structure of the Eastern Alps and their adjacent tectonic provinces. A fragmentation of the lithosphere into three blocks, Europe (EU), Adria (AD), and the new Pannonian...

  10. ALP: universal DMD controller for metrology and testing

    Science.gov (United States)

    Hoefling, Roland; Ahl, Enrico

    2004-05-01

    The paper presents a current development in the field of high-speed spatial light modulators. The Digital Micromirror Device (DMD) developed and produced by Texas Instruments Inc. (TI) stimulated new approaches in photonics. Recently, TI introduced the Discovery general purpose chipset to support new business areas in addition to the mainstream application of DMD technology in digital projection. ViALUX developed the ALP parallel interface controller board as a Discovery 1100 accessory for high speed micromirror operation. ALP (Accessory Light Modulator Package) has been designed for use in optical metrology but is widely open for numerous applications. It allows for rapid launch into new DMD applications and can be integrated instantly into existing systems or may initiate new developments. The paper describes both, the general hardware architecture and the software concept of the new high-speed controller solution. Binary and gray-value patterns of variable bit-depth can be pre-loaded to on-board SDRAM via USB and transferred to DMD at high speed (up to 6900 XGA frames per second). Three examples are to illustrate how the approach enables advanced applications of DMD technology in metrology, testing and beyond.

  11. Distributed landsurface skin temperature sensing in Swiss Alps

    Science.gov (United States)

    van de Giesen, N.; Baerenbold, F.; Nadeau, D. F.; Pardyjak, E.; Parlange, M. B.

    2010-12-01

    The ZyTemp TN9 is a mass-produced thermal infrared (TIR) sensor that is normally used to build handheld non-contact thermometers. The measurement principle of the TN9 is similar to that of very costly meteorological pyrgeometers. The costs of the TN9 are less than 10. The output of the TN9 consists of observed thermal radiation, the temperature of the measurement instrument, and the emissivity used. The output is provided through a Serial Peripheral Interface protocol. The TN9 was combined with an Arduino board that registered data onto a USB memory stick. A solar cell, lead acid battery, housing and stand completed the meausrement set up. Total costs per set was in the order of 200 Land surface atmosphere interactions in mountainous areas, such as the Swiss Alps, are spatially heterogeneous. Shading, multi-layer cloud formation, and up- and downdrafts make for a very dynamic exchange of mass and energy along and across slopes. In order to better understand these exchanges, the Swiss Slope Experiment at La Fouly (SELF) has built a distributed sensing network consisting of eight micro-met stations and two flux towers in the "La Fouly" watershed in the upper Alps. To obtain a better handle on surface temperature, fifteen TIR sensing stations were installed that made observations during the 2010 Summer. Methods and results will be presented. Overview La Fouly watershed (source: http://eflum.epfl.ch/research/images/fouly_2.jpg)

  12. Contribution to knowledge of the bryophyte flora of the western Alps (Italy, France

    Directory of Open Access Journals (Sweden)

    Sabovljević M.

    2006-01-01

    Full Text Available The study is a contribution to knowledge of the bryophyte flora of the Alps. The huge bryophyte collection made during 1997 in the Western Alps is presented. A total of 152 bryophyte species were recorded, including 113 mosses and 39 hepatics.

  13. Germline FAS gene mutation in a case of ALPS and NLP Hodgkin lymphoma

    NARCIS (Netherlands)

    van den Berg, Anke; Maggio, Ewerton; Diepstra, A; de Jong, Doetje; van Krieken, J; Poppema, S

    2002-01-01

    FAS germline mutations have been associated with the development of autoimmune lymphoproliferative syndrome (ALPS). Occurrence of Hodgkin lymphoma (HL) has been reported in 2 families with ALPS. In both families an uncle of the index patient developed HL. A 15-year-old boy with autoommune

  14. Risk assessment of mountain infrastructure destabilization in the French Alps

    Science.gov (United States)

    Duvillard, Pierre-Allain; Ravanel, Ludovic; Deline, Philip

    2015-04-01

    In the current context of imbalance of geosystems in connection with the rising air temperature for several decades, high mountain environments are especially affected by the shrinkage of glaciers and the permafrost degradation which can trigger slope movements in the rock slopes (rockfall, rock avalanches) or in superficial deposits (slides, rock glacier rupture, thermokarst). These processes generate a risk of direct destabilization for high mountain infrastructure (huts, cable-cars...) in addition to indirect risks for people and infrastructure located on the path of moving rock masses. We here focus on the direct risk of infrastructure destabilization due to permafrost degradation and/or glacier shrinkage in the French Alps. To help preventing these risks, an inventory of all the infrastructure was carried out with a GIS using different data layers among which the Alpine Permafrost Index Map and inventories of the French Alps glaciers in 2006-2009, 1967-1971 and at the end of the Little Ice Age. 1769 infrastructures have been identified in areas likely characterized by permafrost and/or possibly affected by glacier shrinkage. An index of risk of destabilization has been built to identify and to rank infrastructure at risk. This theoretical risk index includes a characterization of hazards and a diagnosis of the vulnerability. The value of hazard is dependent on passive factors (topography, lithology, geomorphological context...) and on so-considered active factors (thermal state of the permafrost, and changing constraints on slopes related to glacier shrinkage). The diagnosis of vulnerability has meanwhile been established by combining the level of potential damage to the exposed elements with their operational and financial values. The combination of hazard and vulnerability determines a degree of risk of infrastructure destabilization (from low to very high). Field work and several inventories of infrastructure damages were used to validate it. The

  15. Cultures and politics in the present-day Alps

    Directory of Open Access Journals (Sweden)

    Bernard Debarbieux

    2009-03-01

    Full Text Available Plus que jamais, l’espace alpin est marqué par le déploiement de flux toujours plus variés, toujours plus puissants, et symétriquement par la multiplication d’initiatives destinées à conforter ou à régénérer l’idée de localité. Quelles spatialités et quelles territorialités travaillent les populations alpines aujourd’hui ? Quelles sont les figures contemporaines de la circulation et des flux, et les figures complémentaires de l’ancrage et de la refondation territoriale ? Voici les questions que cet essai se propose de développer. Ce texte reprend le contenu d’une conférence donnée dans le cadre de la célébration du centenaire de l’Institut de Géographie Alpine. Cette conférence, comme les autres données à cette occasion, avait adopté une forme libre dressant un bilan et des perspectives de la situation alpine. La trace écrite adoptée ici prend alors logiquement la forme d’un essai.More than ever before, the Alps are affected by increasingly varied and powerful flows and equally by the multiplication of initiatives designed to strengthen or regenerate the idea of “locality” (place. What spatialities and what territorialities activate the populations of the Alps today? What are the contemporary figures relating to circulation and flows and the complementary figures concerning spatial “anchoring” or fixity and new territorial foundations? These are the questions that this essay, proposes to develop. This text takes another look at the subject of a lecture given as part of celebrations to mark the centenary of the Institut de Géographie Alpine. This lecture, like the others given on this occasion, adopted a free format, presenting a report on the current situation in the Alps and prospects for the future. The written format adopted here logically takes the form of an essay. Readers looking for detailed illustrations and references are referred to three scientific articles published by the same

  16. Medical ethnobotany of the Albanian Alps in Kosovo

    Science.gov (United States)

    2012-01-01

    Background Ethnobotanical studies are crucial in South-Eastern Europe for fostering local development and also for investigating the dynamics of Traditional Environmental Knowledge (TEK) related to plants in one of the most crucial European hotspots for biocultural diversity. The current medico-ethnobotanical survey was conducted in rural alpine communities in Kosovo. The aims of the study were twofold: 1) to document the state of TEK of medicinal plants in these communities; 2) to compare these findings with that of similar field studies previously conducted among local populations inhabiting the Montenegrin and Albanian side of the same Alpine range. Methods Field research was conducted in 36 villages on the Kosovar side of the Albanian Alps. Snowball sampling techniques were used to recruit 91 elderly informants (≥ 50 years-old) for participation in semi-structured interviews and structured surveys regarding the use of the local flora for medicinal and food purposes. Standard ethnobotanical methods were employed and prior informed consent was obtained for all study participants. Results and Conclusion The uses of 98 plants species belonging to 39 families were recorded; the most quoted botanical families were Rosaceae, Asteraceae, and Lamiaceae. Mainly decoctions and infusions were quoted as folk medicinal preparations and the most common uses referred to gastrointestinal and respiratory disorders, as well as illnesses of the uro-genital system. Among the most uncommon medicinal taxa quoted by the informants, Carduus nutans L., Echinops bannaticus Rochel ex Schrad., and Orlaya grandiflora Hoffm. may merit phytochemical and phytopharmacological investigations. Comparison of the data with other ethnobotanical field studies recently conducted on the Albanian and Montenegrin sides of the same Alps has shown a remarkable link between the medical ethnobotany of Montenegrin and Kosovar side of the Albanian Alps. Moreover, folk uses of the most quoted wild medicinal

  17. Medical ethnobotany of the Albanian Alps in Kosovo.

    Science.gov (United States)

    Mustafa, Behxhet; Hajdari, Avni; Krasniqi, Feriz; Hoxha, Esat; Ademi, Hatixhe; Quave, Cassandra L; Pieroni, Andrea

    2012-01-28

    Ethnobotanical studies are crucial in South-Eastern Europe for fostering local development and also for investigating the dynamics of Traditional Environmental Knowledge (TEK) related to plants in one of the most crucial European hotspots for biocultural diversity. The current medico-ethnobotanical survey was conducted in rural alpine communities in Kosovo. The aims of the study were twofold: 1) to document the state of TEK of medicinal plants in these communities; 2) to compare these findings with that of similar field studies previously conducted among local populations inhabiting the Montenegrin and Albanian side of the same Alpine range. Field research was conducted in 36 villages on the Kosovar side of the Albanian Alps. Snowball sampling techniques were used to recruit 91 elderly informants (≥ 50 years-old) for participation in semi-structured interviews and structured surveys regarding the use of the local flora for medicinal and food purposes. Standard ethnobotanical methods were employed and prior informed consent was obtained for all study participants. The uses of 98 plants species belonging to 39 families were recorded; the most quoted botanical families were Rosaceae, Asteraceae, and Lamiaceae. Mainly decoctions and infusions were quoted as folk medicinal preparations and the most common uses referred to gastrointestinal and respiratory disorders, as well as illnesses of the uro-genital system. Among the most uncommon medicinal taxa quoted by the informants, Carduus nutans L., Echinops bannaticus Rochel ex Schrad., and Orlaya grandiflora Hoffm. may merit phytochemical and phytopharmacological investigations.Comparison of the data with other ethnobotanical field studies recently conducted on the Albanian and Montenegrin sides of the same Alps has shown a remarkable link between the medical ethnobotany of Montenegrin and Kosovar side of the Albanian Alps. Moreover, folk uses of the most quoted wild medicinal taxa recorded in Kosovo often include those

  18. Localized ductile deformation in the Rieserferner Pluton (Eastern Alps)

    Science.gov (United States)

    Ceccato, Alberto; Pennacchioni, Giorgio

    2017-04-01

    In the Rieserferner Pluton (Eastern Alps, 32±0.2 Ma, Romer et al., 2003) the post-magmatic cooling and exhumation stages were accompanied by a series of solid-state deformations including jointing, quartz veining, dyke emplacement, localized (cm-dm) ductile shearing and brittle-ductile faulting. The earliest stage of post-magmatic deformation includes the formation of pervasive steeply-dipping joints mainly arranged in two "conjugate" sets striking respectively E-W and NW-SE. These joints were extensively intruded by synkinematic aplite-pegmatite dykes and by quartz veins. Joints, veins and (locally) dikes were exploited as strike-slip ductile shear zones consistently with a WNW-ESE shortening. The mylonitized quartz veins are relatively coarse grained (mm-grain size) and show dominant dynamic recrystallization by grain boundary migration. A later set of joints is shallowly dipping E and is also commonly filled with quartz (and local epidote) veins. Ductile shearing of these vein-filled joints resulted in localized tonalite mylonites and quartz mylonites with a top-to-east kinematics. The quartz mylonites are fine grained (10-20 μm grain size) and resulted from dominant subgrain rotation recrystallization. The foliation of associated tonalite mylonites is marked by biotite+plagioclase+white mica+epidote±sphene±garnet. The "high-temperature" mylonites are crosscut by swarms of steeply-dipping fractures and faults striking N-S and showing a characteristic anastomosing-irregular pattern. These fractures are clustered in zones as large as 10 m and are associated with veins filled with calcite+white mica and with basic dykes (dated at 26 Ma: Steenken et al., 2000). Fluid-rock interactions along these fractures induced weakening and development of local low-temperature mylonites, where deformation mechanisms included pressure-solution and low-temperature plasticity of quartz. The orientation and kinematics of E-dipping mylonites and later low-temperature mylonites

  19. Crustal structure of the Eastern Alps and their foreland

    DEFF Research Database (Denmark)

    Grad, M.; Brückl, E.; Majdanski, M.

    2009-01-01

    ) and are also characterized by variations in apparent velocity and amplitude. The Moho reflections are usually strong and well correlated, while Pn arrivals are only fragmentarily recorded. Detailed 2-D forward modelling of all refracted, post-critical and reflected phases, identified in the correlation process...... of the area. Main features derived by 2-D modelling (low velocities beneath the accretionary wedge, high velocities in the lower crust of the Bohemian Massif, Moho topography) well correlate with the 3-D model. Furthermore, the 3-D model allows assessing the lateral extent of significant features alongside...... the CEL10/Alp04 profile. This area is affected by both collision and escape tectonics. The high-reflectivity zone in the middle crust is explained by intermediate to mafic intrusions, rather than by ductile extensional deformation as generally observed in the lower crust....

  20. Survey of microfungi in the Kleinwalsertal (Austrian alps).

    Science.gov (United States)

    Jensen, M; Ale-Agha, N; Brassmann, M

    2008-01-01

    During an excursion to the Alps near the German/Austrian border (Kleinwalsertal) in August 2007, we were able to collect more than 40 species of microfungi as parasites or saprophytes on different parts of wild plants. Some of them have been observed only rarely until now. Most of the species collected belong to the classes Ascomycotina, Basidiomycotina, and Deuteromycotina. For example: -Leptosphaeria jaceae Holm on Centaurea jacea L.; -Mycosphaerella equiseticola Bond.-Mont. on Equisetum telmateia Ehrh.; -Erysiphe cichoracearum DC. on Adenostyles alliariae (Gouan) Kerner, Centaurea phrygia, Cicerbita alpina (L.) Wallr.; -Podosphaera fusca (Fr.) U. Braun comb. nov. on Petasites paradoxus (Retz.) Baumg. and Senecio alpinus (L.) Scop.; -Pirottaea veneta Sacc. and Speg. on Lamium maculatum L.; -Coleosporium tussilaginis (Pers.) Kleb. on Adenostyles alliariae, Petasites paradoxus; -Puccinia mulgedii (West.) Syd. on Cicerbita alpinl; -Titleospora equiseti (Desm.) Vassil., -Stagonospora equiseti Fautr. on Equisetum telmateia, -Valdensia heterodoxa Peyronel on Cicerbita alpina.

  1. Morphological expression of active tectonics in the Southern Alps

    Science.gov (United States)

    Robl, Jörg; Heberer, Bianca; Neubauer, Franz; Hergarten, Stefan

    2015-04-01

    Evolving drainage pattern and corresponding metrics of the channels (e.g. normalized steepness index) are sensitive indicators for tectonic or climatic events punctuating the evolution of mountain belts and their associated foreland basins. The analysis of drainage systems and their characteristic properties represents a well-established approach to constrain the impact of tectonic and climatic drivers on mountainous landscapes in the recent past. The Southern Alps (SA) are one of the seismically most active zones in the periphery of northern Adria. Recent deformation is caused by the ongoing convergence of the Adriatic and European plate and is recorded by numerous earthquakes in the domain of the SA. Deformation in the SA is characterized by back-thrusting causing crustal thickening and should therefore result in uplift and topography formation. The vertical velocity field determined by GPS-data clearly indicates a belt of significant uplift in the south South alpine indenter between Lake Garda in the west and the Triglav in the east and strong subsidence of the foreland basin surrounding the Mediterranean Sea near Venice, although subsidence is often related to ongoing subduction of the Adriatic microplate underneath Appennines. Despite of these short term time series, timing, rates and drivers of alpine landscape evolution are not well constrained and the linkage between crustal deformation and topographic evolution of this highly active alpine segment remains unclear for the following reasons: (1) The eastern Southern Alps were heavily overprinted by the Pleistocene glaciations and tectonic signals in the alpine landscape are blurred. Only the transition zone to the southern foreland basin remained unaffected and allows an analysis of a glacially undisturbed topography. (2) The major part of this domain is covered by lithology (carbonatic rocks) which is unsuitable for low temperature geochronology and cosmogenic isotope dating so that exhumation and erosion

  2. The quest for an intermediate-scale accidental axion and further ALPs

    Energy Technology Data Exchange (ETDEWEB)

    Dias, A.G.; Nishi, C.C. [Univ. Federal do ABC - UFABC, Sao Paulo (Brazil); Machado, A.C.B. [Teorica-Univ. Estadual Paulista, Sao Paulo (Brazil). Instituto de Fisica; Ringwald, A. [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Vaudrevange, P. [Technische Univ. Muenchen, Garching (Germany). Excellence Cluster Universe

    2014-03-15

    The recent detection of the cosmic microwave background polarimeter experiment BICEP2 of tensor fluctuations in the B-mode power spectrum basically excludes all plausible axion models where its decay constant is above 10{sup 13} GeV. Moreover, there are strong theoretical, astrophysical, and cosmological motivations for models involving, in addition to the axion, also axion-like particles (ALPs), with decay constants in the intermediate scale range, between 10{sup 9} GeV and 10{sup 13} GeV. Here, we present a general analysis of models with an axion and further ALPs and derive bounds on the relative size of the axion and ALP photon (and electron) coupling. We discuss what we can learn from measurements of the axion and ALP photon couplings about the fundamental parameters of the underlying ultraviolet completion of the theory. For the latter we consider extensions of the Standard Model in which the axion and the ALP(s) appear as pseudo Nambu-Goldstone bosons from the breaking of global chiral U(1) (Peccei-Quinn (PQ)) symmetries, occuring accidentally as low energy remnants from exact discrete symmetries. In such models, the axion and the further ALP are protected from disastrous explicit symmetry breaking effects due to Planck-scale suppressed operators. The scenarios considered exploit heavy right handed neutrinos getting their mass via PQ symmetry breaking and thus explain the small mass of the active neutrinos via a seesaw relation between the electroweak and an intermediate PQ symmetry breaking scale. We show some models that can accommodate simultaneously an axion dark matter candidate, an ALP explaining the anomalous transparency of the universe for γ-rays, and an ALP explaining the recently reported 3.55 keV gamma line from galaxies and clusters of galaxies, if the respective decay constants are of intermediate scale.

  3. The quest for an intermediate-scale accidental axion and further ALPs

    International Nuclear Information System (INIS)

    Dias, A.G.; Nishi, C.C.; Machado, A.C.B.; Vaudrevange, P.

    2014-03-01

    The recent detection of the cosmic microwave background polarimeter experiment BICEP2 of tensor fluctuations in the B-mode power spectrum basically excludes all plausible axion models where its decay constant is above 10 13 GeV. Moreover, there are strong theoretical, astrophysical, and cosmological motivations for models involving, in addition to the axion, also axion-like particles (ALPs), with decay constants in the intermediate scale range, between 10 9 GeV and 10 13 GeV. Here, we present a general analysis of models with an axion and further ALPs and derive bounds on the relative size of the axion and ALP photon (and electron) coupling. We discuss what we can learn from measurements of the axion and ALP photon couplings about the fundamental parameters of the underlying ultraviolet completion of the theory. For the latter we consider extensions of the Standard Model in which the axion and the ALP(s) appear as pseudo Nambu-Goldstone bosons from the breaking of global chiral U(1) (Peccei-Quinn (PQ)) symmetries, occuring accidentally as low energy remnants from exact discrete symmetries. In such models, the axion and the further ALP are protected from disastrous explicit symmetry breaking effects due to Planck-scale suppressed operators. The scenarios considered exploit heavy right handed neutrinos getting their mass via PQ symmetry breaking and thus explain the small mass of the active neutrinos via a seesaw relation between the electroweak and an intermediate PQ symmetry breaking scale. We show some models that can accommodate simultaneously an axion dark matter candidate, an ALP explaining the anomalous transparency of the universe for γ-rays, and an ALP explaining the recently reported 3.55 keV gamma line from galaxies and clusters of galaxies, if the respective decay constants are of intermediate scale.

  4. [Palaeostructures of vegetation at the upper limit of forests in the inner French Alps].

    Science.gov (United States)

    Muller, Serge D; Nakagawa, Takeshi; de Beaulieu, Jacques-Louis; Court-Picon, Mona; Fauquette, Séverine; Genries, Aurélie

    2006-07-01

    The comparison of six pollen diagrams from French Alps allows us to reconstruct the past changes of vegetation structure at the upper limit of Subalpine range. Dense populations of Pinus cembra developed between 6500 and 2400 cal. BP, both in the southern Alps and the northern ones. Southern Alps seem however to be characterised by higher altitudinal limits, as shown by the past development of fir forests at 2080 m a.s.l. in the Ubaye valley. This study highlights the importance of taking in account local parameters in regional or continental reviews.

  5. Dendroclimatic trend and glacial fluctuations in the Central Italian Alps

    Science.gov (United States)

    Pelfini, M.; Santilli, M.; D Agata, C.; Diolaiuti, G.; Smiraglia, C.

    2003-04-01

    In the Alpine environment, one of the main limiting factors for tree growth is the thermal conditions of the vegetative season. The conifers at high altitude, if not subject to others disturbs, such as geomorphological processes or biological interferences, undergo a development, from which the width of annual rings depends. Five chronologies few centuries long, obtained for the species Larix decidua Mill. and Pinus cembra L. from different valleys of the Central Italian Alps (Alpisella, Valfurva, Gavia and Solda) in proximity of timberline (2000-2550 m of altitude), were analysed and their climatic signal gained; this last one was then related to the recent glacial fluctuations. The chronologies are the averages of many dendrochronological indicized curves obtained from dominant trees with regular growth and extended from 13th-17th century up to the present. The time intervals of the chronologies are the following ones: Pinus cembra: 1752-1999 for Valfurva; 1607-1999 for Gavia; 1593-1999 for Val Solda. With regard to Larix decidua: 1252-1998 for Val Solda; 1784-2001 for Alpisella. The good correspondence between the various chronologies allows to consider them representative of the climatic regional signal. In order to evidence climatic evolution, linear trends based on running mean with period of 11 years have been constructed. Those curves have been compared between them and then overlapped and mediated in order to obtain a climatic signal of regional value that excludes eventual local anomalies. Finally, the growth variations in the chronologies have been compared to known alpine climatic variations and glacial fluctuations. In particular time-distance curves (curves of cumulated frontal variations) of some glaciers from the Ortles-Cevedale Group were utilized. The periods of tree rings growth rate reduction appear well correlated to glacial advancing phases of the Little Ice Age and of the following phases. In particular, growth rate reductions are observable

  6. Snow chemistry of high altitude glaciers in the French Alps

    Science.gov (United States)

    Maupetit, François; Delmas, Robert J.

    1994-09-01

    Snow samples were collected as snowcores in the accumulation zone of four high altitude glaciers (2980 3540m.a.s.l.) from each of the 4 highest mountain areas of the French Alps, during 3 consecutive years: 1989, 1990 and 1991. Sampling was performed in spring (˜ May), before the onset of late spring summer percolation. The accumulated snow therefore reflects winter and spring conditions. A complementary sampling of fresh-snow was performed on an event basis, on one of the studied glaciers, in 1990 and 1991. All samples were analysed for major ions (but also for total formate and acetate in fresh-snow samples) using ion chromatography. The acidity-alkalinity was accurately determined with a titration technique. The ion balance of alpine snow has been achieved from those analyses. High alpine snow is slightly acid (H+ 3 20 μeq 11), but is episodically affected by alkaline saharan dust events. The different sources (pollution, seasalt and soil dust) affecting the impurity content of snow were identified using principal component analysis. The measured free acidity, mainly from anthropogenic origin, originates from nitric acid scavenging while sulfuric acidity is partially neutralized by atmospheric ammonia and by alkaline soil dust derived species, the contribution of hydrochloric acid being negligible. All ions exhibit higher concentrations in spring than in winter snow, indicating most likely the influence of increased vertical transport from the lower troposphere at this time. The transport of saharan dust is described through three major events reaching the Alps during March 1990 and 1991. Very high concentrations of Ca2+ and HCO3 were measured in corresponding samples, indicating that the solubilisation of CaCO3 represents the major influence of saharan dust on the impurity content of alpine snow, shifting the pH from acid towards alkaline values. Chemical analysis suggests that during their transport, mineral alkaline particles can react through acid

  7. Modeling Sustainable Bioenergy Feedstock Production in the Alps

    Science.gov (United States)

    Kraxner, Florian; Leduc, Sylvain; Kindermann, Georg; Fuss, Sabine; Pietsch, Stephan; Lakyda, Ivan; Serrano Leon, Hernan; Shchepashchenko, Dmitry; Shvidenko, Anatoly

    2016-04-01

    Sustainability of bioenergy is often indicated by the neutrality of emissions at the conversion site while the feedstock production site is assumed to be carbon neutral. Recent research shows that sustainability of bioenergy systems starts with feedstock management. Even if sustainable forest management is applied, different management types can impact ecosystem services substantially. This study examines different sustainable forest management systems together with an optimal planning of green-field bioenergy plants in the Alps. Two models - the biophysical global forest model (G4M) and a techno-economic engineering model for optimizing renewable energy systems (BeWhere) are implemented. G4M is applied in a forward looking manner in order to provide information on the forest under different management scenarios: (1) managing the forest for maximizing the carbon sequestration; or (2) managing the forest for maximizing the harvestable wood amount for bioenergy production. The results from the forest modelling are then picked up by the engineering model BeWhere, which optimizes the bioenergy production in terms of energy demand (power and heat demand by population) and supply (wood harvesting potentials), feedstock harvesting and transport costs, the location and capacity of the bioenergy plant as well as the energy distribution logistics with respect to heat and electricity (e.g. considering existing grids for electricity or district heating etc.). First results highlight the importance of considering ecosystem services under different scenarios and in a geographically explicit manner. While aiming at producing the same amount of bioenergy under both forest management scenarios, it turns out that in scenario (1) a substantially larger area (distributed across the Alps) will need to be used for producing (and harvesting) the necessary amount of feedstock than under scenario (2). This result clearly shows that scenario (2) has to be seen as an "intensification

  8. Epigondolella abneptis and E. spatulata in the Lower Norian in the central Kamnik Alps, Slovenia

    Directory of Open Access Journals (Sweden)

    Anton Ramovš

    1994-12-01

    Full Text Available Epigondolella abneptis (Huckriede, 1958 and E. spatulata (Hayashi, 1968from the Lower Norian (Upper Triassic deeper marine micritic limestones with chert nodules and lenses in the locality Sleme, central Kamnik Alps, are presented.

  9. Air Force ALP AEF Initiative Wing-Level Cluster Development and Demonstration

    National Research Council Canada - National Science Library

    Stute, Nicholas

    2001-01-01

    The purpose of this document is to describe the results for the Air Force ALP AEF Initiative Wing-Level Cluster Development and Demonstration task jointly sponsored by the Logistics Readiness Branch...

  10. La recherche sur les montagnes entre Alpes et monde : regards rétrospectifs

    Directory of Open Access Journals (Sweden)

    Thomas Scheurer

    2009-03-01

    Full Text Available L’expression « recherche alpine », on le constatera au fil de ce volume, reste bien incertaine. La première lecture suscite une interrogation : s’agit-il d’une recherche menée sur les Alpes ou dans les Alpes ? Ou pour les Alpes ? C’est-à-dire répondant à une demande émanant d’« acteurs alpins » ? On observera aisément que la recherche sur des terrains alpins et selon des thématiques et des questionnements soulevés par les sociétés alpines est menée préférentiellement au sein des Alpes. Il n’y...

  11. Detecting an infrared photon within an hour. Transition-edge detector at ALPS-II

    Energy Technology Data Exchange (ETDEWEB)

    Dreyling-Eschweiler, Jan [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Hamburg Univ. (Germany). Inst. fuer Experimentalphysik; Horns, Dieter [Hamburg Univ. (Germany). Inst. fuer Experimentalphysik; Collaboration: ALPS-II collaboration

    2013-09-15

    An essential design requirement of the ALPS-II experiment is the efficient detection of single photons with a very low instrumental background of 10 {mu}Hz. In 2011 the ALPS collaboration started to set up a TES detector (Transition-Edge Sensor) for ALPS-II, the second phase of the experiment. Since mid of 2013 the setup is ready for characterization in the ALPS laboratory: an ADR cryostat (Adiabatic Demagnetization Refrigerator) as millikelvin environment, a low noise SQUID (Superconducting Quantum Interference Device) with electronics for read-out and a fiber-coupled high-efficient TES for near-infrared photons as sensor. First measurements have shown a good discrimination between noise and 1064 nm signals.

  12. Photosynthetic temperature adaptation of Pinus cembra within the timberline ecotone of the Central Austrian Alps

    OpenAIRE

    Wieser, Gerhard; Oberhuber, Walter; Walder, Lisa; Spieler, Daniela; Gruber, Andreas

    2010-01-01

    Temperature is suggested to determine the upper limit of tree life. Therefore, future climate warming may be of importance for tree distribution within the European Alps, where low temperatures limit carbon metabolism.

  13. Detecting an infrared photon within an hour. Transition-edge detector at ALPS-II

    International Nuclear Information System (INIS)

    Dreyling-Eschweiler, Jan; Hamburg Univ.; Horns, Dieter

    2013-09-01

    An essential design requirement of the ALPS-II experiment is the efficient detection of single photons with a very low instrumental background of 10 μHz. In 2011 the ALPS collaboration started to set up a TES detector (Transition-Edge Sensor) for ALPS-II, the second phase of the experiment. Since mid of 2013 the setup is ready for characterization in the ALPS laboratory: an ADR cryostat (Adiabatic Demagnetization Refrigerator) as millikelvin environment, a low noise SQUID (Superconducting Quantum Interference Device) with electronics for read-out and a fiber-coupled high-efficient TES for near-infrared photons as sensor. First measurements have shown a good discrimination between noise and 1064 nm signals.

  14. The Advanced Locking Plate System (ALPS): a retrospective evaluation in 71 small animal patients.

    Science.gov (United States)

    Guerrero, Tomás G; Kalchofner, Karin; Scherrer, Nicole; Kircher, Patrick

    2014-02-01

    To evaluate use of the Advanced Locking Plate System (ALPS) in dogs and cats and report outcome. Retrospective case series. Dogs (n = 29) and cats (n = 42). The medical records (April 2007-April 2010) of dogs and cats treated with ALPS were reviewed evaluated. Data retrieved included signalment, indication for surgery, complications, and outcome. ALPS was used for 54 fractures, 12 tarsal or carpal ligament injuries and in 6 cases, to prevent or treat fractures during total hip replacement. Complications needing revision surgery occurred in 4 cases (5.5%): fixation failure was identified in 3 (2 fracture-fixations, 1 pancarpal arthrodesis), and a fracture occurred through a screw hole. The most common complication after tarsal arthrodesis was suture dehiscence. All cases had healed by study end. ALPS offers a reliable alternative for fracture treatment and some other orthopedic conditions in small animals. © Copyright 2014 by The American College of Veterinary Surgeons.

  15. Advanced Large Area Plastic Scintillator Project (ALPS): Final Report

    Energy Technology Data Exchange (ETDEWEB)

    Jordan, David V.; Reeder, Paul L.; Todd, Lindsay C.; Warren, Glen A.; McCormick, Kathleen R.; Stephens, Daniel L.; Geelhood, Bruce D.; Alzheimer, James M.; Crowell, Shannon L.; Sliger, William A.

    2008-02-05

    The advanced Large-Area Plastic Scintillator (ALPS) Project at Pacific Northwest National Laboratory investigated possible technological avenues for substantially advancing the state-of-the-art in gamma-ray detection via large-area plastic scintillators. The three predominant themes of these investigations comprised the following: * Maximizing light collection efficiency from a single large-area sheet of plastic scintillator, and optimizing hardware event trigger definition to retain detection efficiency while exploiting the power of coincidence to suppress single-PMT "dark current" background; * Utilizing anti-Compton vetoing and supplementary spectral information from a co-located secondary, or "Back" detector, to both (1) minimize Compton background in the low-energy portion of the "Front" scintillator's pulse-height spectrum, and (2) sharpen the statistical accuracy of the front detector's low-energy response prediction as impelmented in suitable energy-windowing algorithms; and * Investigating alternative materials to enhance the intrinsic gamma-ray detection efficiency of plastic-based sensors.

  16. CLIM-RUN: Tourism cas study over the French Alps

    Science.gov (United States)

    Dubois, C.

    2012-04-01

    Climate information for societal use has becoming a major challenge for tourism management and adaptation in a context of strong climate variability and change. Within the CLIMRUN EU FP7, a case study on summer tourism in the French Alps has been identify. I will introduce the bottom-up approach use in the project where stakeholders and local users meet with climate experts. From those meetings, they thus identify the climate dependence and information which impact their summer activities over this region. All the activities are located in a mountainous region where outdoor leisure is the main economic driver of the region. It has emerged that the climate requirements are as well on past as on future climate information. On one side, the past climate parameters are found to be an invaluable information to evaluate the climate dependence of the different activities. A better knowledge as well as a growing interest in climate variability has been express to quantify the climate dependence on their activities. On the other side, the future climate information requested mainly on seasonal to decadal timescale. A particular interest has been express on the snow cover at the end of the winter season, evolution of heavy precipitations, heatwave, air temperatures and well as the water temperature of the mountainous lakes. Those climate variables are used to create comfort index under climate change. All those targeted climate information are based on on-going projects as well as future model development.

  17. Status of ELI-ALPS implementation (Conference Presentation)

    Science.gov (United States)

    Osvay, Karoly; Charalambidis, Dimitris; Antici, Patrizio; Dombi, Péter; Fulop, Lajos J.; Lepine, Franck; Mészáros, Gergo; Sansone, Giuseppe; Varju, Katalin G.

    2017-05-01

    The major research equipment of the Attosecond Light Pulse Source of the Extreme Light Infrastructure (ELI-ALPS) are driven by laser pulses of few cycle duration operating in the 100 W average power regime. The peak power and the repetition rate span from 1 TW at 100 kHz up to PW at 10 Hz. The systems are designed for stable and reliable operation, yet to deliver pulses with unique parameters, especially with unmatched fluxes and extreme bandwidths. This exceptional performance will enable the generation of secondary sources with exceptional characteristics, including light sources ranging from the THz to the X-ray spectral ranges, and particle sources. The experimental activities in the building complex to be inaugurated early 2017 will start with the installation of the two 100 kHz repetition rate, CEP stabilized lasers in May 2017. The MIR laser produces 0.15mJ, shorter than 4-optical-cylce pulses tunable between 2.5-3.9 µm. The first stage of the HR laser will provide pulses around 1 µm with 1 mJ energy and pulse duration less than 6.2 fs. The systems will be optically synchronized to each other with a temporal jitter below 1 fs. Along with the installation of the lasers, we will also start the assembly of the high harmonic beamlines and the THz laboratory, as well as nanoplasmonic experiments. The XUV bursts of light with attosecond duration are expected to be generated by the end of 2017.

  18. Statistically extrapolated nowcasting of summertime precipitation over the Eastern Alps

    Science.gov (United States)

    Chen, Min; Bica, Benedikt; Tüchler, Lukas; Kann, Alexander; Wang, Yong

    2017-07-01

    This paper presents a new multiple linear regression (MLR) approach to updating the hourly, extrapolated precipitation forecasts generated by the INCA (Integrated Nowcasting through Comprehensive Analysis) system for the Eastern Alps. The generalized form of the model approximates the updated precipitation forecast as a linear response to combinations of predictors selected through a backward elimination algorithm from a pool of predictors. The predictors comprise the raw output of the extrapolated precipitation forecast, the latest radar observations, the convective analysis, and the precipitation analysis. For every MLR model, bias and distribution correction procedures are designed to further correct the systematic regression errors. Applications of the MLR models to a verification dataset containing two months of qualified samples, and to one-month gridded data, are performed and evaluated. Generally, MLR yields slight, but definite, improvements in the intensity accuracy of forecasts during the late evening to morning period, and significantly improves the forecasts for large thresholds. The structure-amplitude-location scores, used to evaluate the performance of the MLR approach, based on its simulation of morphological features, indicate that MLR typically reduces the overestimation of amplitudes and generates similar horizontal structures in precipitation patterns and slightly degraded location forecasts, when compared with the extrapolated nowcasting.

  19. Fog Chemistry at Different Altitudes in the Swiss Alps

    Science.gov (United States)

    Michna, P.; Eugster, W.; Wanner, H.

    2010-07-01

    During two extended summer seasons in 2006 and 2007, we installed two battery driven versions of the Caltech active strand cloud water collector (MiniCASCC) at the Niesen mountain in the northern Swiss Alps. Along, we measured air temperature, relative humidity, wind, and visibility. During these two field operation phases we gained weekly samples of fogwater, where we analysed the major anions and cations, and the stable water isotopes δD and δ18O. The fog collectors were installed at an altitude of 2300 and 1600 m asl to resolve altitudinal differences in fog chemistry. We found a large variability between the events, but no clear altitudinal gradient. At both sites, the most important ions were nitrate, ammonium, and sulphate. Higher concentrations occured preferably in late spring (start of sampling period) and in autumn (end of sampling). Compared to previous studies at lower elevations in the Swiss Plateau during wintertime, our measurements showed considerable lower ion loads in the fogwater. The combination of these results suggest that lowest ion loads are found in convective clouds with a short lifetime and that the highest ion loads occur during radiation fog events at lower elevations.

  20. Clinoenstatite in alpe arami peridotite: additional evidence of very high pressure

    Science.gov (United States)

    Bozhilov; Green; Dobrzhinetskaya

    1999-04-02

    Observations by transmission electron microscopy show that lamellae of clinoenstatite are present in diopside grains of the Alpe Arami garnet lherzolite of the Swiss Alps. The simplest interpretation of the orientation, crystallography, and microstructures of the lamellae and the phase relationships in this system is that the lamellae originally exsolved as the high-pressure C-centered form of clinoenstatite. These results imply that the rocks were exhumed from a minimum depth of 250 kilometers before or during continental collision.

  1. Present status and distribution of the Lynx in the Swiss Alps

    Directory of Open Access Journals (Sweden)

    Anja Molinari-Jobin

    2001-12-01

    Full Text Available Abstract To evaluate the population trend of lynx in the Swiss Alps, we analysed the spatial and numerical development of signs of presence found from 1995 to 1999 and compared them with previous years. Three sources of information on the presence of lynx are available: (1 reports of lynx killed or found dead; (2 records of livestock killed by lynx; (3 records of wild prey remains, tracks, scats, sightings, and vocalisations. We distinguished three levels of reliability: Quality 1 represent the hard facts, e.g. all reports of lynx killed or found dead, photographs of lynx as well as young orphaned lynx caught in the wild and taken into captivity. Quality 2 include all records of livestock killed, wild prey remains, tracks and scats reported by people who have attended special courses, e.g. mainly game wardens. Quality 3 are all wild prey remains and tracks reported by the general public as well as all sightings, scats and vocalisations, e.g. signs that cannot be verified. More than 1600 signs of presence were recorded in the Swiss Alps in this 5-year-period. A high number of quality 1 and 2 records showed that (1 the lynx population in the north-western Swiss Alps increased from 1994 to 1999, that (2 there is a moderate presence of the species in the central and south-western parts and (3 none or hardly any lynx are found in the eastern Alps of Switzerland. Based on a radio-telemetry study and the number of quality 2 data, we were able to estimate the number of lynx in the Swiss Alps at 70 individuals. To counterpart the uneven distribution of lynx in Switzerland, lynx are being translocated from the north-western Alps to the eastern Swiss Alps, as the expansion of the Swiss lynx population is crucial for the conservation of the lynx in the whole Alps.

  2. La géologie du Valle del Bitto et la tectonique des Alpes Lombardes

    NARCIS (Netherlands)

    Tromp, S.W.

    1931-01-01

    Parmi toutes les zones non encore étudiées des Alpes Bergamasques, ce sont surtout les Valle del Bitto di Albaredo e di Gerola qui m'ont attiré, attendu qu'ils présentent une région des Alpes Bergamasques encore complètement négligée jusqu'à présent, à savoir: la zone cristallophyllienne de la

  3. Glaciation's topographic control on Holocene erosion at the eastern edge of the Alps

    OpenAIRE

    J. L. Dixon; J. L. Dixon; F. von Blanckenburg; F. von Blanckenburg; K. Stüwe; M. Christl

    2016-01-01

    What is the influence of glacial processes in driving erosion and uplift across the European Alps? It has largely been argued that repeated erosion and glaciation sustain isostatic uplift and topography in a decaying orogen. But some parts of the Alps may still be actively uplifting via deep lithospheric processes. We add insight to this debate by isolating the role of post-glacial topographic forcing on erosion rates. To do this, we quantify the topographic signature of pas...

  4. Possible room temperature ferromagnetism in Ca-doped AlP: First-principles study

    International Nuclear Information System (INIS)

    Zhang, Yong

    2013-01-01

    Based on first-principle calculations, we have studied the electronic and magnetic properties of AlP with aluminium vacancy and calcium doping. It was found that while Al vacancy and Ca impurity themselves are nonmagnetic, they generate holes residing in P 2p orbitals that lead to magnetic moments in AlP. The coupling between two Al vacancies in AlP are always antiferromagnetic because of half-filled t 2 level. However, the coupling becomes ferromagnetic with large magnetic energy when vacancies are replaced by nonmagnetic Ca atoms. Moreover, the presence of Ca dopants reduces the formation energy of Al vacancy. These results suggest that Ca-doped AlP is a promising room temperature ferromagnetic semiconductor free of magnetic precipitates, and it may find applications in the field of spintronics. - Highlights: • “d 0 ferromagnetism” has been found in Ca-doped AlP. • Unpaired t 2 state of P atoms has an important impact on magnetic properties. • Room temperature T C may be expected in Ca-doped AlP

  5. La Directísima en los Alpes, Austria

    Directory of Open Access Journals (Sweden)

    Schmidt, Wilhelm

    1979-06-01

    Full Text Available This article deals with the construction procesa of the «straight» expressway through the Tauern AIps, where several engineering works deserve special mention: — The Tauern Tunnel, 6.4 km In length. — The Katschberg Tunnel, 5.4 km In length. — The Eben-Pongan cloverleaf. — The Liesertal stretch, 75 per 100 of its length being tunnels and viaducts. The most important of this Is the Tauern Tunnel where, owing to the serious problems encountered in the brittle character of the soil, the Austrian tunnel excavation process was used, this method consisting in tensing the mountain soil in order to be able to counteract the high pressures occurring. This tunnel has a 600 m long, 11 m diameter ventilation shaft, the largest of its kind in the World.

    Se trata, en este artículo, del proceso de construcción de la Autopista de Tauern, La Directísima, en los Alpes, en la que destacan varias obras: — Túnel de Tauern, de 6,4 km de longitud. — Túnel de Katschberg, de 5,4 km de longitud. — Punto de enlace Eben-Pongau. — Tramo de Liesertal, realizado en un 75 por 100 mediante viaductos y túneles. La obra más importante es el túnel de Tauern donde, debido a los grandes problemas surgidos por la naturaleza quebradiza del terreno, hubo de emplearse un método austríaco de perforación de túneles consistente en poner en tensión la montaña para, de esta manera, contrarrestar las altas presiones que se producen. Este túnel tiene un pozo de ventilación de 600 m de longitud y 11 m de diámetro de perforación. Es el pozo vertical más grande del mundo.

  6. Eclogitic metatrondhjemites from metaophiolites of the Western Alps

    Science.gov (United States)

    Martin, Silvana; Tartarotti, Paola; Meyzen, Chrstine; Benciolini, Luca; Toffolo, Luca

    2016-04-01

    Eclogitic metatrondhjemites from metaophiolites of the Western Alps Martin S.**, Tartarotti P.*, Meyzen C. **, Benciolini L.***, Toffolo L. ** *Dipartimento di Scienze della Terra, Università degli Studi di Milano ** Dipartimento di Geoscienze, Università di Padova *** Dipartimento di Chimica, Fisica e Ambiente, Università di Udine In the Urtier valley (southern Aosta Valley, Italy), the Piemonte metaophiolites mainly consist of serpentinized peridotites including pods and boudinaged layers of Fe-metagabbro and trondhjemite transposed in the main eclogitic foliation. The contact between serpentinized peridotites and Fe-metagabbro/trondhjemite is locally lined by chloriteschist and rodingite. The high pressure parageneses in the Fe-metagabbro are omphacite-garnet-rutile-glaucophane-phengite, and in the metatrondhjemite plagioclase-quartz-phengite-clinozoisite-epidote-garnet, respectively. Bulk-rock major and trace elements in addition to O isotope analyses were performed in both rock types. Fe-metagabbros are characterized by MgO wt% ranging between 6.11 and 9.63%, ∑REE= 20-101 ppm, (La/Yb)N = 0.22-0.91; trondhjemites have SiO2 43%, Al2O3 ranging between 21 and 24%, CaO ranging between 17 and 20%, ∑REE = 172 - 272 ppm, (La/Yb)N ranging between 7.78 and 13.70. The δ18O is 5.9 ‰ in a Fe-metagabbro sample and 7.4 ‰ in a trondhjemite sample, suggesting that these rocks have been affected by a weak oceanic low temperature alteration. The high CaO content may indicate a metasomatic process which could have occurred during the oceanic stage or at high pressure conditions.

  7. Sensitivity and Specificity of Plasma ALT, ALP, and Bile Acids for Hepatitis in Labrador Retrievers.

    Science.gov (United States)

    Dirksen, K; Burgener, I A; Rothuizen, J; van den Ingh, T S G A M; Penning, L C; Spee, B; Fieten, H

    2017-07-01

    Biochemical indicators for diagnosing liver disease are plasma alanine aminotransferase activity (ALT), alkaline phosphatase activity (ALP), and bile acid concentration (BA). To determine the sensitivity and specificity of ALT, ALP, and BA for detecting primary hepatitis (PH) in clinically healthy Labrador retrievers and investigate whether ALT and ALP can discriminate between dogs with PH and nonspecific reactive hepatitis (RH). 191 clinically healthy and 51 clinically ill Labrador retrievers with hepatic histopathology. Retrospective study. Medical records were reviewed for ALT, ALP, preprandial BA, liver histopathology, and hepatic copper concentrations. In 64% (122/191) of the clinically healthy Labrador retrievers, hepatic histology revealed inflammatory infiltrates. This frequency might be biased because part of them was included as first-line relatives of dogs with copper-associated hepatitis. Sensitivity of ALT, ALP, and BA in this population for detecting acute hepatitis was 45, 15, and 15%, respectively. For chronic hepatitis, sensitivity was 71, 35, and 13%, respectively. Specificity of ALT, ALP, and BA was >90% for AH, CH, and RH. When increased liver enzymes were present, median ALT was significantly higher in PH cases (312 U/L, range 38-1,369) compared to RH cases (91 U/L, range 39-139) (P ALT, ALP, and BA for detecting acute and chronic hepatitis in this population was low. More sensitive biomarkers are needed for early detection of liver disease in apparent clinically healthy dogs. Copyright © 2017 The Authors. Journal of Veterinary Internal Medicine published by Wiley Periodicals, Inc. on behalf of the American College of Veterinary Internal Medicine.

  8. Nuclear translocation of the cytoskeleton-associated protein, smALP, upon induction of skeletal muscle differentiation

    International Nuclear Information System (INIS)

    Cambier, Linda; Pomies, Pascal

    2011-01-01

    Highlights: → The cytoskeleton-associated protein, smALP, is expressed in differentiated skeletal muscle. → smALP is translocated from the cytoplasm to the nucleus of C2C12 myoblasts upon induction of myogenesis. → The differentiation-dependent nuclear translocation of smALP occurs in parallel with the nuclear accumulation of myogenin. → The LIM domain of smALP is essential for the nuclear accumulation of the protein. → smALP might act in the nucleus to control some critical aspect of the muscle differentiation process. -- Abstract: The skALP isoform has been shown to play a critical role in actin organization and anchorage within the Z-discs of skeletal muscles, but no data is available on the function of the smALP isoform in skeletal muscle cells. Here, we show that upon induction of differentiation a nuclear translocation of smALP from the cytoplasm to the nucleus of C2C12 myoblasts, concomitant to an up-regulation of the protein expression, occurs in parallel with the nuclear accumulation of myogenin. Moreover, we demonstrate that the LIM domain of smALP is essential for the nuclear translocation of the protein.

  9. Younger Dryas equilibrium line altitudes and precipitation patterns in the Alps

    Science.gov (United States)

    Kerschner, Hanns; Moran, Andrew; Ivy-Ochs, Susan

    2016-04-01

    Moraine systems of the "Egesen Stadial" are widespread and easily identifiable features in the Alps. Absolute dating with terrestrial cosmogenic radionuclides shows that the maximum extent was reached during the early Younger Dryas (YD), probably as a reaction to the intense climatic downturn subsequent to Lateglacial Interstadial. In recent years, several new studies and the availability of high-quality laser-scan hillshades and orthophotos allowed a significant extension of the database of YD glaciers as "palaeoprecipitation gauges" to large hitherto unmapped regions in the Austrian and Swiss Alps. The equilibrium line altitude (ELA) of the glaciers and its lowering relative to the Little Ice Age ELA (dELA) shows a distinct and systematic spatial pattern. Along the northern slope of the Alps, dELAs are usually large (around 400 m and perhaps even more), while dELAs range around 200 m in the well sheltered areas of the central Alps, e.g. in the Engadine and in western Tyrol. Both stochastic glacier-climate models (e.g. Ohmura et al. 1992) and the heat- and mass balance equation (Kuhn 1981) allow the reconstruction of precipitation change under the assumption of a spatially constant summer temperature depression, which in turn can be estimated from biological proxies. This allows to draw the spatial pattern of precipitation change with considerable detail. Precipitation change is clearly controlled by the local relief like high mountain chains, deeply incised and long valleys and mountain passes. Generally the contrast between the northern fringe of the Alps and the interior was more pronounced than today. Climate in the Northern and and Northwestern Alps was rather wet with precipitation totals eventually exceeding modern annual sums. The central Alps received 20 - 30% less precipitation than today, mainly due to reduced winter precipitation. In the southern Alps, still scarce spatial information points to precipitation sums which were approximately similar to

  10. Adjacent Lone Pair (ALP) Effect: A Computational Approach for Its Origin.

    Science.gov (United States)

    Zhang, Huaiyu; Wu, Wei; Ahmed, Basil M; Mezei, Gellert; Mo, Yirong

    2016-05-23

    The adjacent lone pair (ALP) effect is an experimental phenomenon in certain nitrogenous heterocyclic systems exhibiting the preference of the products with lone pairs separated over other isomers with lone pairs adjacent. A theoretical elucidation of the ALP effect requires the decomposition of intramolecular energy terms and the isolation of lone pair-lone pair interactions. Here we used the block-localized wavefunction (BLW) method within the ab initio valence bond (VB) theory to derive the strictly localized orbitals which are used to accommodate one-atom centered lone pairs and two-atom centered σ or π bonds. As such, interactions among electron pairs can be directly derived. Two-electron integrals between adjacent lone pairs do not support the view that the lone pair-lone pair repulsion is responsible for the ALP effect. Instead, the disabling of π conjugation greatly diminishes the ALP effect, indicating that the reduction of π conjugation in deprotonated forms with two σ lone pairs adjacent is one of the major causes for the ALP effect. Further electrostatic potential analysis and intramolecular energy decomposition confirm that the other key factor is the favorable electrostatic attraction within the isomers with lone pairs separated. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  11. Si3 AlP: A New Promising Material for Solar Cell Absorber

    Science.gov (United States)

    Yang, Jihui; Zhai, Yingteng; Liu, Hengrui; Xiang, Hongjun; Gong, Xingao; Wei, Suhuai

    2014-03-01

    First-principles calculations are performed to study the structural and optoelectronic properties of the newly synthesized nonisovalent and lattice-matched (Si2)0.6(AlP)0.4 alloy [T. Watkins et al., J. Am. Chem. Soc. 2011, 133, 16212.] The most stable structure of Si3AlP is a superlattice along the direction with separated AlP and Si layers, which has a similar optical absorption spectrum to silicon. The ordered C1c1-Si3AlP is found to be the most stable one among all the structures with -AlPSi3- motifs, in agreement with the experimental suggestions. We predict that C1c1-Si3AlP has good optical properties, i.e., it has a larger fundamental band gap and a smaller direct band gap than Si, thus it has much higher absorption in the visible light region, making it a promising candidate for improving the performance of the existing Si-based solar cells.

  12. Hydrological and meteorological aspects of floods in the Alps: an overview

    Directory of Open Access Journals (Sweden)

    Baldassare Bacchi

    2003-01-01

    Full Text Available This introductory paper presents and summarises recent research on meteorological and hydrological aspects of floods in the Alps. The research activities were part of the international research project RAPHAEL (Runoff and Atmospheric Processes for flood HAzard forEcasting and controL together with experiments within the Special Observing Period-SOP conducted in autumn 1999 for the Mesoscale Alpine Programme —MAP. The investigations were based on both field experiments and numerical simulations, using meteorological and hydrological models, of ten major floods that occurred in the past decade in the European Alps. The two basins investigated were the Ticino (6599 km2 at the Lago Maggiore outlet on the southern side of the Alps and the Ammer catchment (709 km2 in the Bavarian Alps. These catchments and their sub-catchments cover an appropriate range of spatial scales with which to investigate and test in an operational context the potential of both mesoscale meteorological and distributed hydrological models for flood forecasting. From the data analyses and model simulations described in this Special Issue, the major sources of uncertainties for flood forecasts in mid-size mountain basins are outlined and the accuracy flood forecasts is assessed. Keywords: floods, mountain hydrology, meteorological models, Alps

  13. Holocene Erosion Patterns in European Alps Viewed from Lake Sediment

    Science.gov (United States)

    Arnaud, F.; Poulenard, J.; Giguet-Covex, C.; Wilhelm, B.; Revillon, S.; Jenny, J. P.; Revel, M.; Enters, D.; Bajard, M.; Fouinat, L.; Doyen, E.; Simonneau, A.; Chapron, E.; Vannière, B.; Sabatier, P.

    2016-12-01

    In this paper we review the scientific efforts that were led over the last decades to reconstruct erosion from continuous alpine lake sediment records. Whereas most available geological records of Holocene terrigenous input focused in climate we propose a regional approach without any a priori regarding erosion forcing factors. In that aim, we integrated a set of sediment sequences from various environment along an altitudinal gradient from 200 up to 2400m asl in Northern French Alps. Altogether our data point climate change as one of the main factor of erosion variability. In particular, the last two cold spells that occurred during the early middle age (Dark Age) and between the 14th and the 20th century AD (Little Ice Age) appear to be outstanding compared to any other periods of enhanced erosion along the Holocene. The climatic forcing of those erosion phases is supported by an increase in the contribution of glacier-eroded material at a regional scale. However, at local scales, our data point the growing importance, since at least the mid Bronze Age (ca. 3500 cal. BP) of human activities as a major erosion factor. This influence peaked during the late Iron Age and Antiquity periods (200 BC - 400 AD) when we record a regional generalised period of enhanced erosion in response to the development of pasturing activities. Thanks to provenance and weathering markers, we evidenced a strong relationship between the changes in ecosystems, soil development and erosion patterns. We hence showed the vegetal colonisation of bared soil led to a period of intense weathering while new soils were under formation between 11,000 and 8,000 cal. BP. Soils then knew an optimum until the onset of the Neoglacial at ca. 4,500 cal. BP prior to decline under both climate and human pressures. Altogether our data point the complexity of processes that affected the Earth critical zone along the Holocene and especially since humans became a major geologic agent. However, we highlight the

  14. Structural diversity of a family of aluminophosphates with Al/P ratio of non-unity

    Science.gov (United States)

    Yu, Jihong; Xu, Ruren; Li, Jiyang

    2000-05-01

    A family of organically templated aluminophosphates (denoted AlPOs) with an Al/P ratio of non-unity has been prepared with 1-D chain, 2-D layer and 3-D open-framework architectures. Their inorganic parts are constructed from alternating Al-centered polyhedra (AlO 4, AlO 5, AlO 4(OH 2) 2) and P-centered tetrahedra P(OAl) nO 4- n ( n=0, 1, 2, 3). The existence of terminal POH and/or PO groups in the structures results in the deviation of Al/P ratio from unity, and the commonly encountered Al/P ratios are 1/2, 3/5, 2/3, 3/4, 4/5 and 5/6. This review will discuss the structural features of these AlPOs with various dimensionalities and stoichiometries.

  15. Changes of forest cover and disturbance regimes in the mountain forests of the Alps.

    Science.gov (United States)

    Bebi, P; Seidl, R; Motta, R; Fuhr, M; Firm, D; Krumm, F; Conedera, M; Ginzler, C; Wohlgemuth, T; Kulakowski, D

    2017-03-15

    Natural disturbances, such as avalanches, snow breakage, insect outbreaks, windthrow or fires shape mountain forests globally. However, in many regions over the past centuries human activities have strongly influenced forest dynamics, especially following natural disturbances, thus limiting our understanding of natural ecological processes, particularly in densely-settled regions. In this contribution we briefly review the current understanding of changes in forest cover, forest structure, and disturbance regimes in the mountain forests across the European Alps over the past millennia. We also quantify changes in forest cover across the entire Alps based on inventory data over the past century. Finally, using the Swiss Alps as an example, we analyze in-depth changes in forest cover and forest structure and their effect on patterns of fire and wind disturbances, based on digital historic maps from 1880, modern forest cover maps, inventory data on current forest structure, topographical data, and spatially explicit data on disturbances. This multifaceted approach presents a long-term and detailed picture of the dynamics of mountain forest ecosystems in the Alps. During pre-industrial times, natural disturbances were reduced by fire suppression and land-use, which included extraction of large amounts of biomass that decreased total forest cover. More recently, forest cover has increased again across the entire Alps (on average +4% per decade over the past 25-115 years). Live tree volume (+10% per decade) and dead tree volume (mean +59% per decade) have increased over the last 15-40 years in all regions for which data were available. In the Swiss Alps secondary forests that established after 1880 constitute approximately 43% of the forest cover. Compared to forests established previously, post-1880 forests are situated primarily on steep slopes (>30°), have lower biomass, a more aggregated forest structure (primarily stem-exclusion stage), and have been more strongly

  16. End of the Little Ice Age in the Alps forced by industrial black carbon

    OpenAIRE

    Painter, Thomas H.; Flanner, Mark G.; Kaser, Georg; Marzeion, Ben; VanCuren, Richard A.; Abdalati, Waleed

    2013-01-01

    The end of the Little Ice Age in the European Alps has long been a paradox to glaciology and climatology. Glaciers in the Alps began to retreat abruptly in the mid-19th century, but reconstructions of temperature and precipitation indicate that glaciers should have instead advanced into the 20th century. We observe that industrial black carbon in snow began to increase markedly in the mid-19th century and show with simulations that the associated increases in absorbed sunlight by black carbon...

  17. Climatological investigations with a view to solar power stations in the Alps

    International Nuclear Information System (INIS)

    Durisch, W.; Hofer, B.; Wuillemin, D.

    1996-01-01

    This project aimed to acquire, evaluate and supply climatological data for solar-thermal and photovoltaic power stations in the Alps. It was carried out by the Paul Scherrer Institute in cooperation with partners from industry and the authorities. Such data are indispensable not only for the construction and operation of solar power plants but also for assessing their potential in the Swiss Alps and their economic competitiveness. Aspects meeting with particular interest are the quantity of the different types of insolation and their quality, i.e., that proportion of them that can be technically harnessed (orig./UA) [de

  18. Pressure variations in the Monte Rosa nappe, Western Alps

    Science.gov (United States)

    Luisier, Cindy; Vaughan-Hammon, Joshua; Baumgartner, Lukas; Schmalholz, Stefan

    2017-04-01

    The Monte Rosa nappe is part of the Penninic nappe stack of the Western Alps. It represents the southern-most European continental basement involved in the alpine orogeny. It consists of a pre-Variscan basement complex, made of mostly metapelites and paragneisses, which were intruded by a Permian-age granitic body (Pawlig, 2001). The nappe is heterogeneously deformed, with localized high strain domains separating low strain domains. The metamorphic record is tightly linked to deformation. Different thermodynamic data bases and approaches were used in the past to estimate the peak alpine metamorphic conditions. They range from 1.2 to 2.7 GPa and 490 to 650˚C, based on metagranite, metapelite, metamafic and whiteschist assemblages. The peak alpine metamorphic assemblage of zoisite, phengite and albite symplectites pseudomorphing magmatic plagioclase is preserved only in the less deformed portions of the nappe. Phengite, garnet and titanite coronas surrounding biotite, quartz and igneous K-feldspar make up the rest of the rock. The metagranite locally grades into 10 to 50 meters whiteschist bodies, consisting of talc-chloritoid-kyanite-phengite-quartz, which can contain carbonate and garnet. Their chemistry is interpreted as a metasomatic product of the late magmatic hydrothermal alteration of the granite, whereas their mineralogy results from the alpine high pressure metamorphism (Pawlig and Baumgartner, 2001; Luisier et al., 2015). We performed a phase petrology and textural study to consistently estimate peak alpine metamorphic conditions in the granite and the related whiteschists. Textural observations were used to select the best-preserved high-pressure metagranite samples. Inherited magmatic feldspar textures indicate that jadeite was never formed in these granites, confirmed independently by Si in phengite barometer (1.2 to 1.5 GPa). Note that the granite contains the phengite buffer assemblage of Massonne and Schreyer (1987). Thermodynamic calculations using

  19. Natural gas seeps in the French Alps: Sources and pathways

    Science.gov (United States)

    Kloppmann, Wolfram; Blessing, Michaela; Proust, Eric; Gal, Frédéric; Bentivegna, Gaetan; Henry, Benoit; Defossez, Pierrick; Catherine, Lerouge; Humez, Pauline; Mayer, Bernhard; Millot, Romain; Gaucher, Eric

    2016-04-01

    Natural gas emanations are part of the geochemical baseline to take into account when assessing global greenhouse gas emissions and potential impacts of conventional and unconventional gas exploration and exploitation on groundwater. Examples of such natural gas macro-seeps are known in several parts of the world (Etiope et al., 2009). Only a limited number of them have been characterized for their gas and isotopic compositions. Such analyses can provide essential information for baseline studies, providing insight in the sources (biogenic vs. thermogenic or modified thermogenic) and pathways of such seeps and may allow for distinction of natural seeps from stray gas leakage associated with human activities. Here, we report gas concentrations and multi-isotope data (δ13C and δ2H of methane and ethane, δ13C and δ18O of CO2, 3He/4He ratio) of two gas seeps in the French subalpine chains, both in a similar geological and structural position within Middle Jurassic claystones along the eastern border of the large synclinal structures of the Vercors and the Chartreuse massifs (Moss, 1992). The "ardent fountain" (fontaine ardente) of Le Gua, 30 km south of Grenoble has most likely the longest continuous written record of existence of any individual natural gas seep, mentioned explicitly as early as the first quarter of the 5th century (Augustin of Hippo (St. Augustin), approx. 426) This natural seep was described in the past as a "wet seep" associated with a spring, whereas the second investigated seep, Rochasson near Meylan north of Grenoble, is a dry seep. Both seeps contain methane and ethane with thermogenic C and H isotope signatures, comparable with a seep in the Northern Swiss Alps at Giswil (Etiope et al., 2010) but with a higher dryness (C1/(C2+C3)>1000) for the Le Gua seep, possibly due to molecular fractionation upon advective fluid+gas migration (Etiope et al., 2009). Maturity (R0) of the reservoir rocks deduced from δ13C(CH4), δ13C(C2H6) is similar to

  20. Demodicosis in Chamois ( Rupicapra rupicapra subsp. rupicapra) in the Italian Alps, 2013-14.

    Science.gov (United States)

    Salvadori, Claudia; Formenti, Nicoletta; Trogu, Tiziana; Lanfranchi, Paolo; Papini, Roberto A; Poli, Alessandro

    2016-04-28

    We report demodicosis in five alpine chamois ( Rupicapra rupicapra subsp. rupicapra) from the Italian Alps that showed moderate crusts on the head and dorsal aspect of the trunk. We detected intramural folliculitis, moderate dermatitis, and T-lymphocytes and macrophages associated with Demodex spp. in follicles and sebaceous glands.

  1. Structural petrology of the garnet-peridotite of Alpe Arami (Ticino, Switzerland)

    NARCIS (Netherlands)

    Möckel, J.R.

    1969-01-01

    The decomposition of pyrope-rich garnet into spinel-amphibole symplektite and the alteration of the latter into chlorite indicate the presence of three successive mineral parageneses in the peridotite of Alpe Arami: a garnet-peridotite, a spinelamphibole-peridotite, and a chlorite-peridotite

  2. Implementation of Sustainable Tourism in the German Alps: A Case Study

    Directory of Open Access Journals (Sweden)

    Ivan Paunović

    2017-02-01

    Full Text Available What are the processes behind efforts for more sustainable mountain destinations in the German Alps and what are the views of different tourism stakeholders on these processes? The research deals both with threats pushing the agenda of sustainable development (such as climate change and depletion of resources, indicators of sustainable tourism (to measure the scope of change, as well as cross-border cooperation and stakeholder engagement in the German Alps. The data was collected through 30 interviews with individuals dealing with tourism development and sustainable tourism development in the German Alps. The findings suggest that a holistic approach and collection and dissemination of data and knowledge on sustainability are the basis for developing sustainable mountain tourism. Implementation and monitoring should focus on specific flagship sustainable tourism products, as well as on a destination in a broader sense and the sustainable tourism market. Three themes emerged as important for implementation of sustainable tourism in the German Alps: indicators of sustainable tourism, cross-border cooperation and stakeholder engagement.

  3. Protracted fluid-induced melting during Barrovian metamorphism in the Central Alps

    DEFF Research Database (Denmark)

    Rubatto, Daniela; Hermann, Jörg; Berger, Alfons

    2009-01-01

    The timing and dynamics of fluid-induced melting in the typical Barrovian sequence of the Central Alps has been investigated using zircon chronology and trace element composition. Multiple zircon domains in leucosomes and country rocks yield U-Pb ages spanning from ~32 to 22 Ma. The zircon formed...

  4. Do diatoms in the Swiss Alps reflect the length of ice-cover?

    NARCIS (Netherlands)

    Lotter, A.F.; Bigler, C.

    2000-01-01

    ment core from Hagelseewli (2339 m asl, Swiss Alps) give information about the present-day seasonal cycle of diatom blooms, taphonomic processes in the lake basin and the lake’s history. Analyses of surficial sediments show that water depth and thus light and nutrient availability is the most

  5. Thermal evolution of high-pressure metamorphic rocks in the Alps

    NARCIS (Netherlands)

    Brouwer, F.M.

    2000-01-01

    There are two major and currently unresolved issues in Alpine geology concerning the metamorphic evolution of the rocks in the internal zones of the Alps. First, rocks showing evidence for geologically young, high-pressure to very high-pressure metamorphism are now exposed at the Earth's surface,

  6. Relationship between Arm Span Measurements and Body Height in Dinaric Alpes Population: a Systematic Review

    Directory of Open Access Journals (Sweden)

    Bojan Masanovic

    2017-08-01

    Full Text Available Several researches have reported the benefit of using various body parameters in predicting standing height, and arm span happened to be one of the most reliable ones in adults. On the other hand, it is well-known the tallness and body proportions are specific in the area that are covered by Dinaric Alpes. Therefore, the purpose of this study was to investigate the potential relationship between arm span measurements and body height in Dinaric Alpes population. The most visible electronic database (Google Scholar was searched for original research articles available until September 2017. Then research findings were summarized and relationship between arm span measurements and body height in Dinaric Alpes population were identified, as well as areas of future research were recommended. The assessment of body height using various anthropometric measures is very typical from the past centuries and it has been attempted to be studied by many researchers. However, it is important to underline that the arm span has been obtained as the most reliable body indicator for predicting the true height of an individual. However, the studies sampled with the populations lived at Dinaric Alpes mountains have specific estimates. Therefore, all above-mentioned have confirmed the necessity for developing separate body height models for each population on account of ethnic as well as regional differences.

  7. Carbonate platforms in the Dolomites area of the southern Alps - historic perspectives on progress in Sedimentology

    NARCIS (Netherlands)

    Schlager, W.; Keim, L.

    2009-01-01

    The area of the Dolomites in the Southern Alps exhibits some of the best outcrops of carbonate platforms and platform-to-basin transitions in the world. The region has attracted geologists since the early 19th Century and has been a centre of stratigraphic and sedimentological research ever since.

  8. Linking Up the Alps: How Networks of Local Political Actors Build the Pan-Alpine Region

    Directory of Open Access Journals (Sweden)

    Clive H. Church

    2017-05-01

    Full Text Available Reviewed: Linking Up the Alps: How Networks of Local Political Actors Build the Pan-Alpine Region By Cristina Del Biaggio. Bern, Switzerland: Peter Lang, 2016. 370 pp. €52.50. ISBN 978-3-0343-1630-9.

  9. Past processes in peats : untangling the origin of dried peat in the Australian alps

    International Nuclear Information System (INIS)

    Grover, S.P.P.; Tisdall, J.M.; Jacobsen, G.

    2005-01-01

    Peat soils form where decomposition is hindered, often by a combination of cold and wet conditions, such that production of organic matter outweighs decomposition. Such conditions are rare in the hot, dry continent of Australia. Consequently peat barely features on a map of Australian soils, though small areas are noted to occur in the alps and along the humid east coast. It is pertinent to ask several questions about the origin of peat in the alps. Is dried peat a remnant of bog peat? And if so, when did bogs drain to form dried peat? The study site, on Wellington Plains in the south-east Gippsland Alps, contains a substantial area of bog peat and extensive areas of dried peat. AMS radiocarbon dating of surface, base and, for the bog peat only, mid-profile peat samples, was carried out at ANSTO. 14 C dating enabled us to look at the initiation of peat accumulation, but the change from bog peat to dried peat is thought to have occurred more recently, since the introduction of stock to the alps. The short half-life of 210 Pb (22.6 years) and the constant supply from the upper atmosphere makes 210 Pb an appropriate technique to investigate this time frame. 5 refs., 1 fig., 2 tabs

  10. Petrofabrics, microtextures and dislocation substructures of olivine in a peridotite mylonite (Alpe Arami, Switzerland)

    NARCIS (Netherlands)

    Buiskool Toxopeus, J.M.A.

    1978-01-01

    The development of preferred crystallographic orientation and dimensional fabric of olivine in relation to deformation were investigated in a thin, continuous chlorite peridotite mylonite rim around the garnet peridotite body of Alpe Arami, Ticino, Switzerland. The mylonite is a foliated rock

  11. Total energy, equation of state and bulk modulus of AlP, AlAs and ...

    Indian Academy of Sciences (India)

    Recently proposed model potential which combines both linear and quadratic types of interactions is employed for the investigation of some properties like the total energy, equation of state and bulk modulus of AlP, AlAs and AlSb semiconductor compounds using higher-order perturbation theory. The model potential ...

  12. The European Alps as an interrupter of the Earth's conductivity structures

    Science.gov (United States)

    Al-Halbouni, D.

    2013-07-01

    Joint interpretation of magnetotelluric and geomagnetic depth sounding results in the period range of 10-105 s in the Western European Alps offer new insights into the conductivity structure of the Earth's crust and mantle. This first large scale electromagnetic study in the Alps covers a cross-section from Germany to northern Italy and shows the importance of the alpine mountain chain as an interrupter of continuous conductors. Poor data quality due to the highly crystalline underground is overcome by Remote Reference and Robust Processing techniques and the combination of both electromagnetic methods. 3-D forward modeling reveals on the one hand interrupted dipping crustal conductors with maximum conductances of 4960 S and on the other hand a lithosphere thickening up to 208 km beneath the central Western Alps. Graphite networks arising from Palaeozoic sedimentary deposits are considered to be accountable for the occurrence of high conductivity and the distribution pattern of crustal conductors. The influence of huge sedimentary Molasse basins on the electromagnetic data is suggested to be minor compared with the influence of crustal conductors. Dipping direction (S-SE) and maximum angle (10.1°) of the northern crustal conductor reveal the main thrusting conditions beneath the Helvetic Alps whereas the existence of a crustal conductor in the Briançonnais supports theses about its belonging to the Iberian Peninsula. In conclusion the proposed model arisen from combined 3-D modeling of noise corrected electromagnetic data is able to explain the geophysical influence of various structural features in and around the Western European Alps and serves as a background for further upcoming studies.

  13. The cryogenic photon detection system for the ALPS II experiment. Characterization, optimization and background rejection

    International Nuclear Information System (INIS)

    Bastidon, Noemi Alice Chloe

    2017-01-01

    The search for new fundamental bosons at very low mass is the central objective of the ALPS II experiment which is currently set up at the Deutsches Elektronen-Synchrotron (DESY, Hamburg). This experiment follows the light-shining-through-the-wall concept where photons could oscillate into weakly interacting light bosons in front of a wall and back into photons behind the wall, giving the impression that light can shine through a light tight barrier. In this concept, the background-free detection of near-infrared photons is required to fully exploit the sensitivity of the apparatus. The high efficiency single-photon detection in the near-infrared is challenging and requires a cryogenic detector. In this project, a Transition-Edge Sensor (TES) operated below 100mK will be used to detect single photons. This thesis focuses on the characterization and optimization of the ALPS II detector system including an Adiabatic Demagnetisation Refrigerator (ADR) with its two-stage pulse-tube cooler, two TES detectors and their Superconducting Quantum Interference Devices (SQUIDs) read-out system. Stability of the detection system over time is a priority in the ALPS II experiment. It is in this context that the cooling system has been subjected to many upgrades. In the framework of this thesis, the cooling setup has been studied in detail in order to optimize its cooling performances. Furthermore, the stability of the detector has been studied according to various criteria. Other essential parameters of the ALPS II experiment are its detection efficiency and its background rate. Indeed, the sensitivity of the experiment directly depends on these two characteristics. Both elements have been studied in depth in order to define if the chosen TES detector will meet ALPS IIc specifications.

  14. Permian high-temperature metamorphism in the Western Alps (NW Italy)

    Science.gov (United States)

    Kunz, Barbara E.; Manzotti, Paola; von Niederhäusern, Brigitte; Engi, Martin; Darling, James R.; Giuntoli, Francesco; Lanari, Pierre

    2018-01-01

    During the late Palaeozoic, lithospheric thinning in part of the Alpine realm caused high-temperature low-to-medium pressure metamorphism and partial melting in the lower crust. Permian metamorphism and magmatism has extensively been recorded and dated in the Central, Eastern, and Southern Alps. However, Permian metamorphic ages in the Western Alps so far are constrained by very few and sparsely distributed data. The present study fills this gap. We present U/Pb ages of metamorphic zircon from several Adria-derived continental units now situated in the Western Alps, defining a range between 286 and 266 Ma. Trace element thermometry yields temperatures of 580-890 °C from Ti-in-zircon and 630-850 °C from Zr-in-rutile for Permian metamorphic rims. These temperature estimates, together with preserved mineral assemblages (garnet-prismatic sillimanite-biotite-plagioclase-quartz-K-feldspar-rutile), define pervasive upper-amphibolite to granulite facies conditions for Permian metamorphism. U/Pb ages from this study are similar to Permian ages reported for the Ivrea Zone in the Southern Alps and Austroalpine units in the Central and Eastern Alps. Regional comparison across the former Adriatic and European margin reveals a complex pattern of ages reported from late Palaeozoic magmatic and metamorphic rocks (and relics thereof): two late Variscan age groups ( 330 and 300 Ma) are followed seamlessly by a broad range of Permian ages (300-250 Ma). The former are associated with late-orogenic collapse; in samples from this study these are weakly represented. Clearly, dominant is the Permian group, which is related to crustal thinning, hinting to a possible initiation of continental rifting along a passive margin.

  15. The cryogenic photon detection system for the ALPS II experiment. Characterization, optimization and background rejection

    Energy Technology Data Exchange (ETDEWEB)

    Bastidon, Noemi Alice Chloe

    2017-01-12

    The search for new fundamental bosons at very low mass is the central objective of the ALPS II experiment which is currently set up at the Deutsches Elektronen-Synchrotron (DESY, Hamburg). This experiment follows the light-shining-through-the-wall concept where photons could oscillate into weakly interacting light bosons in front of a wall and back into photons behind the wall, giving the impression that light can shine through a light tight barrier. In this concept, the background-free detection of near-infrared photons is required to fully exploit the sensitivity of the apparatus. The high efficiency single-photon detection in the near-infrared is challenging and requires a cryogenic detector. In this project, a Transition-Edge Sensor (TES) operated below 100mK will be used to detect single photons. This thesis focuses on the characterization and optimization of the ALPS II detector system including an Adiabatic Demagnetisation Refrigerator (ADR) with its two-stage pulse-tube cooler, two TES detectors and their Superconducting Quantum Interference Devices (SQUIDs) read-out system. Stability of the detection system over time is a priority in the ALPS II experiment. It is in this context that the cooling system has been subjected to many upgrades. In the framework of this thesis, the cooling setup has been studied in detail in order to optimize its cooling performances. Furthermore, the stability of the detector has been studied according to various criteria. Other essential parameters of the ALPS II experiment are its detection efficiency and its background rate. Indeed, the sensitivity of the experiment directly depends on these two characteristics. Both elements have been studied in depth in order to define if the chosen TES detector will meet ALPS IIc specifications.

  16. Glaciation's topographic control on Holocene erosion at the eastern edge of the Alps

    Science.gov (United States)

    Dixon, Jean L.; von Blanckenburg, Friedhelm; Stüwe, Kurt; Christl, Marcus

    2016-12-01

    What is the influence of glacial processes in driving erosion and uplift across the European Alps? It has largely been argued that repeated erosion and glaciation sustain isostatic uplift and topography in a decaying orogen. But some parts of the Alps may still be actively uplifting via deep lithospheric processes. We add insight to this debate by isolating the role of post-glacial topographic forcing on erosion rates. To do this, we quantify the topographic signature of past glaciation on millennial-scale erosion rates in previously glaciated and unglaciated catchments at the easternmost edge of the Austrian Alps. Newly measured catchment-wide erosion rates, determined from cosmogenic 10Be in river-borne quartz, correlate with basin relief and mean slope. GIS-derived slope-elevation and slope-area distributions across catchments provide clear topographic indicators of the degree of glacial preconditioning, which further correlates with erosion rates. Erosion rates in the easternmost, non-glaciated basins range from 40 to 150 mm ky-1 and likely reflect underlying tectonic forcings in this region, which have previously been attributed to recent (post 5 Ma) uplift. By contrast, erosion rates in previously glaciated catchments range from 170 to 240 mm ky-1 and reflect the erosional response to local topographic preconditioning by repeated glaciations. Together, these data suggest that Holocene erosion across the Eastern Alps is strongly shaped by the local topography relict from previous glaciations. Broader, landscape-wide forcings, such as the widely debated deep mantle-driven or isostatically driven uplift, result in lesser controls on both topography and erosion rates in this region. Comparing our data to previously published erosion rates across the Alps, we show that post-glacial erosion rates vary across more than 2 orders of magnitude. This high variation in post-glacial erosion may reflect combined effects of direct tectonic and modern climatic forcings but

  17. Effect of Al and AlP on the microstructure of Mn-30 wt.%Si alloy

    Energy Technology Data Exchange (ETDEWEB)

    Wu Yuying [Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, Jing Shi Road 73, Jinan 250061 (China); Liu Xiangfa [Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, Jing Shi Road 73, Jinan 250061 (China)], E-mail: xfliu@sdu.edu.cn

    2008-04-15

    Effect of Al and AlP particles on the microstructure of near eutectic Mn-Si alloy (Mn-30 wt.%Si) was studied by Electron Probe Micro-analyzer (EPMA) and Differential Scanning Calorimeter (DSC). Crystal lattice correspondence analyses show that both Al and AlP have good lattice matching coherence relationships with MnSi phase, and the addition of Al and AlP particles results in an abnormal eutectic structure, i.e. the eutectic constitution MnSi and Mn{sub 5}Si{sub 3} precipitate separately: MnSi precipitates firstly, and then the Mn{sub 5}Si{sub 3} phase.

  18. End of the "Little Ice Age" in the Alps not forced by industrial black carbon

    Science.gov (United States)

    Sigl, Michael; Osmont, Dimtri; Gabrieli, Jacopo; Barbante, Carlo; Schwikowski, Margit

    2016-04-01

    Light absorbing aerosols present in the atmosphere and cryosphere play an important role in the climate system. Their presence in ambient air and snow changes radiative properties of these media, thus contributing to increased atmospheric warming and snowmelt. High spatio-temporal variability of aerosol concentrations in these media and a shortage of long-term observations contribute to large uncertainties in properly assigning the climate effects of these aerosols through time. Glaciers in the European Alps began to retreat abruptly from their mid-19th century maximum, marking what appeared to be the end of the Little Ice Age. Radiative forcing by increasing deposition of industrial black carbon to snow has been suggested as the main driver of the abrupt glacier retreats in the Alps (Painter et al. 2012). Basis for this hypothesis were model simulations using ice-core measurements of elemental carbon at low temporal resolution from two ice cores in the Alps. Here we present sub-annually resolved, well replicated ice-core measurements of refractory black carbon (rBC; using a SP2 soot photometer), mineral dust (Fe, Ca), biomass burning (NH4, K) and distinctive industrial pollution tracers (Bi, Pb, SO4) from an ice core in the Alps covering the past 250 years. These reconstructions allow to precisely compare the timing of observed acceleration of glacier melt in the mid-19th century with that of the increase of soot deposition on ice-sheets caused by the industrialization of Western Europe. Our study suggests that at the time when European rBC emission rates started to significantly increase Alpine glaciers have already experienced more than 70% of their total 19th century length reduction. Industrial BC emissions can therefore not been considered as the primary forcing of the rapid deglaciation at the end of the Little Ice Age in the Alps. References: Painter, T. H., M. G. Flanner, G. Kaser, B. Marzeion, R. A. VanCuren, and W. Abdalati (2013), End of the Little Ice

  19. Palaeoenvironmental changes in the Late Triassic (Rhaetian) of the Northern Calcareous Alps

    DEFF Research Database (Denmark)

    Mette, Wolfgang; Elsler, Armin; Korte, Christoph

    2012-01-01

    The Triassic Kössen Formation (Rhaetian) in the Northern Calcareous Alps has been studied with respect to oxygen and carbon isotope ratios of brachiopod shells and whole rocks, together with the stratigraphic range and ecology of ostracod assemblages, in order to detect palaeotemperature changes...... in the Kössen Formation and determine their significance for environmental and climatic conditions in the Rhaetian sea of the Eiberg Basin (Northern Calcareous Alps). For this purpose 60 δ 18O measurements on 43 articulate brachiopods samples from 8 different horizons were carried out. The results indicate...... further suggest that the palaeobathymetric temperature gradient in the Eiberg Basin was rather low, indicating that almost no deep water exchange with Tethys existed at that time. Carbon isotopes from brachiopod shells and from bulk carbonates show a trend to heavier values from the Hochalm Member up...

  20. 24th International Conference on Robotics in Alpe-Adria-Danube Region

    CERN Document Server

    2016-01-01

    This volume includes the Proceedings of the 24th International Conference on Robotics in Alpe-Adria-Danube Region, RAAD 2015, which was held in Bucharest, Romania, on May 27-29, 2015. The Conference brought together academic and industry researchers in robotics from the 11 countries affiliated to the Alpe-Adria-Danube space: Austria, Croatia, Czech Republic, Germany, Greece, Hungary, Italy, Romania, Serbia, Slovakia and Slovenia, and their worldwide partners. According to its tradition, RAAD 2015 covered all important areas of research, development and innovation in robotics, including new trends such as: bio-inspired and cognitive robots, visual servoing of robot motion, human-robot interaction, and personal robots for ambient assisted living. The accepted papers have been grouped in nine sessions: Robot integration in industrial applications; Grasping analysis, dexterous grippers and component design; Advanced robot motion control; Robot vision and sensory control; Human-robot interaction and collaboration;...

  1. Sensitivity of the French Alps snow cover to the variation of climatic variables

    Directory of Open Access Journals (Sweden)

    E. Martin

    Full Text Available In order to study the sensitivity of snow cover to changes in meteorological variables at a regional scale, a numerical snow model and an analysis system of the meteorological conditions adapted to relief were used. This approach has been successfully tested by comparing simulated and measured snow depth at 37 sites in the French Alps during a ten year data period. Then, the sensitivity of the snow cover to a variation in climatic conditions was tested by two different methods, which led to very similar results. To assess the impact of a particular "doubled CO2" scenario, coherent perturbations were introduced in the input data of the snow model. It was found that although the impact would be very pronounced, it would also be extremely differentiated, dependent on the internal state of the snow cover. The most sensitive areas are the elevations below 2400 m, especially in the southern part of the French Alps.

  2. Recent variation of snow as a water resource in the Japanese Alps

    Science.gov (United States)

    Suzuki, Keisuke

    2013-04-01

    The region of Japan that lies along the Sea of Japan is known to experience some of the heaviest snowfall in the world. In this region, precipitation brought by snowfall is more important as a water resource than rainfall. Recent studies have reported that the amount of snowfall in Japan will decrease as a result of global warming. However, these studies used data observed at low altitudes. The question arises whether the same theory can be applied to high-altitude mountain areas. Therefore, in this study, we discuss the relationship between temperature and the amount of snow using observation data for the Japanese Alps region and present the results of some meteorological observations we carried out at high-altitude sites in the Japanese Alps region. A relatively large part of the Japanese Alps region is within the altitude range of 1,000-3,000 m and the snowfall there serves as a vital water resource. Therefore, the effect of global warming on snow accumulation in mountain areas is a crucial issue. At places with high altitude in the Japanese Alps, it is rare for the air temperature to rise to around 0 °C at the current levels of temperature increase. An increase in winter precipitation should lead directly to an increase in snow accumulation in the high altitude area. Under the present circumstances, the role of the mountain regions as a system for purification of water and air that is essential for human beings' existence is not duly recognized and is undervalued. However, there is no doubt that we need to understand the response of mountain regions to global-scale environmental change in the near future. To achieve that, we need to discuss the matter based on proper observation data. We therefore plan to continue our meteorological observations at high altitude mountain regions.

  3. Continuous micro-earthquake catalogue of the central Southern Alps, New Zealand

    Science.gov (United States)

    Michailos, Konstantinos; Townend, John; Savage, Martha; Chamberlain, Calum

    2017-04-01

    The Alpine Fault is one of the most prominent tectonic features in the South Island, New Zealand, and is inferred to be late in its seismic cycle of M 8 earthquakes based on paleoseismological evidence. Despite this, the Alpine Fault displays low levels of contemporary seismic activity, with little documented on-fault seismicity. This low magnitude seismicity, often below the completeness level of the GeoNet national seismic catalogue, may inform us of changes in fault character along-strike and might be used for rupture simulations and hazard planning. Thus, compiling a micro-earthquake catalogue for the Southern Alps prior to an expected major earthquake is of great interest. Areas of low seismic activity, like the central part of the Alpine Fault, require data recorded over a long duration to reveal temporal and spatial seismicity patterns and provide a better understanding for the processes controlling seismogenesis. The continuity and density of the Southern Alps Microearthquake Borehole Array (SAMBA; deployed in late 2008) allows us to study seismicity in the Southern Alps over a more extended time period than has ever been done previously. Furthermore, by using data from other temporary networks (e.g. WIZARD, ALFA08, DFDP-10) we are able to extend the region covered. To generate a spatially and temporally continuous catalogue of seismicity in New Zealand's central Southern Alps, we used automatic detection and phase-picking methods. We used an automatic phase-picking method for both P- and S- wave arrivals (kPick; Rawles and Thurber, 2015). Using almost 8 years of seismic data we calculated about 9,000 preliminary earthquake. The seismicity is clustered and scattered and a previously observed seismic gap between the Wanganui and Whataroa rivers is also identified.

  4. Vegetation changes and timberline fluctuations in the Central Alps as indicators of holocene climatic oscillations

    Energy Technology Data Exchange (ETDEWEB)

    Wick, L.; Tinner, W. [Univ. of Bern (Switzerland)

    1997-11-01

    Pollen and plant-macrofossil data are presented for two lakes near the timberline in the Italian (Lago Basso, 2250 m) and Swiss Central Alps (Gouille Rion, 2343 m). The reforestation at both sites started at 9700-9500 BP with Pinus cembra, Larix decidua, and Betula. The timberline reached its highest elevation between 8700 and 5000 BP and retreated after 5000 BP, due to a mid-Holocene climatic change and increasing human impact since about 3500 BP (Bronze Age). The expansion of Picea abies at Lago Basso between ca. 7500 and 6200 BP was probably favored by cold phases accompanied by increased oceanicity, whereas in the area of Gouille Rion, where spruce expanded rather late (between 4500 and 3500 BP), human influence equality might have been important. The mass expansion of Alnus viridis between ca. 5000 and 3500 BP probably can be related to both climatic change and human activity at timberline. During the early and middle Holocene a series of timberline fluctuations is recorded as declines in pollen and macrofossil concentrations of the major tree species, and as increases in nonarboreal pollen in the pollen percentage diagram of Gouille Rion. Most of the periods of low timberline can be correlated by radiocarbon dating the climatic changes in the Alps as indicated by glacier advances in combination with palynological records, solifluction, and dendroclimatical data. Lago Basso and Gouille Rion are the only sites in the Alps showing complete palaeobotanical records of cold phases between 10,000 and 2000 BP with very good time control. The altitudinal range of the Holocene treeline fluctuations caused by climate most likely was not more than 100 to 150 m. A possible correlation of a cold period at ca. 7500-6500 BP (Misox oscillation) in the Alps is made with paleoecological data from North American and Scandinavia and a climate signal in the GRIP ice core from central Greenland 8200 yr ago (ca. 7400 yr uncal. BP).

  5. Effects of microsite on growth of Pinus cembra in the subalpine zone of the Austrian Alps

    OpenAIRE

    Li, Mai-He; Yang, Jian

    2004-01-01

    International audience; We examined growth in Pinus cembra L. (28 years old) across the treeline ecotone from 1900 to 2100 m elevation in the Alps. Eighteen plots were chosen at different microsites which are defined as a combination of elevation and steepness (gentle vs. steep slope) on a south-facing slope in the Schmirn Valley, Tyrol/Austria. Over the range of altitudes studied, elevation and steepness had influences on growth depending on tree size: (1) Elevation and steepness had little ...

  6. Integrative taxonomy reveals a new species of Callisto ( Lepidoptera , Gracillariidae ) in the Alps

    OpenAIRE

    Kirichenko, Natalia; Huemer, Peter; Deutsch, Helmut; Triberti, Paolo; Rougerie, Rodolphe; Lopez-Vaamonde, Carlos

    2015-01-01

    Abstract Europe has one of the best-known Lepidopteran faunas in the world, yet many species are still being discovered, especially in groups of small moths. Here we describe a new gracillariid species from the south-eastern Alps, Callisto basistrigella Huemer, Deutsch & Triberti, sp. n. It shows differences from its sister species Callisto coffeella in morphology, the barcode region of the cytochrome c oxidase I gene and the nuclear gene histone H3. Both Callisto basistrigella and Callisto c...

  7. Alkaline Phosphatase Activity in Seawater: Influence of Reaction Conditions on the Kinetic Parameters of ALP

    OpenAIRE

    Orhanović, Stjepan; Pavela-Vrančič, Maja

    2000-01-01

    Alkaline phosphatase (ALP) is an extracellular enzyme enabling utilisation of phosphomonoesters as the source of inorganic phosphate (Pi) required for the maintenance of cellular metabolism. Its catalytic properties have been extensively studied in aquatic environments in an attempt to describe its influence on phosphorous cycling in natural waters. Despite its significance and frequent determination, no standard method has been developed so far. In order to examine the effect of various reac...

  8. Terricolous Lichens in the Glacier Forefield of the Pasterze (Eastern Alps, Carinthia, Austria)

    Science.gov (United States)

    Bilovitz, Peter O.; Wallner, Anja; Tutzer, Veronika; Nascimbene, Juri; Mayrhofer, Helmut

    2016-01-01

    Summary The investigation of lichens on soil, plant debris and terricolous mosses in the glacier forefield of the Pasterze yielded 35 lichen species. Placidiopsis oreades Breuss (Verrucariales) is new to Austria. Three sampling sites were established at increasing distance from the glacier, in order to compare species diversity, abundance and composition within the forefield and with four other glacier forefields of the Eastern Alps. PMID:26877565

  9. Climate - Change - Alps. Tourism and regional planning in weather load. Proceedings; Klima - Wandel - Alpen. Tourismus und Raumplanung im Wetterstress. Tagungsband

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2006-07-01

    Within the international annual conference ''Climate-Change-Alps Tourism and regional planning under weather load'' between 18th and 20th May, 2006, in Bad Hindelang (federal Republic of Germany) lectures were held to the following topics: (a) CIPRA resolution; (b) Future in the Alps - Distribution of knowledge, networking of people; (c) Climatic change and climate protection; (d) Planning of nature dangers; (e) Tourism.

  10. Bound and resonant surface states at the (110) surfaces of AlSb, AlAs, and AlP

    International Nuclear Information System (INIS)

    Beres, R.P.; Allen, R.E.; Buisson, J.P.; Bowen, M.A.; Blackwell, G.F.; Hjalmarson, H.P.; Dow, J.D.

    1982-01-01

    The dispersion curves E(k-bar) have been calculated for bound and resonant (110) surface states of AlSb, AlAs, and AlP. AlSb is predicted to have no surface states within the bulk fundamental band gap, but AlAs and AlP are predicted to have surface state band minima which are very near the conduction band edge, and could lie either within the gap or immediately above the edge

  11. Climate change in the Alps: impacts and natural risks. ONERC's Technical Report N.1

    International Nuclear Information System (INIS)

    2008-01-01

    Mountain ranges are very sensitive to climatic variations. The impacts of climate change on theses territories can be various, from the modification of the biodiversity to the permafrost melting and the evolution of natural hazards. The assessment of temperature rise and its impacts on mountains constitutes an important issue considering the strong uncertainties and the specific sensitivity linked to these areas. The territorial manager - policy makers and technicians - have to deal with this questioning for the implementation of short term actions as well as for strategic choices in terms of land planning and spatial development. This is why 22 public institutions from seven Alpine countries were involved in the European ClimChAlp project. The ONERC participated actively to this project in collaboration with the Rhone-Alpes Region and the Pole Grenoblois Risques Naturels. This report is based on the synthesis realised by the French partners to propose a common base of knowledge about climate change and its impacts in the Alps. (authors)

  12. Encounters between Alpine ibex, Alpine chamois and domestic sheep in the Swiss Alps

    Directory of Open Access Journals (Sweden)

    Marie-Pierre Ryser-Degiorgis

    2002-12-01

    Full Text Available Abstract Information regarding spatio-temporal relationships and encounters of sympatric domestic sheep, Alpine ibex (Capra ibex ibex and Alpine chamois (Rupicapra rupicapra rupicapra in the Swiss Alps were systematically registered to evaluate the possibility of an interspecific transmission of infectious agents on pastures. Observations were performed in alpine regions of four Swiss cantons during the 1997 and 1998 mountain summer grazing season. In the main study area, Val Chamuera (canton of Grisons, a consistent reduction in the number of ibexes was observed after the arrival of sheep on the pasture. Some ibexes remained for a longer time in the area, but in general, ibexes and sheep did not use the same compartments of the area simultaneously. However, a salt lick for sheep attracted the ibexes, and several encounters were recorded in the compartments close to this salt lick. Several encounters registered in other areas of the Swiss Alps also occurred in the neighbourhood of a salt lick; however, in other cases different species were attracted by rich pastures. The study indicates that encounters (0-50 m between free-ranging individuals of different Caprinae species, domestic and wild, are not uncommon events in the Alps. Therefore, encounters can be considered to be a predisposing factor for interspecific transmission of infectious agents such as Mycoplasma conjunctivae, causing keratoconjunctivitis in chamois, ibex, domestic sheep and goats.

  13. Variation trend of snowfall in the Kamikochi region of the Japanese Alps

    Science.gov (United States)

    Suzuki, K.

    2017-12-01

    The Japanese Alps experience exceptionally heavy snowfall, extreme even by global standards, and in spring and summer the melting snow becomes a valuable water resource. The snow effectively acts as a natural dam when it accumulates in watersheds during winter. However, there have been no observations of the amount of snow in high-altitude regions of Japan. Therefore, we cannot discuss the effect of global warming on the change in the amount of snow in these regions based on direct observation data. We were, however, able to obtain climatic and hydrologic data for high-altitude sites in the Japanese Alps, and discuss the variations in these conditions in the Kamikochi region (altitude 1490 m-3190 m) of the Japanese Alps over a 68-year period using these observed data. No long-term trends are observed in the annual mean, maximum, or minimum temperatures at Taisho-ike from 1945 to 2012; the total annual precipitation shows a statistically significant decreasing trend. The annual total snowfall at Taisho-ike from 1969 to 2012 shows a statistically significant increasing trend. The annual total runoff of the Azusa River from 1945 to 2012 shows a statistically significant increasing trend, as does the snowmelt runoff to the river (which occurs from May to July). We can thus conclude that the annual snowfall in the Azusa River catchment has increased in recent years.

  14. The ALPS project release 2.0: open source software for strongly correlated systems

    International Nuclear Information System (INIS)

    Bauer, B; Gamper, L; Gukelberger, J; Hehn, A; Isakov, S V; Ma, P N; Mates, P; Carr, L D; Evertz, H G; Feiguin, A; Freire, J; Koop, D; Fuchs, S; Gull, E; Guertler, S; Igarashi, R; Matsuo, H; Parcollet, O; Pawłowski, G; Picon, J D

    2011-01-01

    We present release 2.0 of the ALPS (Algorithms and Libraries for Physics Simulations) project, an open source software project to develop libraries and application programs for the simulation of strongly correlated quantum lattice models such as quantum magnets, lattice bosons, and strongly correlated fermion systems. The code development is centered on common XML and HDF5 data formats, libraries to simplify and speed up code development, common evaluation and plotting tools, and simulation programs. The programs enable non-experts to start carrying out serial or parallel numerical simulations by providing basic implementations of the important algorithms for quantum lattice models: classical and quantum Monte Carlo (QMC) using non-local updates, extended ensemble simulations, exact and full diagonalization (ED), the density matrix renormalization group (DMRG) both in a static version and a dynamic time-evolving block decimation (TEBD) code, and quantum Monte Carlo solvers for dynamical mean field theory (DMFT). The ALPS libraries provide a powerful framework for programmers to develop their own applications, which, for instance, greatly simplify the steps of porting a serial code onto a parallel, distributed memory machine. Major changes in release 2.0 include the use of HDF5 for binary data, evaluation tools in Python, support for the Windows operating system, the use of CMake as build system and binary installation packages for Mac OS X and Windows, and integration with the VisTrails workflow provenance tool. The software is available from our web server at http://alps.comp-phys.org/

  15. Bacterial composition and survival on Sahara dust particles transported to the European Alps

    Directory of Open Access Journals (Sweden)

    Marco eMeola

    2015-12-01

    Full Text Available Deposition of Sahara dust (SD particles is a frequent phenomenon in Europe, but little is known about the viability and composition of the bacterial community transported with SD. The goal of this study was to characterize SD-associated bacteria transported to the European Alps, deposited and entrapped in snow. During two distinct events in February and May 2014, SD particles were deposited and promptly covered by falling snow, thus preserving them in distinct ochre layers within the snowpack. In June 2014, we collected samples at different depths from a snow profile at the Jungfraujoch (Swiss Alps; 3621 m a.s.l.. After filtration, we performed various microbiological and physicochemical analyses of the snow and dust particles therein that originated in Algeria.Our results show that bacteria survive and are metabolically active after the transport to the European Alps. Using high throughput sequencing, we observed distinct differences in bacterial community composition and structure in SD-layers as compared to clean snow layers. Sporulating bacteria were not enriched in the SD-layers; however, phyla with low abundance such as Gemmatimonadetes and Deinococcus-Thermus appeared to be specific bio-indicators for SD. Since many members of these phyla are known to be adapted to arid oligotrophic environments and UV radiation, they are well suited to survive the harsh conditions of long-range airborne transport.

  16. Origin of polluted air masses in the Alps. An overview and first results for MONARPOP

    International Nuclear Information System (INIS)

    Kaiser, August

    2009-01-01

    The contribution of ZAMG to MONAROP consists of special weather forecasts to control the SOCs sampling procedure and of the analysis of the specific transport processes for SOCs, which is still in progress. In this paper, air pollutant transport into the Alps is demonstrated by examples of inorganic pollutants: Measurements of NO x and ozone provide evidence for air pollutant transport by local wind systems (valley and slope winds), especially at low elevated sites of the Alps. In addition, trajectory analyses for the high elevation sites demonstrate the importance of large scale synoptic air pollutant transport. The effects of these transport processes with different spatial and temporal scales are governed by the physical and chemical properties of the particular pollutant. First results for the high alpine MONARPOP stations show that air masses from east Europe influence mostly Sonnblick (Austria), whereas the influence of the Po basin is strongest at Weissfluhjoch (Switzerland). - Effects of meteorological transport processes on air pollution in the Alps are demonstrated by examples of inorganic pollutants and first conclusions for SOCs are drawn.

  17. Visit of Mme Anne-Marie Comparini, President of the Rhône-Alpes regional authority.

    CERN Document Server

    Patrice Loïez

    2001-01-01

    Photo 11: Signature of the Guests Book by Mr Jean Pépin, Président du Conseil général de l'Ain, on the occasion of the visit of Mrs Anne-Marie Comparini, Présidente du Conseil régional de Rhones-Alpes and Mr Ernest Nycollin, Président du Conseil général de la Haute-Savoie, at SM18. Here with Prof. Luciano Maiani, CERN Director General. Photo 18: Technicians and engineers of the Rhone-Alpes/CERN programme(PRAC) at SM18 on the occasion of the visit of Mrs Anne-Marie Comparini, Présidente du Conseil régional de Rhones-Alpes. From l. to r.:Prof. Luciano Maiani, Directeur General, CERN; Mr Ernest Nycollin, Président du Conseil général de la Haute-Savoie; Mrs Anne-Marie Comparini, Présidente du Conseil régional de Rhones-Alpes; Mr Jean Pépin, Président du Conseil général de l'Ain. Photo 20 : Mrs Anne-Marie Comparini, Présidente du Conseil régional de Rhones-Alpes during her visit at SM18 with technicians and engineers of the Rhone-Alpes/CERN programme (PRAC).

  18. Characterization of the interaction between Actinin-Associated LIM Protein (ALP) and the rod domain of α-actinin

    Science.gov (United States)

    Klaavuniemi, Tuula; Alho, Nanna; Hotulainen, Pirta; Kelloniemi, Annina; Havukainen, Heli; Permi, Perttu; Mattila, Sampo; Ylänne, Jari

    2009-01-01

    Background The PDZ-LIM proteins are a family of signalling adaptors that interact with the actin cross-linking protein, α-actinin, via their PDZ domains or via internal regions between the PDZ and LIM domains. Three of the PDZ-LIM proteins have a conserved 26-residue ZM motif in the internal region, but the structure of the internal region is unknown. Results In this study, using circular dichroism and nuclear magnetic resonance (NMR), we showed that the ALP internal region (residues 107–273) was largely unfolded in solution, but was able to interact with the α-actinin rod domain in vitro, and to co-localize with α-actinin on stress fibres in vivo. NMR analysis revealed that the titration of ALP with the α-actinin rod domain induces stabilization of ALP. A synthetic peptide (residues 175–196) that contained the N-terminal half of the ZM motif was found to interact directly with the α-actinin rod domain in surface plasmon resonance (SPR) measurements. Short deletions at or before the ZM motif abrogated the localization of ALP to actin stress fibres. Conclusion The internal region of ALP appeared to be largely unstructured but functional. The ZM motif defined part of the interaction surface between ALP and the α-actinin rod domain. PMID:19327143

  19. Glaciation's topographic control on Holocene erosion at the eastern edge of the Alps

    Directory of Open Access Journals (Sweden)

    J. L. Dixon

    2016-12-01

    Full Text Available What is the influence of glacial processes in driving erosion and uplift across the European Alps? It has largely been argued that repeated erosion and glaciation sustain isostatic uplift and topography in a decaying orogen. But some parts of the Alps may still be actively uplifting via deep lithospheric processes. We add insight to this debate by isolating the role of post-glacial topographic forcing on erosion rates. To do this, we quantify the topographic signature of past glaciation on millennial-scale erosion rates in previously glaciated and unglaciated catchments at the easternmost edge of the Austrian Alps. Newly measured catchment-wide erosion rates, determined from cosmogenic 10Be in river-borne quartz, correlate with basin relief and mean slope. GIS-derived slope–elevation and slope–area distributions across catchments provide clear topographic indicators of the degree of glacial preconditioning, which further correlates with erosion rates. Erosion rates in the easternmost, non-glaciated basins range from 40 to 150 mm ky−1 and likely reflect underlying tectonic forcings in this region, which have previously been attributed to recent (post 5 Ma uplift. By contrast, erosion rates in previously glaciated catchments range from 170 to 240 mm ky−1 and reflect the erosional response to local topographic preconditioning by repeated glaciations. Together, these data suggest that Holocene erosion across the Eastern Alps is strongly shaped by the local topography relict from previous glaciations. Broader, landscape-wide forcings, such as the widely debated deep mantle-driven or isostatically driven uplift, result in lesser controls on both topography and erosion rates in this region. Comparing our data to previously published erosion rates across the Alps, we show that post-glacial erosion rates vary across more than 2 orders of magnitude. This high variation in post-glacial erosion may reflect combined effects of direct

  20. Low-grade metamorphism in the eastern Southern Alps: Distribution, conditions, timing and implications for the tectonics of the Alps and NW Dinarides

    Science.gov (United States)

    Neubauer, Franz; Heberer, Bianca; Genser, Johann; Friedl, Getrude

    2014-05-01

    Based on 40Ar/39Ar dating of newly-grown syntectonic metamorphic white mica (sericite), we recognize for the first time the timing of Alpine low-grade metamorphism in the eastern part of the Southalpine unit: (1) A Silurian phyllite of Seeberg inlier located to the south of the Periadriatic fault yields a plateau age at c. 75 Ma suggesting a Late Cretaceous age of previously recognized low-grade (Rantitsch & Rainer, 2003) metamorphism. (2) Within the Tolmin nappe, four sericite plateau ages of mainly Middle Triassic volcanics are at c. 51 Ma (Early Eocene). The Late Cretaceous age in the Seeberg inlier is considered to record ductile deformation during formation of a retro-wedge related to the Eo-Alpine orogeny in the Austroalpine units in the Eastern Alps exposed north of the future Periadriatic fault. The Eocene age at the boundary of very low-grade to low-grade metamorphism in the Tolmin nappe (Rainer et al., 2009) relates to the emplacement of the Southalpine nappe complex onto the Dinarides and is contemporaneous with the initial ductile deformation in the Dinarides during Adria-directed shortening and formation of a siliciclastic flysch belt in front of the SW-directed growing fold-thrust belt (Placer, 2008). Similar rare Late Cretaceous and dominant Eocene ages within post-Variscan units are virtually more widespread in the Southalpine unit and Dinarides as considered before. These regions include the Collio basin (Feijth, 2002) and the Eder unit (Läufer et al., 1996) in the western and central Southern Alps, in the internal NW Dinarides (Borojević Šoštarić et al., 2012) and the Mid Bosnian Schist Mountains (Pamić et al., 2004) and Lim Paleozoic unit in the central Dinarides (Ilic et al., submitted). Consequently, the Southalpine unit and Dinarides were affected by two stages of metamorphism, Late Cretaceous (ca. 80 to 75 Ma) and Eocene (ca. 51 - 40 Ma), both stages are related to back-thrusting. The ages of metamorphism are different from those in the

  1. Postcollisional cooling history of the Eastern and Southern Alps and its linkage to Adria indentation

    Science.gov (United States)

    Heberer, Bianca; Reverman, Rebecca Lee; Fellin, Maria Giuditta; Neubauer, Franz; Dunkl, István; Zattin, Massimiliano; Seward, Diane; Genser, Johann; Brack, Peter

    2017-07-01

    Indentation of rigid blocks into rheologically weak orogens is generally associated with spatiotemporally variable vertical and lateral block extrusion. The European Eastern and Southern Alps are a prime example of microplate indentation, where most of the deformation was accommodated north of the crustal indenter within the Tauern Window. However, outside of this window only the broad late-stage exhumation pattern of the indented units as well as of the indenter itself is known. In this study we refine the exhumational pattern with new (U-Th-Sm)/He and fission-track thermochronology data on apatite from the Karawanken Mountains adjacent to the eastern Periadriatic fault and from the central-eastern Southern Alps. Apatite (U-Th-Sm)/He ages from the Karawanken Mountains range between 12 and 5 Ma and indicate an episode of fault-related exhumation leading to the formation of a positive flower structure and an associated peripheral foreland basin. In the Southern Alps, apatite (U-Th-Sm)/He and fission-track data combined with previous data also indicate a pulse of mainly Late Miocene exhumation, which was maximized along thrust systems, with highly differential amounts of displacement along individual structures. Our data contribute to mounting evidence for widespread Late Miocene tectonic activity, which followed a phase of major exhumation during strain localization in the Tauern Window. We attribute this exhumational phase and more distributed deformation during Adriatic indentation to a major change in boundary conditions operating on the orogen, likely due to a shift from a decoupled to a coupled system, possibly enhanced by a shift in convergence direction.

  2. Relationship between rainfall and shallow landslides in the southern Apuan Alps (Italy

    Directory of Open Access Journals (Sweden)

    R. Giannecchini

    2006-01-01

    Full Text Available The Apuan Alps region is one of the rainiest areas in Italy (more than 3000 mm/year, in which frequently heavy and concentrated rainfall occurs. This is particularly due to its geographical position and conformation: the Apuan chain is located along the northern Tuscan coast, close to the Ligurian Sea, and the main peaks reach almost 2000 m. In several cases, the storms that hit the area have triggered many shallow landslides (soil slip-debris flows, which exposed the population to serious risks (during the 19 June 1996 rainstorm about 1000 landslides were triggered and 14 people died. The assessment of the rainfall thresholds is very important in order to prepare efficient alarm systems in a region particularly dedicated to tourism and marble activities. With the aim of contributing to the landslide hazard evaluation of the southern Apuan Alps territory (upper Versilia area, a detailed analysis of the main pluviometric events was carried out. The data recorded at the main rain gauge of the area from 1975 to 2002 were analysed and compared with the occurrence of soil slips, in order to examine the relationship between soil slip initiation and rainfall. The most important rainstorms which triggered shallow landslides occurred in 1984, 1992, 1994, 1996, 1998 and 2000. Many attempts were made to obtain a possible correlation between rainfall parameters and the occurrence of soil slip phenomena and to identify the local rainfall threshold for triggering shallow landslides. A threshold for soil slip activity in terms of mean intensity, duration and mean annual precipitation (MAP was defined for the study area. The thresholds obtained for the southern Apuan Alps were also compared with those proposed by other authors for several regions in the world. This emphasized the high value of the rain threshold for shallow landslide activity in the Apuan area. The high threshold is probably also linked to the high mean annual precipitation and to the high

  3. End of the Little Ice Age in the Alps forced by industrial black carbon.

    Science.gov (United States)

    Painter, Thomas H; Flanner, Mark G; Kaser, Georg; Marzeion, Ben; VanCuren, Richard A; Abdalati, Waleed

    2013-09-17

    Glaciers in the European Alps began to retreat abruptly from their mid-19th century maximum, marking what appeared to be the end of the Little Ice Age. Alpine temperature and precipitation records suggest that glaciers should instead have continued to grow until circa 1910. Radiative forcing by increasing deposition of industrial black carbon to snow may represent the driver of the abrupt glacier retreats in the Alps that began in the mid-19th century. Ice cores indicate that black carbon concentrations increased abruptly in the mid-19th century and largely continued to increase into the 20th century, consistent with known increases in black carbon emissions from the industrialization of Western Europe. Inferred annual surface radiative forcings increased stepwise to 13-17 W⋅m(-2) between 1850 and 1880, and to 9-22 W⋅m(-2) in the early 1900s, with snowmelt season (April/May/June) forcings reaching greater than 35 W⋅m(-2) by the early 1900s. These snowmelt season radiative forcings would have resulted in additional annual snow melting of as much as 0.9 m water equivalent across the melt season. Simulations of glacier mass balances with radiative forcing-equivalent changes in atmospheric temperatures result in conservative estimates of accumulating negative mass balances of magnitude -15 m water equivalent by 1900 and -30 m water equivalent by 1930, magnitudes and timing consistent with the observed retreat. These results suggest a possible physical explanation for the abrupt retreat of glaciers in the Alps in the mid-19th century that is consistent with existing temperature and precipitation records and reconstructions.

  4. Soil mapping and classification in the Alps: Current state and future challenges

    Science.gov (United States)

    Baruck, Jasmin; Gruber, Fabian; Geitner, Clemens

    2014-05-01

    Soil is an essential, non-renewable resource, which fundamentally needs sustainable management. Soils in mountain regions like the Alps have a diverse small-scale distribution and they are characterized by a slow soil development and multilayer profiles. This is mainly caused by high process dynamics and harsh climate conditions. Therefore, soils are particularly vulnerable and require a sustainable management approach. Furthermore, the global change, especially the climate and land use change, leads to new demands on the soil. Thus, high-resolution spatial informations on soil properties are required to protect this resource and to consider its properties in spatial planning and decision making. In the Alpine region soil maps are mostly confined to small (mostly agriculture) areas. Especially, in higher altitudes of the Alps pedologic research and data collection are lacking. However, nowadays and in the future systematic soil mapping works are and will be no longer applied. Another methodical problem arises because each Alpine country has its own national soil mapping and classification system which are not adapted to Alpine areas. Therefore, appropriate methods of working practices for the Alpine region are mostly missing. The central aim of the research project "ReBo - Terrain Classification based on airborne laser scanning data to support soil mapping in the Alps", founded by the Autonomous Province of Bolzano - South Tyrol, is to develop and verify a concept, which allows the collection of soil data through an optimized interaction of soil mapping and geomorphometric analysis. The test sites are located in South Tyrol (Italy). The workflow shall minimise the required pedologic field work and shall provide a reliable strategy for transferring punctual soil informations into spatial soil maps. However, for a detailed analysis a systematic pedologic field work is still indispensable. As in the Alps reliable soil mapping and classification standards are lacking

  5. Possible environmental effects on the evolution of the Alps-Molasse basin system

    International Nuclear Information System (INIS)

    Schlunegger, F.; Rieke-Zapp, D.; Ramseyer, K.

    2007-01-01

    We propose three partly unrelated stages in the geodynamic evolution of the Alps and the sedimentary response of the Molasse Basin. The first stage comprises the time interval between ca. 35 and 20 Ma and is characterized by a high ratio between rates of crustal accretion and surface erosion. The response of the Molasse Basin was a change from the stage of basin underfill (UMM) to overfill (USM). Because the response time of erosional processes to crustal accretion and surface uplift lasts several millions of years, the orogen first experienced a net growth until the end of the Oligocene. As a result, the Molasse basin subsided at high rates causing the topographic axis to shift to the proximal basin border and alluvial fans to establish at the thrust front. During the Aquitanian, however, ongoing erosion and downcutting in the hinterland caused sediment discharge to the basin to increase and the ratio between the rates of crustal accretion and surface erosion to decrease. The result was a progradation of the dispersal systems, and a shift of the topographic axis towards the distal basin border. The second stage started at ca. 20 Ma at a time when palaeoclimate became more continental, and when the crystalline core became exposed in the orogen. The effect was a decrease in the erosional efficiency of the Swiss Alps and hence a reduction of sediment discharge to the Molasse Basin. We propose that this decrease in sediment flux caused the Burdigalian transgression of the OMM. We also speculate that this reduction of surface erosion initiated the modification of Alpine deformation from vertically- to mainly horizontally directed extrusion (deformation of the Southern Alps, and the Jura Mountains some Ma later). The third stage in the geodynamic development was initiated at the Miocene/Pliocene boundary. At that time, palaeoclimate possibly became wetter, which, in turn, caused surface erosion to increase relative to crustal accretion. This change caused the Alps to

  6. Hemin binding by Porphyromonas gingivalis strains is dependent on the presence of A-LPS.

    Science.gov (United States)

    Rangarajan, M; Aduse-Opoku, J; Paramonov, N A; Hashim, A; Curtis, M A

    2017-10-01

    Porphyromonas gingivalis is a Gram-negative black pigmenting anaerobe that is unable to synthesize heme [Fe(II)-protoporphyrin IX] or hemin [Fe(III)-protoporphyrin IX-Cl], which are important growth/virulence factors, and must therefore derive them from the host. Porphyromonas gingivalis expresses several proteinaceous hemin-binding sites, which are important in the binding/transport of heme/hemin from the host. It also synthesizes several virulence factors, namely cysteine-proteases Arg- and Lys-gingipains and two lipopolysaccharides (LPS), O-LPS and A-LPS. The gingipains are required for the production of the black pigment, μ-oxo-bisheme {[Fe(III)PPIX] 2 O}, which is derived from hemoglobin and deposited on the bacterial cell-surface leading to the characteristic black colonies when grown on blood agar. In this study we investigated the role of LPS in the deposition of μ-oxo-bisheme on the cell-surface. A P. gingivalis mutant defective in the biosynthesis of Arg-gingipains, namely rgpA/rgpB, produces brown colonies on blood agar and mutants defective in Lys-gingipain (kgp) and LPS biosynthesis namely porR, waaL, wzy, and pg0129 (α-1, 3-mannosyltransferase) produce non-pigmented colonies. However, only those mutants lacking A-LPS showed reduced hemin-binding when cells in suspension were incubated with hemin. Using native, de-O-phosphorylated and de-lipidated LPS from P. gingivalis W50 and porR strains, we demonstrated that hemin-binding to O-polysaccharide (PS) and to the lipid A moiety of LPS was reduced compared with hemin-binding to A-PS. We conclude that A-LPS in the outer-membrane of P. gingivalis serves as a scaffold/anchor for the retention of μ-oxo-bisheme on the cell surface and pigmentation is dependent on the presence of A-LPS. © 2017 The Authors. Molecular Oral Microbiology Published by John Wiley & Sons Ltd.

  7. Ecology of some mire and bog plant communities in the Western Italian Alps

    Directory of Open Access Journals (Sweden)

    Giorgio BUFFA

    2003-02-01

    Full Text Available During a mire vegetation study, conducted mainly in the subalpine-alpine sector of the Western Italian Alps, the ecology of several plant communities and numerous moss species of this kind of vegetation was evaluated. The study area covered the Piedmontese sector of the Graian Alps, the eastern sector of the Aosta Valley as well as certain localities of the Pennine Alps, the Canavese district and the Maritime Alps. They have a rocky substratum representative of the various regional lithologies and include the main sectors characterised by the highest precipitation. Three hundred and twenty two relevées were made using the phytosociological method and the pH and the conductivity of the water table and its depth were measured directly. Cluster Analysis allowed a classification of the samples and the identification of various groups of plant communities. Ordination performed by DCA and CCA allowed us to identify the ecological features of the various plant communities by using the values of the main environmental parameters, measured directly in the field, and certain climatic parameters (altitude and mean annual precipitation available. The use of climatic parameters is an important result for identifying communities which show greater oceanicity, something that is underlined also by the presence of indicator species such as Sphagnum papillosum and S. subnitens. Furthermore the communities are arranged in a "poor-rich" gradient, and are also profoundly influenced by depth to water table which is inversely correlated to the pH. Therefore we find certain kinds of communities all with a very low water table and which are little affected by its chemistry. Other groups share the fact that the water table is outcropping or near the surface and are distinguishable for their pH values and conductivity. We discuss the different response of the bryophytes and vascular plants of these communities to the environmental parameters considered, in light of their

  8. Palaeoclimate records 60-8 ka in the Austrian and Swiss Alps and their forelands

    Science.gov (United States)

    Heiri, Oliver; Koinig, Karin A.; Spötl, Christoph; Barrett, Sam; Brauer, Achim; Drescher-Schneider, Ruth; Gaar, Dorian; Ivy-Ochs, Susan; Kerschner, Hanns; Luetscher, Marc; Moran, Andrew; Nicolussi, Kurt; Preusser, Frank; Schmidt, Roland; Schoeneich, Philippe; Schwörer, Christoph; Sprafke, Tobias; Terhorst, Birgit; Tinner, Willy

    2014-12-01

    The European Alps and their forelands provide a range of different archives and climate proxies for developing climate records in the time interval 60-8 thousand years (ka) ago. We review quantitative and semi-quantitative approaches for reconstructing climatic variables in the Austrian and Swiss sector of the Alpine region within this time interval. Available quantitative to semi-quantitative climate records in this region are mainly based on fossil assemblages of biota such as chironomids, cladocerans, coleopterans, diatoms and pollen preserved in lake sediments and peat, the analysis of oxygen isotopes in speleothems and lake sediment records, the reconstruction of past variations in treeline altitude, the reconstruction of past equilibrium line altitude and extent of glaciers based on geomorphological evidence, and the interpretation of past soil formation processes, dust deposition and permafrost as apparent in loess-palaeosol sequences. Palaeoclimate reconstructions in the Alpine region are affected by dating uncertainties increasing with age, the fragmentary nature of most of the available records, which typically only incorporate a fraction of the time interval of interest, and the limited replication of records within and between regions. Furthermore, there have been few attempts to cross-validate different approaches across this time interval to confirm reconstructed patterns of climatic change by several independent lines of evidence. Based on our review we identify a number of developments that would provide major advances for palaeoclimate reconstruction for the period 60-8 ka in the Alps and their forelands. These include (1) the compilation of individual, fragmentary records to longer and continuous reconstructions, (2) replication of climate records and the development of regional reconstructions for different parts of the Alps, (3) the cross-validation of different proxy-types and approaches, and (4) the reconstruction of past variations in climate

  9. Cyclostratigraphic calibration of cretaceous magnetic polarity events (Cismon, Southern Alps, Italy)

    Science.gov (United States)

    Mayer, H.

    1994-01-01

    In an introductory section the problems of constructing a geologic time scale and the role of magnetic reversals and Milankovitch cycles in geochronology are outlined. Results of a detailed cyclostratigraphic and magnetostratigraphic study of the Valanginian/Hauterivian part of the pelagic limestone section at Cismon in the Southern Alps are presented and used in conjunction to estimate the duration of magnetic subchrons between CM10N and CM8. The new estimates are shorter than in most published time scales by a factor of two to three. More research along these lines may make a revision of the Early Cretaceous time scale necessary. ?? 1994 International Association for Mathematical Geology.

  10. Stars in the Silurian sky: Echinoderm holdfasts from the Carnic Alps, Austria

    Energy Technology Data Exchange (ETDEWEB)

    Ferretti, A.; Ausich, W.I.; Corradini, C.; Corriga, M.G.; Schoenlaub, H.P.

    2016-07-01

    A small collection of echinoderm holdfasts from the Ludlow Cardiola Formation of the Carnic Alps (Austria) contains a wide range of morphologies as a response of environmental adaptation. In general, the holdfasts have a globous and massive dome-like profile with several processes arranged in a sub-radial disposition, so to create a sort of ‘star-like’ outline. A small central depression is common but not present on all specimens. The distinctive holdfasts are preserved in an iron-rich phase, documenting a substitution that has also affected other non-echinoderm calcareous material. (Author)

  11. Lithospheric architecture of the South-Western Alps revealed by multiparameter teleseismic full-waveform inversion

    Science.gov (United States)

    Beller, S.; Monteiller, V.; Operto, S.; Nolet, G.; Paul, A.; Zhao, L.

    2018-02-01

    The Western Alps, although being intensively investigated, remains elusive when it comes to determining its lithospheric structure. New inferences on the latter are important for the understanding of processes and mechanisms of orogeny needed to unravel the dynamic evolution of the Alps. This situation led to the deployment of the CIFALPS temporary experiment, conducted to address the lack of seismological data amenable to high-resolution seismic imaging of the crust and the upper mantle. We perform a 3-D isotropic full-waveform inversion (FWI) of nine teleseismic events recorded by the CIFALPS experiment to infer 3-D models of both density and P- and S-wave velocities of the Alpine lithosphere. Here, by FWI is meant the inversion of the full seismograms including phase and amplitude effects within a time window following the first arrival up to a frequency of 0.2 Hz. We show that the application of the FWI at the lithospheric scale is able to generate images of the lithosphere with unprecedented resolution and can furnish a reliable density model of the upper lithosphere. In the shallowest part of the crust, we retrieve the shape of the fast/dense Ivrea body anomaly and detect the low velocities of the Po and SE France sedimentary basins. The geometry of the Ivrea body as revealed by our density model is consistent with the Bouguer anomaly. A sharp Moho transition is followed from the external part (30 km depth) to the internal part of the Alps (70-80 km depth), giving clear evidence of a continental subduction event during the formation of the Alpine Belt. A low-velocity zone in the lower lithosphere of the S-wave velocity model supports the hypothesis of a slab detachment in the western part of the Alps that is followed by asthenospheric upwelling. The application of FWI to teleseismic data helps to fill the gap of resolution between traditional imaging techniques, and enables integrated interpretations of both upper and lower lithospheric structures.

  12. Background and triggered microseismicity in the Alpine Fault zone, central Southern Alps, New Zealand

    Science.gov (United States)

    Boese, C. M.; Stern, T. A.; Smith, E. G.; Townend, J.; Henderson, M.

    2010-12-01

    The Alpine Fault is a 460 km-long continental transform fault that bounds the western edge of the Southern Alps and constitutes the primary structure accommodating Pacific-Australia relative plate motion in the central South Island. Paleoseismic evidence suggests that large earthquakes (MW~7.9) occur every 200-400 years and that the central Alpine Fault last ruptured in 1717 AD. In historic times, however, there have been no large earthquakes and the central section of the Alpine Fault exhibits particularly low levels of seismicity above magnitude ML=2. This central portion of the fault is associated with the highest rates of dip-slip faulting (~10 mm/yr) and hanging-wall uplift (6-9 mm/yr). Previous geological and geophysical studies have suggested that large volumes of fluid are present in the rapidly exhumed crustal section immediately to the east of the central Alpine Fault. The Southern Alps Microearthquake Borehole Array (SAMBA) of 11 short-period seismometers installed in 1-100 m-deep boreholes was established in early 2009. SAMBA extends for 50 km along the Alpine Fault between the Whataroa and Karangarua Rivers and recorded ~1300 earthquakes of magnitude -0.5 SAMBA in the central Southern Alps. Most microearthquakes occur at depths shallower than 10 km and exhibit predominantly strike-slip focal mechanisms. The observations reinforce previous results indicating very low levels of seismicity northeast of the Whataroa River, a possible site of future deep drilling. The highest daily number of events recorded so far occurred after the MW=7.8 Dusky Sound earthquake of 15 July 2009, which ruptured the subduction interface beneath Fiordland and offshore, approximately 360 km southwest of the center of the SAMBA array. The triggered microearthquakes occurred in the middle of a pre-existing cluster. After five days, the rate of seismicity returned to the previous level. Map of the central Southern Alps showing the national station network (GeoNet, black triangles

  13. methanization development and air quality. Bibliographical synthesis and working perspectives in Rhone-Alpes 2016

    International Nuclear Information System (INIS)

    2016-06-01

    After a recall of a context which promotes the development of the methanization sector, and in order to address social acceptance issues related to methanization installations, this report aims at proposing a synthesis of existing documents related to methanization and its possible interactions with air quality. A first part briefly describes a methanization unit. The second part proposes an overview of the situation of projects in the Rhone-Alpes region. The third part proposes an overview of knowledge regarding potential impacts on air quality and greenhouse gas emissions

  14. Seasonal evaluation of serumal Ca, P and ALP of slaughtered cattle in Tabriz abattoir

    Directory of Open Access Journals (Sweden)

    A.P Rezaei-Saber

    2008-08-01

    Full Text Available Increasing knowledge of metabolic disorders and prevention of any prduction decrease is beneficial in animal breeding. Problems related to calcium and phosphorus deficiency in high producing animals are among the most important metabolic disorders with disease such as osteomalacia, rickets, milk fever, pos parturition hemoglobinuria and reproductive disorders named as the metabolic complications. This study was conducted on non pregnant crossbreed dairy cattle. In the middle of each season with daily referral to the abattoir, blood samples were collected in veneject tubes and after transfer to the laboratory, the serumic levels of Ca, P and ALP were measured by spectrophotometry. One hundred samples for each season and a total of 400 samples were studied. The mean serumic levels of Ca, P and ALP were 8.83±0.02 mg/dl, 3.88±0.07 mg/dl, 163.4±0.8 Iu/lit; 9.05±0.03mg/dl, 4.19±0.01mg/dl, 240.7±1.2 Iu/lit; 9.03±0.07 mg/dl, 5.33±0.02mg/dl, 185.06±2.3 Iu/lit and 9.33±0.09 mg/dl, 5.74±0.08 mg/dl, 230.03±7.4 Iu/lit, in the spring, summer, autumn and winter respectively. Considering the normal Ca, P and ALP values in cattle, 6.3% and 83% of cases had Ca and P deficiency respectively in the spring, 80% of cases had subclinical phosphorus deficiency in the summer, 7.3% of cases had subclinical phosphorus deficiency in the autumn and 9.45% and 7.36% of cases had Ca deficiency and ALP elevation respectively in the winter. The significant decrease in Ca and P levels in the spring and P levels in the summer (p

  15. ALP gene expression in cDNA samples from bone tissue engineering using a HA/TCP/Chitosan scaffold

    Science.gov (United States)

    Stephanie, N.; Katarina, H.; Amir, L. R.; Gunawan, H. A.

    2017-08-01

    This study examined the potential use of hydroxyapatite (HA)/tricalcium phosphate (TCP)/Chitosan as a bone tissue engineering scaffold. The potential for using HA/TCP/chitosan as a scaffold was analyzed by measuring expression of the ALP osteogenic gene in cDNA from bone biopsies from four Macaque nemestrina. Experimental conditions included control (untreated), treatment with HA/TCP 70:30, HA/TCP 50:50, and HA/TCP/chitosan. cDNA samples were measured quantitively with Real-Time PCR (qPCR) and semi-quantitively by gel electrophoresis. There were no significant differences in ALP gene expression between treatment subjects after two weeks, but the HA/TCP/chitosan treatment gave the highest level of expression after four weeks. The scaffold using the HA/TCP/chitosan combination induced a higher level of expression of the osteogenic gene ALP than did scaffold without chitosan.

  16. PENGARUH PEMBERIAN SUBKRONIK EKSTRAK KELOPAK BUNGA ROSELLA (Hibiscus Sabdariffa L. TERHADAP KADAR SGPT SGOT DAN ALP

    Directory of Open Access Journals (Sweden)

    Nurkhasanah Nurkhasanah

    2016-11-01

    Full Text Available Roselle (Hibiscus sabdariffa L. has been known as traditional medicinal plants. It needed to evaluate the safety of roselle extract on long-term oral administration. The research aimed to determine the savety of ethanolic extract of roselle calyx. Subchronic toxicity study of ethanolic extract of roselle calyx had been carried out on 60 Sprague Dawleys (SD rats for 28 days. The roselle extract was administered orally every day, with doses of 50,100 and 200 mg/kgBW. There are 2 satellite groups, kept for another 14 days after the treatment in order to detect a delayed occurrence of toxic effect. Satellite group was given extract 200 mg/kgBW for 28 days and followed aquadest treatment for 14 days. At the end of experiment the blood was collected for meansuring SGPT, SGOT and ALP activity. The result showed that treatment of roselle calyx extract had no significant changes in SGPT SGOT, ALP activity. The delayed effect was not also observed. The ethanolic extract of roselle calyx didn’t show toxic effects on the liver on subchronic administration.

  17. Link between concentrations of sediment flux and deep crustal processes beneath the European Alps.

    Science.gov (United States)

    Garefalakis, Philippos; Schlunegger, Fritz

    2018-01-09

    Large sediment fluxes from mountain belts have the potential to cause megafans to prograde into the neighbouring sedimentary basins. These mechanisms have been documented based from numerical modelling and stratigraphic records. However, little attention has been focused on inferring temporal changes in the concentrations of supplied sediment from coarse-grained deposits. Here, we extract changes of this variable in the field from a Late Oligocene, c. 4 km-thick suite of fluvial conglomerates situated in the North Alpine foreland basin, which evolved in response to the tectonic and erosional history of the Alps. We measure a decrease in channel depths from >2 m to 20 cm from the base to the top of the suite. These constraints are used to calculate an increase in fan surface slopes from 1.0° based on the Shields criteria for sediment entrainment. We combine slope and bulk grain size data with the Bagnold equation for sediment transport to infer higher concentrations of the supplied sediment. We use these shifts to propose a change towards faster erosion and a steeper landscape in the Alpine hinterland, driven by mantle-scale processes beneath the Alps.

  18. Impacts of climatic change on water and associated economic activities in the Swiss Alps

    Science.gov (United States)

    Beniston, Martin

    2012-01-01

    SummaryThe European Alps are one region of the world where climate-driven changes are already perceptible, as exemplified by the general retreat of mountain glaciers over past decades. Temperatures have risen by up to 2 °C since 1900 particularly at high elevations, a rate that is roughly three times the global-average 20th century warming. Regional climate models suggest that by 2100, winters in Switzerland may warm by 3-5 °C and summers by 6-7 °C according to greenhouse-gas emissions scenarios, while precipitation is projected to increase in winter and sharply decrease in summer. The impacts of these levels of climatic change will affect both the natural environment and a number of economic activities. Alpine glaciers may lose between 50% and 90% of their current volume and the average snowline will rise by 150 m for each degree of warming. Hydrological systems will respond in quantity and seasonality to changing precipitation patterns and to the timing of snow-melt in the Alps, with a greater risk of flooding during the spring and droughts in summer and fall. The direct and indirect impacts of a warming climate will affect key economic sectors such as tourism, hydropower, agriculture and the insurance industry that will be confronted to more frequent natural disasters. This paper will thus provide an overview of the current state of knowledge on climatic change and its impacts on the Alpine world.

  19. An estimate of the glacier ice volume in the Swiss Alps

    Science.gov (United States)

    Farinotti, Daniel; Huss, Matthias; Bauder, Andreas; Funk, Martin

    2009-08-01

    Changes in glacier volume are important for questions linked to sea-level rise, water resource management, and tourism industry. With the ongoing climate warming, the retreat of mountain glaciers is a major concern. Predictions of glacier changes, necessarily need the present ice volume as initial condition, and for transient modelling, the ice thickness distribution has to be known. In this paper, a method based on mass conservation and principles of ice flow dynamics is applied to 62 glaciers located in the Swiss Alps for estimating their ice thickness distribution. All available direct ice thickness measurements are integrated. The ice volumes are referenced to the year 1999 by means of a mass balance time series. The results are used to calibrate a volume-area scaling relation, and the coefficients obtained show good agreement with values reported in the literature. We estimate the total ice volume present in the Swiss Alps in the year 1999 to be 74 ± 9 km 3. About 12% of this volume was lost between 1999 and 2008, whereas the extraordinarily warm summer 2003 caused a volume loss of about 3.5%.

  20. The crossing of the Alps of Gerbert of Aurillac during the 984 AD: climatic implications

    Science.gov (United States)

    Mariani, Luigi

    2016-05-01

    In a letter to Miró Bonfill (Bishop of Girona) sent in march-april 984, Gerbert d'Aurillac wrote that "if you want to write something to us, please address your correspondence to Reims until the first of November or to Rome from December 25". This envisages a journey from Reims to Rome in the period 1th November - 25 December (Sigismondi, 2009). In those times the road normally used to reach Rome from Reims was the Via Francigena which crosses the Alps at the Great St Bernard pass. This pass is a privileged transit point through the Alps since ancient times as stated by the old name "Col de Mons Joux" that remembers the Jupiter's Pennino temple built along the old Roman road. The crossing point is at 2437 m asl, which from autumn to spring gives a significant risk of crossing failures due to snowfalls. The trip of Gerbert of Aurillac leads us to the general topic of the documentary sources of the crossings of the Alpine passes. The trust of Gerbert of Aurillac in the respect of the predefined travel time testifies a low perception of the risk of the transit of the Great St Bernard. This reinforces the evidence of an unusual mildness of Medieval period in Europe coming from many other documentary sources.

  1. Photosynthetic temperature adaptation of Pinus cembra within the timberline ecotone of the Central Austrian Alps.

    Science.gov (United States)

    Wieser, Gerhard; Oberhuber, Walter; Walder, Lisa; Spieler, Daniela; Gruber, Andreas

    2010-04-01

    Temperature is suggested to determine the upper limit of tree life. Therefore, future climate warming may be of importance for tree distribution within the European Alps, where low temperatures limit carbon metabolism.We focused on the effects of air and soil temperature on net photosynthesis (P(n)) of Pinus cembra an evergreen climax species of the timberline ecotone of the Central Austrian Alps. Light response and temperature response curves were estimated along an altitudinal gradient ranging from the forest limit up to the krummholz limit in both summer and fall.In general, P(n) was significantly lower in fall as compared to summer. Nevertheless, independent from season mean P(n) values tended to increase with elevation and were positively correlated with root zone temperatures. The specific leaf area by contrast declined with increasing elevation. Furthermore, the temperature optimum of net photosynthesis declined with increasing elevation and was positively correlated with the mean maximum air temperature of the 10 days prior the date of measurement.Thus, our findings appear to reflect a long-term adaptation of the photosynthetic apparatus of Pinus cembra to the general temperature conditions with respect to elevation combined with a short term acclimation to the prevailing temperature regime.

  2. A regional reconstruction of debris-flow activity in the Northern Calcareous Alps, Austria

    Science.gov (United States)

    Procter, Emily; Bollschweiler, Michelle; Stoffel, Markus; Neumann, Mathias

    2011-09-01

    Dendrogeomorphic dating of historical debris-flow events is a highly valuable tool for improving historical records in the field of natural hazard management. Previous dendrogeomorphic investigations generally have focused on case studies of single torrents; however, regional investigations may offer a more accurate reconstruction of regional patterns of activity and therefore may have an advantage over individual cases. The aim of the study is to provide a regional reconstruction of debris-flow events for a site in the Northern Calcareous Alps of western Austria (Gamperdonatal, Vorarlberg) and to document spatial and temporal morphological changes in individual and neighboring torrents. Analysis of 442 trees (268 Pinus mugo ssp. uncinata, 164 Picea abies, and 10 Abies alba) allowed identification of 579 growth disturbances corresponding to 63 debris-flow events since A.D. 1839. The majority of growth disturbances were in the form of growth suppression or release (76%) owing to the nature of both the deposited material and the process characteristics. Regional patterns of event frequency indicated a paucity of activity in the early to mid-twentieth century and increased activity since A.D. 1948, whereby large events were followed by subsequent years of continued activity of smaller magnitude. Patterns of frequency could be attributed primarily to spatiotemporal changes in channel morphology, but may also be reflective of changes in transport conditions within the valley. This study provides the first regional investigation in the Austrian Alps and contributes to the documentation of tree responses to geomorphic disturbances in calcareous material.

  3. Two new pioneer communities of Sorbus aucuparia and Sorbus aria in the southern Julian Alps

    Directory of Open Access Journals (Sweden)

    Dakskobler Igor

    2016-06-01

    Full Text Available In the southern Julian Alps we described two communities whose tree layer is dominated by species from the genus Sorbus and noted two successional stages in the overgrowing of abandoned agricultural land (pastures, hay meadows. In the secondary succession on former subalpine pastures above the alp Planina Razor und under the Breginjski Stol ridge, where potential natural vegetation consists of subalpine beech forest, dwarf pine has been overgrown with mountain ash (Sorbus aucuparia whose stands are classified into the new association Rhododendro hirsuti-Sorbetum aucupariae. Whitebeam (Sorbus aria has established itself on steep former hay meadows in the belt of altimontane beech forests under Mts. Jalovnik and Krikov Vrh, on gullied slopes on mixed geological bedrock dominated by chert, and these stands are classified into the association Calamagrostio arundinaceae-Sorbetum ariae. While occupying only small areas these two pioneer stages, as the sites of some rare or protected species, are nevertheless important biotopes and play a vital role in protection against avalanches.

  4. A key to larvae of species belonging to the genus Diamesa from Alps and Apennines (Italy

    Directory of Open Access Journals (Sweden)

    Bruno Rossaro

    2015-07-01

    Full Text Available A key to species belonging to the genus Diamesa Meigen, 1835 (Diptera, Chironomidae from the Alps and Apennines (Italy is presented using characters observable in the fourth-instar larva. The larvae are separated on the basis of qualitative and quantitative characters. At present fifteen species from the Italian Alps are described in all three life stages, but only twelve species groups can be separated as larvae. The separation is based on the length and thickness of anal setae, antennal ratio, head capsule color and few other characters of the labrum and mentum. The shape of mental and mandibular teeth is still a valid taxonomic character, but unfortunately these characters can be rarely used because teeth are often excessively worn in samples collected in the field. Quantitative characters show variability within each species, differing according to the duration of larval development and must be used with caution. The species groups which can be separated in the larval stage are: the dampfi group, which includes D. dampfi and D. permacra, the latitarsis group including D. modesta and D. latitarsis, the zernyi group including D. zernyi and D. vaillanti. The species within each of these groups at present cannot be separated. D. starmachi, D. steinboecki, D. goetghebueri, D. bertrami, D. aberrata, D. incallida, D. cinerella, D. tonsa and D. insignipes can be separated from all the other known species in larval stage.

  5. Atmospheric Flow Patterns Around the Southern Alps of New Zealand and Implications for Paleoaltimetry

    Science.gov (United States)

    Wheeler, L. B.; Galewsky, J.

    2017-11-01

    The development of relief may generate leeside rain shadows where precipitation δ18O values are lower due to rainout on the windward side. The magnitude of lowering in paleo-δ18O sampled from the leeside of a mountain range should, at least, in principle, be related to the elevation of the mountain range. In order for leeside proxies to record the highest elevations, the majority of air masses need to travel up and over the ridge crest before raining out on the leeside. If atmospheric flow patterns around the mountain range are dominated by flow deflection, air masses that reach the leeside are less likely to record the highest elevations. Using the Weather Research and Forecasting model and Hybrid Single-Particle Lagrangian Integrated Trajectory model, we demonstrate that modern atmospheric flow patterns in the Southern Alps of New Zealand are not dominated by flow deflection. The lack of flow deflection around the Southern Alps and the relatively low relief throughout the uplift history supports the use of leeside isotope records to constrain the timing of uplift, and that uplift likely occurred 5 Ma based on leeside isotope records. In contrast, orogens that are characterized by high elevations and strong flow deflection, like the Sierra Nevada of California, may not be good candidates for leeside isotope-based paleoaltimetry studies. Ideal candidates for such studies should be characterized by relatively low elevations, low atmospheric flow deflection, and relatively low relief throughout the period of uplift.

  6. Slope instabilities occurred at high elevation in the Italian Alps in 2016: regional landscape fragility and meteorological framework

    Science.gov (United States)

    Chiarle, Marta; Cat Berro, Daniele; Mercalli, Luca; Mortara, Giovanni; Nigrelli, Guido

    2017-04-01

    The Italian side of the Alps includes some of the most fascinating and, at the same time, fragile landscapes of the European Alps (e.g. the Mont Blanc Massif, the Matterhorn and the Dolomites). The relatively low latitude and the prevalence of the exposure to the South, together with a decrease of approximately 10% of the precipitation in the last 100 years, have exacerbated more than in other parts of the European Alps the consequences of climate warming on the cryosphere. It is a fact that many Italian ridges extend in the lower fringe of the permafrost and that glacier shrinkage since the end of the Little Ice Age has been dramatic, up to the almost complete deglaciation of most of the south-western and eastern Italian Alps. In view of this, and of the fact that 2016 has been declared as the warmest year on record globally, we analyze the natural instability events that occurred in 2016 in the Italian Alps at high elevation (> 1500 m a.s.l.). More than 20 events have been reported in the period March-October, mostly in the western and eastern Italian Alps. Rockfalls significantly outweigh other types of instabilities, but ice falls, glacial outburst floods and debris flows have also been documented. The properties and spatial occurrence of these instability processes will be discussed, as well as the synoptic meteorological context in which they developed, in order to contribute to the discussion on how ongoing environmental changes are influencing the response of glaciated and recently deglaciated slopes to meteorological forcing, and thus hazard occurrence.

  7. An original methodology to compute SWE of mountainous regions: insight from the Italian Eastern Alps

    Science.gov (United States)

    Cianfarra, Paola; Valt, Mauro

    2013-04-01

    In this work we present an original methodology for the evaluation of the Snow Water Equivalent (SWE) from regions covering an area of about 5000 km2. The methodology has been tuned and set up over the Italian Eastern Alps using MODIS satellite images (http://rapidfire.sci.gsfc.nasa.gov/realtime/) and data derived from the monitoring network of the local Snow Avalanche Services. The methodology includes: i) the identification of the Snow Covered Area (SCA) from satellite images; ii) the near real-time computation of the snow depth (Hs) mean values from the available monitoring networks; iii) the derivation of the mean snow density by season and by depth interval. Satellite image processing for the computation of the SCA has been tuned up specifically for the Eastern Alps region and includes the computation of the Normalised Difference Snow Index and a threshold value ad hoc for the investigated area; the use of a Decision Tree. The identification of the most effective (the best) threshold value is the most sensitive part of the image processing because this threshold depends on many factors such as the local physiographic setting, the altitude intervals, the shadows, and the vegetation. By comparing the obtained SCA map with the digital elevation model of the investigated region it is possible to derive the snow covered area by altitude intervals. Italian Snow Avalanche Services control networks for the monitoring of the Hs over their competence. Those networks are based on real time automatic measurement systems or snow field where manual measurement are daily performed every morning. From those measurements are then derived mean Hs values for altitude interval (every 300 m starting from 600 m elevation in the Eastern Italian Alps). The altitude intervals are chosen based on the physiographic setting and the local climate of the investigated region. Snow density values are derived from long time-series data base where measurements from the Italian Alps are

  8. Permafrost detection in the headwalls of receding glaciers at the Dachstein Massif, Northern Calcareous Alps, Austria

    Science.gov (United States)

    Rode, Matthias; Gitschthaler, Christoph; Schnepfleitner, Harald; Kellerer-Pirklbauer, Andreas; Sass, Oliver

    2014-05-01

    The Northern Calcareous Alps cover a large area of the Austrian Alps forming a boundary zone between the Alpine Foreland to the north and the crystalline Central Alps to the south. Generally, climate in this area is more maritime compared to the mountain ranges further south. Few small glaciers are to be found mostly on north-facing slopes. The Northern Calcareous Alps reach maximum elevations of about 3000 m asl. Some of highest summits are to be found are located in the Dachstein Massif reaching 2995 m asl (47° 28' 32″ N, 13° 36' 23″ E). Occurrence, thickness and thermal regime of permafrost at this mountain massif are widely unknown and knowledge is based on simulations only. In contrast, the glaciation changes at this mountain massif (e.g. Schladminger and Hallstätter glaciers) have been well documented for decades. Within the framework of the research project ROCKING ALPS - dealing with frost weathering and rockfall in alpine regions - knowledge of permafrost distribution in the headwalls surrounding the receding glaciers is substantial to understand rock decay. For this reason, several techniques have been applied in order to detect bedrock permafrost. During the winter of 2012 22 i-buttons (temperature sensors) were attached to rock walls with different orientations but at similar elevations (2600-2700 m asl). Most of these sites were later covered by an insulating winter snow cover therefore allowing the calculation of the base temperature of the winter snow cover (BTS). These BTS data have been used as a first indicator of permafrost presence. In selected rock walls of several mountains in the massif - Koppenkarstein (2863 m asl), Dirndln (2829 m asl) and Gjaidstein (2794 m asl) - additional 2D-geoelectric surveys (five ERT profiles with a length of 100 m and 2 m electrode spacing) were measured in summer 2013. The high resistivities (> 50.000 ohm.m) at about 1.5 m depth and deeper strongly suggest permafrost existence inside the bedrock at all

  9. Industrial applications of solar energy: deserts, seas, the Alps; Les applications industrielles de l'energie solaire: du desert aux Alpes en passant par la mer

    Energy Technology Data Exchange (ETDEWEB)

    Allani, Y.

    2008-07-01

    In this set of presentation slides, after a review of worldwide energy resources the author presents his innovative technical solution aimed at contributing to future energy supply. An extra-flat solar concentrator was developed to produce industrial steam in the temperature range 150 to 300 {sup o}C. A prototype was operated on the site of the Federal Institute of Technology (EPFL) in Lausanne, Switzerland, for power generation at 12 kW{sub el}. In Ras al Khaimah, United Arab Emirates, the concept of the so-called Solar Island is to be tested. Construction work is underway. A floating circular platform will be equipped with parallel rows of extra-flat solar concentrators. The platform will rotate to follow the sun apparent movement and enhance the power output of the concentrators. A second project is presented that should be realised in the Swiss Alps. In this case the extra-flat concentrators will be mounted on existing steel constructions that prevent snow avalanches on steep grounds. The basic technical data of the two projects are given.

  10. Purification of barley dimeric α-amylase inhibitor-1 (BDAI-1) and avenin-like protein-a (ALP) from beer and their impact on beer foam stability.

    Science.gov (United States)

    Iimure, Takashi; Kihara, Makoto; Sato, Kazuhiro; Ogushi, Kensuke

    2015-04-01

    Foam stability is a key factor of beer quality for consumers and brewers. Recent beer proteome analyses have suggested that barley dimeric α-amylase inhibitor-1 (BDAI-1) and avenin-like protein-a (ALP) derived from barley are important for beer foam stability. In this study, BDAI-1 and ALP were purified from a Japanese commercial beer sample using salt precipitation and column chromatography. The purification level was verified using two-dimensional gel electrophoresis, mass spectrometry, and database searches. Purified BDAI-1 and ALP were added to a beer sample to compare the foam stability to that of a control beer sample. As a result, beer foam stability was significantly improved by BDAI-1 but not by ALP, thereby suggesting that BDAI-1 affects beer foam stability whereas ALP does not. Copyright © 2014 Elsevier Ltd. All rights reserved.

  11. The Origin of The Piz Terri-Lunschania zone (Central Alps, Switzerland)

    Science.gov (United States)

    Galster, Federico; Stockli, Daniel

    2017-04-01

    The Piz Terri-Lunschania zone (PTLZ) represents a band of metasedimentary rocks embedded in a crucial knot at the NE border of the Lepontine dome, at the intersection of the Gotthard, Lucomagno, Simano, Adula and Grava nappes. Its origin and its position in the tectonostratigraphy of the Central Alps are still not completely understood. A better understanding of this sedimentary zone and its tectonic position could shed lights on the Helvetic-Penninic connection and facilitate the disentanglement of the Lepontine dome tectonics. In this study we combine structural and stratigraphic observations with detrital zircon (DZ) and detrital rutile (DR) U-Pb geochronology as well as mineral trace element data from Permian, Triassic and Jurassic sandstones. We compare these data with those from adjacent tectonic units and coeval strata in other portions of the Alpine chain. Maximal depositional ages, abrupt changes in provenances and stratigraphic correlations based on new DZ and DR U-Pb and trace element data allow for a better understanding of the sedimentary evolution of the Terri basin and its palaeogeographic position along the northern margin of the Alpine Tethys. In particular the DZ U-Pb signatures, with its abundant 260-280 Ma zircons and the scarcity of 290-350 Ma zircons, corroborates an Ultra-Adula origin of the PTLZ as proposed by Galster et al (2010; 2012) based on stratigraphic arguments and reinforces the notion of a Briançonnais influence on the stratigraphic record of this complex zone, a fact that has important tectonic and Palaeogeographic implications. Galster F, Cavargna-Sani M, Epard J-L, Masson H (2012) New stratigraphic data from the Lower Penninic between the Adula nappe and the Gotthard massif and consequences for the tectonics and the paleogeography of the Central Alps. Tectonophysics 579:37-55. doi: 10.1016/j.tecto.2012.05.029 Galster F, Epard J-L, Masson H (2010) The Soja and Luzzone-Terri nappes: Discovery of a Briançonnais element below the

  12. Late Pleistocene - Holocene surface processes and landscape evolution in the central Swiss Alps

    Science.gov (United States)

    Boxleitner, Max; Musso, Alessandra; Waroszewski, Jarosław; Malkiewicz, Małgorzata; Maisch, Max; Dahms, Dennis; Brandová, Dagmar; Christl, Marcus; de Castro Portes, Raquel; Egli, Markus

    2017-10-01

    The European Alps are a geomorphologically active region and experience a number of gravity-driven hillslope processes. Soil and landscape formation in the Alps has consequently undergone several minor and major traceable changes of developmental trajectories during the Holocene. Soil development is hypothesised to be often non-linear with time and characterised by stages of progressive and regressive evolution caused by upbuilding (formation, profile deepening) and erosion (profile shallowing). Several cold and warm climate phases are identified during the Holocene but it is largely unknown which effects these might have had on slope processes. By using datable moraines (10Be) and mires (14C), we have constructed a temporal framework for these processes. Using the geochemical imprint of mires in the Alpine setting of the Göschener-valley of the Central Swiss Alps, we reconstructed general (mostly erosional) landscape processes for the last ca. 10 ka. As this is the type locality for the Göschener cold phase, we assumed that this phase (Göschener cold phase I and II 1.5 and 2.5 ka BP) should have left easily recognizable traits. After deglaciation (11-12 ka BP), soil evolution was progressive. Beginning around 8 ka BP, we detect a distinct increase in erosion here, together with a vegetation change (towards tundra vegetation) and the highest measured rates of carbon sequestration. Other phases of high geomorphic activity were recognised ca. 5-6 ka BP, 4 ka BP and, to a lesser extent, 1-3 ka ago. The cold phase at 5-6 ka BP corresponds to a less distinct change in vegetation and lessened erosion. Human impact is increasingly obvious since about 2.4 ka BP which overlaps with the Göschener cold phase. Nonetheless, erosion processes were not extraordinarily high during this period and a climate effect cannot be distinguished. We detect evidence of increasing human disturbance (regressive soil evolution) for about the last 1 ka. We also detect an increase in dust

  13. Time constraints for post-LGM landscape response to deglaciation in Val Viola, Central Italian Alps

    Science.gov (United States)

    Scotti, Riccardo; Brardinoni, Francesco; Crosta, Giovanni Battista; Cola, Giuseppe; Mair, Volkmar

    2017-12-01

    Across the northern European Alps, a long tradition of Quaternary studies has constrained post-LGM (Last Glacial Maximum) landscape history. The same picture remains largely unknown for the southern portion of the orogen. In this work, starting from existing 10Be exposure dating of three boulders in Val Viola, Central Italian Alps, we present the first detailed, post-LGM reconstruction of landscape (i.e., glacial, periglacial and paraglacial) response south of the Alpine divide. We pursue this task through Schmidt-hammer exposure-age dating (SHD) at 34 sites including moraines, rock glaciers, protalus ramparts, rock avalanche deposits and talus cones. In addition, based on the mapping of preserved moraines and on the numerical SHD ages, we reconstruct the glacier extent of four different stadials, including Egesen I (13.1 ± 1.1 ka), Egesen II (12.3 ± 0.6 ka), Kartell (11.0 ± 1.4 ka) and Kromer (9.7 ± 1.4 ka), whose chronologies agree with available counterparts from north of the Alpine divide. Results show that Equilibrium Line Altitude depressions (ΔELAs) associated to Younger Dryas and Early Holocene stadials are smaller than documented at most available sites in the northern Alps. These findings not only support the hypothesis of a dominant north westerly atmospheric circulation during the Younger Dryas, but also suggest that this pattern could have lasted until the Early Holocene. SHD ages on rock glaciers and protalus ramparts indicate that favourable conditions to periglacial landform development occurred during the Younger Dryas (12.7 ± 1.1 ka), on the valley slopes above the glacier, as well as in newly de-glaciated areas, during the Early Holocene (10.7 ± 1.3 and 8.8 ± 1.8 ka). The currently active rock glacier started to develop before 3.7 ± 0.8 ka and can be associated to the Löbben oscillation. Four of the five rock avalanches dated in Val Viola cluster within the Early Holocene, in correspondence of an atmospheric warming phase. By contrast

  14. Interactions between geomorphology and vegetation in the Western Swiss Alps: first investigations

    Science.gov (United States)

    Giaccone, Elisa; Mariéthoz, Grégoire; Lambiel, Christophe

    2017-04-01

    The influence of earth surface processes can modify the microhabitat conditions and the species richness, composition and distribution patterns of plant communities. It is therefore important to understand how geomorphology affects the distribution of plant species to predict future vegetation evolution in a context of climate change. To better analyse the influence of geomorphology on vegetation growth in the alpine periglacial belt, we are studying various geomorphological processes (e.g. cryoturbation and solifluction), permafrost, nivation and ground surface characteristics at three focus sites of the Vaud Alps (Western Swiss Alps). The sites are located at an altitude range comprised between 2000 and 2600 m a.s.l. The geomorphology is characterized mainly by the presence of small glaciers, large moraine deposits, rock glaciers and debris slopes. Monitoring of the ground surface temperatures, permafrost mapping, vegetation survey and drone flights have been carried out to investigate in detail the environmental variables. Initial results show a heterogeneous vegetation cover depending on time since deglaciation, debris size, ground stability and soil age. Debris pioneer species are present on moraines, rock glaciers and debris slope; grassland are developed in zones not affected by LIA glacier advances or other interfering processes such as avalanches. The high-resolution images obtained from drone flights (5 cm/pixel) allow a detailed study of the granulometry. In order to use such geomorphological information on a wider area of interest, the local data acquired on focus sites have to be spatialized to a regional scale. This is accomplished by developing an approach based on remote sensing and multiple-point geostatistics that performs a semi-automated geomorphological mapping (SAGM). The SAGM is based on a training image composed by a geomorphological map yet existent, an orthophoto, the slope, the aspect, the curvature, the granulometry classification and

  15. Anomalous directional behaviour of the real parts of the induction arrows in the Eastern Alps: tectonic and palaeogeographic implications

    Directory of Open Access Journals (Sweden)

    P. A. Schnegg

    2001-06-01

    Full Text Available The electromagnetic induction pattern in the Eastern Alps is characterised by a (continuous large-scale zone on which the real parts of the induction arrows show anomalous directional behaviour. This zone extends from the Penninic Domain of Eastern Switzerland (Graubünden probably into the Carpathian ranges. A coarse mesh of a Magnetotelluric (MT and Geomagnetic Deep Sounding (GDS station in the Alps of Graubünden and Valais (Western Switzerland indicates that this electromagnetic anomaly is restricted to the Mesozoic sediments of the North Penninic Bündnerschiefer-facies that begins in Eastern Switzerland and extends towards the east beneath Austroalpine, South Penninic and Southalpine units. Striking similarities in position and arrangement between this zone and the magnetic signature in the Eastern Alps are found. The analysis of the GDS data with the method of the Hypothetical Event Analysis (HEA shows that current channelling affects the electromagnetic fields in this zone and causes the anomalous direction of induction arrows. Based on the combined interpretation of GDS data from the Eastern Alps and West Hungary together with our recent data from Switzerland, the following geological implications are discussed: i a spatial decoupling of induction processes from the upper to the lower crust; ii a lower crustal conductive structure caused by the indentation of the Northern Adriatic promontory or terrane; iii the eastward continuation of the Bündnerschiefer-facies at least to the tectonic window of Rechnitz.

  16. Physico-chemical control on the REE minerals in chloritoid-grade metasediments from a single outcrop (Central Alps, Switzerland)

    DEFF Research Database (Denmark)

    Janots, Emilie; Berger, Alfons; Engi, Martin

    2011-01-01

    This study assesses the effects of fluid, whole-rock composition and oxygen fugacity, on the texture and composition of monazite, allanite, and xenotime. For this purpose, these were investigated in 13 monometamorphic metasediments from a single locality of the Central Alps (Switzerland), which...

  17. Diversity of bacteria producing pigmented colonies in areosol, snow and soil samples from remote glacial areas (Antarctica, Alps and Andes)

    Czech Academy of Sciences Publication Activity Database

    González-Toril, E.; Amils, R.; Delmas, R.J.; Petit, J.R.; Komárek, Jiří; Elster, Josef

    2008-01-01

    Roč. 5, č. 1 (2008), s. 1-24 ISSN 1810-6277 R&D Projects: GA MŠk ME 934; GA MŠk ME 945; GA ČR GA206/05/0253 Institutional research plan: CEZ:AV0Z60050516 Keywords : bacteria * Andes * Antarctic * Alps Subject RIV: EF - Botanics

  18. A FOSSIL WHIP-SCORPION (ARACHNIDA: THELYPHONIDA FROM THE UPPER CARBONIFEROUS OF THE CARNIC ALPS (FRIULI, NE ITALY

    Directory of Open Access Journals (Sweden)

    PAUL A. SELDEN

    2016-03-01

    Full Text Available A new and well-preserved fossil whip scorpion (Arachnida: Uropygi: Thelyphonida is described from the Late Carboniferous of the Carnic Alps, Friuli, Italy. It is referred to Parageralinura marsiglioi n. sp. The new specimen is the first Carboniferous arachnid to be described from mainland Italy and is possibly the youngest Palaeozoic thelyphonid.

  19. Jasrouxite, a new Pb-Ag-As-Sb member of the lillianite homologous series from Jas Roux, Hautes Alpes, France

    DEFF Research Database (Denmark)

    Topa, Dan; Makovicky, Emil; Favreau, Georges

    2013-01-01

    The thallium-rich sulfosalt deposit of Jas Roux, situated in the Pelvoux Massif (Hautes-Alpes de´partement, France), occurs in a Triassic sedimentary series. Jasrouxite belongs to the early lead-containing stages of the Tl–As–Sb period of mineralization. It occurs in a silicified gangue, along...

  20. Understanding land cover changes in the Italian Alps and Romanian Carpathians combining remote sensing and stakeholder interviews

    NARCIS (Netherlands)

    Malek, Ziga; Scolobig, Anna; Schröter, Dagmar

    2014-01-01

    In the last two decades, socio-economic changes in Europe have had a significant effect on land cover changes, but it is unclear how this has affected mountain areas. We focus on two mountain areas: the eastern Italian Alps and the Romanian Curvature Carpathians. We classified land cover from Earth

  1. Angelo Sismonda (1807–1878), pioneer of geological mapping in the Alps of Savoy and the Piedmont: a bibliography

    CERN Document Server

    Hollier, John; Basaglia, Tullio; Hollier, Anita

    2016-01-01

    Angelo Sismonda (Ange Sismonda) was an Italian mineralogist and geologist based in Turin during the Risorgimento who produced pioneering maps of the Alps in the Kingdom of Sardinia. Well known during his lifetime, he is now mentioned only in passing by historians and no comprehensive bibliography of his work exists. To render his work more accessible, we present a short biography and a bibliography.

  2. Texture segmentation as first step towards archaeological object detection in high-resolution satellite images of the Silvretta Alps

    NARCIS (Netherlands)

    Lambers, K.; Zingman, I.; Neubauer, W.; Trinks, I.; Salisbury, R.B.; Einwögerer, C.

    2013-01-01

    Since 2007, the Silvretta Archaeological Project in the high Alps on the Swiss-Austrian border has been investigating the prehistoric origins of alpine pasture economy. In an area of about 540 km2 more than 20 well-preserved archaeological sites associated with alpine pastoralism have been recorded,

  3. Lightning in the eastern Alps 1993-1999, part I: Thunderstorm tracks

    Directory of Open Access Journals (Sweden)

    I. Bertram

    2004-01-01

    Full Text Available Thunderstorm tracks in the eastern Alps for the summers of 1993-1999 are investigated based on lightning data. The tracking method consists of three steps. Step one filters weak storms. Step two fixes the positions of the single cells, which are then connected. The wind at 700hPa, which approximates the steering level of the thunderstorms, is used to distinguish between six weather patterns. Maps including all discovered tracks are discussed for each flow type. While locations from which thunderstorms originate are almost similar, the track patterns are distinct for each flow type. Main initiation areas are mountain ranges of moderate altitude (≈2.5km MSL from where most of the tracks lead into flat areas.

  4. First-order similarities and differences between Alps, Dinarides, Hellenides and Anatolides-Taurides

    Science.gov (United States)

    Schmid, Stefan M.; Bernoulli, Daniel; Fügenschuh, Bernhard; Matenco, Liviu; Schefer, Senecio; Oberhänsli, Roland; van Hinsbergen, Douwe; Ustaszewski, Kamil

    2013-04-01

    We correlated tectonic units across several circum-Mediterranean orogen strands between the Alps, Carpathians, the Balkan Peninsula, the Aegean and Western Turkey. Our compilation allows discussing fundamental along-strike similarities and differences. One first-order difference is that Dinarides-Hellenides, Anatolides and Taurides represent orogens of opposite subduction polarity and age with respect to the Alps and Carpathians. The internal Dinarides are linked to the Alps and Western Carpathians along the Mid-Hungarian fault zone, a suspected former trench-trench transform fault; its lithospheric root was obliterated during Neogene back-arc extension that formed the Pannonian Basin. Dinarides and Hellenides alike consist of far-travelled nappes detached from the Adriatic continental margin along décollement horizons in Paleozoic or younger stratigraphic levels during Cretaceous and Cenozoic orogeny. The more internal nappes (i.e. Jadar-Kopaonik, Drina-Ivanjica, East Bosnian-Durmitor and their Pelagonian and Almopias equivalents in the Hellenides) are composite nappes whereby the allochthonous Adriatic margin sequences passively carry ophiolites (Western Vardar Ophiolitic Unit) obducted during the latest Jurassic-earliest Cretaceous. These obducted ophiolitic units, as well as ophiolites obducted onto Europe-derived units presently found in the East Carpathians (Eastern Vardar Ophiolitic Unit obducted onto the Dacia continental block), root in one single Neotethys ocean that started closing with the initiation of obduction in the latest Jurassic; final suturing occurred during Cretaceous times, terminating with the formation of the Sava-Izmir-Ankara suture in the latest Cretaceous. Ophiolitic "massifs" found outside the Sava-Izmir-Ankara suture zone do not mark oceanic sutures, nor do the Drina-Ivanjica and Pelagonian "massifs" represent independent continental fragments (terranes). The same logic applies to Western Turkey with the difference that the ophiolites

  5. Enercoop Rhone-Alpes: a green and citizen-oriented electricity

    International Nuclear Information System (INIS)

    2010-01-01

    Enercoop is a collective interest cooperative company which aims at providing electricity from renewable sources and at developing renewable energies in France. After a presentation of its objectives and strategies, this document gives an overview of the energy and socio-economic context in Europe and France, recalls the origin of this project and more particularly in the Rhone-Alpes region. It presents its objectives in terms of pricing and citizen empowerment, how to join Enercoop, its guarantees, its philosophy (ethical and democratic), its objectives in terms of renewable energy production, its relationship with ERDF (the company which manages the electricity distribution network in France). After some testimonies, some comments are made about energy management challenges

  6. The ozone pollution and the climatology in a Mediterranean space: the Alpes-Maritimes

    International Nuclear Information System (INIS)

    Martin, N.

    2008-12-01

    The tropospheric ozone, secondary pollutant affecting the health of the human beings, concerns particularly the department of the Alpes-Maritimes during the photochemical season. Mountainous littoral space, this territory is widely dominated during summer notably by anticyclonic conditions allowing the thermal breezes to express themselves. This regime of wind is in the center of the problem of the ozone pollution because it pulls frequently an accumulation of primary and secondary pollutants in the course of days within the same air mass. Although being a weakly industrialized department, the Alpes-Maritimes are victims of a strong period of sunshine which allows primary pollutants emitted mainly by the road traffic to produce some ozone. Through the data of pollution stemming from the network of surveillance of the air quality AtmoPACA as well as from very numerous measures of ground, the objective is to understand better the relations between the spatial and temporal variability of the ozone and that of the weather conditions to various scales. Having detailed the history of the available ozone and nitrogen dioxide measures in the department, the first approach in macro-scale is led between the NCEP reanalysis and the ozone pollution levels in nine measures stations of the Alpes-Maritimes. This first level of analysis allows defining the general meteorological configurations characterizing an episode of pollution by the ozone. The presence of an anticyclonic ridge on the Western Europe associated with weak speeds of wind, weak rates of relative humidity and a weak relative vorticity, provoke a degradation of the air quality in the department. A second analysis level is then approached: it is a question of clarifying in meso-scale and in micro-scale the weather conditions convenient to strong ozone concentrations. For it, itinerant ozone measures campaigns are made in the whole of the department; an important data base is established on Nice and in its

  7. Seasonal dynamics of plankton in a mountain lake in the southern Alps (Laghetto Inferiore, Switzerland

    Directory of Open Access Journals (Sweden)

    Viera STRAŠKRABOVÁ

    1999-08-01

    Full Text Available The pelagic populations in Laghetto Inferiore (southern Swiss Alps were studied between 1996 and 1998 during the ice-free period. Investigations revealed a considerable number of phytoplankton species but few zooplankton species. The vertical distribution of the main species of algae shows a marked vertical stratification, with higher biomass concentrations in the deep zone. Along this profile, species in the same taxonomic class tend to be distributed at different depths, according to their specific light requirements. During the study period no clear seasonal succession of populations was observed, also because of the influence of precipitation on the biological cycles. On the whole there was a good correspondence between the biomass values of phytoplankton and those of chlorophyll-a, both in integral samples of the whole water column and in the vertical profile.

  8. [Humus functioning types in evergreen coniferous forests of the French Inner Alps].

    Science.gov (United States)

    Michalet, R; Gandoy, C; Cadel, G; Girard, G; Grossi, J L; Joud, D; Pache, G

    2001-01-01

    Three humus forms that are widespread in the Inner Alps, a dysmull below Pinus sylvestris, an oligomull below Abies alba and a mor below Pinus cembra, were studied by following mineral nitrogen production and uptake and by a characterization of the pedofauna. Due to the production and uptake of nitrogen, mainly as nitrates and also due to the dominance of Lumbricids versus Arthropods, the oligomull was the sole humus form that functioned as a mull. Nevertheless relatively weak mineral nitrogen production and the dominance of endogeic soil-dwelling earthworms versus anecic earthworms demonstrated the moderate activity of this mull, which is representative of humus forms of old growth forests and cold climates. There was a discrepancy between the very low biological activity of the dysmull and its status of mull, while an observed bifunctioning between the different layers of this humus also differentiated it from the mor.

  9. Resonant laser power build-up in ALPS. A 'light-shining-through-walls' experiment

    International Nuclear Information System (INIS)

    Ehret, Klaus; Ghazaryan, Samvel; Frede, Maik

    2009-05-01

    The ALPS collaboration runs a light-shining-through-walls (LSW) experiment to search for photon oscillations into weakly interacting sub-eV particles (WISPs) inside of a superconducting HERA dipole magnet at the site of DESY. In this paper we report on the first successful integration of a large-scale optical cavity to boost the available power for WISP production in this type of experiments. The key elements are a frequency tunable narrow line-width continuous wave laser acting as the primary light source and an electronic feed-back control loop to stabilize the power build-up. We describe and characterize our apparatus and demonstrate the data analysis procedures on the basis of a brief exemplary run. (orig.)

  10. 25th Conference on Robotics in Alpe-Adria-Danube Region

    CERN Document Server

    Borangiu, Theodor

    2017-01-01

    This book presents the proceedings of the 25th International Conference on Robotics in Alpe-Adria-Danube Region, RAAD 2016 held in Belgrade, Serbia, on June 30th–July 2nd, 2016. In keeping with the tradition of the event, RAAD 2016 covered all the important areas of research and innovation in new robot designs and intelligent robot control, with papers including Intelligent robot motion control; Robot vision and sensory processing; Novel design of robot manipulators and grippers; Robot applications in manufacturing and services; Autonomous systems, humanoid and walking robots; Human–robot interaction and collaboration; Cognitive robots and emotional intelligence; Medical, human-assistive robots and prosthetic design; Robots in construction and arts, and Evolution, education, legal and social issues of robotics. For the first time in RAAD history, the themes cloud robots, legal and ethical issues in robotics as well as robots in arts were included in the technical program. The book is a valuable resource f...

  11. Frequent floods in the European Alps coincide with cooler periods of the past 2500 years.

    Science.gov (United States)

    Glur, Lukas; Wirth, Stefanie B; Büntgen, Ulf; Gilli, Adrian; Haug, Gerald H; Schär, Christoph; Beer, Jürg; Anselmetti, Flavio S

    2013-09-26

    Severe floods triggered by intense precipitation are among the most destructive natural hazards in Alpine environments, frequently causing large financial and societal damage. Potential enhanced flood occurrence due to global climate change would thus increase threat to settlements, infrastructure, and human lives in the affected regions. Yet, projections of intense precipitation exhibit major uncertainties and robust reconstructions of Alpine floods are limited to the instrumental and historical period. Here we present a 2500-year long flood reconstruction for the European Alps, based on dated sedimentary flood deposits from ten lakes in Switzerland. We show that periods with high flood frequency coincide with cool summer temperatures. This wet-cold synchronism suggests enhanced flood occurrence to be triggered by latitudinal shifts of Atlantic and Mediterranean storm tracks. This paleoclimatic perspective reveals natural analogues for varying climate conditions, and thus can contribute to a better understanding and improved projections of weather extremes under climate change.

  12. Preliminary comparative study of middle Anisian vertebrate ichnoassociation from South-Eastern Alps

    Science.gov (United States)

    Valdiserri, D.; Todesco, R.; Avanzini, M.

    2009-04-01

    Anisian vertebrate tracks from the south-eastern Alps are known since the first decades of 1900s (Abel, 1926). The sedimentary units yielding footprints are characterized by the alternation of limestone influenced by terrigenous supply with mere marine and volcanic layers allowing a precise dating. In this study, we compare four different ichnoassociations from three different outcrops in the South-Eastern Alps correlating them chronologically and sedimentologically. They were found to be subsequent in time from Lower Pelsonian (Bad Gfrill-Voltago Conglomerate; Todesco, 2007) through middle Pelsonian (Bad Gfrill- Giovo Formation) (Valdiserri et al., 2006) and basal Illyrian (Piz da Peres- Richthofen Conglomerate; Todesco et al., 2008) to the middle Illyrian (Val Duron-Morbiac Limestone; Avanzini et al., 2007). In all these ichno-associations, Rhynchosauroides, an ichno-genus referable to a lizard - like trackmaker well known in the European Anisian, is dominant. Within this group at least four different morphotypes are known, probably reflecting both intraspecific variation (i.e. sexual dimorphism) and different ichnospecies. Although the Chirotheridae group, referred to Archosaurian trackmakers Synaptichnium is represented in both Pelsonian ichnoassociation of the Bad Gfrill outcrop, while Chirotherium , Isochirotherium and Brachichirotherium are recognized both in Pelsonian and in Illyrian ichnosites with a incremental presence in the Illyrian The ichofamiliae Rotodactylidae und Procolophonidae seem well represented in the Pelsonian strata but absent in the Illyrian ones. The preliminarly comparative analysis of these four correlated ichnosites and the comparision with the yet known ones (Avanzini and Mietto 2008) pointed out the expected predominance of the Lepidosaurian-Archosaurian association typical for the middle Triassic ichnofauna. The incremental presence of the Chirotherian track in Illyrian and the presence of the Procolophonichium just in the

  13. Deep seismic reflection profiling in the Swiss Alps: Explosion seismology results for line NFP 20-East

    Science.gov (United States)

    Pfiffner, 0. A.; Frei, W.; Finckh, P.; Valasek, P.

    1988-11-01

    In September 1986, a 120-km-long seismic line was recorded through the Swiss Alps. The line traverses major units involved in thin- and thick-skinned Alpine tectonics. Our preliminary interpretation indicates that (1) lithologic boundaries such as basement-cover contacts, although severely deformed during the Alpine orogeny, can be identified on the seismic sections; (2) the top of the Aar massif, an external basement massif, extends deep into the Alpine orogen; (3) the upper and lower parts of the crust are more or less transparent, but are separated by a swarm of reflectors at mid-crustal level; (4) these mid-crustal reflectors might be related to trapped fluids from Alpine metamorphism; and (5) the Moho appears as a bright reflection that steepens from the north toward the south and terminates abruptly near the center of the Alpine chain, perhaps because of Alpine deformation.

  14. Slab rollback orogeny in the Alps and evolution of the Swiss Molasse basin

    Science.gov (United States)

    Schlunegger, Fritz; Kissling, Edi

    2015-01-01

    The stratigraphies of foreland basins have been related to orogeny, where continent–continent collision causes the construction of topography and the downwarping of the foreland plate. These mechanisms have been inferred for the Molasse basin, stretching along the northern margin of the European Alps. Continuous flexural bending of the subducting European lithosphere as a consequence of topographic loads alone would imply that the Alpine topography would have increased at least between 30 Ma and ca. 5–10 Ma when the basin accumulated the erosional detritus. This, however, is neither consistent with observations nor with isostatic mass balancing models because paleoaltimetry estimates suggest that the topography has not increased since 20 Ma. Here we show that a rollback mechanism for the European plate is capable of explaining the construction of thick sedimentary successions in the Molasse foreland basin where the extra slab load has maintained the Alpine surface at low, but constant, elevations. PMID:26472498

  15. Intra-continental subduction and contemporaneous lateral extrusion of the upper plate: insights into Alps-Adria interactions

    Science.gov (United States)

    van Gelder, Inge; Willingshofer, Ernst; Sokoutis, Dimitrios; Cloetingh, Sierd

    2017-04-01

    A series of physical analogue experiments were performed to simulate intra-continental subduction contemporaneous with lateral extrusion of the upper plate to study the interferences between these two processes at crustal levels and in the lithospheric mantle. The lithospheric-scale models are specifically designed to represent the collision of the Adriatic microplate with the Eastern Alps, simulated by an intra-continental weak zone to initiate subduction and a weak confined margin perpendicular to the direction of convergence in order to allow for extrusion of the lithosphere. The weak confined margin is the analog for the opening of the Pannonian back-arc basin adjacent to the Eastern Alps with the direction of extension perpendicular to the strike of the orogen. The models show that intra-continental subduction and coeval lateral extrusion of the upper plate are compatible processes. The obtained deformation structures within the extruding region are similar compared to the classical setup where lateral extrusion is provoked by lithosphere-scale indentation. In the models a strong coupling across the subduction boundary allows for the transfer of abundant stresses to the upper plate, leading to laterally varying strain regimes that are characterized by crustal thickening near a confined margin and dominated by lateral displacement of material near a weak lateral confinement. During ongoing convergence the strain regimes propagate laterally, thereby creating an area of overlap characterized by transpression. In models with oblique subduction, with respect to the convergence direction, less deformation of the upper plate is observed and as a consequence the amount of lateral extrusion decreases. Additionally, strain is partitioned along the oblique plate boundary leading to less subduction in expense of right lateral displacement close to the weak lateral confinement. Both oblique and orthogonal subduction models have a strong resemblance to lateral extrusion

  16. Present status and distribution of the Eurasian Lynx (Lynx lynx in the Italian Alps

    Directory of Open Access Journals (Sweden)

    Paolo Molinari

    2001-12-01

    Full Text Available Abstract To analyse the status and distribution of lynx in the Italian Alps from 1995 to 1999, all signs of lynx presence found were pooled, evaluated and interpreted with the same method. We distinguished three levels of reliability in accordance with the SCALP guidelines and the possibility to verify the collected data: Quality 1 (Q1 represent the hard facts, e.g. all reports of lynx killed, found dead or photographs and videos of lynx. Quality 2 (Q2 include all records of wild prey remains, livestock killed, tracks and scats confirmed by people who attended special courses, e.g. mainly game and forest wardens. Quality 3 (Q3 are all signs of presence reported by the general public as well as all sightings and vocalisations, e.g. mainly signs that cannot be verified. A total of 261 signs of lynx presence were recorded in the Italian Alps, of which 85 were Q2, the remaining were Q3 as no Q1 data was reported. The Q2 data was confined to four different areas whereas the Q3 data showed a scattered distribution in all the Alps. The dynamics in the Italian Alps during the past pentad was characterised by four main events: (1 the positive trend that had been observed in the north-east of Friuli V.G. (the Tarvisiano up until 1995 decreased, but (2 at the same time an increased number of data was reported from north-east of the Veneto (Province of Belluno. Consequently, in the south-eastern Alps more data were collected over a bigger area than in the previous pentad. (3 The lynx occurrence of unknown origin in the Trentino has gone extinct again. And (4 the suspected presence of lynx in the Val d'Aosta and in the northernmost Piemonte (Val d'Ossola was confirmed by Q2 data. In Italy, lynx still have not established a vital population even though suitable habitat is available from the south-western through to the eastern Alps. With the exception of the new occurrence in the province of Belluno, lynx occur only in areas bordering with

  17. FEASIBILITY OF THE AEROSOL-TO-LIQUID PARTICLE EXTRACTION SYSTEM (ALPES) FOR COLLECTION OF VIABLE FRANCISELLA SP.

    Energy Technology Data Exchange (ETDEWEB)

    Heitkamp, M

    2006-08-07

    Several Biowatch monitoring sites in the Houston area have tested positive for Francisella tularensis and there is a need to determine whether natural occurring Francisella-related microorganism(s) may be responsible for these observed positive reactions. The collection, culturing and characterization of Francisella-related natural microorganisms will provide the knowledge base to improve the future selectivity of Biowatch monitoring for Francisella. The aerosol-to-liquid particle extraction system (ALPES) is a high-efficiency, dual mechanism collection system that utilizes a liquid collection medium for capture of airborne microorganisms. Since the viability of microorganisms is preserved better in liquid medium than on air filters, this project was undertaken to determine whether Francisella philomiragia and Francisella tularensis LVS maintain acceptable viability in the continuous liquid recirculation, high direct current voltage and residual ozone concentrations which occur during ALPES operation. Throughout a series of preliminary trial runs with representative gram-negative and gram-positive microorganisms, several design modifications and improvements to the ALPES optimized liquid handling, electrical stability, sampling and overall performance for biological sampling. Initial testing with Francisella philomiragia showed viability was preserved better in PBS buffer than HBSS buffer. Trial runs at starting cell concentrations of 1.8 x 10{sup 6} and 2.5 x 10{sup 4} CFU/L showed less than a 1-log decrease in viability for F. philomiragia after 24 h in the ALPES. Francisella tularensis LVS (live vaccine strain) was used as a surrogate for virulent F. tularensis in ALPES trial runs conducted at starting cell concentrations of 10{sup 4}, 10{sup 5} and 10{sup 6} CFU/L. F. tularensis LVS was slow-growing and required highly selective growth media to prevent overgrowth by collected airborne microorganisms. In addition, one ALPES unit intake was HEPA filtered during

  18. Curie temperature depths in the Alps and the Po Plain (northern Italy): Comparison with heat flow and seismic tomography data

    Science.gov (United States)

    Speranza, Fabio; Minelli, Liliana; Pignatelli, Alessandro; Gilardi, Matteo

    2016-08-01

    We report on the spectral analysis of the aeromagnetic residuals of the Alps and the Po Plain (northern Italy) to derive the Curie point depth (CPD), assumed to represent the 550 °C isotherm depth. We analysed both the aeromagnetic residuals of northern Italy gathered by Agip (now Eni) and the recent EMAG2 compilation. We used the centroid method on 44 and 96 (respectively) 100 × 100 km2 windows considering both a random and a fractal magnetization distribution, but found that, at least for the Alps, the fractal model yields unrealistically shallow CPDs. Analyses considering a random magnetization model give CPDs varying between 12 and 39 km (22 to 24 km on average considering the two data sets) in the Po Plain, representing the Adriatic-African foreland area of the Alps, in substantial agreement with recently reported heat flow values of 60-70 mW/m2. In the Alps, the Eni data set yields shallow CPDs ranging between 6 and 23 km (13 km on average). EMAG2 analysis basically confirms the ;hot; Alpine crust, but reduces it to three 50-100 km wide patches elongated along the chain, where CPDs vary between 10 and 15 km. Such ;hot; Alpine domains occur just north of maximum (50-55 km) crustal thickness zones of the Alps and correspond to low seismic wave velocity anomalies recently documented in the 20-22 to 35-38 km depth interval, whereas no relation is apparent with local geology. Assuming an average crustal thermal conductivity of 2.5 W/m °C and a steady-state conductive model, CPDs from the hot zones of the Alps translate into heat flow values of 110-120 mW/m2, and to a basal heat flow from the mantle exceeding 100 mW/m2 that is significantly greater than that expected in a mountain range. Thus we conclude that the steady-state conductive model does not apply for the Alps and granitic melts occur at ∼15-40 km depths, consistently with seismic tomography evidence.

  19. Assessing the Sensitivity of Mountain Forests to Site Degradation in the Northern Limestone Alps, Europe

    Directory of Open Access Journals (Sweden)

    Birgit Reger

    2015-05-01

    Full Text Available Because of some land-use practices (such as overstocking with wild ungulates, historical clear-cuts for mining, and locally persisting forest pasture, protective forests in the montane vegetation belt of the Northern Limestone Alps are now frequently overaged and poorly structured over large areas. Windthrow and bark beetle infestations have generated disturbance areas in which forests have lost their protective functions. Where unfavorable site conditions hamper regeneration for decades, severe soil loss may ensue. To help prioritize management interventions, we developed a geographic information system-based model for assessing sensitivity to site degradation and applied it to 4 test areas in the Northern Limestone Alps of Austria and Bavaria. The model consists of (1 analysis of site conditions and forest stand structures that could increase sensitivity to degradation, (2 evaluation of the sensitivity of sites and stands, and (3 evaluation and mapping of mountain forests' sensitivity to degradation. Site conditions were modeled using regression algorithms with data on site parameters from pointwise soil and vegetation surveys as responses and areawide geodata on climate, relief, and substrate as predictors. The resulting predictor–response relationships were applied to test areas. Stand structure was detected from airborne laser scanning data. Site and stand parameters were evaluated according to their sensitivity to site degradation. Sensitivities of sites and stands were summarized in intermediate-scale sensitivity maps. High sensitivity was identified in 3 test areas with pure limestone and dolomite as the prevailing sensitivity level. Moderately sensitive forests dominate in the final test area, Grünstein, where the bedrock in some strata contains larger amounts of siliceous components (marl, mudstone, and moraines; degraded and slightly sensitive forests were rare or nonexistent in all 4 test areas. Providing a comprehensive overview

  20. Rock-type control on erosion-induced uplift, eastern Swiss Alps

    Science.gov (United States)

    Korup, Oliver; Schlunegger, Fritz

    2009-02-01

    There is growing evidence that Quaternary rock uplift in parts of the European Alps is a consequence of climate- and erosion-driven isostatic rebound. Contemporary rates of rock uplift U in the Swiss Alps show two distinctive dome-like peak regions that attain ~ 1.6 mm yr - 1 . We focus on the Alpenrhein catchment and its surroundings, where one of these peak regions spatially coincides with widely exposed Cretaceous Bündner schist and lower Tertiary flysch. Field assessments and analyses of hillslope gradient distributions quantitatively demonstrate the low rock-mass strength and high erodibility of these rocks. This is reflected in mean postglacial catchment erosion rates D ~ 4 mm yr - 1 , as opposed to 0.7 mm yr - 1 in more resistant crystalline rocks. Though largely inferred from landslide- and debris-flow prone tributary catchments export, from the region. We further find that the steepness of bedrock rivers, the density of large landslides, and D correlate with the highest values of U. Our observations highlight the possibility that erosion of mechanically weak Bündner schist and flysch enhanced by large landslides may have contributed to regional crustal unloading, and concomitant rock uplift. Irrespective of whether this is betraying a coupling between long-term uplift and erosion modulated by rock type, our findings indicate that long-term (10 3 to 10 4 yr) geomorphic signals contained in bedrock-river steepness, spatial density of large landslides, and postglacial erosion rates strikingly correlate with regional gradients of historic (10 1 yr) rock uplift rates.

  1. Historical glacier outlines from digitized topographic maps of the Swiss Alps

    Science.gov (United States)

    Freudiger, Daphné; Mennekes, David; Seibert, Jan; Weiler, Markus

    2018-04-01

    Since the end of the Little Ice Age around 1850, the total glacier area of the central European Alps has considerably decreased. In order to understand the changes in glacier coverage at various scales and to model past and future streamflow accurately, long-term and large-scale datasets of glacier outlines are needed. To fill the gap between the morphologically reconstructed glacier outlines from the moraine extent corresponding to the time period around 1850 and the first complete dataset of glacier areas in the Swiss Alps from aerial photographs in 1973, glacier areas from 80 sheets of a historical topographic map (the Siegfried map) were manually digitized for the publication years 1878-1918 (further called first period, with most sheets being published around 1900) and 1917-1944 (further called second period, with most sheets being published around 1935). The accuracy of the digitized glacier areas was then assessed through a two-step validation process: the data were (1) visually and (2) quantitatively compared to glacier area datasets of the years 1850, 1973, 2003, and 2010, which were derived from different sources, at the large scale, basin scale, and locally. The validation showed that at least 70 % of the digitized glaciers were comparable to the outlines from the other datasets and were therefore plausible. Furthermore, the inaccuracy of the manual digitization was found to be less than 5 %. The presented datasets of glacier outlines for the first and second periods are a valuable source of information for long-term glacier mass balance or hydrological modelling in glacierized basins. The uncertainty of the historical topographic maps should be considered during the interpretation of the results. The datasets can be downloaded from the FreiDok plus data repository (https://freidok.uni-freiburg.de/data/15008, https://doi.org/10.6094/UNIFR/15008).

  2. The evolution of illite to muscovite: mineralogical and isotopic data from the Glarus Alps, Switzerland

    Science.gov (United States)

    Hunziker, J. C.; Frey, M.; Clauer, N.; Dallmeyer, R. D.; Friedrichsen, H.; Flehmig, W.; Hochstrasser, K.; Roggwiler, P.; Schwander, H.

    1986-02-01

    Thirty-five illite and muscovite concentrates were extracted from Triassic and Permian claystones, shales, slates and phyllites along a cross-section from the diagenetic Alpine foreland (Tabular Jura and borehole samples beneath the Molasse Basin) to the anchi- and epimetamorphic Helvetic Zone of the Central Alps. Concentrates and thin sections were investigated by microscopic, X-ray, infrared, Mössbauer, thermal (DTA and TG), wet chemical, electron microprobe, K-Ar, Rb-Sr, 40Ar/39Ar and stable isotope methods. With increasing metamorphic grade based on illite “crystallinity” data (XRD and IR) the following continuous changes are observed: (i) the 1Md→2M1 polymorph transformation is completed in the higher grade anchizone; (ii) K2O increases from 6 8 wt. % (diagenetic zone) to 8.5 10% (anchizone) to 10 11.5% (epizone), reflecting an increase in the total negative layer charge from 1.2 to 2.0; (iii) a decrease of the chemical variation of the mica population with detrital muscovite surviving up to the anchizone/ epizone boundary; iv) a shift of an endothermic peak in differential thermal curves from 500 to 750° C; (v) K-Ar and Rb-Sr apparent ages of the fraction Calanda phase) in the Glarus Alps. A second age group between 25 and 20 Ma. can probably be attributed to movements along the Glarus thrust (Ruchi phase), while values down to 9 Ma., in regions with higher metamorphic conditions, suggest thermal conditions persisting at least until the middle Tortonian.

  3. From après-ski to après-tourism: the Alps in transition?

    Directory of Open Access Journals (Sweden)

    Philippe Bourdeau

    2009-12-01

    Full Text Available Winter sports occupy a prominent place in European tourism, not only because of their economic importance in mountainous areas but also due to their major symbolic significance in the "leisure civilisation". Yet the world of winter tourism is full of uncertainties connected with climate change and also with evolutions and structural breaks that call into question the development model on which it is based. This context of profound change gives us the opportunity to question the limits of the industrial model that has governed the development of the Alps for the practice of skiing and to examine alternative future scenarios to "all-out skiing" and even "all-out tourism".Les sports d’hiver occupent une place de premier plan dans le tourisme européen, non seulement du fait de leur poids économique dans les régions de montagne, mais aussi par leur forte dimension symbolique dans la « civilisation des loisirs ». Pourtant l’univers du tourisme hivernal est parcouru par de nombreuses incertitudes liées au changement climatique, mais aussi à des évolutions et des ruptures structurelles qui remettent en question le modèle de développement sur lequel il repose. Ce contexte de mutation permet d’interroger les limites du modèle industriel qui a présidé à l’aménagement des Alpes pour la pratique du ski et d’examiner des figures d’avenir alternatives au « tout ski » et même au « tout tourisme ».

  4. Quantification of strain rate in the Western Alps using geodesy: comparisons with seismotectonics

    International Nuclear Information System (INIS)

    Delacou, B.; Allanic, C.; Burkhard, M.; Sue, Ch.; Nocquet, J.-M.; Champagnac, J.-D.; Sue, Ch.

    2008-01-01

    The contrasted seismotectonic regime of the Western Alps is characterized by radial extension in the high chain, combined with local compressive areas at the foothill of the belt, and everywhere occurrence of transcurrent tectonics. Here, we compare this seismotectonic regime to a large-scale compilation of GPS measurements in the Western Alpine realm. Our analysis is based on the raw GPS database, which give the measured velocity field with respect to the so called 'stable Europe', and an interpolated velocity field, in order to smooth the database on a more regular mesh. Both strain rate and rotational components of the deformation are investigated. The strain rate field shows patch-like structure, with extensional areas located in the core and to the North of the belt and compressional areas located in its periphery. Although the GPS deformation fields (both raw and interpolated) are more spatially variable than the seismotectonic field, a good qualitative correlation is established with the seismotectonic regionalization of the deformation. The rotation rate fields (both raw and interpolated) present counterclockwise rotations in the innermost part of the belt and a surprising continuous zone of clockwise rotations following the arc-shape geometry of the Western Alps along their external border. We interpret this new result in term of a counterclockwise rotation of the Apulia plate with respect to the stable Europe. This tectonic scheme may induce clockwise rotations of crustal block along the large strike-slip fault system, which runs in the outer part of the belt, from the Rhone-Simplon fault to the Belledonne fault and Southeastward, to the High-Durance and Argentera fault. (author)

  5. The potential of detrital garnet as a provenance proxy in the Central Swiss Alps

    Science.gov (United States)

    Stutenbecker, Laura; Berger, Alfons; Schlunegger, Fritz

    2017-04-01

    Detrital garnet is a promising candidate to reliably fingerprint sediment sources in the Alps, which has so far been complicated by the wide range and similarity of some of the lithologies. Garnet is present in most Alpine sediments, is easy to identify, is fairly stable and, most importantly, reflects the type and the metamorphic grade of its source rock in its chemical composition. This study aims to establish fingerprints based on detrital garnet composition for the most important tectonic units of the Central Alps, including European, Penninic and Adriatic basement rocks and their respective metasedimentary covers. Sediments collected from modern rivers, which drain representative portions of the individual tectonic units, contain a natural mixture of the various garnet populations present in each unit. We selected six catchments in southwestern Switzerland draining the External massifs, Helvetic sediments and the Penninic nappe stack at the transition of Alpine greenschist- to amphibolite-facies metamorphism in order to test the variability of Alpine garnets and the role of inherited (pre-Alpine) garnets. Extraordinary grossular- and spessartine-rich garnets of the External massifs, which experienced greenschist facies metamorphism, are clearly distinguishable from generally almandine-rich garnets supplied by the higher-grade metamorphic Penninic nappe stack. The variable pyrope, grossular and spessartine components of these almandine-rich garnets can be used to further distinguish pre-Alpine, Alpine eclogite-facies and low-grade metasedimentary garnets. This provenance proxy has the potential to be used for reconstructing sediment sources, transport and dispersal patterns in a variety of settings throughout the Alpine sedimentary record.

  6. Atmospheric deposition chemistry in a subalpine area of the Julian Alps, NW Slovenia

    Directory of Open Access Journals (Sweden)

    Gregor Muri

    2013-04-01

    Full Text Available Wet-only precipitation was collected in Rateče, a remote village in the outskirts of the Julian Alps (Nort-West Slovenia during 2003-2011, in order to characterise atmospheric deposition chemistry. The samples were collected on a daily basis and combined into weekly samples that were analysed for pH, conductivity and major anions and cations. Ammonium, nitrate and sulphate were the most abundant ions, exhibiting volume-weighted mean values (2003-2011 of 22, 17 and 17 µeq L–1, respectively. Furthermore, the trends of the major parameters in the precipitation were assessed using a simple linear regression. A significant downward trend of both nitrate and sulphate was observed, explained by evident reductions in NOx and SOx emissions in the region. The decline of nitrate and sulphate was also reflected in a significant and downward trend of conductivity. While the trend of ammonium could also be downward, the trends of other major ions were not significant. Atmospheric nitrogen deposition, representing inorganic forms of nitrogen (i.e., ammonium and nitrate, was calculated to examine potential threats that the deposition of nitrogen may cause on lake ecosystems. Nitrogen deposition in Rateče ranged from 5.5 to 9.5 kg N ha–1 yr–1. Although this was below the critical threshold that might cause an impact on surface waters, nitrogen deposition in the nearby Julian Alps, where sensitive mountain lakes are situated, might be higher and its impact on the ecosystem greater. In fact, several studies performed on water chemistry, sedimentary organic matter and stable isotopes in Slovenian mountain lakes have shown progressive changes in their water columns and sediments that can be attributed to nitrogen deposition.

  7. Epidemiology of Pestivirus infection in wild ungulates of the French South Alps.

    Science.gov (United States)

    Martin, Claire; Letellier, Carine; Caij, Brigitte; Gauthier, Dominique; Jean, Nicolas; Shaffii, Anahita; Saegerman, Claude

    2011-01-27

    Inter-species transmission is often incriminated in the epidemiology of Pestivirus diseases. The purpose of this study was to investigate the prevalence of Pestivirus in some mountain wild ungulates and to determine their role in Pestivirus transmission, as mountain pastures are a place where cohabitations between wild and domestic ungulates are particularly high. Between 2003 and 2007, a longitudinal epidemiological study was carried out on hunted ungulates in the French Hautes-Alpes department. Pestivirus-specific antibodies against p80 protein (also named NS3) common to all Bovine Viral Diarrhea Virus (BVDV) and Border Disease Virus (BDV) were found in 45.9% (95% confidence interval [CI95%]: 40.5-51.3%) of the 343 tested chamois (Rupicapra rupicapra). In addition, mouflons (Ovis gmelinii musimon) were shown for the first time to be strongly infected (61.1%; CI95%: 38.6-83.6) by a Pestivirus. These serological ELISA results were confirmed by comparative virus neutralization tests, performed on seven Pestivirus strains by using 15 seropositive samples. The highest antibody titers were directed against 2 BDV strains (Av and 33s strains), rather than BDV-4, a strain responsible for Pyrenean-chamois epizooties. Virus neutralization tests confirm a BDV circulation in wild ungulates in the French South Alps. However, no Pestivirus RNA was detected by reverse-transcriptase polymerase chain reaction in serum and spleen samples from seronegative animals and no virus was isolated from those samples either. Efforts should be made to improve the protocol in order to be able to isolate and characterize the local strain. Finally, the oldness (age) and femaleness (gender) increase the risk of seroconversion in chamois. Copyright © 2010 Elsevier B.V. All rights reserved.

  8. Pestiviruses infections at the wild and domestic ruminants interface in the French Southern Alps.

    Science.gov (United States)

    Martin, Claire; Duquesne, Véronique; Adam, Gilbert; Belleau, Eric; Gauthier, Dominique; Champion, Jean-Luc; Saegerman, Claude; Thiéry, Richard; Dubois, Eric

    2015-02-25

    In alpine pasture, interspecies transmission has recently been incriminated in the epidemiology of pestivirus infection. The aim of this study was to investigate pestivirus infections in wild and domestic ruminants sharing pastures in the French Southern Alps. Animal sera were screened for pestivirus antibodies against the pestivirus NS3 protein by a commercial blocking enzyme linked immunosorbent assay (ELISA). All 38 domestic herds tested were positive for pestivirus-specific antibodies. Individual sero-prevalence reached 76.5% (95% confidence interval [95% CI]: [74.2-78.8%]) of the 1383 sheep tested. For wild ruminants, 38.7% (95% CI: [33.8-43.9%]) of the 369 chamois tested, 28.7% (95% CI: [17.4-38.1%]) of the 72 roe deer, and 22.2% (95% CI: [6.5-37.9%]) of the 27 mouflons were seropositive. Virus screening was carried out on spleen samples from hunted wild animals (n=160) and from 15 domestic ruminants (clinically suspected to be persistently infected animals), by a conventional reverse transcription-polymerase chain reaction (RT-PCR). Three pestivirus strains were isolated from the sheep samples positive by RT-PCR. The viruses were classified in the BDV-3, BDV-Tunisian and BDV-6 genotypes. For the first time, one strain (RUPI-05 strain) was isolated from an alpine chamois and clustered in the BDV-6 genotype, showing in the 5'-UTR region 92% of identity with the ovine isolate from the same area. Thus, an active circulation of pestiviruses was demonstrated in both wild and domestic ungulates from the French Southern Alps. The results suggest that interspecies transmission between sheep and chamois probably occur. Copyright © 2014 Elsevier B.V. All rights reserved.

  9. Powered mobility intervention: understanding the position of tool use learning as part of implementing the ALP tool.

    Science.gov (United States)

    Nilsson, Lisbeth; Durkin, Josephine

    2017-10-01

    To explore the knowledge necessary for adoption and implementation of the Assessment of Learning Powered mobility use (ALP) tool in different practice settings for both adults and children. To consult with a diverse population of professionals working with adults and children, in different countries and various settings; who were learning about or using the ALP tool, as part of exploring and implementing research findings. Classical grounded theory with a rigorous comparative analysis of data from informants together with reflections on our own rich experiences of powered mobility practice and comparisons with the literature. A core category learning tool use and a new theory of cognizing tool use, with its interdependent properties: motivation, confidence, permissiveness, attentiveness and co-construction has emerged which explains in greater depth what enables the application of the ALP tool. The scientific knowledge base on tool use learning and the new theory conveys the information necessary for practitioner's cognizing how to apply the learning approach of the ALP tool in order to enable tool use learning through powered mobility practice as a therapeutic intervention in its own right. This opens up the possibility for more children and adults to have access to learning through powered mobility practice. Implications for rehabilitation Tool use learning through powered mobility practice is a therapeutic intervention in its own right. Powered mobility practice can be used as a rehabilitation tool with individuals who may not need to become powered wheelchair users. Motivation, confidence, permissiveness, attentiveness and co-construction are key properties for enabling the application of the learning approach of the ALP tool. Labelling and the use of language, together with honing observational skills through viewing video footage, are key to developing successful learning partnerships.

  10. The interplay between subduction and lateral extrusion: A case study for the European Eastern Alps based on analogue models

    Science.gov (United States)

    van Gelder, I. E.; Willingshofer, E.; Sokoutis, D.; Cloetingh, S. A. P. L.

    2017-08-01

    A series of analogue experiments simulating intra-continental subduction contemporaneous with lateral extrusion of the upper plate are performed to study the interference between these two processes at crustal levels and in the lithospheric mantle. The models demonstrate that intra-continental subduction and coeval lateral extrusion of the upper plate are compatible processes leading to similar deformation structures within the extruding region as compared to the classical setup, lithosphere-scale indentation. Strong coupling across the subduction boundary allows for the transfer of stresses to the upper plate, where strain regimes are characterized by crustal thickening near a confined margin and dominated by lateral displacement of material near a weak lateral confinement. The strain regimes propagate laterally during ongoing convergence creating an area of overlap characterized by transpression. When subduction is oblique to the convergence direction, the upper plate is less deformed and as a consequence the amount of lateral extrusion decreases. In addition, strain is partitioned along the oblique plate boundary resulting in less subduction in expense of right lateral displacement close to the weak lateral confinement. Both oblique and orthogonal subduction models have a strong resemblance to lateral extrusion tectonics of the Eastern Alps (Europe), where subduction of the adjacent Adriatic plate beneath the Eastern Alps is debated. Our results imply that subduction of Adria is a valid mechanisms to induce extrusion-type deformation within the Eastern Alps lithosphere. Furthermore, our findings suggest that the Oligocene to Late Miocene structural evolution of the Eastern Alps reflects a phase of oblique subduction followed by a later stage of orthogonal subduction conform a Miocene shift in the plate motion of Adria. Oblique subduction also provides a viable mechanism to explain the rapid decrease in slab length of the Adriatic plate beneath the Eastern Alps

  11. From the Western Alps across Central Europe: Postglacial recolonisation of the tufa stream specialist Rhyacophila pubescens (Insecta, Trichoptera

    Directory of Open Access Journals (Sweden)

    Haase Peter

    2011-05-01

    Full Text Available Abstract Background Dispersal rates, i.e. the effective number of dispersing individuals per unit time, are the product of dispersal capacity, i.e. a species physiological potential for dispersal, dispersal behaviour, i.e. the decision to leave a habitat patch in favour of another, and connectivity of occupied habitat. Thus, dispersal of species that are highly specialised to a certain habitat is limited by habitat availability. Species inhabiting very stable environments may also adopt a sedentary life-style. Both factors should lead to strong genetic differentiation in highly specialised species inhabiting stable environments. These two factors apply to our model species Rhyacophila pubescens a highly specialised freshwater insect that occurs in tufa springs, a very stable habitat. Results We examined the genetic population structure and phylogeography using range-wide mtCOI sequence and AFLP data from 333 individuals of R. pubescens. We inferred the location of Pleistocene refugia and postglacial colonisation routes of R. pubescens, and examined ongoing local differentiation. Our results indicate intraregional differentiation with a high number of locally endemic haplotypes, that we attributed to habitat specificity and low dispersal rates of R. pubescens. We observed high levels of genetic diversity south of the Alps and genetic impoverishment north of the Alps. Estimates of migrants placed the refugium and the source of the colonisation in the Dauphiné Alps (SW Alps. Conclusions This is the first example of an aquatic insect with a colonisation route along the western margin of the Alps to the Central European highlands. The study also shows that specialisation to a stable environment may have promoted a behavioural shift to decreased dispersal rates, leading to stronger local population differentiation than in less specialised aquatic insects. Alternatively, the occurrence of highly specialised tufa spring habitats may have been more

  12. Avalanche risk assessment for mountain roads - a comparison of case studies from Iceland and the Alps

    Science.gov (United States)

    Wastl, M.; Stötter, J.

    2009-04-01

    While the management of alpine natural hazards in settlements follows highly developed operational standardised procedures in many countries, there are very few approaches for a systematic survey and assessment of these natural hazard processes and the related risks and for a sustainable planning of measures for roads. This is even more surprising against the background of the ongoing increase of traffic in Europe and its economic importance. This contribution compares the results of a regional scale assessment of the avalanche risk on mountain roads for case studies from Austria, Italy and Iceland. It provides the first assessment of the natural hazard situation for roads outside closed settlements in Iceland and discusses the applicability of regional scale risk based approaches developed in the Alps to the specific natural, economic and social situation. It also compares the role of risk in the assessment and management of natural hazards in these countries. The assessment of the risk by natural hazard processes for roads follows approaches developed by Wilhelm (1997, 1998, 1999) and Borter (1999a, 1999b) in the Alps adapted to comply with the data availability of the regional scale. These approaches distinguish between the individual risk on the one hand and the collective risk for the society on the other hand for each process area as well as the cumulative risk for the investigated road section. As the spatial and temporal distribution of avalanches is relatively well documented in some of the Alpine countries practical approaches have been developed for the assessment of this natural hazard process. These have been successfully applied e.g. to roads in inner Oetz and inner Stubai Valley, Tyrol, Austria by Huttenlau (2004) and Gufler (2007) and Sulden road, Ortles Alps, Southern Tyrol, Italy by Zischg et al. (2004). On the basis of these investigations the individual, collective and cumulative death risk for avalanches was determined for Siglufjar

  13. A permafrost distribution estimate for the Southern Alps, New Zealand, inferred from topoclimatic conditions at rock glacier sites

    Science.gov (United States)

    Sattler, Katrin; Mackintosh, Andrew; Anderson, Brian; Norton, Kevin; de Róiste, Mairead

    2014-05-01

    The presence of numerous rock glaciers and perennial snow patches indicate the existence of discontinuous alpine permafrost in New Zealand's Southern Alps. However, research on the geographic extent of permafrost in the South Island has been limited. Existing estimates are restricted to single mountain ranges or focus on steep bedrock permafrost. A recent global-scale estimate has not been evaluated by local observations. We present the results of a regional, spatially distributed permafrost estimate for the Southern Alps, focusing on debris-covered slopes. Permafrost distribution modelling was based on the statistical evaluation of 280 active and relict rock glaciers. Logistic regression identified characteristic topoclimatic conditions at the head area of presently active rock glaciers. Statistical relationships between permafrost presence, mean annual air temperature, and potential incoming solar radiation in snow-free months were subsequently used to calculate the spatially distributed probability of permafrost occurrence. The potential permafrost extent was delineated using a probability threshold of ≥ 0.6. Model results suggest that topoclimatic conditions are favourable for permafrost occurrence above ~ 2000 m a.s.l. in the central Southern Alps and above ~ 2150 m a.s.l. in the northern ranges. This gradient in permafrost altitude reflects the warmer climate at lower latitudes. Model results were locally validated by BTS (bottom temperature of snow cover) data derived from two-year continuous ground surface temperature (GST) measurements in the Ben Ohau Range, central Southern Alps. Applicability of BTS measurements for permafrost mapping had not been tested previously in the maritime setting of New Zealand, where common warm spells during winter can result in isothermal snow pack conditions, preventing the inference of late-winter equilibrium temperatures. BTS-indicated permafrost sites were in good agreement with modelled permafrost probabilities at the

  14. Low-Frequency Earthquakes of the Southern Alps, South Island, New Zealand

    Science.gov (United States)

    Chamberlain, C. J.; Shelly, D. R.; Townend, J.; Stern, T. A.

    2013-12-01

    Seismic tremor has a key role to play in our understanding of deep tectonic stresses and the transferal of these stresses to the shallow seismogenic crust. Documentation of tremor on the San Andreas Fault and the Alpine Fault provides new insight into the vertical extent of brittle behavior and ambient stress conditions near continental transform faults. Here we extend the previous analysis of tremor on the Alpine Fault, a ~600 km-long, dextral-reverse, transform fault forming the western boundary of the Southern Alps of New Zealand by documenting and locating low-frequency earthquakes (LFEs). We have initially focused on recognized periods of Alpine Fault tremor reported by Wech et al. (2012), using data from the Southern Alps Microearthquake Borehole Array (SAMBA; Boese et al., 2012) and the national seismic network, GeoNet. To identify LFEs, we use data from all stations at which tremor has been detected and require a minimum of five stations to show an LFE for it to be considered a reliable detection. In the first stage of the analysis, we identify LFE template events visually and locate these template events; we then apply a cross-correlation routine similar to that used for LFE detection in Japan and California (Shelly et al., 2009) in order to detect additional events and construct a homogeneous catalog. Due to the relatively large source-receiver and inter-station spacings (c. 20-100 km), we assume a LFE hypocenter near that of the corresponding template event and compute station delay factors. Using these delays, we then apply a finer cross-correlation routine to individual LFEs and locate these relative to the template event. The station distribution provided by SAMBA and GeoNet is not optimal for LFE detection, as all stations are situated north of the previously reported tremor locations. Nevertheless, our ability to identify LFEs on multiple, distant stations (>50 km epicentral distances) is promising for future investigations incorporating data from

  15. Calculation and visualisation of future glacier extent in the Swiss Alps by means of hypsographic modelling

    Science.gov (United States)

    Paul, F.; Maisch, M.; Rothenbühler, C.; Hoelzle, M.; Haeberli, W.

    2007-02-01

    The observed rapid glacier wastage in the European Alps during the past 20 years already has strong impacts on the natural environment (rock fall, lake formation) as well as on human activities (tourism, hydro-power production, etc.) and poses several new challenges also for glacier monitoring. With a further increase of global mean temperature in the future, it is likely that Alpine glaciers and the high-mountain environment as an entire system will further develop into a state of imbalance. Hence, the assessment of future glacier geometries is a valuable prerequisite for various impact studies. In order to calculate and visualize in a consistent manner future glacier extent for a large number of individual glaciers (> 100) according to a given climate change scenario, we have developed an automated and simple but robust approach that is based on an empirical relationship between glacier size and the steady-state accumulation area ratio (AAR 0) in the Alps. The model requires digital glacier outlines and a digital elevation model (DEM) only and calculates new glacier geometries from a given shift of the steady-state equilibrium line altitude (ELA 0) by means of hypsographic modelling. We have calculated changes in number, area and volume for 3062 individual glacier units in Switzerland and applied six step changes in ELA 0 (from + 100 to + 600 m) combined with four different values of the AAR 0 (0.5, 0.6, 0.67, 0.75). For an AAR 0 of 0.6 and an ELA 0 rise of 200 m (400 m) we calculate a total area loss of - 54% (- 80%) and a corresponding volume loss of - 50% (- 78%) compared to the 1973 glacier extent. In combination with a geocoded satellite image, the future glacier outlines are also used for automated rendering of perspective visualisations. This is a very attractive tool for communicating research results to the general public. Our study is illustrated for a test site in the Upper Engadine (Switzerland), where landscape changes above timberline play an

  16. Dams and Development in the French Alps in the Inter-war Period

    Directory of Open Access Journals (Sweden)

    Anne Dalmasso

    2009-03-01

    Full Text Available La vigueur de la « controverse des grands barrages » du début des années 2000 nous amène à nous interroger, dans cet article, sur les conditions de l’accueil fait aux barrages alpins lors de leur première phase de construction dans les années 1920 et 1930. Si l’ampleur des impacts, sociaux et environnementaux est différente, la nature des questions posées concernant les modes d’appropriation et d’usage de l’eau demeure. Au-delà des discours justificateurs ou accusateurs, structurés de façon pérenne autour de la promotion ou de la dénonciation des vertus de la modernisation et du développement, l’acceptabilité des barrages dépend d’abord des perturbations introduites dans la répartition des droits de propriétés et d’usages du territoire et de la capacité à compenser gains et pertes entre les groupes sociaux concernés. Ces questions sont travaillées à partir de deux cas de construction dans les Alpes françaises durant les années 1930, ceux du barrage du Chambon et du Sautet.The heated discussions and controversies over large dams that marked the start of the 21st century have led us in this article to examine the conditions under which Alpine dams were received during the first construction phase of the 1920s and 1930s. Although the extent of social and environ-mental impacts was not the same, the types of questions raised concerning methods of appropriation and uses to which water was put are similar. Among the arguments for and against, which always tend to be structured around the promotion or denunciation of the virtues of modernisation and development, the acceptability of dams depends firstly on the disturbances caused to the distribution of property rights and land usage rights and the ability to balance out gains and losses among the different social groups concerned. These questions are examined in the light of two dams constructed in the French Alps in the 1930s, the Chambon and Sautet dams.

  17. Rapid melting dynamics of the Morteratsch glacier (Swiss Alps) from UAV photogrammetry and field spectroscopy data

    Science.gov (United States)

    Di Mauro, Biagio; Garzonio, Roberto; Rossini, Micol; Baccolo, Giovanni; Julitta, Tommaso; Cavallini, Giuseppe; Mattavelli, Matteo; Colombo, Roberto

    2017-04-01

    The impact of atmospheric impurities on the optical properties of snow and ice has been largely acknowledged in the scientific literature. Beyond this, the evaluation of the effect of specific organic and inorganic particles on melting dynamics remains a major challenge. In this contribution, we examine the annual melting dynamics of a large valley glacier of the Swiss Alps using UAV photogrammetry. We then compare the melting patterns to the presence of surface impurities on the glacier surface. Two surveys (in July and September 2016) with a lightweight Unmanned Aerial Vehicle (UAV) were organized on the ablation zone of the Morteratsch glacier (Swiss Alps). The UAV (DJI, Phantom 4) was equipped with a high resolution digital camera, and flew at a constant altitude of 150 from the glacier surface. 30 ground control points were placed on the glacier, and their coordinates were determined with a differential GPS (dGPS) for georeferencing UAV images. Contemporary to the UAV surveys, field spectroscopy data were collected on the glacier surface with an Analytical Spectral Device (ASD Field spec.) spectrometer covering the visible and near infrared spectral ranges, and ice samples were collected to determine the abundance of microorganism and algae. From the UAV RGB data, two point clouds were created using Structure from Motion (SfM) algorithms. The point clouds (each consisting of about 15M points) were then converted in Digital Surface Models (DSM) and orthomosaics by interpolation. The difference between the two DSM was calculated and converted in Snow Water Equivalent (SWE), in order to assess the ice lost by the glacier during the ablation season. The point clouds were compared and the displacement vectors were estimated using different algorithms. The elevation changes estimated from UAV data were compared with the abundance of microorganisms and algae. The reflectance spectra of ice with microorganisms and algae show a chlorophyll absorption feature at 680 nm

  18. Analysis of ERT data of geoelectrical permafrost monitoring on Hoher Sonnblick (Austrian Central Alps)

    Science.gov (United States)

    Pfeiler, Stefan; Schöner, Wolfgang; Reisenhofer, Stefan; Ottowitz, David; Jochum, Birgit; Kim, Jung-Ho; Hoyer, Stefan; Supper, Robert; Heinrich, Georg

    2016-04-01

    In the Alps infrastructure facilities such as roads, routes or buildings are affected by the changes of permafrost, which often cause enormous reparation costs. Investigation on degradation of Alpine Permafrost in the last decade has increased, however, the understanding of the permafrost changes inducing its atmospheric forcing processes is still insufficient. Within the project ATMOperm the application of the geoelectrical method to estimate thawing layer thickness for mountain permafrost is investigated near the highest meteorological observatory of Austria on the Hoher Sonnblick. Therefore, it is necessary to further optimize the transformation of ERT data to thermal changes in the subsurface. Based on an innovative time lapse inversion routine for ERT data (Kim J.-H. et al 2013) a newly developed data analysis software tool developed by Kim Jung-Ho (KIGAM) in cooperation with the Geophysics group of the Geological Survey of Austria allows the statistical analysis of the entire sample set of each and every data point measured by the geoelectrical monitoring instrument. This gives on the one hand of course an enhanced opportunity to separate between „good" and „bad" data points in order to assess the quality of measurements. On the other hand, the results of the statistical analysis define the impact of every single data point on the inversion routine. The interpretation of the inversion results will be supplemented by temperature logs from selected boreholes along the ERT profile as well as climatic parameters. KIM J.-H., SUPPER R., TSOURLOS P. and YI M.-J.: Four-dimensional inversion of resistivity monitoring data through Lp norm minimizations. - Geophysical Journal International, 195(3), 1640-1656, 2013. Doi: 10.1093/gji/ggt324. (No OA) Acknowledgments: The geoelectrical monitoring on Hoher Sonnblick has been installed and is operated in the frame of the project ATMOperm (Atmosphere - permafrost relationship in the Austrian Alps - atmospheric extreme

  19. Monitoring seasonal dust depositions on snow in a high-altitude site of the European Alps

    Science.gov (United States)

    Di Mauro, Biagio; Filippa, Gianluca; Pogliotti, Paolo; Galvagno, Marta; Morra di Cella, Umberto; Cremonese, Edoardo; Isabellon, Michel; Rossini, Micol; Garzonio, Roberto; Gramegna, Gianluca; Colombo, Roberto

    2017-04-01

    The seasonal input of mineral dust from Saharan desert impacts the optical properties of snow in the European Alps. The albedo reduction may alter the melting dynamics of the snowpack, resulting in earlier snow melts. In this contribution, we evaluate the impact of dust depositions on snowpack melting dynamics in a high-altitude site (2160 m) in the northwestern Italian Alps (Aosta Valley, IT). In particular, we focus on the two following specific objectives: i) to assess the potential of a spectral index derived from digital camera images to identify the occurrence of dust deposition events; ii) to evaluate the impact of dust depositions on snow melting based on the comparison between observed snow height and the potential snow height simulated with a hydrological model not accounting for melting caused by snow impurities. The experimental site is equipped with instruments that measure snow albedo (Kipp and Zonen cnr4 net radiometer), snow height (SR50A, Campbell Scientific, Inc), air temperature (HMP45, Vaisala Inc.) and surface temperature (SI-111, Apogee Instr. Inc.). Furthermore, a Nikon digital camera (model d5000) is installed at the site. The camera collects images in JPEG format and features a resolution of 12.3 megapixels, with three color channels (namely Red, Green and Blue). Data were collected from 10 am to 5 pm, with an hourly temporal resolution. Data from 2013 to 2016 are presented here. The seasonality and timing of dust depositions were determined using two atmospheric transport models: the NAAPS and the BSC-DREAM8 model. Dust depositions were compared with time series of the Snow Darkening Index (SDI) calculated from the channels of the digital camera, combining the Red and Green channels as a normalized difference. SDI time series were extracted from the repeated images using the Phenopix R package (https://r-forge.r-project.org/projects/phenopix/). The impact of dust deposition on snow melt was evaluated by comparing the observed snow height

  20. Future snowfall in the Alps: projections based on the EURO-CORDEX regional climate models

    Directory of Open Access Journals (Sweden)

    P. Frei

    2018-01-01

    Full Text Available Twenty-first century snowfall changes over the European Alps are assessed based on high-resolution regional climate model (RCM data made available through the EURO-CORDEX initiative. Fourteen different combinations of global and regional climate models with a target resolution of 12 km and two different emission scenarios are considered. As raw snowfall amounts are not provided by all RCMs, a newly developed method to separate snowfall from total precipitation based on near-surface temperature conditions and accounting for subgrid-scale topographic variability is employed. The evaluation of the simulated snowfall amounts against an observation-based reference indicates the ability of RCMs to capture the main characteristics of the snowfall seasonal cycle and its elevation dependency but also reveals considerable positive biases especially at high elevations. These biases can partly be removed by the application of a dedicated RCM bias adjustment that separately considers temperature and precipitation biases.Snowfall projections reveal a robust signal of decreasing snowfall amounts over most parts of the Alps for both emission scenarios. Domain and multi-model mean decreases in mean September–May snowfall by the end of the century amount to −25 and −45 % for representative concentration pathway (RCP scenarios RCP4.5 and RCP8.5, respectively. Snowfall in low-lying areas in the Alpine forelands could be reduced by more than −80 %. These decreases are driven by the projected warming and are strongly connected to an important decrease in snowfall frequency and snowfall fraction and are also apparent for heavy snowfall events. In contrast, high-elevation regions could experience slight snowfall increases in midwinter for both emission scenarios despite the general decrease in the snowfall fraction. These increases in mean and heavy snowfall can be explained by a general increase in winter precipitation and by the fact that, with

  1. Local Environmental Factors Drive Divergent Grassland Soil Bacterial Communities in the Western Swiss Alps.

    Science.gov (United States)

    Yashiro, Erika; Pinto-Figueroa, Eric; Buri, Aline; Spangenberg, Jorge E; Adatte, Thierry; Niculita-Hirzel, Hélène; Guisan, Antoine; van der Meer, Jan Roelof

    2016-11-01

    Mountain ecosystems are characterized by a diverse range of climatic and topographic conditions over short distances and are known to shelter a high biodiversity. Despite important progress, still little is known on bacterial diversity in mountain areas. Here, we investigated soil bacterial biogeography at more than 100 sampling sites randomly stratified across a 700-km 2 area with 2,200-m elevation gradient in the western Swiss Alps. Bacterial grassland communities were highly diverse, with 12,741 total operational taxonomic units (OTUs) across 100 sites and an average of 2,918 OTUs per site. Bacterial community structure was correlated with local climatic, topographic, and soil physicochemical parameters with high statistical significance. We found pH (correlated with % CaO and % mineral carbon), hydrogen index (correlated with bulk gravimetric water content), and annual average number of frost days during the growing season to be among the groups of the most important environmental drivers of bacterial community structure. In contrast, bacterial community structure was only weakly stratified as a function of elevation. Contrasting patterns were discovered for individual bacterial taxa. Acidobacteria responded both positively and negatively to pH extremes. Various families within the Bacteroidetes responded to available phosphorus levels. Different verrucomicrobial groups responded to electrical conductivity, total organic carbon, water content, and mineral carbon contents. Alpine grassland bacterial communities are thus highly diverse, which is likely due to the large variety of different environmental conditions. These results shed new light on the biodiversity of mountain ecosystems, which were already identified as potentially fragile to anthropogenic influences and climate change. This article addresses the question of how microbial communities in alpine regions are dependent on local climatic and soil physicochemical variables. We benefit from a unique 700

  2. Glacier albedo decrease in the European Alps: potential causes and links with mass balances

    Science.gov (United States)

    Di Mauro, Biagio; Julitta, Tommaso; Colombo, Roberto

    2016-04-01

    Both mountain glaciers and polar ice sheets are losing mass all over the Earth. They are highly sensitive to climate variation, and the widespread reduction of glaciers has been ascribed to the atmospheric temperature increase. Beside this driver, also ice albedo plays a fundamental role in defining mass balance of glaciers. In fact, dark ice absorbs more energy causing faster glacier melting, and this can drive to more negative balances. Previous studies showed that the albedo of Himalayan glaciers and the Greenland Ice Sheet is decreasing with important rates. In this contribution, we tested the hypothesis that also glaciers in the European Alps are getting darker. We analyzed 16-year time series of MODIS (MODerate resolution Imaging Spectrometer) snow albedo from Terra (MOD13A1, 2000-2015) and Aqua (MYD13A1, 2002-2015) satellites. These data feature a spatial resolution of 500m and a daily temporal resolution. We evaluated the existence of a negative linear and nonlinear trend of the summer albedo values both at pixel and at glacier level. We also calculated the correlation between MODIS summer albedo and glacier mass balances (from the World Glaciological Monitoring Service, WGMS database), for all the glaciers with available mass balance during the considered period. In order to estimate the percentage of the summer albedo that can be explained by atmospheric temperature, we correlated MODIS albedo and monthly air temperature extracted from the ERA-Interim reanalysis dataset. Results show that decreasing trends exist with a strong spatial variability in the whole Alpine chain. In large glaciers, such as the Aletch (Swiss Alps), the trend varies significantly also within the glacier, showing that the trend is higher in the area across the accumulation and ablation zone. Over the 17 glaciers with mass balance available in the WGMS data set, 11 gave significant relationship with the MODIS summer albedo. Moreover, the comparison between ERA-Interim temperature

  3. Future snowfall in the Alps: projections based on the EURO-CORDEX regional climate models

    Science.gov (United States)

    Frei, Prisco; Kotlarski, Sven; Liniger, Mark A.; Schär, Christoph

    2018-01-01

    Twenty-first century snowfall changes over the European Alps are assessed based on high-resolution regional climate model (RCM) data made available through the EURO-CORDEX initiative. Fourteen different combinations of global and regional climate models with a target resolution of 12 km and two different emission scenarios are considered. As raw snowfall amounts are not provided by all RCMs, a newly developed method to separate snowfall from total precipitation based on near-surface temperature conditions and accounting for subgrid-scale topographic variability is employed. The evaluation of the simulated snowfall amounts against an observation-based reference indicates the ability of RCMs to capture the main characteristics of the snowfall seasonal cycle and its elevation dependency but also reveals considerable positive biases especially at high elevations. These biases can partly be removed by the application of a dedicated RCM bias adjustment that separately considers temperature and precipitation biases.Snowfall projections reveal a robust signal of decreasing snowfall amounts over most parts of the Alps for both emission scenarios. Domain and multi-model mean decreases in mean September-May snowfall by the end of the century amount to -25 and -45 % for representative concentration pathway (RCP) scenarios RCP4.5 and RCP8.5, respectively. Snowfall in low-lying areas in the Alpine forelands could be reduced by more than -80 %. These decreases are driven by the projected warming and are strongly connected to an important decrease in snowfall frequency and snowfall fraction and are also apparent for heavy snowfall events. In contrast, high-elevation regions could experience slight snowfall increases in midwinter for both emission scenarios despite the general decrease in the snowfall fraction. These increases in mean and heavy snowfall can be explained by a general increase in winter precipitation and by the fact that, with increasing temperatures

  4. Holocene climate variability from Rio Martino cave (Western Alps, Northern Italy)

    Science.gov (United States)

    Regattieri, Eleonora; Zanchetta, Giovanni; Isola, Ilaria; Drysdale, Russell; Hellstrom, John; Dallai, luigi; Baneschi, Ilaria; Magri, Federico

    2013-04-01

    The Alpine region currently experiences complex climatic conditions (Efthymidias et al., 2007). Such a complexity is also apparent during the Holocene, as revealed by the isotopic composition of speleothems (e.g. Spötl et al., 2010). However, virtually no speleothem data are available from the western Alps, which are dominated by North Atlantic synoptic systems. With this in mind, several flowstone cores were retrieved in Rio Martino Cave (Piemonte, Northern Italy, ca. 1530 m asl). A large part of the cave's catchment was substantially glaciated until the end of the Younger Dryas. U/Th dating of three different flowstones indicates that deposition started at the beginning of the Holocene and covered a thick deposit of cemented sand and gravels probably related to the last deglaciation. The combined δ18O record of different flowstones shows substantial variability through the Holocene, both on millennial and century time scales. Relatively low δ18O values last until ca. 6 ka. From 6 to 3 ka, the δ18O increases gradually before decreasing again from 3 ka to the present. This long-term trend may be related to changes in the seasonal patterns of precipitation, as suggested for the lake level record at Ledro (Magny et al., 2012). Superimposed on this trend there are several short-term oscillations which may reflect alternating periods of drier and wetter conditions. Some of these episodes are also in agreement with changes documented at Ledro. Efthymidias D., et al., 2007. Influence of large-scale atmospheric circulation on climate variability in the Greater Alpine Region of Europe. Journal of Geophysical Research, 112, D12104. Magny M. et al., 2012. Holocene palaeohydrological changes in the northern Mediterranean borderlands as reflected by the lake-level record of Lake Ledro, northeastern Italy. Quaternary Research, 77, 382-396 Spötl, C., et al., 2010. Humid climate during deposition of sapropel 1 in the Mediterranean Sea: Assessing the influence on the Alps

  5. Isolated, but transnational: the glocal nature of Waldensian ethnobotany, Western Alps, NW Italy.

    Science.gov (United States)

    Bellia, Giada; Pieroni, Andrea

    2015-05-07

    An ethnobotanical field study on the traditional uses of wild plants for food as well as medicinal and veterinary plants was conducted in four Waldensian valleys (Chisone, Germanasca, Angrogna, and Pellice) in the Western Alps, Piedmont, NW Italy. Waldensians represent a religious Protestant Christian minority that originated in France and spread around 1,170 AD to the Italian side of Western Alps, where, although persecuted for centuries, approximately 20,000 believers still survive today, increasingly mixing with their Catholic neighbours. Interviews with a total of 47 elderly informants, belonging to both Waldensian and Catholic religious groups, were undertaken in ten Western Alpine villages, using standard ethnobotanical methods. The uses of 85 wild and semi-domesticated food folk taxa, 96 medicinal folk taxa, and 45 veterinary folk taxa were recorded. Comparison of the collected data within the two religious communities shows that Waldensians had, or have retained, a more extensive ethnobotanical knowledge, and that approximately only half of the wild food and medicinal plants are known and used by both communities. Moreover, this convergence is greater for the wild food plant domain. Comparison of the collected data with ethnobotanical surveys conducted at the end of the 19th Century and the 1980s in one of studied valleys (Germanasca) shows that the majority of the plants recorded in the present study are used in the same or similar ways as they were decades ago. Idiosyncratic plant uses among Waldensians included both archaic uses, such as the fern Botrychium lunaria for skin problems, as well as uses that may be the result of local adaptions of Central and Northern European customs, including Veronica allionii and V. officinalis as recreational teas and Cetraria islandica in infusions to treat coughs. The great resilience of plant knowledge among Waldensians may be the result of the long isolation and history of marginalisation that this group has faced

  6. Modelling the impact of vegetation on marly catchments in the Southern Alps of France

    Science.gov (United States)

    Carriere, Alexandra; Le Bouteiller, Caroline; Tucker, Greg; Naaim, Mohamed

    2017-04-01

    The Southern Alps of France have been identified as a hot-spot in a global climate change context where the rainfall intensity increase may exacerbate the erosion of already badly erodible lands: Badlands. Vegetalization methods are a promising area of research for erosion control and slope and riverbed stabilization. Nevertheless the impact of vegetation on erosive dynamics is still poorly understood. We own data collected over the last thirty years on marly catchments in the Southern Alps of France from the Draix-Bléone Observatory, part of the Network of Drainage Basins RBV. These are temporal data of sedimentary flux at the scale of the precipitation event but also more recent topographic data on watersheds with areas ranging from 10-3 square kilometers to twenty square kilometers. Erosion rates in this landscape reach 1 cm per year. We simulate the topographic evolution of the catchments over a few decades to centuries with the landscape evolution model Landlab, using our data to calibrate and explicitly validate the model. This model, in comparison with other landscape evolution models, incorporates a more advanced vegetation module in terms of ecology. Nevertheless the erosion-vegetation coupling is not present in Landlab and we are working on its construction. To this end we use an erosion module and a vegetation module that we seek to couple. We want to see how the erosion laws parameters depend on the vegetation cover. We have implemented the calibration of parameters of a non-linear diffusion module coupled with a transport-limited law by comparing the simulated annual sediment flux with the one of the data of the observatory as a function of the percentage of vegetation cover of the ground. We obtained average values of parameters adjusted according to vegetation cover. We observe that the values of the erosion laws parameters are strongly affected by the percentage of vegetation cover. We will then spatialize these parameters on our vegetation maps in

  7. Climate change in the Alps: impacts and natural risks. ONERC's Technical Report N.1; Changement climatiques dans les Alpes: Impacts et risques naturels. Rapport Technique N.1 de l'ONERC

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2008-07-01

    Mountain ranges are very sensitive to climatic variations. The impacts of climate change on theses territories can be various, from the modification of the biodiversity to the permafrost melting and the evolution of natural hazards. The assessment of temperature rise and its impacts on mountains constitutes an important issue considering the strong uncertainties and the specific sensitivity linked to these areas. The territorial manager - policy makers and technicians - have to deal with this questioning for the implementation of short term actions as well as for strategic choices in terms of land planning and spatial development. This is why 22 public institutions from seven Alpine countries were involved in the European ClimChAlp project. The ONERC participated actively to this project in collaboration with the Rhone-Alpes Region and the Pole Grenoblois Risques Naturels. This report is based on the synthesis realised by the French partners to propose a common base of knowledge about climate change and its impacts in the Alps. (authors)

  8. Saharan dust particles in snow samples of Alps and Apennines during an exceptional event of transboundary air pollution.

    Science.gov (United States)

    Telloli, Chiara; Chicca, Milvia; Pepi, Salvatore; Vaccaro, Carmela

    2017-12-21

    Southern European countries are often affected in summer by transboundary air pollution from Saharan dust. However, very few studies deal with Saharan dust pollution at high altitudes in winter. In Italy, the exceptional event occurred on February 19, 2014, colored in red the entire mountain range (Alps and Apennines) and allowed to characterize the particulate matter deposited on snow from a morphological and chemical point of view. Snow samples were collected after this event in four areas in the Alps and one in the Apennines. The particulate matter of the melted snow samples was analyzed by scanning electron microscopy with energy dispersive X-ray spectrometry (SEM-EDS) and by inductively coupled plasma mass spectrometry (ICP-MS). These analyses confirmed the presence of Saharan dust particle components in all areas with similar percentages, supported also by the positive correlations between Mg-Ca, Al-Ca, Al-Mg, and Al-K in all samples.

  9. Variation in the chloroplast DNA of Swiss stone pine (Pinus cembra L.) reflects contrasting post-glacial history of populations from the Carpathians and the Alps

    OpenAIRE

    Höhn, Mária; Gugerli, Felix; Abran, Peter; Bisztray, György; Buonamici, Anna; Cseke, Klára; Hufnagel, Levente; Quintela-Sabarís, Celestino; Sebastiani, Federico; Vendramin, Giovanni Giuseppe

    2009-01-01

    To characterize the genetic structure and diversity of Pinus cembra L. populations native to two disjunct geographical areas, the Alps and the Carpathians, and to evaluate the rate of genetic differentiation among populations.

  10. Chernobyl, 30 years after? Analysis of levels of artificial radioactivity of soils in the Alps in 2015. Analyses and comments report

    International Nuclear Information System (INIS)

    Rougier, G.; Bernollin, A.; Barbey, P.; Boilley, D.; Josset, M.; Paris, A.; Dunand, E.

    2015-01-01

    This report presents radioactivity measurements performed in soil samplings (70 square centimetres, 15 to 20 cm deep core sampling) in several sites located in the French Alps, more particularly in the Hautes-Alpes district (col de Rabou in the Devoluy massif, both sides of the col de la Pisse in the Champsaur, near Gap, Grand Morgon, col de Chorges, col d'Izoard), in the Drome district (different places about Lus-la-Croix-Haute), in the Alpes-de-Haute-Provence district (col de Fontbelle, col de Restefond), in the Savoy district (col du Galibier, Mont-Cenis), and in the Alpes Maritimes district (Le Boreon). It appears that some high levels of caesium-137 contamination are mainly due to Chernobyl, and, to lesser extent, to French nuclear tests. Associated exposure doses are assessed

  11. Stress field variations in the Swiss Alps and the northern Alpine foreland derived from inversion of fault plane solutions

    Science.gov (United States)

    Kastrup, U.; Zoback, M.L.; Deichmann, N.; Evans, Kenneth F.; Giardini, D.; Michael, A.J.

    2004-01-01

    This study is devoted to a systematic analysis of the state of stress of the central European Alps and northern Alpine foreland in Switzerland based on focal mechanisms of 138 earthquakes with magnitudes between 1 and 5. The most robust feature of the results is that the azimuth of the minimum compressive stress, S3, is generally well constrained for all data subsets and always lies in the NE quadrant. However, within this quadrant, the orientation of S3 changes systematically both along the structural strike of the Alpine chain and across it. The variation in stress along the mountain belt from NE to SW involves a progressive, counterclockwise rotation of S3 and is most clear in the foreland, where it amounts to 45??-50??. This pattern of rotation is compatible with the disturbance to the stress field expected from the indentation of the Adriatic Block into the central European Plate, possibly together with buoyancy forces arising from the strongly arcuate structure of the Moho to the immediate west of our study area. Across the Alps, the variation in azimuth of S3 is defined by a progressive, counterclockwise rotation of about 45?? from the foreland in the north across the Helvetic domain to the Penninic nappes in the south and is accompanied by a change from a slight predominance of strike-slip mechanisms in the foreland to a strong predominance of normal faulting in the high parts of the Alps. The observed rotation can be explained by the perturbation of the large-scale regional stress by a local uniaxial deviatoric tension with a magnitude similar to that of the regional differential stress and with an orientation perpendicular to the strike of the Alpine belt. The tensile nature and orientation of this stress is consistent with the "spreading" stress expected from lateral density changes due to a crustal root beneath the Alps. Copyright 2004 by the American Geophysical Union.

  12. Contrasting styles of (U)HP rock exhumation along the Cenozoic Adria-Europe plate boundary (Western Alps, Calabria, Corsica)

    Science.gov (United States)

    Malusà, Marco G.; Faccenna, Claudio; Baldwin, Suzanne L.; Fitzgerald, Paul G.; Rossetti, Federico; Balestrieri, Maria Laura; Danišík, Martin; Ellero, Alessandro; Ottria, Giuseppe; Piromallo, Claudia

    2015-06-01

    Since the first discovery of ultrahigh pressure (UHP) rocks 30 years ago in the Western Alps, the mechanisms for exhumation of (U)HP terranes worldwide are still debated. In the western Mediterranean, the presently accepted model of synconvergent exhumation (e.g., the channel-flow model) is in conflict with parts of the geologic record. We synthesize regional geologic data and present alternative exhumation mechanisms that consider the role of divergence within subduction zones. These mechanisms, i.e., (i) the motion of the upper plate away from the trench and (ii) the rollback of the lower plate, are discussed in detail with particular reference to the Cenozoic Adria-Europe plate boundary, and along three different transects (Western Alps, Calabria-Sardinia, and Corsica-Northern Apennines). In the Western Alps, (U)HP rocks were exhumed from the greatest depth at the rear of the accretionary wedge during motion of the upper plate away from the trench. Exhumation was extremely fast, and associated with very low geothermal gradients. In Calabria, HP rocks were exhumed from shallower depths and at lower rates during rollback of the Adriatic plate, with repeated exhumation pulses progressively younging toward the foreland. Both mechanisms were active to create boundary divergence along the Corsica-Northern Apennines transect, where European southeastward subduction was progressively replaced along strike by Adriatic northwestward subduction. The tectonic scenario depicted for the Western Alps trench during Eocene exhumation of (U)HP rocks correlates well with present-day eastern Papua New Guinea, which is presented as a modern analog of the Paleogene Adria-Europe plate boundary.

  13. Tree-Ring Reconstruction of Debris-Flow Events Leading to Overbank Sedimentation on the Illgraben Cone (Valais Alps, Switzerland)

    OpenAIRE

    Stoffel, Markus; Bollschweiler, Michelle; Leutwiler, Astrid; Aeby, Patrick

    2008-01-01

    Dendrogeomorphological analyses of trees affected by debris flows have regularly been used to date past events. However, while previous studies in the Swiss Alps have focused primarily on granitic and gneissic debris-flow material and on Larix decidua Mill. and Picea abies (L.) Karst. trees, they have – at the same time – widely disregarded torrents dominated by finely fractured calcareous and dolomitic lithologies and forests populated with Pinus sylvestris L. In this paper, we report on res...

  14. The Changes of Bone-Specific Alkaline Phosphatase (BsALP)Associated With Callus Formation and Rate of Bone Healing

    OpenAIRE

    Muljačić, Ante; Poljak-Guberina, Renata; Turčić, Josip; Živković, Ognjen; Guberina, Marko; Klaić, Boris

    2010-01-01

    The aim of this study was to examine whether the volume of bone-specific alkaline phosphatase (BsALP) as a biochemical parameter in the early posttraumatic phase may indicate the speed of fracture healing. The evaluation of the bone healing process has been based on the patient's subjective statement and radiographic findings. The activity of bone-specific alkaline phosphatase has been measured in the sera of 41 patients who have been diagnosed with fractures of long bones. All th...

  15. 10Be exposure dating of the timing of Neoglacial glacier advances in the Ecrins-Pelvoux massif, southern French Alps

    Science.gov (United States)

    Le Roy, Melaine; Deline, Philip; Carcaillet, Julien; Schimmelpfennig, Irene; Ermini, Magali; Aster Team

    2017-12-01

    Alpine glacier variations are known to be reliable proxies of Holocene climate. Here, we present a terrestrial cosmogenic nuclide (TCN)-based glacier chronology relying on 24 new 10Be exposure ages, which constrain maximum Neoglacial positions of four small to mid-sized glaciers (Rateau, Lautaret, Bonnepierre and Etages) in the Ecrins-Pelvoux massif, southern French Alps. Glacier advances, marked by (mainly lateral) moraine ridges that are located slightly outboard of the Little Ice Age (LIA, c. 1250-1860 AD) maximum positions, were dated to 4.25 ± 0.44 ka, 3.66 ± 0.09 ka, 2.09 ± 0.10 ka, c. 1.31 ± 0.17 ka and to 0.92 ± 0.02 ka. The '4.2 ka advance', albeit constrained by rather scattered dates, is to our knowledge exposure-dated here for the first time in the Alps. It is considered as one of the first major Neoglacial advance in the western Alps, in agreement with other regional paleoclimatological proxies. We further review Alpine and Northern Hemisphere mid-to-high latitude evidence for climate change and glacier activity concomitant with the '4.2 ka event'. The '2.1 ka advance' was not extensively dated in the Alps and is thought to represent a prominent advance in early Roman times. Other Neoglacial advances dated here match the timing of previously described Alpine Neoglacial events. Our results also suggest that a Neoglacial maximum occurred at Etages Glacier 0.9 ka ago, i.e. during the Medieval Climate Anomaly (MCA, c. 850-1250 AD). At Rateau Glacier, discordant results are thought to reflect exhumation and snow cover of the shortest moraine boulders. Overall, this study highlights the need to combine several sites to develop robust Neoglacial glacier chronologies in order to take into account the variability in moraine deposition pattern and landform obliteration and conservation.

  16. The Late Miocene to recent erosion pattern of the Alpine foreland basin reflects Eurasian slab-unloading beneath the western Alps rather than global climate change

    Science.gov (United States)

    Friedrich, Anke; Schlunegger, Fritz; Baran, Ramona

    2014-05-01

    It has been proposed that mountainous erosion increased globally around 5 Ma in response to global climate change, mainly because this increase coincides with a cooling trend indicated by global isotopic data (e.g., Herman et al. 2013). The Alps have played a prominent role in this debate. Published sedimentary budgets for the western and eastern Alps for the past 35 Ma show a substantial increase in the erosion of the Alps at c. 5 Ma (e.g., Kuhlemann, 2000). This temporal coincidence was used to call for a climate driver, mainly because this increase was not accompanied by tectonic convergence across the Alps during this time period. However, several authors emphasized the importance of lithospheric-scale processes beneath the Alps, which could also explain the increase in erosion rates through surface uplift. To provide a new perspective on this debate, we synthesized a spatial gradient map of erosion rates for the Alps and the entire Alpine foreland basin. Our data base consists of published (1) apatite fission-track (AFT) cooling ages for the Alps (e.g., Vernon et al. 2008; Luth and Willingshofer 2008; Wölfler et al. 2012; (2) AFT ages from wells from the Swiss foreland basin (e.g., Cederbom et al. 2011), and (3) stratigraphic data from industry wells in the German and Austrian foreland basin (e.g., Lemcke 1974; Genser et al. 2007). We focus our analysis on the shape and scale of the areas undergoing erosion since 5 Ma. Our synthesis of published denudation rate data for the past 5 Million years reveals that erosion of the Alpine foreland basin is highest in front of the western Alps (between 2 and 0.6 km), and decreases eastward over a distance of 700 km to the Austrian foreland basin (c. 200 m). For the western Alps, the compilation of apatite-fission-track ages yields erosion rates > 0.6 km/Ma, while erosion rates for the eastern foreland basin and the adjacent eastern Alps are slab along the Eurasian-Adriatic plate boundary. This mechanism triggered large

  17. Investigations on socio economic indicators of French Alps ski industry from an explicit spatial modelling of managed snow on ski slopes

    Science.gov (United States)

    Spandre, Pierre; François, Hugues; Morin, Samuel; George-Marcelpoil, Emmanuelle; Lafaysse, Matthieu

    2017-04-01

    Investigations of the capacity of ski resorts to anticipate, cope with and recover from the impact of natural snow scarcity through snow management (grooming, snowmaking) have been realized in most of the major regions in terms of international ski offer although not in the French Alps hitherto. The present work therefore introduces an innovative approach for the investigation of socio economic implications of changes in snow conditions for the French Alps ski resorts based on a panel of 129 resorts representing 96% of the total French Alps ski lifts infrastructures. We integrated detailed spatial representations of ski resorts (including priority areas for snowmaking equipment) along with physically based snowpack modelling (including the physical impact of grooming and snowmaking). The viability of ski resorts was further adressed thanks to a commonly used rule based on the snow season duration at the village and ski lifts average elevations along with the development of original viability indicators of snow conditions in the French Alps ski resorts based on the specific periods for the economic success of winter sports: Christmas and February school holidays. Such indicators were correlated to the number of ski lifts tickets sales over the 2001 - 2014 period and proved to be relevant to investigate and predict the evolutions of ski lifts tickets sales under the current ski market conditions in the French Alps. Our results outlined the contrast of snow conditions between French Alps ski resorts, even when accounting for snow management, particularly regarding the geographical location of resorts (Southern versus Northern Alps), the size and related elevation range of ski resorts. Our physically based approach also allowed to compute the water and energy requirements for the production of Machine Made snow since the start of the development of snowguns in the French Alps. Our computations proved to be strongly correlated to the observed amounts of water from the

  18. Radiocarbon ages of soil charcoals from the southern Alps, Ticino, Switzerland

    International Nuclear Information System (INIS)

    Hajdas, Irka; Schlumpf, Nadia; Minikus-Stary, Nicole; Hagedorn, Frank; Eckmeier, Eileen; Schoch, Werner; Burga, Conradin; Bonani, Georges; Schmidt, Michael W.I.; Cherubini, Paolo

    2007-01-01

    Radiocarbon dating of macroscopic charcoal is a useful tool for paleoclimatic and paleoecologic reconstructions. Here we present results of 14 C dating of charcoals found in charcoal-rich soils of Ticino and the Misox Valley (southern Switzerland) which indicate that the Late Glacial and early Holocene fires coincided with warm phases in the North Atlantic region and low lake levels in the Central Europe. Late Holocene charcoals found in these soils document an earlier than believed presence of sweet chestnut (Castanea sativa Mill.) in southern Switzerland. Sweet chestnut trees play a key role in Mediterranean woodlands, and for longer than two millennia have been used as a food source. Based on palynological evidence it is commonly believed that in southern Switzerland C. sativa was first introduced 2000 years ago by the Romans, who cultivated it for wood and fruit production. Our results indicate that this tree species was present on the southern slopes of the Alps ∼1500 years earlier than previously assumed, and therefore was likely introduced independently from cultivation by the Romans

  19. Alps, Carpathians and Dinarides-Hellenides: about plates, micro-plates and delaminated crustal blocks

    Science.gov (United States)

    Schmid, Stefan

    2014-05-01

    Before the onset of Europe-Africa continental collision in the Dinarides-Hellenides (around 60Ma) and in the Alps and Western Carpathians (around 35 Ma), and at a large scale, the dynamics of orogenic processes in the Mediterranean Alpine chains were governed by Europe-Africa plate convergence leading to the disappearance of large parts of intervening oceanic lithosphere, i.e. the northern branch of Neotethys along the Sava-Izmir-Ankara suture and Alpine Tethys along the Valais-Magura suture (Schmid et al. 2008). In spite of this, two major problems concerning the pre-collisional stage are still poorly understood: (1) by now we only start to understand geometry, kinematics and dynamics of the along-strike changes in the polarity of subduction between Alps-Carpathians and Dinarides-Hellenides, and (2) it is not clear yet during exactly which episodes and to what extent intervening rifted continental fragments such as, for example, Iberia-Briançonnais, Tisza, Dacia, Adria-Taurides moved independently as micro-plates, and during which episodes they remained firmly attached to Europa or Africa from which they broke away. As Europe-Africa plate convergence slowed down well below 1 cm/yr at around 30 Ma ago these pre-collisional processes driven by plate convergence on a global scale gave way to more local processes of combined roll-back and crustal delamination in the Pannonian basin of the Carpathian embayment and in the Aegean (as well as in the Western Mediterranean, not discussed in this contribution). In the case of the Carpathian embayment E-directed roll back totally unrelated to Europe-Africa N-S-directed convergence, started at around 20 Ma ago, due to the presence relict oceanic lithosphere in the future Pannonian basin that remained un-subducted during collision. Due to total delamination of the crust from the eastward rolling back European mantle lithosphere the anticlockwise rotating ALCAPA crustal block, consisting of Eastern Alps and Western Carpathian

  20. Occurrence of PAH in the seasonal snowpack of the Eastern Italian Alps

    International Nuclear Information System (INIS)

    Gabrieli, Jacopo; Decet, Fabio; Luchetta, Alberto; Valt, Mauro; Pastore, Paolo; Barbante, Carlo

    2010-01-01

    PAH concentrations have been determined in 47 seasonal snowpack samples collected in the Valbelluna valley and in the Bellunesi Dolomites National Park, in the Italian North-Eastern Alps, during the winter of 2005. The ΣPAH concentration in high-altitude alpine sites (above 1700 m) was 32 ± 20 ng/kg while in valley bottom urban areas it was 165 ± 54 ng/kg with maximum values of 290 ng/kg. The GIS mapping technique was employed to produce a PAH spatial distribution. The urbanized Valbelluna valley, and in particular the SW part, had the highest accumulation of all PAH, with values an order of magnitude more than those in rural and alpine areas. This behaviour is consistent with urban air quality data, and is due to geo-morphological and meteorological factors such as the deeper shape of the valley at the position of the town of Feltre and the low altitude of the boundary layer during the winter season. - PAH concentrations determined in seasonal snow represent an integration of the winter depositions and can be used to evaluate the pollution levels in an Alpine region.

  1. Relating safety, productivity and company type for motor-manual logging operations in the Italian Alps.

    Science.gov (United States)

    Montorselli, Niccolò Brachetti; Lombardini, Carolina; Magagnotti, Natascia; Marchi, Enrico; Neri, Francesco; Picchi, Gianni; Spinelli, Raffaele

    2010-11-01

    The study compared the performance of four different logging crews with respect to productivity, organization and safety. To this purpose, the authors developed a data collection method capable of providing a quantitative analysis of risk-taking behavior. Four crews were tested under the same working conditions, representative of close-to-nature alpine forestry. Motor-manual working methods were applied, since these methods are still prevalent in the specific study area, despite the growing popularity of mechanical processors. Crews from public companies showed a significantly lower frequency of risk-taking behavior. The best safety performance was offered by the only (public) crew that had been administered formal safety training. The study seems to deny the common prejudice that safety practice is inversely proportional to productivity. Instead, productivity is increased by introducing more efficient working methods and equipment. The quantitative analysis of risk-taking behavior developed in this study can be applied to a number of industrial fields besides forestry. Characterizing risk-taking behavior for a given case may eventually lead to the development of custom-made training programmes, which may address problem areas while avoiding that the message is weakened by the inclusion of redundant information. In the specific case of logging crews in the central Alps, the study suggests that current training courses may be weak on ergonomics, and advocates a staged training programme, focusing first on accident reduction and then expanding to the prevention of chronic illness. 2010 Elsevier Ltd. All rights reserved.

  2. Retrieval of the ultraviolet effective snow albedo during 1998 winter campaign in the French Alps.

    Science.gov (United States)

    Smolskaia, Irina; Masserot, Dominique; Lenoble, Jacqueline; Brogniez, Colette; de la Casinière, Alain

    2003-03-20

    A measurement campaign was carried out in February 1998 at Briançon Station, French Alps (44.9 degrees N, 6.65 degrees E, 1,310 m above sea level) in order to determine the UV effective snow albedo that was retrieved for both erythemal and UV-A irradiances from measurements and modeling enhancement factors. The results are presented for 15 cloudless days with very variable snow cover and a small snowfall in the middle of the campaign. Erythemal irradiance enhancement due to the surface albedo was found to decrease from approximately +15% to +5% with a jump to +22% after the snowfall, whereas UV-A irradiance enhancement decreased from 7% to 5% and increased to 15% after the snowfall. Thesevalues fit to effective surface albedos of 0.4, 0.1, and 0.5 for erythemal, and to effective albedos of 0.25, 0.1, and 0.4 for UV-A irradiances, respectively. An unexpected difference between the effective albedos retrieved in the two wavelength regions can be explained by the difference of the environment contribution.

  3. Development of a wind atlas for the Trentino region in the Alps

    Science.gov (United States)

    Giovannini, Lorenzo; Antonacci, Gianluca; Zardi, Dino; Laiti, Lavinia; Panziera, Luca

    2014-05-01

    Numerical simulations with the Weather Research and Forecasting (WRF) model over a climatological period are performed in view of the development of a wind atlas for Trentino, a region in the Italian Alps characterized by a very complex topography. Four nested grids are used, with an innermost domain resolution as high as 1.2 km. Model results are validated against a dataset composed of surface observations from routinely operated weather stations located at different altitudes, to test the ability of WRF to capture the main statistical characteristics of the wind field. Results show that the model is able to reproduce with a reasonable accuracy the main statistics and the distribution of wind velocity both on the valley floor and at higher heights. Moreover the model captures the typical behavior of thermally-driven circulations in valleys during clear sky days in the warm months, characterized by the development of a down-valley wind at night and an up-valley wind during the day. The ability of the model to reproduce the wind roses observed at the surface weather stations is also analyzed, highlighting that errors are larger in low wind speed conditions, when wind direction is more difficult to simulate, but also less significant. Moreover it is shown that large errors in the correct reproduction of the wind roses may be introduced by local-scale topographic features, which considerably affect the local wind field, but which cannot be adequately resolved at the adopted horizontal resolution.

  4. Alps to Apennines zircon roller coaster along the Adria microplate margin.

    Science.gov (United States)

    Jacobs, J; Paoli, G; Rocchi, S; Ksienzyk, A K; Sirevaag, H; Elburg, M A

    2018-02-09

    We have traced the particle path of high-pressure metasedimentary rocks on Elba Island, Northern Apennines, with the help of a U-Pb-Hf detrital zircon study. One quarter of the analysed zircons are surprisingly young, 41-30 Ma, with a main age peak at ca. 32 Ma, indicating an unexpected early Oligocene maximum deposition age. These Oligocene ages with negative εHf indicate a volcanic source region in the central-southern Alps. Though young by geological means, these zircons record an extraordinary geodynamic history. They originated in a volcanic arc, during the convergence/collision of the the Adria microplate with Europe from ca. 65 to 30 Ma. Thereafter, the Oligocene zircons travelled ca. 400 km southward along the Adria margin and the accretionary prism to present-day Tuscany, where they were subducted to depths of at least 40 km. Shortly thereafter, they were brought to the surface again in the wake of hinge roll back of the Apennine subduction zone and the resulting rapid extensional exhumation. Such a zircon roller coaster requires a microplate that has back-to-back subduction zones with opposing polarities on two sides.

  5. The geographical and environmental determinants of genetic diversity for four alpine conifers of the European Alps.

    Science.gov (United States)

    Mosca, E; Eckert, A J; Di Pierro, E A; Rocchini, D; La Porta, Nicola; Belletti, P; Neale, D B

    2012-11-01

    Climate is one of the most important drivers of local adaptation in forest tree species. Standing levels of genetic diversity and structure within and among natural populations of forest trees are determined by the interplay between climatic heterogeneity and the balance between selection and gene flow. To investigate this interplay, single nucleotide polymorphisms (SNPs) were genotyped in 24 to 37 populations from four subalpine conifers, Abies alba Mill., Larix decidua Mill., Pinus cembra L. and Pinus mugo Turra, across their natural ranges in the Italian Alps and Apennines. Patterns of population structure were apparent using a Bayesian clustering program, STRUCTURE, which identified three to five genetic groups per species. Geographical correlates with these patterns, however, were only apparent for P. cembra. Multivariate environmental variables [i.e. principal components (PCs)] were subsequently tested for association with SNPs using a Bayesian generalized linear mixed model. The majority of the SNPs, ranging from six in L. decidua to 18 in P. mugo, were associated with PC1, corresponding to winter precipitation and seasonal minimum temperature. In A. alba, four SNPs were associated with PC2, corresponding to the seasonal minimum temperature. Functional annotation of those genes with the orthologs in Arabidopsis revealed several genes involved in abiotic stress response. This study provides a detailed assessment of population structure and its association with environment and geography in four coniferous species in the Italian mountains. © 2012 Blackwell Publishing Ltd.

  6. Catchment features controlling nitrogen dynamics in running waters above the tree line (central Italian Alps

    Directory of Open Access Journals (Sweden)

    R. Balestrini

    2013-03-01

    Full Text Available The study of nitrogen cycling in mountain areas has a long tradition, as it was applied to better understand and describe ecosystem functioning, as well as to quantify long-distance effects of human activities on remote environments. Nonetheless, very few studies, especially in Europe, have considered catchment features controlling nitrogen dynamics above the tree line with focus on running waters. In this study, relationships between some water chemistry descriptors – including nitrogen species and dissolved organic carbon (DOC – and catchment characteristics were evaluated for a range of sites located above the tree line (1950–2650 m a.s.l. at Val Masino, in the central Italian Alps. Land cover categories as well as elevation and slope were assessed at each site. Water samples were collected during the 2007 and 2008 snow free periods, with a nearly monthly frequency. In contrast to dissolved organic nitrogen, nitrate concentrations in running waters showed a spatial pattern strictly connected to the fractional extension of tundra and talus in each basin. Exponential models significantly described the relationships between maximum NO3 and the fraction of vegetated soil cover (negative relation and talus (positive relation, explaining almost 90% of nitrate variation in running waters. Similarly to nitrate but with an opposite behavior, DOC was positively correlated with vegetated soil cover and negatively correlated with talus. Therefore, land cover can be considered one of the most important factors affecting water quality in high-elevation catchments with contrasting effects on N and C pools.

  7. Acidification and recovery at mountain lakes in Central Alps assessed by the MAGIC model

    Directory of Open Access Journals (Sweden)

    Michela ROGORA

    2004-02-01

    Full Text Available The dynamic model MAGIC was calibrated and applied to 84 lakes in Central Alps to predict the response of water chemistry to different scenarios of atmospheric deposition of S and N compounds. Selected lakes were representative of a wide range of chemical characteristics and of sensitivity to acidification. The most sensitive lakes have already shown in the latest years signs of recovery in terms of pH and ANC. The model well captured the main trends in lake chemical data. According to the model forecast, recovery at sensitive lakes will continue in the next decades under the hypothesis of a further decrease of acidic input from the atmosphere. Results clearly demonstrated the benefits of achieving the emission reductions in both S and N compounds agreed under the Gothenburg Protocol. Nevertheless, besides the achieved reduction of SO4 2- deposition from the peak levels of the 80s, also N deposition should be reduced in the near future to protect alpine lakes from further acidification. The condition of lake catchments with regard to N saturation will probably be the dominant factor driving recovery extent. Beside atmospheric deposition, other factors proved to be important in determining long-term changes in surface water chemistry. Climate warming in particular affects weathering processes in lake catchments and dynamics of the N cycle. Including other factors specific to the alpine area, such as dust deposition and climate change, may improve the fit of experimental data by the model and the reliability of model forecast.

  8. [Comparison of peritoneal dialysis and hemodialysis survival in Provence-Alpes-Côte d'Azur].

    Science.gov (United States)

    Habib, Aida; Durand, Anne-Claire; Brunet, Philippe; Delarozière, Jean-Christophe; Devictor, Bénédicte; Sambuc, Roland; Gentile, Stéphanie

    2016-07-01

    To analyze and compare survival of patients initially treated with peritoneal dialysis (PD) or hemodialysis (HD). We used data from the French REIN registry. We included all patients aged 18 years or more who started dialysis between 1st January 2004 and 12 December 2012 in Provence-Alpes-Côte d'Azur Region (PACA). These patients were followed up until 30 June 2014. Survival curves were generated using the Kaplan-Meier technique and tested using the log-rank test. Variables predictive of all-cause mortality were determined using Cox regression models. The propensity score was used. Survival was similar between initial dialysis modalities: PD and HD, even after adjusting for the propensity score. But, when we exclude the patients who had switched from one technique of dialysis to another, survival was better in HD patients. According to the multivariate analysis, advanced age and the lack of walking autonomy appear to be associated with an increase in mortality in dialysis patients. But, the presence of hypertension improve the survival in this cohort. The survival is similar between hemodialysis and peritoneal dialysis. Copyright © 2016 Association Société de néphrologie. Published by Elsevier SAS. All rights reserved.

  9. Timing and duration of European larch growing season along altitudinal gradients in the Swiss Alps.

    Science.gov (United States)

    Moser, Lea; Fonti, Patrick; Büntgen, Ulf; Esper, Jan; Luterbacher, Jürg; Franzen, Julia; Frank, David

    2010-02-01

    The 2007 European larch (Larix decidua Mill.) growing season was monitored along two elevational transects in the Lötschental valley in the Swiss Alps. Phenological observations and weekly microcore sampling of 28 larch trees were conducted between April and October 2007 at seven study sites regularly spaced from 1350 to 2150 m a.s.l. on northwest- and southeast-facing slopes. The developmental stages of nearly 75,000 individual cells assessed on 1200 thin sections were used to investigate the links between the trees' thermal regimes and growth phases including the beginning and ending of cell enlargement, wall thickening and maturation of the stem wood. Needles appeared approximately 3-4 weeks earlier than stem growth. The duration of ring formation lasted from mid-May to the end of October, with the length of the growing season decreasing along elevation from 137 to 101 days. The onset of the different growing seasons changed by 3-4 days per 100 m elevation; the ending of the growing season, however, appeared minimally related to altitude. If associated with the monitored altitudinal lapse rate of -0.5 degrees C per 100 m, these results translate into a lengthening of the growing season by approximately 7 days per degree Celsius. This study provides new data on the timing and duration of basic growth processes and contributes to quantification of the impacts of global warming on tree growth and productivity.

  10. Scenario analysis for biodiversity conservation: a social-ecological system approach in the Australian Alps.

    Science.gov (United States)

    Mitchell, Michael; Lockwood, Michael; Moore, Susan A; Clement, Sarah

    2015-03-01

    Current policy interventions are having limited success in addressing the ongoing decline in global biodiversity. In part, this is attributable to insufficient attention being paid to the social and governance processes that drive decisions and can undermine their implementation. Scenario planning that draws on social-ecological systems (SES) analysis provides a useful means to systematically explore and anticipate future uncertainties regarding the interaction between humans and biodiversity outcomes. However, the effective application of SES models has been limited by the insufficient attention given to governance influences. Understanding the influence governance attributes have on the future trajectory of SES is likely to assist choice of effective interventions, as well as needs and opportunities for governance reform. In a case study in the Australian Alps, we explore the potential of joint SES and scenario analyses to identify how governance influences landscape-scale biodiversity outcomes. Novel aspects of our application of these methods were the specification of the focal system's governance attributes according to requirements for adaptive capacity, and constraining scenarios according to the current governance settings while varying key social and biophysical drivers. This approach allowed us to identify how current governance arrangements influence landscape-scale biodiversity outcomes, and establishes a baseline from which the potential benefits of governance reform can be assessed. Copyright © 2014 Elsevier Ltd. All rights reserved.

  11. Structural complexity at and around the Triassic-Jurassic GSSP at Kuhjoch, Northern Calcareous Alps, Austria

    Science.gov (United States)

    Palotai, M.; Pálfy, J.; Sasvári, Á.

    2017-10-01

    One of the key requirements for a Global Stratotype Section and Point (GSSP) is the absence of tectonic disturbance. The GSSP for the Triassic-Jurassic system boundary was recently defined at Kuhjoch, Northern Calcareous Alps, Austria. New field observations in the area of the Triassic-Jurassic boundary GSSP site demonstrate that the overturned, tight, and almost upright Karwendel syncline was formed at semibrittle deformation conditions, confirmed by axial planar foliation. Tight to isoclinal folds at various scales were related to a tectonic transport to the north. Brittle faulting occurred before and after folding as confirmed by tilt tests (the rotation of structural data by the average bedding). Foliation is ubiquitous in the incompetent units, including the Kendlbach Formation at the GSSP. A reverse fault (inferred to be formed as a normal fault before folding) crosscuts the GSSP sections, results in the partial tectonic omission of the Schattwald Beds, and thus makes it impossible to measure a complete and continuous stratigraphic section across the whole Kendlbach Formation. Based on these observations, the Kuhjoch sections do not fulfil the specific requirement for a GSSP regarding the absence of tectonic disturbances near boundary level.

  12. Half-metallic ferromagnetic properties of Cr- and V-doped AlP semiconductors

    Energy Technology Data Exchange (ETDEWEB)

    Boutaleb, M., E-mail: miloudb20@gmail.com [Modelling and Simulation in Materials Science Laboratory, Physics Department, Djillali Liabes University of Sidi Bel-Abbes, 22000 Sidi Bel-Abbes (Algeria); Doumi, B. [Faculty of Sciences, Department of Physics, Dr. Tahar Moulay University of Saida, 20000 Saida (Algeria); Tadjer, A. [Modelling and Simulation in Materials Science Laboratory, Physics Department, Djillali Liabes University of Sidi Bel-Abbes, 22000 Sidi Bel-Abbes (Algeria); Sayede, A. [Unité de Catalyse et Chimie du Solide (UCCS), UMR CNRS 8181, Faculté des Sciences, Université d’Artois, Rue Jean Souvraz, SP 18, 62307 Lens (France)

    2016-01-01

    Using the full-potential linearized augmented plane-wave (FP-LAPW) calculations with generalized gradient approximation functional (GGA), we investigated the structural, electronic and magnetic properties of the family compounds AlP as ternary diluted semiconductors (DMS)s Al{sub 1−x}(TM=Cr,V){sub x}P with concentration of 0.25 and 0.125 in zinc blende phase (B3). The interaction of 3d orbital of transition metal with the 3p states of the four phosphorus atoms who occupy the summits of the tetrahedron resulting from SP3 hybridization, stabilize more the phenomena of magnetization by the effect of Zener's p–d exchange. The analyses of electronic and magnetic properties using the total and partial density of state and bands structure show that Al{sub 1−x}Cr{sub x}P and Al{sub 1−x}V{sub x}P are spin-polarized with a half-metallic band gap. We seem that these materials will be among the good candidates for spintronic applications. - Highlights: • Two doping concentrations of 0.25 and 0.125 with Al1-x(TM=Cr,V)xP are realizing. • Total and Partial -DOS calculations show the half-metallic ferromagnetic behavior. • Our compounds seem to be good materials for spintronic application.

  13. Hazard assessment investigations due to recent changes in Triftgletscher, Bernese Alps, Switzerland

    Directory of Open Access Journals (Sweden)

    P. Dalban Canassy

    2011-08-01

    Full Text Available The details and the consequences of the recent retreat of Triftgletscher (Gadmertal, Bernese Alps, Switzerland have been investigated. Geodetic volume changes indicate a strong decrease since 1929 while the position of the terminus remained practically unchanged until 1990. The role played by calving in the tongue retreat running from 2000 to 2006 is confirmed by means of a mass balance model including a calving criterion. Results show that without calving, it would have taken two years longer for the lake to form than has been observed. The consequences of the ensuing tongue destabilization are surveyed, first with an ice avalanche model and second with a hydraulic study of the potential impulse wave triggered by the impact of the falling ice mass in the lake. Results point out that ice avalanches with volumes greater that 1 × 106 m3 will flow into the lake and that in the worst scenario, a discharge of 400 m3 s−1 is expected to reach the endangered area in Gadmertal 11 min after the break-off. In order to detect surface motion precursors to such ice avalanches, a photographic monitoring system was installed. The results indicate seasonal variations with peak velocity in summer and no significant change during the other months. Spectacular velocity increases were not observed so far.

  14. Impact of droughts on water provision in managed alpine grasslands in two climatically different regions of the Alps.

    Science.gov (United States)

    Leitinger, Georg; Ruggenthaler, Romed; Hammerle, Albin; Lavorel, Sandra; Schirpke, Uta; Clement, Jean-Christophe; Lamarque, Pénélope; Obojes, Nikolaus; Tappeiner, Ulrike

    2015-12-01

    This study analyzes the impact of droughts, compared with average climatic conditions, on the supporting ecosystem service water provision in sub-watersheds in managed alpine grasslands in two climatically different regions of the Alps, Lautaret (French Alps) and Stubai (Austrian Alps). Soil moisture was modelled in the range of 0-0.3 m. At both sites, current patterns showed that the mean seasonal soil moisture was (1) near field capacity for grasslands with low management intensity and (2) below field capacity for grasslands with higher land-use intensity. Soil moisture was significantly reduced by drought at both sites, with lower reductions at the drier Lautaret site. At the sub-watershed scale, soil moisture spatial heterogeneity was reduced by drought. Under drought conditions, the evapotranspiration to precipitation ratios at Stubai was slightly higher than those at Lautaret, indicating a dominant 'water spending' strategy of plant communities. Regarding catchment water balance, deep seepage was reduced by drought at Stubai more strongly than at Lautaret. Hence, the observed 'water spending' strategy at Stubai might have negative consequences for downstream water users. Assessing the water provision service for alpine grasslands provided evidence that, under drought conditions, evapotranspiration was influenced not only by abiotic factors but also by the water-use strategy of established vegetation. These results highlight the importance of 'water-use' strategies in existing plant communities as predictors of the impacts of drought on water provision services and related ecosystem services at both the field and catchment scale.

  15. ALP-RISK, a smartphone app for collecting data on geomorphic phenomena at high altitude in the Mont Blanc region

    Science.gov (United States)

    Ravanel, Ludovic; Deline, Philip

    2014-05-01

    A network of observers (mountain guides, hut keepers and mountaineers) has been created from 2005 for the Mont Blanc massif in order to acquire data on rockfall in permafrost-affected rock walls. This network, fully operational since 2007, is based on observation sheets or oral communications and has documented nearly 350 events with volume between 100 and 45,000 m3. Their analysis confirmed and helped to better understand the role of the permafrost degradation as main triggering factor. To i) reinforce this network, ii) facilitate its observation work and iii) develop it as well in space (the whole Mont Blanc region, or eventually the whole western Alps) as in a thematic point of view (all glacial and periglacial brutal phenomena), the Alp-Risk app has been created in the framework of the Alcotra PrévRisk Mont-Blanc project. The latter (2011-13) has been developed to improve the prevention of individual and collective natural hazards around the Mont Blanc massif. The app was created for I-Phones and Androids in three languages (French, English and Italian) and allows, as intuitively and quickly as possible, transmitting data on natural hazards in high mountain (snow and ice avalanche, landslides and rockfalls, landslides, moraine destabilization, water pocket outburst flood, torrential flood, and others) to both practitioners (observations available directly on the app via an interface web), scientists, and possibly local managers. Alp-Risk thus constitutes a new step for participatory science in the Mont Blanc region.

  16. Responses to recent climate warming of Pinus sylvestris and Pinus cembra within their montane transition zone in the Swiss Alps

    Energy Technology Data Exchange (ETDEWEB)

    Haettenschwiler, S.; Koerner, C. [Basel Univ. (Switzerland). Botanisches Inst.

    1995-06-01

    Altitudinal and latitudinal distribution limits of trees are mainly controlled by temperature. Therefore climate warming is expected to induce upslope or poleward migrations. In the Swiss Central Alps, summers in the period 1982-1991 were on average 0.8 deg C warmer than those of the period 30 yr before. We investigated whether populations of conifers at the montane Pinus sylvestris-Pinus cembra ecocline exhibit demographic trends in response to that warming. We found no evidence for this. Young seedlings of Pinus sylvestris, the species which is expected to expand its range upward in a warmer climate, were virtually absent from all sites, whereas large fractions of Pinus cembra populations were observed in the seedlings and juvenile categories even below the present lower distribution limit of adult trees. This suggests that there are no major altitudinal shifts in response to the recent sequence of warmer summers. Germination and seedling survival trials with Pinus sylvestris suggest that temperature per se would not exclude this species even from establishing at the current treeline in the Swiss Central Alps. Similar results were found at the polar treeline. Phytotron tests of seedling survival showed much less drought resistance in Pinus sylvestris than in Pinus cembra which is in contrast to their phytogeographic distributions. Thus, the montane pine ecocline in the Swiss Central Alps seems to be stabilized by species interactions and may not be directly responsive to moderate climatic change, which needs to be taken into account in predictive attempts. 56 refs, 5 figs, 8 tabs

  17. ZnO nanoparticles augment ALT, AST, ALP and LDH expressions in C2C12 cells.

    Science.gov (United States)

    Pandurangan, Muthuraman; Kim, Doo Hwan

    2015-11-01

    The present study aimed to investigate the effect of ZnO nanoparticles on alanine transaminase (ALT), aspartate transaminase (AST), alkaline phosphatase (ALP) and lactate dehydrogenase (LDH) enzyme expressions in C2C12 cells. ZnO nanoparticles are widely used in the several cosmetic lotions and other biomedical products. Several studies report on ZnO nanoparticle mediated cytotoxicity. However, there are no reports on the effect of ZnO nanoparticles on ALT, AST, ALP and LDH enzyme expressions in C2C12 cells. A cytotoxicity assay was carried out to determine the effect of ZnO nanoparticles (1-5 mg/ml) on C2C12 cell viability at 48 and 72 h. ZnO nanoparticles increased ALT, AST, ALP and LDH enzyme mRNA expression and their activities in C2C12 cells. In conclusion, the present study showed that ZnO nanoparticles increased these enzyme activities and its mRNA expression in C2C12 cells in a dose-dependent manner.

  18. Ab-initio Calculations of Electronic Properties of AlP, GaP and InP

    Science.gov (United States)

    Malozovsky, Yuriy; Saliev, Azizjon; Franklin, Lashaunda; Ekuma, Chinedu; Zhao, Guang-Lin; Bagayoko, Diola

    2014-03-01

    We present results from ab-initio, self consistent local density approximation (LDA) calculations of electronic and related properties of zinc blende aluminum, gallium and indium phosphides (AlP, GaP & InP). We employed a local density approximation (LDA) potential and implemented the linear combination of atomic orbitals (LCAO) formalism. This implementation followed the Bagayoko, Zhao, and Williams (BZW) method, as enhanced by Ekuma and Franklin (BZW-EF). Our calculated, indirect band gap of 2.56 eV for AlP, and of 2.14 eV for GaP, from Γ to X, are in excellent agreement with experimental values. Our calculated direct band gap of 1.40 eV, at Γ -point for InP is also in excellent agreement with experimental value. We also report calculated electron and hole effective masses for AlP, GaP and InP and total (DOS) and partial (pDOS) densities of states. This research is funded in part by the National Science Foundation (NSF) and the Louisiana Board of Regents, through LASiGMA [Award Nos. EPS- 1003897, NSF (2010-15)-RII-SUBR] and NSF HRD-1002541, the US Department of Energy - National, Nuclear Security Administration (NNSA) (Award No. DE-NA0001861), LaSPACE, and LONI-SUBR.

  19. A first-principles study of the SCN− chemisorption on the surface of AlN, AlP, and BP nanotubes

    International Nuclear Information System (INIS)

    Soltani, Alireza; Taghartapeh, Mohammad Ramezani; Mighani, Hossein; Pahlevani, Amin Allah; Mashkoor, Reza

    2012-01-01

    Graphical abstract: Adsorption properties of SCN − on AlN, AlP, and BP nanotubes based on density functional theory. ▶ We demonstrate the most stable configurations (N-side) of SCN − on AlN, AlP, and BP nanotubes models. Highlights: ► The SCN − Adsorption on surface of AlN, AlP, and BP nanotubes were studied via density functional theory (DFT). ► The interaction of SCN − on the electronic properties and the NBO charge distribution of mentioned configurations are investigated. ► The studies suggest that the adsorption energies of SCN − on AlPNT is most notable in comparison with AlNNT and BPNT. - Abstract: We have performed first-principles calculations to explore the adsorption behavior of the SCN − on electronic properties of AlN, AlP, and BP nanotubes. The adsorption value of SCN − for the most stable formation on the AlPNT is about −318.16 kJ mol −1 , which is reason via the chemisorptions of SCN anion. The computed density of states (DOS) indicates that a notable orbital hybridization take place between SCN − and AlP nanotube in adsorption process. Finally, the AlP nanotube can be used to design as useful sensor for nanodevice applications.

  20. Climate and vegetation changes during the Lateglacial and early–middle Holocene at Lake Ledro (southern Alps, Italy

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    S. Joannin

    2013-04-01

    Full Text Available Adding to the on-going debate regarding vegetation recolonisation (more particularly the timing in Europe and climate change since the Lateglacial, this study investigates a long sediment core (LL081 from Lake Ledro (652 m a.s.l., southern Alps, Italy. Environmental changes were reconstructed using multiproxy analysis (pollen-based vegetation and climate reconstruction, lake levels, magnetic susceptibility and X-ray fluorescence (XRF measurements recorded climate and land-use changes during the Lateglacial and early–middle Holocene. The well-dated and high-resolution pollen record of Lake Ledro is compared with vegetation records from the southern and northern Alps to trace the history of tree species distribution. An altitude-dependent progressive time delay of the first continuous occurrence of Abies (fir and of the Larix (larch development has been observed since the Lateglacial in the southern Alps. This pattern suggests that the mid-altitude Lake Ledro area was not a refuge and that trees originated from lowlands or hilly areas (e.g. Euganean Hills in northern Italy. Preboreal oscillations (ca. 11 000 cal BP, Boreal oscillations (ca. 10 200, 9300 cal BP and the 8.2 kyr cold event suggest a centennial-scale climate forcing in the studied area. Picea (spruce expansion occurred preferentially around 10 200 and 8200 cal BP in the south-eastern Alps, and therefore reflects the long-lasting cumulative effects of successive boreal and the 8.2 kyr cold event. The extension of Abies is contemporaneous with the 8.2 kyr event, but its development in the southern Alps benefits from the wettest interval 8200–7300 cal BP evidenced in high lake levels, flood activity and pollen-based climate reconstructions. Since ca. 7500 cal BP, a weak signal of pollen-based anthropogenic activities suggest weak human impact. The period between ca. 5700 and ca. 4100 cal BP is considered as a transition period to colder and wetter conditions (particularly during

  1. Carbon dioxide generation and drawdown during active orogenesis of siliciclastic rocks in the Southern Alps, New Zealand

    Science.gov (United States)

    Menzies, Catriona D.; Wright, Sarah L.; Craw, Dave; James, Rachael H.; Alt, Jeffrey C.; Cox, Simon C.; Pitcairn, Iain K.; Teagle, Damon A. H.

    2018-01-01

    Collisional mountain building influences the global carbon cycle through release of CO2 liberated by metamorphic reactions and promoting mechanical erosion that in turn increases chemical weathering and drawdown of atmospheric CO2. The Southern Alps is a carbonate-poor, siliciclastic mountain belt associated with the active Australian Pacific plate boundary. On-going, rapid tectonic uplift, metamorphism and hydrothermal activity are mobilising carbon. Here we use carbon isotope measurements of hot spring fluids and gases, metamorphic host rocks, and carbonate veins to establish a metamorphic carbon budget. We identify three major sources for CO2 within the Southern Alps: (1) the oxidation of graphite; (2) consumption of calcite by metamorphic reactions at the greenschist-amphibolite facies boundary, and (3) the dissolution of groundmass and vein-hosted calcite. There is only a minor component of mantle CO2 arising on the Alpine Fault. Hot springs have molar HCO3-/Ca2+ ∼9, which is substantially higher than produced by the dissolution of calcite indicating that deeper metamorphic processes must dominate. The total CO2 flux to the near surface environment in the high uplift region of the Southern Alps is estimated to be ∼6.4 × 108 mol/yr. Approximately 87% of this CO2 is sourced from coupled graphite oxidation (25%) and disseminated calcite decarbonation (62%) reactions during prograde metamorphism. Dissolution of calcite and mantle-derived CO2 contribute ∼10% and ∼3% respectively. In carbonate-rich orogens CO2 production is dominated by metamorphic decarbonation of limestones. The CO2 flux to the atmosphere from degassing of hot springs in the Southern Alps is 1.9 to 3.2 × 108 mol/yr, which is 30-50% of the flux to the near surface environment. By contrast, the drawdown of CO2 through surficial chemical weathering ranges between 2.7 and 20 × 109 mol/yr, at least an order of magnitude greater than the CO2 flux to the atmosphere from this orogenic belt

  2. Analysis of topography and relief as a function of the tectonic - geomorphologic evolution of the Eastern Alps

    Science.gov (United States)

    Bungies, Nadin; Rosenberg, Claudio

    2014-05-01

    Alpine topography and relief vary regionally (Frisch et al., 1997), even on the scale of tens of kilometers. The causes of these differences are the aim of this work that is based on a geomorphological study of the eastern Alps. Earlier investigations on the topography of the Central Alps (Rosenberg & Garcia, 2013) show, by using 50 km, 75 km, and 100 km swath profiles, that the relief northward of the Insubric Line increases westward, whereas the relief southwards of the Insubric Line decreases eastward. This trend reflects collisional shortening trends recently observed in the Central Alps (Rosenberg & Kissling, 2013). In this work, we analyse the topography of the eastern Alps from the Brenner Area in the west to the Steiermark Area in the east, based on satellite images and digital terrain models, that cover an area of 36 000 km2 in the Austrian and Italian Alps. Based on these data, new GIS-aided datasets containing selected relief factors have been derived. These data are set in relationship to the eastward decrease in collisional shortening to test whether the latter trend has a geomorphic expression. In order to assess such a relationship north-south striking profiles, subparallel to the shortening direction and in addition to an E-W profile are investigated. It can be shown that the total relief of 3100 m (500-3600 m asl.) in the west of the working area is more pronounced than the total relief of 2300 m (700-3000 m asl) in the east of the working area. Furthermore slopes have higher amplitudes in the west when compared to the east. In the west approximately 65% of the slope profile show slopes larger than 50° while in the east approximately 40% of slopes are larger than 50° (based on 30 m topographic data). The evaluation of potential influencing factors will be achieved by conducting spatial and statistical data analysis and interpretation and is complemented by local studies investigating the evolution of relief for selected geologic units. Here

  3. Assessing water resources under climate change in high-altitude catchments: a methodology and an application in the Italian Alps

    Science.gov (United States)

    Aili, T.; Soncini, A.; Bianchi, A.; Diolaiuti, G.; D'Agata, C.; Bocchiola, D.

    2018-01-01

    Assessment of the future water resources in the Italian Alps under climate change is required, but the hydrological cycle of the high-altitude catchments therein is poorly studied and little understood. Hydrological monitoring and modeling in the Alps is difficult, given the lack of first hand, site specific data. Here, we present a method to model the hydrological cycle of poorly monitored high-altitude catchments in the Alps, and to project forward water resources availability under climate change. Our method builds on extensive experience recently and includes (i) gathering data of climate, of cryospheric variables, and of hydrological fluxes sparsely available; (ii) robust physically based glacio-hydrological modeling; and (iii) using glacio-hydrological projections from GCM models. We apply the method in the Mallero River, in the central (Retiche) Alps of Italy. The Mallero river covers 321 km2, with altitude between 310 and 4015 m a.s.l., and it has 27 km2 of ice cover. The glaciers included in the catchment underwent large mass loss recently, thus Mallero is largely paradigmatic of the present situation of Alpine rivers. We set up a spatially explicit glacio-hydrological model, describing the cryospheric evolution and the hydrology of the area during a control run CR, from 1981 to 2007. We then gather climate projections until 2100 from three Global Climate Models of the IPCC AR5 under RCP2.6, RCP4.5, and RCP8.5. We project forward flow statistics, flow components (rainfall, snow melt, ice melt), ice cover, and volume for two reference decades, namely 2045-2054 and 2090-2099. We foresee reduction of the ice bodies from - 62 to - 98% in volume (year 2100 vs year 1981), and subsequent large reduction of ice melt contribution to stream flows (from - 61 to - 88%, 2100 vs CR). Snow melt, now covering 47% of the stream flows yearly, would also be largely reduced (from - 19 to - 56%, 2100 vs CR). The stream flows will decrease on average at 2100 (from + 1 to - 25

  4. Constraints on the Miocene landscape evolution of the Eastern Alps from the Kalkspitze region, Niedere Tauern (Austria)

    Science.gov (United States)

    Dertnig, Florian; Stüwe, Kurt; Woodhead, Jon; Stuart, Finlay M.; Spötl, Christoph

    2017-12-01

    In order to unravel aspects of the Miocene landscape evolution of the eastern European Alps, we present geomorphic and isotopic data from the western Niedere Tauern region (Austria). The region is critical for such interpretations, because it is one of the few regions along the topographic axis of the Eastern Alps where the highest peaks (up to 2500 m a.s.l.) are dominated by limestone. As such, the region contains a record of Miocene landscape-forming events that survived the Pleistocene glaciations, not preserved elsewhere in the central Eastern Alps. This record includes karst caves, karstified planation surfaces and crystalline fluvial pebbles (Augenstein Formation) preserved on planation surfaces and in karst caves. Caves in the region occur in three distinct levels that correlate with well-known cave levels in the Northern Calcareous Alps, although they are somewhat higher in the Niedere Tauern. In part, these cave elevations also correlate with three planation surfaces and knickpoints of major streams draining the region, testifying their pre-glacial origin. We report details of a karst cave (Durchgangshöhle) from the highest cave level located at 2340 m a.s.l. In this cave, allochthonous fluvial gravels are present, overgrown by speleothems. One speleothem yielded an early middle Pleistocene U-Pb age (682 ± 17 ka). We regard this as a minimum age for the erosion of the fluvial cave deposits during Marine Isotope Stages 17 or 16. Carbon and oxygen isotope data of these speleothems imply a climate that is consistent with this interpretation. Cosmogenic 21Ne data of fluvial quartz clasts collected from the surface on plateaus of the Northern Calcareous Alps suggest minimum exposure durations of 115 and 262 ka. They probably reflect successive exposure since removal of the sediment cover of the Oligocene Augenstein Formation during the Pleistocene. While our geochronological data fail to record aspects of the earlier Miocene uplift history, they are

  5. Virtual tours as a new teaching tool in geoscience: an example from the Western Alps

    Science.gov (United States)

    Berger, Antoine; Champagnac, Jean-Daniel; Nomade, Jérome

    2013-04-01

    , these panorama can be linked together to travel from place to place. Last, but not least, the display of any type of information (video of the last year teachers' explanation, close up of a structure, graphic plot, text content, interpreted geological sections etc.) can be integrated in the virtual tour. From this, it is easy to build a full educational virtual tour that can include the information provided in the field book, and even become the field book itself. These virtual tours can be used with any device (laptop, tablet, smartphone...), hence have the potential become key players in field teaching. Finally, these virtual tours can help physically impaired students to complete their geological curriculum with the indispensable field experience they would not have had otherwise. Here we present an example of such a virtual tour build in 2012 across the European Alps during the 1st International Field Course organized by Grenoble University, ETH Zürich and Milano University. This virtual tour covers the Grimsel Pass Aar Massif Hercynian Basement (granite, shear zone and the underground NAGRA test site), the Zermatt area (two continents and two oceans packed together), the Aiguille du Midi incredible overview on most of the W-Alps, and the back limb of the Nappe de Morcles and its relation with the surrounding blocks. Link to the virtual tour: http://www.alpesphoto.com/temp/visites/Suisse/build/virtualtour.swf

  6. Observed long-term greening of alpine vegetation—a case study in the French Alps

    Science.gov (United States)

    Carlson, Bradley Z.; Corona, Monica C.; Dentant, Cédric; Bonet, Richard; Thuiller, Wilfried; Choler, Philippe

    2017-11-01

    We combined imagery from multiple sources (MODIS, Landsat-5, 7, 8) with land cover data to test for long-term (1984-2015) greening or browning trends of vegetation in a temperate alpine area, the Ecrins National Park, in the context of recent climate change and domestic grazing practices. We showed that over half (56%) of the Ecrins National Park displayed significant increases in peak normalized difference vegetation index (NDVImax) over the last 16 years (2000-2015). Importantly, the highest proportional increases in NDVImax occurred in rocky habitats at high elevations (> 2500 m a.s.l.). While spatial agreement in the direction of change in NDVImax as detected by MODIS and Landsat was high (76% overlap), correlations between log-response ratio values were of moderate strength (approx. 0.3). In the context of above treeline habitats, we found that proportional increases in NDVImax were higher between 1984 and 2000 than between 2000 and 2015, suggesting a slowing of greening dynamics during the recent decade. The timing of accelerated greening prior to 2000 coincided with a pronounced increase in the amount of snow-free growing degree-days that occurred during the 1980s and 1990s. In the case of grasslands and low-shrub habitats, we did not find evidence for a negative effect of grazing on greening trends, possibly due to the low grazing intensity typically found in the study area. We propose that the emergence of a longer and warmer growing season enabled high-elevation plant communities to produce more biomass, and also allowed for plant colonization of habitats previously characterized by long-lasting snow cover. Increasing plant productivity in an alpine context has potential implications for biodiversity trajectories and for ecosystem services in mountain landscapes. The presented evidence for long-term greening trends in a representative region of the European Alps provides the basis for further research on mechanisms of greening in alpine landscapes.

  7. Debris flow monitoring in the Acquabona watershed on the Dolomites (Italian Alps)

    Science.gov (United States)

    Berti, M.; Genevois, R.; LaHusen, R.; Simoni, A.; Tecca, P.R.

    2000-01-01

    In 1997 a field monitoring system was installed in Acquabona Creek in the Dolomites (Eastern Italian Alps) to observe the hydrologic conditions for debris flow occurrence and some dynamic properties of debris flow. The monitoring system consists of three remote stations: an upper one located at the head of a deeply-incised channel and two others located downstream. The system is equipped with sensors for measuring rainfall, pore pressures in the mobile channel bottom, ground vibrations, debris flow depth, total normal stress and fluid pore-pressure at the base of the flow. Two video cameras record events at the upper channel station and one video is installed at the lowermost station. During summer 1998, three debris flows (volumes from less than 1000 m3 up to 9000 m3) occurred at Acquabona. The following results were obtained from a preliminary analysis of the data: 1) All of the flows were triggered by rainfalls of less than 1 hour duration, with peak rainfall intensities ranging from 4.8 to 14.7 mm / 10 minute. 2) Debris flows initiated in several reaches of the channel, including the head of the talus slope. 3) The initial surges of the mature flows had a higher solid concentration and a lower velocity (up to 4 m/s) than succeeding, more dilute surges (more than 7 m/s). 4) Total normal stress and pore fluid pressures measured at the base of the flow (mean depth about 1.1 m) were similar (about 15 kPa), indicating a completely liquefied flow. 5) Peak flows entrained debris at a rate of about 6 m3/m of channel length and channel bed scouring was proportional to the local slope gradient and was still evident in the lower channel where the slope was 7??. ?? 2000 Elsevier Science Ltd. All rights reserved.

  8. Phytosociological and ecological study of springs in Trentino (south-eastern Alps, Italy

    Directory of Open Access Journals (Sweden)

    Alessandro PETRAGLIA

    2011-09-01

    Full Text Available A phytosociological survey of the crenic vegetation was made in Trentino (south-eastern Alps, combining the field method of the Braun-Blanquet approach with a numerical syntaxonomical analysis. A set of 139 phytosociological relevés, including vascular plants and bryophytes, were classified using cluster analysis. The vegetation types were assigned to 7 different phytosociological classes: Platyhypnidio-Fontinalietea antipyreticae, Montio-Cardaminetea, Adiantetea, Scheuchzerio-Caricetea nigrae, Molinio- Arrhenatheretea, Galio-Urticetea, Mulgedio-Aconitetea. The classes Platyhypnidio-Fontinalietea antipyreticae and Montio- Cardaminetea represent the core of crenic vegetation, including permanently or intermittently submerged plant communities, mostly made up of bryophytes, or non-submerged communities dominated by bryophytes or vascular plants. The other classes include chasmophytic bryophyte-rich communities and hygrophilous or tall herb communities lying around the periphery of the springs. 23 vegetation types were identified and, whenever possible, classified at the association level, or as phytocoena. The environmental parameters showed different ranges among vegetation types. A number of environmental variables were recorded during the vegetation survey, including altitude, shading, discharge, flow velocity, with exhaustive hydrochemical sampling. Conductivity, alkalinity and pH showed similar distribution patterns, clearly separating the vegetation types into two distinct groups, differing in the nature of the substratum. The altitudinal range was very broad and shading was also very variable. Nitrate and phosphate levels showed that the majority of vegetation types were irrigated by oligotrophic crenic waters. Finally, the bryophyte-dominated vegetation types belonging to the class Platyhypnidio-Fontinalietea antipyreticae occurred in springs with the highest discharge values and variation. Discriminant analysis confirmed that the

  9. Mapping the value of ecosystem services: A case study from the Austrian Alps

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    Alessandro Paletto

    2015-04-01

    Full Text Available Ecosystem services (ES are considered the conditions and processes through which natural ecosystems sustain and fulfil human life. In the decision making process related to the natural resources management, two key-aspects must be taken into account: the economic value of the benefits provided by ES (provisioning, regulating and cultural services and the spatial distribution of these benefits. The purpose of the paper is to develop a method aimed to capture the economic value of the benefits provided by ES, in order to support the decision makers in the natural resources management. ES are not homogeneous across landscapes nor in space. Consequently, gaining knowledge on the spatial distribution of the economic relevance of ES is a fundamental information to target management actions. This method was tested in a case study in the Austrian Alps (Leiblachtal area in Vorarlberg region, characterized by a high importance of forests and grasslands. The results show that the highest economic values could be achieved for the provisioning services with a range between 200 €/ha year and 1,400€/ha year. The regulating services have also important economic values, but strongly localized in specific areas (i.e. protective forests against natural hazards. The economic values of the cultural services are influenced by the preferences of tourists and varies between 5 €/ha year to 60 €/ha year. The method allowed us to reveal the spatial heterogeneity of provisioning, regulating and cultural ES, depending on the ecological characteristics of the site.

  10. CALCAREOUS NANNOFOSSIL BIOSTRATIGRAPHY OF UPPER CALLOVIAN-LOWER BERRIASIAN SUCCESSIONS FROM THE SOUTHERN ALPS, NORTH ITALY

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    CRISTINA EMANUELA CASELLATO

    2010-11-01

    Full Text Available Calcareous nannofossil biostratigraphy was investigated in uppermost Callovian-lower Berriasian sections from Southern Alps, previously detected through magnetostratigraphy, in order to achieve an integrated stratigraphic framework valid at low latitudes. Nannofossil investigations were carried out on smear slides and ultra-thin sections, revealing generally scarce to common abundances and poor-moderate preservation of nannofloras. An exhaustive taxonomic revision was performed to unambiguously separate forms which are transitional between two species and better delineate rapidly evolving groups. Four new species have been described: Zeugrhabdotus fluxus, Nannoconus puer, Nannoconus erbae, Hexalithus geometricus. Particular attention was paid to taxonomical aspects of primitive nannoconids, appearing and evolving across the early-late Tithonian transition and the Tithonian/Berriasian boundary intervals; the revision was also verified at DSDP Site 534A from Atlantic Ocean. Fourty-eight nannofossil bioevents were detected and the results help to increase potential stratigraphic resolution in this interval. Thirty-seven nannofossil bioevents in the upper Kimmeridgian-lower Berriasian interval have been directly correlated to magnetostratigraphy (CM22-CM17 revealing a systematically older stratigraphic occurrence of these taxa than previously reported. A revised and partly new Tethyan calcareous nannofossil zonation scheme is here proposed for the uppermost Callovian-lower Berriasian interval. It consists of seven bio-zones and eight subzones based on thirty-one bioevents, thirteen of them related to dissolution resistant taxa assuring highest reproducibility even in sections with high diagenetic overprint. The proposed biostratigraphic scheme gives higher resolution than previous zonations, especially for the Callovian-Kimmeridgian interval, where no biozonation was available for the Tethyan Realm. 

  11. Historical reconstruction of Plutonium contamination in the Swiss-Italian Alps

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    Gabrieli J.

    2013-04-01

    Full Text Available Plutonium is present in the environment as a consequence of atmospheric nuclear tests carried out in the 1960s, nuclear weapons production and releases by the nuclear industry over the past 50 years. Approximately 6 tons of 239Pu have been released into the environment as a result of 541 atmospheric weapon tests Nuclear Pu fallout has been studied in various environmental archives, such as sediments, soil and herbarium grass. Mid-latitude ice cores have been studied as well, on Mont Blanc, the Western Alps and on Belukha Glacier, Siberian Altai. We present a Pu record obtained by analyzing 52 discrete samples of an alpine firn/ice core from Colle Gnifetti (M. Rosa, 4450 m a.s.l., dating from 1945 to 1991. The 239Pu signal was recorded directly, without preliminary cleaning or preconcentration steps, using an high resolution inductively plasma mass spectrometer equipped with a desolvation system. The 239Pu profile reflects the three main periods of atmospheric nuclear weapons testing: the earliest peak lasted from 1954/55 to 1958 and was caused by the first testing period reaching a maximum in 1958. Despite a temporary halt of testing in 1959/60, the Pu concentration decreased only by half with respect to the 1958 peak due to long atmospheric residence times. In 1961/62 Pu concentrations rapidly increased reaching a maximum in 1963. After the signing of the “Limited Test Ban Treaty” between USA and USSR in 1964, Pu deposition decreased very sharply reaching a minimum in 1967. The third period (1967-1975 is characterized by irregular Pu concentrations with smaller peaks which might be related to the deposition of Saharan dust contaminated by the French nuclear tests of the 1960s.

  12. Using genetic algorithms to optimize the analogue method for precipitation prediction in the Swiss Alps

    Science.gov (United States)

    Horton, Pascal; Jaboyedoff, Michel; Obled, Charles

    2018-01-01

    Analogue methods provide a statistical precipitation prediction based on synoptic predictors supplied by general circulation models or numerical weather prediction models. The method samples a selection of days in the archives that are similar to the target day to be predicted, and consider their set of corresponding observed precipitation (the predictand) as the conditional distribution for the target day. The relationship between the predictors and predictands relies on some parameters that characterize how and where the similarity between two atmospheric situations is defined. This relationship is usually established by a semi-automatic sequential procedure that has strong limitations: (i) it cannot automatically choose the pressure levels and temporal windows (hour of the day) for a given meteorological variable, (ii) it cannot handle dependencies between parameters, and (iii) it cannot easily handle new degrees of freedom. In this work, a global optimization approach relying on genetic algorithms could optimize all parameters jointly and automatically. The global optimization was applied to some variants of the analogue method for the Rhône catchment in the Swiss Alps. The performance scores increased compared to reference methods, especially for days with high precipitation totals. The resulting parameters were found to be relevant and coherent between the different subregions of the catchment. Moreover, they were obtained automatically and objectively, which reduces the effort that needs to be invested in exploration attempts when adapting the method to a new region or for a new predictand. For example, it obviates the need to assess a large number of combinations of pressure levels and temporal windows of predictor variables that were manually selected beforehand. The optimization could also take into account parameter inter-dependencies. In addition, the approach allowed for new degrees of freedom, such as a possible weighting between pressure levels, and

  13. Environmental impact of cow milk production in the central Italian Alps using Life Cycle Assessment

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    Chiara A. Penati

    2013-12-01

    Full Text Available The aim of the study was to analyze environmental impact of cow milk production in an alpine area through a cradle-to-farm-gate Life Cycle Assessment and to identify farming strategies that can improve environmental sustainability without negatively affecting profitability. Data were collected from farmers in 28 dairy farms in an Italian alpine valley. The production of 1 kg of fat protein corrected milk (FPCM needed 3.18 m2 of land; land use on-farm was high because a large part of farm land consisted of pastures in the highland, used extensively during summer. Also the use of energy from non-renewable sources was high, 5.14 MJ kg FPCM-1 on average. Diesel for production and transportation of feed purchased off-farm was mainly used, especially concentrates which were entirely purchased. The average emission of greenhouse and acidification causing gases was 1.14 kg CO2-eq and 0.021 kg SO2-eq kg FPCM-1. Eutrophication was on average 0.077 kg of nitrate-eq kg FPCM-1. Farms with low producing cows had higher environmental impact per kg of milk and lower gross margin per cow compared to the others. Low stocking rate farms had the best results regarding acidification and eutrophication per kg FPCM. Farms with high feed self-sufficiency had significantly lower acidification potential than the others. Increasing milk yield per cow, by selection and feeding, and enhancing feed self-sufficiency, by higher forage production and quality and more exploitation of highland pastures, seem to be the best strategies to improve ecological performances of dairy farms in the Alps while maintaining their profitability.

  14. Impact of impurities and cryoconite on the optical properties of the Morteratsch Glacier (Swiss Alps

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    B. Di Mauro

    2017-11-01

    Full Text Available The amount of reflected energy by snow and ice plays a fundamental role in their melting processes. Different non-ice materials (carbonaceous particles, mineral dust (MD, microorganisms, algae, etc. can decrease the reflectance of snow and ice promoting the melt. The object of this paper is to assess the capability of field and satellite (EO-1 Hyperion hyperspectral data to characterize the impact of light-absorbing impurities (LAIs on the surface reflectance of ice and snow of the Vadret da Morteratsch, a large valley glacier in the Swiss Alps. The spatial distribution of both narrow-band and broad-band indices derived from Hyperion was analyzed in relation to ice and snow impurities. In situ and laboratory reflectance spectra were acquired to characterize the optical properties of ice and cryoconite samples. The concentrations of elemental carbon (EC, organic carbon (OC and levoglucosan were also determined to characterize the impurities found in cryoconite. Multi-wavelength absorbance spectra were measured to compare the optical properties of cryoconite samples and local moraine sediments. In situ reflectance spectra showed that the presence of impurities reduced ice reflectance in visible wavelengths by 80–90 %. Satellite data also showed the outcropping of dust during the melting season in the upper parts of the glacier, revealing that seasonal input of atmospheric dust can decrease the reflectance also in the accumulation zone of the glacier. The presence of EC and OC in cryoconite samples suggests a relevant role of carbonaceous and organic material in the darkening of the ablation zone. This darkening effect is added to that caused by fine debris from lateral moraines, which is assumed to represent a large fraction of cryoconite. Possible input of anthropogenic activity cannot be excluded and further research is needed to assess the role of human activities in the darkening process of glaciers observed in recent years.

  15. Ecological requirements of Abies alba in the French Alps derived from dendro-ecological analysis

    Energy Technology Data Exchange (ETDEWEB)

    Rolland, C.; Michalet, R.; Desplanque, C.; Petetin, A.; Aime, S. [Univ. Joseph Fourier, Grenoble (France). Centre de Biologie Alpine

    1999-06-01

    We used dendro-ecological techniques to investigate fundamental relationships between climate and growth of Abies alba (silver fir) in eastern France. Seven Abies forests in the Trieves region of the French Alps were chosen to represent a wide range of ecological conditions based on the results of previous forest vegetation surveys. In each forest, four trees were sampled in each of five different stands with two cores per tree. These 280 cores were studied using two separate dendro-ecological methods: the pointer years method (based on extreme growth events), and correlation functions between tree ring-widths and monthly climatic data. Data from 11 meteorological stations were combined to provide a regional analysis of precipitation and minimum and maximum temperatures. The two dendro-ecological methods appear to be complementary, as the first technique emphasizes common and low intensity linear correlations between ring-widths and climatic variations, and the second method emphasizes extreme and unusual climatic events such as exceptionally cold or dry years. Across all sites, drought in the previous year was consistently correlated with a low growth rate; however, other climatic variables varied substantially among sites. For example, drought in the current year reduced growth more in the low elevation sites than in the high elevation sites and severe winter frost reduced growth the most in the high altitude sites and the driest site. Moreover, certain growth responses are better correlated with the age of the stands, the canopy closure and the floristic composition of the community than the abiotic factors, emphasizing the value of dendro-ecological sampling based on phytosociological units 63 refs, 4 figs, 1 tab

  16. A study of the Würm glaciation focused on the Valais region (Alps

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    P. Becker

    2017-12-01

    Full Text Available During the Last Glacial Maximum (LGM, the glaciation in the European Alps reached maximum ice extent. We already simulated the steady states of the Alpine ice coverage for several climate drivers in Becker et al. (2016 and heighten in this article such studies for the Swiss Valais region. To this end, we employ the Parallel Ice Sheet Model (PISM, which combines the shallow ice approximation (SIA with basal sliding elements of the shallow shelf approximation (SSA, and subject this model to various external driving mechanisms. We further test the sensitivity of this kind of the ice coverage in the Valais region to a temporally constant climate and to monotonic ice sheet build-up from inception to steady state as well as to the Dye 3 temperature driving during the past 120 000 years. We also test differences in the precipitation patterns exerted to the northern and southern catchment areas of the Rhone and Toce rivers to possible transfluence changes in ice from the northern to the southern catchment areas and vice versa. Moreover, we study the effect of the ice deformability and estimate the removal up to 1000 m of sediment in the Rhone Valley and study the removal of rock hindering the flow through the valley cross section at the knee of Martigny. All these studies took place because of a discrepancy in the ice height prediction of the modelled ice sheet with its geomorphologically reconstructed counterpart with proxy data obtained by Bini et al. (2009 as well as a difference in ice height between the two of up to 800 m. Unfortunately, all the scenarios in the model do not sufficiently reduce this discrepancy in the height prediction and the geomorphological reconstruction. The model results have discovered an ice dynamical discrepancy with the land map in Bini et al. (2009.

  17. Recent, climate-driven river incision rate fluctuations in the Mercantour crystalline massif, southern French Alps

    Science.gov (United States)

    Petit, C.; Goren, L.; Rolland, Y.; Bourlès, D.; Braucher, R.; Saillard, M.; Cassol, D.

    2017-06-01

    We present a new geomorphological analysis of the Tinée River tributaries in the southern French Alps based on numerical inverse and forward modelling of their longitudinal profiles. We model their relative uplift history with respect to the main channel, hence the incision rate history of this channel. Inverse models show that all tributaries have consistent incision rate histories with alternating high and low values. A comparison with global temperature curves shows that these variations correlate with quaternary climate changes. We suggest that during warm periods, a wave of regressive erosion propagates in the Tinée River, while its tributaries deeply incise their substratum to catch up with the falling base-level. We also show that the post 140 ka history of this landscape evolution is dominated by fluvial incision. We then perform forward models of river incision and simulate the incision of the Tinée River system over a time span of 600 ka. This model allows us to extract time and space incision rate variations of the Tinée River. With a background of a few mm.yr-1, incision rate can increase up to more than 1 cm yr-1 during short periods of time due to climatic oscillations. This result is compatible with published cosmogenic nuclide based dating, which evidenced incision rates from 0.2 to 24 mm yr-1. The part of the channel located between 12 and 20 km downstream from the source has undergone several periods of rapid incision rates, which could explain the steep hillslopes and the triggering of a landslide ∼10 ka ago.

  18. Hepatitis E in liver transplant recipients in the Rhône-Alpes region in France.

    Science.gov (United States)

    Buffaz, C; Scholtes, C; Dron, A-G; Chevallier-Queyron, P; Ritter, J; André, P; Ramière, C

    2014-06-01

    In developed countries, hepatitis E virus (HEV) is considered an emerging pathogen, but prevalence seems highly variable according to previous European studies. As HEV can lead to chronic infections in immunosuppressed patients, it is thus essential to evaluate the prevalence and incidence of this infection. We determined retrospectively, in a cohort of 206 pediatric and adult liver transplant recipients from the Rhône-Alpes region in France, pre-transplant anti-HEV-IgG prevalence and incidence of HEV infections during post-transplant follow-up (HEV IgG and IgM ± HEV-RNA). Transplantations were carried out between 2005 and 2012 and mean post-transplant follow-up was 32.8 months. Global pre-transplant prevalence of anti-HEV IgG was 29%, increasing regularly with age from 7% for children under 15 to 49% for patients older than 60. From the 142 seronegative patients before transplant, 11 seroconversions (7.7%) were observed during follow-up (incidence of 2.83 cases per 100 person-years). HEV RNA-tested at transaminases peak or randomly-was detected in only one case of seroconversion. For at least 2 HEV-seropositive patients, who had negative RNAemia before transplantation, viral RNA was detected chronically during follow-up, suggesting reinfection with HEV. Acute infections were largely more frequent than chronic infections and were asymptomatic or misdiagnosed, suggesting that liver transplant patients may not be particularly prone to developing severe HEV hepatitis. In addition, the presence of IgG anti-HEV may not protect against re-infection. Serological testing, therefore, appears to be of limited interest for the diagnosis of HEV infections in liver transplant recipients.

  19. Environmental drivers of phototrophic biofilms in an Alpine show cave (SW-Italian Alps)

    International Nuclear Information System (INIS)

    Piano, E.; Bona, F.; Falasco, E.; La Morgia, V.; Badino, G.; Isaia, M.

    2015-01-01

    The proliferation of lampenflora is a major threat for the conservation of show caves, since phototrophic organisms cause physical, chemical and aesthetic damage to speleothems. In this paper we examine the environmental factors influencing the presence and the growth of the three main photosynthetic groups composing phototrophic biofilms in the Bossea show cave (SW-Italian Alps). The presence and the primary production of cyanobacteria, diatoms and green algae were detected with BenthoTorch®, an instrument for in situ measurement of chlorophyll a concentration that has never been used before in caves. By means of different techniques of regression analysis, we highlighted the response of the three photosynthetic groups to different environmental factors. Illuminance proved to be the main factor influencing positively both the probability of the presence and the productivity of the three groups. The presence of seeping water on the substrate and the distance from the cave entrance proved to play an important role in determining patterns of colonization. By means of GIS techniques, we provide thematic maps of the cave, providing a representation of pattern of the density of the three examined photosynthetic groups within different areas of the cave. The same approach may apply to other show caves, aiming at providing suggestions for the cave management (i.e. cleaning of the cave walls and positioning of artificial lights) and reduce impact caused by tourism. - Highlights: • We used a PAM fluorimeter on autotrophic biofilms in a show cave for the first time. • We modelled the environmental factors influencing phototrophic biofilms. • Illuminance, moisture and distance from the entrance proved to be significant. • We produced thematic maps illustrating our results. • We provide suggestions for cave management

  20. Environmental drivers of phototrophic biofilms in an Alpine show cave (SW-Italian Alps)

    Energy Technology Data Exchange (ETDEWEB)

    Piano, E., E-mail: elena.piano@unito.it [Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123 Turin (Italy); Bona, F.; Falasco, E. [Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123 Turin (Italy); La Morgia, V. [ISPRA, via Ca' Fornacetta, 9, 40064 Ozzano dell' Emilia (Italy); Badino, G. [Department of Physics, University of Turin, Via P. Giuria 1, 10125 Turin (Italy); Isaia, M. [Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123 Turin (Italy)

    2015-12-01

    The proliferation of lampenflora is a major threat for the conservation of show caves, since phototrophic organisms cause physical, chemical and aesthetic damage to speleothems. In this paper we examine the environmental factors influencing the presence and the growth of the three main photosynthetic groups composing phototrophic biofilms in the Bossea show cave (SW-Italian Alps). The presence and the primary production of cyanobacteria, diatoms and green algae were detected with BenthoTorch®, an instrument for in situ measurement of chlorophyll a concentration that has never been used before in caves. By means of different techniques of regression analysis, we highlighted the response of the three photosynthetic groups to different environmental factors. Illuminance proved to be the main factor influencing positively both the probability of the presence and the productivity of the three groups. The presence of seeping water on the substrate and the distance from the cave entrance proved to play an important role in determining patterns of colonization. By means of GIS techniques, we provide thematic maps of the cave, providing a representation of pattern of the density of the three examined photosynthetic groups within different areas of the cave. The same approach may apply to other show caves, aiming at providing suggestions for the cave management (i.e. cleaning of the cave walls and positioning of artificial lights) and reduce impact caused by tourism. - Highlights: • We used a PAM fluorimeter on autotrophic biofilms in a show cave for the first time. • We modelled the environmental factors influencing phototrophic biofilms. • Illuminance, moisture and distance from the entrance proved to be significant. • We produced thematic maps illustrating our results. • We provide suggestions for cave management.

  1. Interventionist and participatory approaches to flood risk mitigation decisions: two case studies in the Italian Alps

    Science.gov (United States)

    Bianchizza, C.; Del Bianco, D.; Pellizzoni, L.; Scolobig, A.

    2012-04-01

    Flood risk mitigation decisions pose key challenges not only from a technical but also from a social, economic and political viewpoint. There is an increasing demand for improving the quality of these processes by including different stakeholders - and especially by involving the local residents in the decision making process - and by guaranteeing the actual improvement of local social capacities during and after the decision making. In this paper we analyse two case studies of flood risk mitigation decisions, Malborghetto-Valbruna and Vipiteno-Sterzing, in the Italian Alps. In both of them, mitigation works have been completed or planned, yet following completely different approaches especially in terms of responses of residents and involvement of local authorities. In Malborghetto-Valbruna an 'interventionist' approach (i.e. leaning towards a top down/technocratic decision process) was used to make decisions after the flood event that affected the municipality in the year 2003. In Vipiteno-Sterzing, a 'participatory' approach (i.e. leaning towards a bottom-up/inclusive decision process) was applied: decisions about risk mitigation measures were made by submitting different projects to the local citizens and by involving them in the decision making process. The analysis of the two case studies presented in the paper is grounded on the results of two research projects. Structured and in-depth interviews, as well as questionnaire surveys were used to explore residents' and local authorities' orientations toward flood risk mitigation. Also a SWOT analysis (Strengths, Weaknesses, Opportunities and Threats) involving key stakeholders was used to better understand the characteristics of the communities and their perception of flood risk mitigation issues. The results highlight some key differences between interventionist and participatory approaches, together with some implications of their adoption in the local context. Strengths and weaknesses of the two approaches

  2. Congruencies between photoautotrophic groups in springs of the Italian Alps: implications for conservation strategies

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    Marco CANTONATI

    2011-09-01

    Full Text Available Even though a number of studies have demonstrated the importance of photoautotrophic organisms in spring habitats, investigations that consider several photoautotrophic taxonomic groups are lacking. Within the framework of a multidisciplinary project on springs of the south-eastern Alps, we studied algae, diatoms, lichens, and bryophytes and (1 compared the alpha, beta and gamma diversity, and the composition of the studied groups between carbonate and siliceous springs, (2 estimated the nonrandomness of species combinations within organismal groups, and (3 examined the congruence in species assemblage patterns across taxonomic groups. In 40 springs, 69 species of algae, 110 species of diatoms, 29 species of lichens, and 62 species of bryophytes were found. Diatoms, lichens and bryophytes had higher species-richness in siliceous springs, while other algae had higher richness in carbonate springs. For all taxonomic groups, carbonate and siliceous springs host different assemblages, indicating that both types of substrata contribute to the overall regional diversity of spring photoautotrophs. In individual springs, the photoautotroph groups are characterised by a similar proportion of species of their regional pool, and form relatively speciespoor communities with a high turnover of species among springs. This pattern has important implications for conservation, suggesting that the protection of single sites might not be effective, and that a biodiversity conservation plan for spring habitats should be developed at the regional level, and include a network of sites. Interestingly, the co-occurrence indices suggested that, in individual springs, stochastic processes might the most important mechanisms in the establishment of local assemblages. A weak cross-taxon congruency was found, suggesting that a single taxon surrogate will not adequately represent other photoautotrophic groups. Therefore, spring conservation plans for photoautotrophs should

  3. Daily precipitation variability in the Italian Alps over the last century

    Science.gov (United States)

    Brugnara, Y.; Brunetti, M.; Maugeri, M.; Nanni, T.; Simolo, C.

    2010-09-01

    Precipitation climatology in mountainous areas is characterized by high spatial variability, for instance total yearly mean values can change by hundreds of millimeters in the space of few kilometers . A dense network of rain gauges is then necessary to completely assess past changes in the hydrological cycle. Such networks are indeed operative on Italian territory since the 1920s, but the quality of this large amount of data needs to be carefully checked, especially for the presence of inhomogeneities. In this work we present an homogenized high-resolution dataset composed by more than 150 daily precipitation series spanning the last 90 years, located over an area centered on the Trentino-Alto Adige region (central-eastern part of Italian Alps). Missing data have been filled by using an advanced technique based on multi-linear regression and preserving the probability density function. On monthly and seasonal basis we analyzed trends of total precipitation, wet days and average intensity; for an easier understanding of geographical patterns we created a gridded dataset in terms of anomalies, with a spatial resolution of 0.1 degrees. For a more detailed analysis, daily precipitation amounts of each station have been classified into different intensity categories, based on the percentiles of the distribution, and the evolution of the number of events and of the total precipitation amount falling into each category have been studied. All the statistics have been analyzed for trend over the entire period spanned by the data and on sub-periods of variable length. Comparison with previous low-resolution studies on the same area underlines the importance of an high-resolution dataset in characterizing all aspects of climatic changes.

  4. Incision rate changes in the upper Var River catchment, southern French Alps: from observations to models.

    Science.gov (United States)

    Petit, Carole; Rolland, Yann; Goren, Liran; Bourlès, Didier; Braucher, Régis; Saillard, Marianne; Cassol, Davide

    2017-04-01

    Cosmic Ray Exposure (CRE) dating on river polished surfaces from gorges located in the Var River catchment (Southern French Alps) reveals high incision rate pulses (>10 mm.yr-1) related with climate changes, and in particular with glacial-interglacial transitions. In addition, they show that the onset of the last deglaciation in this area occurred shortly after the Last Glacial Maximum (LGM), i.e. 16-19 ka ago. Extrapolating these results to longer time scales suggests that the post 140 ka history of this landscape was dominated by fluvial incision. Inverse models based on the stream power law are then used to determine uplift rate variations in several small tributaries of this catchment with respect to the main channel. These inverse models show that all tributaries have consistent incision rate histories with alternating high and low values, and a comparison with global temperature curves shows that these variations significantly correlate with quaternary climate changes. We suggest that during warm periods, a wave of regressive erosion propagates in the main channel, while its tributaries deeply incise their substratum to catch up with the falling base-level. We then perform forward models of river incision and simulate the incision of the main channel system over a time span of 600 ka. This model allows us to extract time and space incision rate variations along the Tinée River channel (the largest tributary of the Var River). With a background of a few mm.yr-1, incision rate can increase up to more than 10 mm.yr-1 during short episodes, in agreement with CRE dating. The part of the channel located between 12 and 20 km downstream from the source has undergone several periods of rapid incision rates, which could explain the steep hillslopes and the triggering of a landslide 10 kyr ago.

  5. Assembly patterns of soil-dwelling lichens after glacier retreat in the European Alps.

    Science.gov (United States)

    Nascimbene, Juri; Mayrhofer, Helmut; Dainese, Matteo; Bilovitz, Peter Othmar

    2017-06-01

    To assess the spatial-temporal dynamics of primary succession following deglaciation in soil-dwelling lichen communities. European Alps (Austria, Switzerland and Italy). Five glacier forelands subjected to relevant glacier retreat during the last century were investigated. In each glacier foreland, three successional stages were selected at increasing distance from the glacier, corresponding to a gradient of time since deglaciation between 25 and 160 years. In each successional stage, soil-dwelling lichens were surveyed within five 1 × 1 m plots. In addition to a classical ecological framework, based on species richness and composition, we applied a functional approach to better elucidate community assembly mechanisms. A positive relationship was found between species richness and time since deglaciation indicating that richer lichen communities can be found at increasing terrain ageing. This pattern was associated with compositional shifts, suggesting that different community assemblages can be found along the successional stages. The analysis of β-diversity revealed a significant nested pattern of species assemblages along the gradient (i.e. earlier successional stages hosted a subset of the species already established in older successional stages), while the turnover component was less relevant. Considering functional groups, we found contrasting patterns in relation to time since deglaciation: the incidence of species with a cyanobacterial photobiont and those reproducing by spores decreased, while that of species reproducing by vegetative propagules increased. This study reveals that community assembly patterns of soil-dwelling lichens in alpine glacier forelands are ruled by mechanisms of directional species accumulation and trait selection that involve a trade-off between different functional strategies. Functional traits that reflect the dispersal and adaptation capability of the species underpin the colonization success of soil-dwelling lichens in

  6. Numerical simulations of the Ora del Garda wind in the Alps

    Science.gov (United States)

    Giovannini, Lorenzo; Laiti, Lavinia; Zardi, Dino

    2014-05-01

    High-resolution numerical simulations performed with the WRF model are analyzed to investigate the atmospheric boundary layer (ABL) structures associated with the development of a lake-breeze and valley-wind coupled system developing in the southeastern Italian Alps, the so-called "Ora del Garda" wind. Four nested grids are used, achieving a final horizontal resolution of 0.4 km. High-resolution orography and land use datasets are adopted for the domain initialization, while NCEP reanalysis provides initial and boundary conditions for the meteorological fields. Model results complement an existing dataset composed of a series of measurement flights, performed by means of an instrumented motorglider, and surface observations, which is also adopted to validate model results. The flights explored specific valley sections at key locations in the study area, namely over the lake's shore, at half valley and at the end of the valley where the breeze blows. Air pressure, temperature and relative humidity measurements were recorded. Model results display a good agreement with the experimental dataset. In particular, the surface diurnal cycles of radiation, wind and air temperature are satisfactorily reproduced, despite some discrepancies in the timing of thermally-driven circulation onset and offset. The typical structure of the valley ABL, characterized by shallow or even absent mixed layers surmounted by slightly stable layers extending up to the lateral crest level, is also qualitatively well reproduced in the simulated fields. Moreover, the simulations confirm characteristic local-scale features of the thermally-driven wind field suggested by the analysis of the airborne dataset as well as from previous observations in the area. For example, the model shows the development of a well-defined lake breeze front in the lake's shoreline area, as well as the formation of a hydraulic jump structure in the area where the Ora del Garda flows down into an adjacent valley from an

  7. A nested large-eddy simulation study of the Ora del Garda wind in the Alps

    Science.gov (United States)

    Giovannini, Lorenzo; Laiti, Lavinia; Zardi, Dino

    2015-04-01

    High-resolution numerical simulations performed with the Weather Research and Forecasting (WRF) model are analyzed to investigate the atmospheric boundary layer (ABL) structures associated with the development of a lake-breeze and valley-wind coupled system developing in the southeastern Italian Alps, the so-called "Ora del Garda" wind. Five domains were nested for the simulations: three mesoscale domains, forced by reanalysis data field, are used to drive the finest two domains, in which the large-eddy technique is used, achieving a final horizontal resolution of 80 m. Model results complement an existing dataset composed of a series of measurement flights and surface observations. The flights explored specific valley sections at key locations in the study area, namely over the lake's shore, at half valley and at the end of the valley where the breeze blows. Model results display a good agreement with the experimental dataset. In particular, the surface diurnal cycles of radiation, wind, air temperature and sensible heat flux are satisfactorily reproduced, despite some discrepancies in the timing of thermally-driven circulation onset and offset. The typical structure of the valley ABL, characterized by shallow or even absent mixed layers surmounted by slightly stable layers extending up to the lateral crest level, is also well reproduced in the simulated fields. Moreover, the simulations confirm characteristic local-scale features of the thermally-driven wind field suggested by the analysis of the airborne dataset as well as from previous observations in the area. For example, the model shows the development of inhomogeneities in the cross-valley thermal field, caused by the propagation of the lake breeze and by the different heating between the sidewalls of the valley, as well as the formation of a hydraulic jump in the area where the Ora del Garda flows down into an adjacent valley from an elevated saddle.

  8. Controls on Deep Seated Gravitational Slope Deformations in the European Alps

    Science.gov (United States)

    Crosta, Giovanni B.; Frattini, Paolo; Agliardi, Federico

    2013-04-01

    DSGSDs are very large, slow mass movements affecting entire high-relief valley slopes. The first orogen-scale inventory of such phenomena at has been recently presented for the European Alps (Crosta et al 2008, Agliardi et al 2012), and then further implemented. The inventory includes 1034 Deep Seated Gravitational Slope Deformations, widespread over the entire orogen and clustered along major valleys and in some specific sectors of the Alps. In this contribution we systematically explore lithological, structural and topographic controls on DSGSD distribution with the help of multivariate statistical techniques (Principal Component Analysis, Discriminant Analysis). Analysis units for statistical analysis were obtained by creating three square vector grids with 2.5 km, 5 km and 10 km grid cell size, respectively, covering the entire area (about 110,000 km2). For each grid cell, we calculated the density of DSGSD, and we assigned a value for each of the controlling variable considered in the analysis. From the NASA SRTM (Shuttle Radar Topography Mission) DEM we derived land surface parameters, such as relief, slope gradients, slope aspect, mean vertical distance from base level and ruggedness. The SRTM DEM was also used to extract the drainage density, with a threshold of 1 km2 and 10 km2. We also computer the stream power of the 1km2 river network Lithology was obtained by assembling different geological maps (1:200.000 map of Salzburg, 1:250.000 map of France, 1:500.000 maps of Switzerland and Austria, 1:1.000.000 map of Italy) and by reclassifying the geological units into 8 lithological classes (carbonate rocks, metapelites, sandstones and marls, paragneiss, ortogneiss, flysch-type rocks, granitoid/metabasite, Quaternary units, and volcanic rocks). To study the role of seismicity, we calculated the number of earthquakes (CPTI11 and USGS-NEIC database) within a distance dmax from the square cell, calculated adopting Keefer's (1984) equation, and the sum of Arias

  9. Attitudes of livestock farmers and sensitivity of livestock farming systems to drought conditions in the French Alps

    Directory of Open Access Journals (Sweden)

    Laurent Dobremez

    2011-01-01

    Full Text Available Livestock farming systems in the French Alps are particularly exposed to the predicted climate change and most of them have already experienced periods of drought since the beginning of the 2000s. Faced with this risk, livestock farmers have put in place a certain number of measures and envisage introducing others in the future. For the present study, surveys were conducted among livestock farmers to identify these measures and analyses were carried out to characterise the attitudes of livestock farmers to drought conditions and to evaluate changes in the sensitivity of their livestock farming systems. With the exception of those farms with extensive irrigated areas, all the farms are seeking solutions to deal with the risks arising from droughts. One solution is to purchase fodder to compensate for the decrease in the harvests that normally provide animal feed in the winter; the amounts purchased vary with the length of wintering required. For the grazing periods, the high mountain livestock breeders and the dairy systems of the Northern Alps rely above all on extending and over-sizing the pasture areas in relation to the needs of the herds. The livestock farms of the Southern Alps also rely on the diversity of vegetation areas and a certain flexibility in the practices used to adapt to conditions experienced during the year. A succession of dry years could result in more radical breakdowns in the livestock systems. It should also be remembered that climate change is only one of the factors influencing the types of changes taking place on farms.Les systèmes d'élevage des Alpes françaises sont fortement exposés au changement climatique annoncé et la plupart subissent déjà des épisodes de sécheresse depuis le début des années 2000. Face à ces aléas, les éleveurs ont mis en œuvre un certain nombre de leviers et envisagent d'en activer d'autres à l'avenir. Des enquêtes en exploitation ont permis d’identifier ces leviers. Leur

  10. Development and psychometric properties of the Swedish ALPS-Neo pain and stress assessment scale for newborn infants.

    Science.gov (United States)

    Lundqvist, Pia; Kleberg, Agneta; Edberg, Anna-Karin; Larsson, Björn A; Hellström-Westas, Lena; Norman, Elisabeth

    2014-08-01

    To validate and evaluate the psychometric properties of the ALPS-Neo, a new pain assessment scale created for the continuous evaluation of pain and stress in preterm and sick term infants. A unidimensional scale for continuous pain, Astrid Lindgren Children's Hospital Pain Scale (ALPS 1), was developed further to assess continuous pain and stress in infants treated in the neonatal intensive care unit (NICU). The pain scale includes observations of five behaviours. A manual was created, clarifying the scoring criteria. An internal and an external panel assessed face validity. Psychometric properties were evaluated in three different steps. Inter-rater reliability was estimated from video-based assessments (n = 625) using weighted kappa statistics (test I). Inter-rater reliability was further evaluated in test II (n = 125) and test III (n = 96) by real-time assessments using the intraclass correlation coefficient (ICC) and Cronbach's alpha. The final inter-rater reliability (test III) was assessed as good with ICC 0.91 for the total score and 0.62-0.81 for the five items. Cronbach's alpha showed 0.95 for the total score. ALPS-Neo is a new assessment tool for optimising the management of pain and stress in newborn infants in the NICU. It has proved easy to implement and user-friendly, permitting fast, reliable observations with high inter-rater reliability. ©2014 The Authors. Acta Paediatrica published by John Wiley & Sons Ltd on behalf of Foundation Acta Paediatrica.

  11. Statistical adaptation of ALADIN RCM outputs over the French Alps – application to future climate and snow cover

    Directory of Open Access Journals (Sweden)

    M. Rousselot

    2012-07-01

    Full Text Available In this study, snowpack scenarios are modelled across the French Alps using dynamically downscaled variables from the ALADIN Regional Climate Model (RCM for the control period (1961–1990 and three emission scenarios (SRES B1, A1B and A2 for the mid- and late 21st century (2021–2050 and 2071–2100. These variables are statistically adapted to the different elevations, aspects and slopes of the Alpine massifs. For this purpose, we use a simple analogue criterion with ERA40 series as well as an existing detailed climatology of the French Alps (Durand et al., 2009a that provides complete meteorological fields from the SAFRAN analysis model. The resulting scenarios of precipitation, temperature, wind, cloudiness, longwave and shortwave radiation, and humidity are used to run the physical snow model CROCUS and simulate snowpack evolution over the massifs studied. The seasonal and regional characteristics of the simulated climate and snow cover changes are explored, as is the influence of the scenarios on these changes. Preliminary results suggest that the snow water equivalent (SWE of the snowpack will decrease dramatically in the next century, especially in the Southern and Extreme Southern parts of the Alps. This decrease seems to result primarily from a general warming throughout the year, and possibly a deficit of precipitation in the autumn. The magnitude of the snow cover decline follows a marked altitudinal gradient, with the highest altitudes being less exposed to climate change. Scenario A2, with its high concentrations of greenhouse gases, results in a SWE reduction roughly twice as large as in the low-emission scenario B1 by the end of the century. This study needs to be completed using simulations from other RCMs, since a multi-model approach is essential for uncertainty analysis.

  12. The influence of magnesium on the activity of some enzymes (AST, ALT, ALP) and lead content in some tissues.

    Science.gov (United States)

    Todorovic, Tatjana; Vujanovic, Dragana

    2002-12-01

    Many authors in different studies have reported the antagonism between Mg and Pb. Our previous results suggested that oral Mg treatment have better effect on investigation biochemical parameters (protoporphyrins, aminolevulinic acid--ALA and d-aminolevulinic dehydratase ALA-D) used in evaluating Pb intoxication, then CaNa2EDTA, chelation agents, currently used in therapy of Pb intoxication. The toxic effect of Pb induced considerably modifies the activity of many other enzymes. In this work we have examined the influence of Mg (as alternative therapy of Pb poisoning) on enzymes activity--biochemical markers for general health conditions--aspartate aminotransferase (AST), alanine aminotransferase (ALT) and alkaline phosphatase (ALP) in condition of lead intoxication. Many studies showed disturbances of activity ALT, AST and ALP. The aim of this study was to confirm positive effects of Mg intake in condition of such intoxication at the level on activity of investigated enzymes. The experiment was performed on 45 male Wister rats, divided in three groups. I--control group; II--group treated daily for 30 days with 100 mg Pb, per kg body weight and next 60 without Pb treatment (spontaneous detoxication); III group--the same treatment as II group for the first 30 days, but next 60 days rats were treated orally with 40 mg Mg/kg body weight. Activity of AST and ALT was significant increased in condition of Pb poisoning, but ALP activity was significant reduced. Influence of excessive oral Mg treatment was positive: decrease of AST activity and ALT activity, which was probably in correlation with significant elimination of Pb from liver and increase of ALT enzyme activity at the normal level.

  13. Diversity of bacteria producing pigmented colonies in aerosol, snow and soil samples from remote glacial areas (Antarctica, Alps and Andes)

    Science.gov (United States)

    González-Toril, E.; Amils, R.; Delmas, R. J.; Petit, J.-R.; Komárek, J.; Elster, J.

    2008-04-01

    Four different communities and one culture of pigmented microbial assemblages were obtained by incubation in mineral medium of samples collected from high elevation snow in the Alps (Mt. Blanc area) and the Andes (Nevado Illimani summit, Bolivia), from Antarctic aerosol (French station Dumont d'Urville) and a maritime Antarctic soil (King George Island, South Shetlands, Uruguay Station Artigas). Molecular analysis of more than 200 16S rRNA gene sequences showed that all cultured cells belong to the Bacteria domain. The phylogenetic comparison with the currently available rDNA database allowed the identification of sequences belonging to Proteobacteria (Alpha-, Beta- and Gamma-proteobacteria), Actinobacteria and Bacteroidetes phyla. The Andes snow culture was the richest in bacterial diversity (eight microorganisms identified) and the maritime Antarctic soil the poorest (only one). Snow samples from Col du midi (Alps) and the Andes shared the highest number of identified microorganisms (Agrobacterium, Limnobacter, Aquiflexus and two uncultured Alphaproteobacteria clones). These two sampling sites also shared four sequences with the Antarctic aerosol sample (Limnobacter, Pseudonocardia and an uncultured Alphaproteobacteria clone). The only microorganism identified in the maritime Antarctica soil (Brevundimonas sp.) was also detected in the Antarctic aerosol. The two snow samples from the Alps only shared one common microorganism. Most of the identified microorganisms have been detected previously in cold environments (Dietzia kujamenisi, Pseudonocardia Antarctica, Hydrogenophaga palleronii and Brebundimonas sp.), marine sediments (Aquiflexus balticus, Pseudomonas pseudoalkaligenes, Pseudomonas sp. and one uncultured Alphaproteobacteria), and soils and rocks (Pseudonocardia sp., Agrobactrium sp., Limnobacter sp. and two uncultured Alphaproteobacetria clones). Air current dispersal is the best model to explain the presence of very specific microorganisms, like those

  14. Hydro-meteorological controls on the CO2 exchange variation in a mixed forest in the southern Italian Alps

    Science.gov (United States)

    Sottocornola, M.; Cavagna, M.; Zampedri, R.; Gianelle, D.

    2012-12-01

    We report about nine years (2003-2011) of eddy-covariance measurements of CO2 fluxes from the Lavarone mixed forest in the southern Italian Alps at 1350 m asl. This is a 110 years old humid forest, with an annual average air temperature of 7 °C and annual precipitation of about 1150 mm. The forest canopy peaks at around 32 m high and is dominated by fir (Abies alba), spruce (Picea abies) and some beech (Fagus sylvatica), with a LAI of about 9. A correlation coefficient analysis between the CO2 fluxes and hydro-meteorological variables measured at the same site indicates that the main drivers explaining the inter-annual variation in the CO2 fluxes are vapour pressure deficit (VPD) and precipitation, with higher CO2 uptake in more humid conditions. This result is partially surprising since Lavarone is a humid forest and in an ecosystem with high humidity, other drivers were expected to be more important than hydrological parameters. This suggests that the Lavarone forest has a very conservative strategy, closing the stomata as soon as humidity decreases just below an optimum threshold. The same analysis at a monthly time step indicates that during the growing season the Lavarone forest shows the same mechanisms as at the annual time step, stressing the role of VPD as an environmental driver, explaining both NEE and GEP. On the other hand, during the late winter and early spring, an higher CO2 sink is associated with higher air temperature and higher VPD. Among those studied, 2009 is an anomalous year, having experienced very high air temperatures and high and frequent precipitation, that triggered the highest GEP and highest net CO2 sink (lowest NEE). The climate change scenarios for the Alps agree about an increase of temperatures, but disagree on the future precipitation. If together with higher temperatures, the Alps will experience higher precipitation as well, the Lavarone and similar forest will likely increase their CO2 uptake.

  15. Holocene flood frequency across the Central Alps - solar forcing and evidence for variations in North Atlantic atmospheric circulation

    Science.gov (United States)

    Wirth, Stefanie B.; Glur, Lukas; Gilli, Adrian; Anselmetti, Flavio S.

    2013-11-01

    The frequency of large-scale heavy precipitation events in the European Alps is expected to undergo substantial changes with current climate change. Hence, knowledge about the past natural variability of floods caused by heavy precipitation constitutes important input for climate projections. We present a comprehensive Holocene (10,000 years) reconstruction of the flood frequency in the Central European Alps combining 15 lacustrine sediment records. These records provide an extensive catalog of flood deposits, which were generated by flood-induced underflows delivering terrestrial material to the lake floors. The multi-archive approach allows suppressing local weather patterns, such as thunderstorms, from the obtained climate signal. We reconstructed mainly late spring to fall events since ice cover and precipitation in form of snow in winter at high-altitude study sites do inhibit the generation of flood layers. We found that flood frequency was higher during cool periods, coinciding with lows in solar activity. In addition, flood occurrence shows periodicities that are also observed in reconstructions of solar activity from 14C and 10Be records (2500-3000, 900-1200, as well as of about 710, 500, 350, 208 (Suess cycle), 150, 104 and 87 (Gleissberg cycle) years). As atmospheric mechanism, we propose an expansion/shrinking of the Hadley cell with increasing/decreasing air temperature, causing dry/wet conditions in Central Europe during phases of high/low solar activity. Furthermore, differences between the flood patterns from the Northern Alps and the Southern Alps indicate changes in North Atlantic circulation. Enhanced flood occurrence in the South compared to the North suggests a pronounced southward position of the Westerlies and/or blocking over the northern North Atlantic, hence resembling a negative NAO state (most distinct from 4.2 to 2.4 kyr BP and during the Little Ice Age). South-Alpine flood activity therefore provides a qualitative record of variations

  16. Evidence for enhanced debris-flow activity in the Northern Calcareous Alps since the 1980s (Plansee, Austria)

    Science.gov (United States)

    Dietrich, A.; Krautblatter, M.

    2017-06-01

    Debris flows are among the most important natural hazards. The Northern Calcareous Alps with their susceptible lithology are especially affected by a double digit number of major hazard events per year. It is hypothesised that debris-flow intensity has increased significantly in the last decades in the Northern Calcareous Alps coincident to increased rainstorm frequencies, but yet there is only limited evidence. The Plansee catchment exposes extreme debris-flow activity due to the intensely jointed Upper Triassic Hauptdolomit lithology, being responsible for most of the debris-flow activity in the Northern Calcareous Alps. The debris flows feed into a closed sediment system, the Plansee Lake, where Holocene/Lateglacial sedimentation rates, rates since the late 1940s and recent rates can be inferred accurately. Using aerial photos and field mapping, the temporal and spatial development of eight active debris-flow fans is reconstructed in six time intervals from 1947, 1952, 1971, 1979, 1987, 2000 and 2010 and mean annual debris-flow volumes are calculated. These are compared with mean Holocene/Lateglacial debris-flow volumes derived from the most prominent cone whose contact with the underlying till is revealed by electrical resistivity tomography (ERT). Debris-flow activity there increased by a factor of 10 from 1947-1952 (0.23 ± 0.07 · 103 m3/yr) to 1987-2000 (2.41 ± 0.66 · 103 m3/yr). Mean post-1980 rates from all eight fans exceed pre-1980 rates by a factor of more than three coinciding with enhanced rainstorm activity recorded at meteorological stations in the Northern Calcareous Alps. The frequency of rain storms (def. 35 mm/d) has increased in the study area on average by 10% per decade and has nearly doubled since 1921. Recent debris-flow activity is also 2-3 times higher than mean Holocene/Lateglacial rates. The strong correlation between the non-vegetated catchment area and the annual debris-flow volume might indicate a decadal positive feedback between

  17. Assessment of the energetic potential of methanization sources in Provence-Alpes-Cote d'Azur

    International Nuclear Information System (INIS)

    2015-03-01

    This publication reports a study of assessment of the potential production of methanization sources in the Provence-Alpes-Cote d'Azur region. Different organic materials have been considered: agri-industrial wastes, agricultural wastes, and wastes from local communities. In order to perform the assessment, various technical, financial, social and environmental parameters and criteria have been taken into account. After a synthetic presentation of results, and a description of the adopted methodology, the document reports the detailed assessments for the three addressed sources with distinctions of the different origins for each of them

  18. Rapid Late Miocene Exhumation in the Central Alps, Constrained by (U-Th)/He and Fission Track Thermochronology

    Science.gov (United States)

    Aramowicz, A.; Cosca, M.; Stockli, D.; Farley, K.; Seward, D.

    2007-12-01

    Zircon and apatite (U-Th)/He thermochronological data together with apatite fission track analyses are used to explore uplift and exhumation of the western part of the Aar massif in the central Swiss Alps. A total of 27 samples were collected from the surface and underground, from the world's deepest tunnel (Loetschberg NEAT), with an overall elevation difference of almost 2500 m. Zircon (U-Th)/He ages range from 5.5 to 7.6 Ma, apatite fission track ages range from 5.7 to 6.5 Ma and apatite (U-Th)/He ages range from 3 to 5.5 Ma. All zircon age-elevation profiles from three traverses, show distinct brakes in slope that mark a drastic, 10-fold acceleration of exhumation at 6 ± 0.5 Ma ago (from 0.3 km/Ma to 3 km/Ma). The trend of fast exhumation appears to be maintained in the apatite fission track data while apatite (U-Th)/He ages suggest a return to moderate, apparent exhumation rates of 0.5 km/Ma. We propose that the accelerated exhumation may be linked to the Messinian desiccation of the Mediterranean. During that event, Mediterranean sea level dropped locally by as much as 3 km which accelerated erosion in the Alps. Consequently, the erosion in the Alps must have increased. If wedge mechanics are considered, the increased erosional flux reduced the active width of the orogen and, during latest convergence, deformation focused in the internal parts of the Alps, i.e. Aar massif. This interpretation implies a strong and prompt feedback between external forcing and tectonic response of the orogen. The slower exhumation rate apparent from the apatite (U-Th)/He data may reflect a decline in deformation. Alternatively, due to its low closure temperature, this system is prone to resetting by heat advected through hydrothermal circulation. This scenario needs further investigation but abundant hot-water (ca. 50 °C) discharge in the sampled tunnel is not uncommon.

  19. Developing a visual moraine classification scheme to support investigations into the Holocene glacier chronology of the Southern Alps, New Zealand

    Science.gov (United States)

    Kaufung, Eva; Winkler, Stefan

    2014-05-01

    The Southern Alps of New Zealand have provided one of only a few suitable study sites for investigating Holocene glacier chronologies in the mid-latitudinal Southern Hemisphere. Although a considerable number of studies have been conducted during the past few decades, these generally focus on a very limited number of glacier forelands. Additionally, those glaciers studied have often been selected because of their accessibility rather than their representativeness for the whole region. A common drawback of many regional studies is the lack of attention to glacial geomorphology and the mode of moraine formation with the dating of such landforms in chronological context. With the Southern Alps characterized by very dynamic geomorphological process-systems and a high seismic activity, this seems unfortunate as it causes a relatively high potential "geomorphological uncertainty" with any published glacier chronology and its subsequent palaeoclimatological interpretation. Future investigations into the Holocene glacier chronology in the Southern Alps need to address those existing shortcomings and, consequently, should achieve a representative spatial distribution of study sites in order to overcome the current strong data bias towards few, albeit relatively well-studied glacier forelands. The specific regional geomorphological environment of the Southern Alps requires, furthermore, a thorough assessment of any moraine selected for the subsequent dating in consideration of its "reliability" if it is considered as evidence of specific former glacier variations. With more than 3000 potential glacier forelands in the entire mountain range, careful selection of future targets for successful chronological field work is essential. We present the preliminary results of an ongoing, time-efficient study to apply different remote sensing sources (aerial photography, Google Earth, satellite images) to evaluate the potential of certain glacier forelands for detailed ground

  20. Petrography and P-T estimates of burial stage of eclogites from Kreuzeck Massif, Eastern Alps, Austria

    International Nuclear Information System (INIS)

    Michalek, M.

    2010-01-01

    In general, eclogites and eclogites facies rocks are interpreted as oceanic and/or continental crustal material buried to mantle depths. These rocks provide important information on the early stage of orogenic processes. Some cases allow us to determine according to the textures and microfabrics establish the eclogitic and post-eclogitic deformation history from burial by subduction to subsequent exhumation. The purpose of this contribution is petrography and P-T estimates of the burial stage of eclogites from the Polinik structural complex in Kreuzeck massif, Eastern Alps in Austria.

  1. Serum LDH and ALP isozyme activities in mice bearing solid Ehrlich carcinoma and/or treated with the maximum tolerated dose (MTD) of aloin.

    Science.gov (United States)

    Fahim, F A; Esmat, A Y; Mady, E A; Amin, M A

    1997-11-01

    Determination of total LDH and ALP activities and their isozyme patterns in the sera of normal and tumour-bearing animals treated with aloin, a natural anthraquinone with potential antitumour activity, was carried out at 3, 6 and 9 weeks of treatment. Treatment of normal mice with the MTD of aloin (50 mg/Kg b.w.) showed non-significant changes in serum total LDH and ALP activities along with their isozymes throughout the experimental periods. In untreated tumour-bearing animals, serum LDH activity and its isozymes: LDH1-LDH5 showed highly significant increases (192, 32.4, 25.2, 24.7, 29.2 and 30.6%, respectively) after 3 weeks. Highly significant inhibition was recorded in serum total ALP activity and its intestinal and bone isozymes (64, 100 and 56%, respectively), while liver ALP isozyme was increased by 82.3%. Treatment of tumour-bearing mice with the MTD of aloin manifested a significant gradual improvement in both enzyme activities and their isozymes, which were normalized at the end of the experiment (9 weeks), with the exception of intestinal ALP isozyme. All results were reported in comparison to the normal control group.

  2. Ritual Continuity and “Failed Rituals” in a Winter Masquerade in the Italian Alps

    Directory of Open Access Journals (Sweden)

    Lia Zola

    2011-08-01

    Full Text Available Alpine winter masquerades, also known as carnival masquerades, may be regarded as one of the most complex phenomena within the field of study of cultural anthropology and folklore. In the Italian alpine chain some of them have been brought to a new life two decades ago after a long period of decline; since then, alpine winter masquerades have been the focus of a great interest by cultural anthropologists, theatre performers and other intellectuals. In some cases bringing a winter masquerade to new life has proved to be successful; in others, after a first, “reborn” performance, some celebrations abruptly stopped. My paper aims to explore issues of ritual continuity and ritual failure through a specific case-study, that of the carnival masquerade in Salbertrand, an alpine settlement of 485 inhabitants in the upper part of the Val di Susa, in the Italian western alpine chain.Les mascarades alpines d'hiver, aussi connues comme mascarades de carnaval, peuvent être considérées comme l’un des phénomènes les plus complexes dans le champ d'étude d'anthropologie culturelle et du folklore. Dans la chaîne alpine italienne, certains d'entre eux ont été amenés à une nouvelle vie il y a deux décennies, après une longue période de déclin. Dès lors, les mascarades alpines d'hiver ont été sujet d'intérêt majeur pour les anthropologues culturels, les acteurs de théâtre et d'autres intellectuels. Dans certains cas, réactiver une mascarade d'hiver s'est soldé par une réussite ; dans d'autres, après une première manifestation "renaissante" quelques célébrations se sont brusquement arrêtées. Mon article aspire à explorer les phénomènes de continuité et d'échec rituel à travres une étude de cas spécifique, celui de la mascarade de carnaval de Salbertrand, une localité alpine de 485 habitants dans la partie supérieure de Val De Suse, dans les Alpes occidentales italiennes.

  3. AlpArray - technical strategies for large-scale European co-operation in broadband seismology

    Science.gov (United States)

    Brisbourne, A.; Clinton, J.; Hetenyi, G.; Pequegnat, C.; Wilde-Piorko, M.; Villasenor, A.; Comelli, P.; AlpArray Working Group

    2012-04-01

    AlpArray is a new initiative to study the greater Alpine area with a large-scale broadband seismological network. The interested parties (currently 32 institutes in 12 countries) plan to combine their existing infrastructures into an all-out transnational effort that includes data acquisition, processing, imaging and interpretation. The experiment will encompass the greater Alpine area, from the Black Forest in the north to the Northern Apennines in the south and from the Pannonian Basin in the east to the French Massif Central in the west. We aim to cover this region with high-quality broadband seismometers by combining the ~400 existing permanent stations with an additional 400+ instruments from mobile pools. In this way, we plan to achieve homogeneous and high resolution coverage while also deploying densely spaced stations along swaths across key parts of the Alpine chain. These efforts on land will be combined with deployments of ocean bottom seismometers in the Mediterranean Sea. Significant progress has already been made in outlining the scientific goals and funding strategy. A brief overview of these aspects of the initiative will be presented here. However, we will concentrate on the technical aspects: How efficient large-scale integration of existing infrastructures can be achieved. Existing permanent station coverage within the greater Alpine area has been collated and assessed for data availability, allowing strategies to be developed for network densification to ensure a robust backbone network: An anticipated deployment strategy has been drawn up to optimise array coverage and data quality. The augmented backbone network will be supplemented by more densely spaced temporary arrays targeting more specific scientific questions. For these temporary arrays, a strategy document has been produced to outline standards for station installation, data acquisition, processing, archival and dissemination. All these operations are of course vital. However, data

  4. Hydraulic structure of a fault zone at seismogenic depths (Gole Larghe Fault Zone, Italian Southern Alps)

    Science.gov (United States)

    Bistacchi, Andrea; Mittempergher, Silvia; Di Toro, Giulio; Smith, Steve; Garofalo, Paolo; Vho, Alice

    2016-04-01

    The Gole Larghe Fault Zone (GLFZ, Italian Southern Alps) was exhumed from c. 8 km depth, where it was characterized by seismic activity (pseudotachylytes), but also by hydrous fluid flow (alteration halos and precipitation of hydrothermal minerals in veins and cataclasites). Thanks to glacier-polished outcrops exposing the fault zone over a continuous area > 1 km2, the fault zone architecture has been quantitatively described with an unprecedented detail (Bistacchi 2011, PAGEOPH; Smith 2013, JSG; Mittempergher 2016, this meeting), providing a rich dataset to generate 3D Discrete Fracture Network (DFN) models and simulate the fault zone hydraulic properties. Based on field and microstructural evidence, we infer that the opening and closing of fractures resulted in a toggle-switch mechanism for fluid flow during the seismic cycle: higher permeability was obtained in the syn- to early post-seismic period, when the largest number of fractures was (re)opened by off-fault deformation, then permeability dropped due to hydrothermal mineral precipitation and fracture sealing. Since the fracture network that we observe now in the field is the result of the cumulative deformation history of the fault zone, which probably includes thousands of earthquakes, a fundamental parameter that cannot be directly evaluated in the field is the fraction of fractures-faults that were open immediately after a single earthquake. Postseismic permeability has been evaluated in a few cases in the world thanks to seismological evidences of fluid migration along active fault systems. Therefore, we were able to develop a parametric hydraulic model of the GLFZ and calibrate it, varying the fraction of faults/fractures that were open in the postseismic period, to obtain on one side realistic fluid flow and permeability values, and on the other side a flow pattern consistent with the observed alteration/mineralization pattern. The fraction of open fractures is very close to the percolation threshold

  5. Coda-derived source spectra, moment magnitudes and energy-moment scaling in the western Alps

    Science.gov (United States)

    Morasca, P.; Mayeda, K.; Malagnini, L.; Walter, William R.

    2005-01-01

    A stable estimate of the earthquake source spectra in the western Alps is obtained using an empirical method based on coda envelope amplitude measurements described by Mayeda et al. for events ranging between MW~ 1.0 and ~5.0. Path corrections for consecutive narrow frequency bands ranging between 0.3 and 25.0 Hz were included using a simple 1-D model for five three-component stations of the Regional Seismic network of Northwestern Italy (RSNI). The 1-D assumption performs well, even though the region is characterized by a complex structural setting involving strong lateral variations in the Moho depth. For frequencies less than 1.0 Hz, we tied our dimensionless, distance-corrected coda amplitudes to an absolute scale in units of dyne cm by using independent moment magnitudes from long-period waveform modelling for three moderate magnitude events in the region. For the higher frequencies, we used small events as empirical Green's functions, with corner frequencies above 25.0 Hz. For each station, the procedure yields frequency-dependent corrections that account for site effects, including those related to fmax, as well as to S-to-coda transfer function effects. After the calibration was completed, the corrections were applied to the entire data set composed of 957 events. Our findings using the coda-derived source spectra are summarized as follows: (i) we derived stable estimates of seismic moment, M0, (and hence MW) as well as radiated S-wave energy, (ES), from waveforms recorded by as few as one station, for events that were too small to be waveform modelled (i.e. events less than MW~ 3.5); (ii) the source spectra were used to derive an equivalent local magnitude, ML(coda), that is in excellent agreement with the network averaged values using direct S waves; (iii) scaled energy, , where ER, the radiated seismic energy, is comparable to results from other tectonically active regions (e.g. western USA, Japan) and supports the idea that there is a fundamental

  6. Continuous monitoring of a mountain snowpack in the Austrian Alps by above-ground neutron sensing

    Science.gov (United States)

    Schattan, Paul; Baroni, Gabriele; Oswald, Sascha E.; Schöber, Johannes; Fey, Christine; Francke, Till; Huttenlau, Matthias; Achleitner, Stefan

    2017-04-01

    In alpine catchments the knowledge of the spatially and temporally heterogeneous dynamics of snow accumulation and depletion is crucial for modelling and managing water resources. While snow covered area can be retrieved operationally from remote sensing data, continuous measurements of other snow state variables like snow depth (SD) or snow water equivalent (SWE) remain challenging. Existing methods of retrieving both variables in alpine terrain face severe issues like a lack of spatial representativeness, labour-intensity or discontinuity in time. Recently, promising new measurement techniques combining a larger support with low maintenance cost like above-ground gamma-ray scintillators, GPS interferometric reflectometry or above-ground cosmic-ray neutron sensors (CRNS) have been suggested. While CRNS has proven its potential for monitoring soil moisture in a wide range of environments and applications, the empirical knowledge of using CRNS for snowpack monitoring is still very limited and restricted to shallow snowpacks with rather uniform evolution. The characteristics of an above-ground cosmic-ray neutron sensor (CRNS) were therefore evaluated for monitoring a mountain snowpack in the Austrian Alps (Kaunertal, Tyrol) during three winter seasons. The measurement campaign included a number of measurements during the period from 03/2014 to 06/2016: (i) neutron count measurements by CRNS, (ii) continuous point-scale SD and SWE measurements from an automatic weather station and (iii) 17 Terrestrial Laser Scanning (TLS) with simultaneous SD and SWE surveys. The highest accumulation in terms of SWE was found in 04/2014 with 600 mm. Neutron counts were compared to all available snow data. While previous studies suggested a signal saturation at around 100 mm of SWE, no complete signal saturation was found. A strong non-linear relation was found for both SD and SWE with best fits for spatially distributed TLS based snow data. Initially slightly different shapes were

  7. Modeling glacier beds in the Austrian Alps: How many lakes will form in future?

    Science.gov (United States)

    Koehler, Dominik; Geilhausen, Martin; Linsbauer, Andreas

    2014-05-01

    Glacial retreat exposes landscapes with relief characteristics greatly differing from the former ice covered surfaces. If glacial retreat exposes natural basins capable of forming proglacial lakes, then the downstream hydrologic and geomorphic systems in such catchments will be significantly altered due to discharge modifications, sediment trapping, decoupling effects and long term sediment storage (e.g. Geilhausen et al. 2013). Further implications are related to hydropower management, tourism and natural hazards. Consequently, sound knowledge of present day glacier beds ("proglacial zones of tomorrow") and in particular the total number, locations and characteristics of overdeepenings are of importance. For Austria, however, this important information about significant future changes of high alpine regions is yet missing. An interdisciplinary research project is currently in preparation to close this gap. This paper presents results of a pilot study. We used a novel GIS-based approach (GlabTop, cf. Linsbauer et al. 2012) to compute approximate glacier beds in the Austrian Alps. GlabTop ('Glacier bed Topography') is based on an empirical relation between average basal shear stress and elevation range of individual glaciers and makes use of digital elevation models (DEM), glacier outlines and branch lines (i.e. a set of lines covering all important glacier branches). DEMs and glacier outlines were derived from the Austrian glacier inventory (1998) and branch lines were manually digitized. The inventory includes 911 glaciers of which 876 (96%) were considered and 35 were excluded due to size restrictions ( 0.01 km²) with the potential of forming proglacial lakes when glacier retreat reveals the bed. The total area and volume of all overdeepenings is approx. 10 km² and 236 Mio m³ respectively and 33 lakes will be larger than 1 km³. A total glacier volume of 16 ± 5 km³ with an average ice thickness of 36 ± 11 m was calculated for 1998. Comparisons with

  8. Evidence of historical mining inferred from metal concentration of alluvial sediments in the Bernese Alps

    Science.gov (United States)

    Carvalho, Filipe; Schulte, Lothar

    2017-04-01

    Metal pollution is normally associated with modern day industrialization. However, evidences of anthropogenic metal pollution date back to the Palaeolithic, were the domestication of fire contributed to an increase of trace metals released from the burning wood. Large-scale metal pollution started during the Roman period with the increase of mining and smelting activities. The production of metals during this period was quite rudimentary and highly polluting, contributing to a raise of metal concentrations in the atmosphere and subsequently in sediments and soils. Towards the modern period, production methods were improved, especially since the industrial revolution, but continued to release pollutants to the environment. The aim of this study is to identify periods of increased mining activity though the analysis of sedimentary records. For this purpose, we study the geochemical response of trace metals in sedimentary cores from the Aare and Lütschine delta plains, located at the Bernese Alps. The focus of this analysis is the detection of metal concentration anomalies from the last 3000 years. The analysis is based on the X-Ray Fluorescence (AVATECH XRF core scanner) response of the chemical elements copper (Cu), zinc (Zn) and lead (Pb) contained in eight cores with depths down to 10 meter. All data was filtered in order to remove the noise from natural processes such as the increase of trace metal concentrations in organic rich horizons and to select the highest peaks of these metals. Results show similar trends in all the analysed cores and indicate three major pulses of trace metal concentration during the Roman Period, Early Medieval Age and a general increase of metal concentration during the Modern era, which can evidence mining and smelting activities. Periods of lower trace metal concentrations and shifts in concentration trends relate accurately with central Europe social and economic transitions, migratory events and significant demographic variations

  9. Hydrogeological and geochemical overview of the karst aquifers in the Apuan Alps (Northwestern Tuscany, Italy

    Directory of Open Access Journals (Sweden)

    Matia Menichini

    2016-06-01

    Full Text Available Apuan Alps, in north-western Tuscany (Italy, have a very complex geological structure. For this reason karst springs show very different behaviours according to the geological setting of aquifer systems. More than 80 springs are fed by carbonate aquifers; flow rates (Q range from 10 to 1600 L/s, in average, temperatures range from 8 to 15 °C. Deep and very slow groundwater flow feed some low-thermal springs (20-30 °C. Major karst springs (Q > 100 L/s are concentrated in two altimetry ranges, one from 200 to 300 m a.s.l. in the seaward side (SW-NW and a second one from 500 to 600 m a.s.l. on the inner (NE-SE side of the mountain range. Most of the springs are the final destination of large karst systems developed in meta-dolomite and marbles characterized by a very rapid flow. Some springs have a regular regime and are fed by bathyphreatic systems in metamorphic rocks or by carbonate aquifers with a major contribution of fissured drainage in non-metamorphic rocks. Large physical-chemical variations, both in space and time, are observed as a consequence of lithological heterogeneity, mixing processes and hydrodynamic conditions. Most waters are of the Ca-HCO3 type, but Ca-SO4 and Na-Cl facies are also present. A wide range of electrical conductivity is recorded, with values between 0.1 μS/cm and 10 μS/cm. Significant differences in the average isotopic signature (e.g. δ18O from -5.5 to -8.5‰ of the “base-flow” are registered due to the variability of hydrogeological basins dimension and their distribution in terms of altitude range and side. In some cases, springs with similar chemical features and located close to each other, point out very different isotopes signature, thus highlighting complicated flow path of groundwater. Furthermore, different seasonal evolutions of isotopic signatures are registered.

  10. Spodumene bearing pegmatites in the Austroalpine unit (Eastern Alps): Distribution and new geochronological data

    Science.gov (United States)

    Ilickovic, Tanja; Schuster, Ralf; Mali, Heinrich; Petrakakis, Konstantin; Schedl, Albert

    2017-04-01

    In the Austroalpine unit of the Eastern Alps spodumene bearing pegmatites occur heterogeneously distributed over an E-W distance of more than 400 km. They are usually associated with barren pegmatites which crystallisized in Permian time. There a two schools of thought about the genesis of the spodumene bearing pegmatites: Economic geologists bring forward the argument that these pegmatites only develop by fractionation of granitic parent plutons, whereas metamorphic petrologists consider that the barren pegmatites and even some highly fractionated pegmatites are products of anatexis of metapelitic country rocks. In the first case the virtual absence of co-genetic fertile granites in the Austroalpine units render the model problematic, whereas in the second case the formation of suitable Li-enriched pegmatitic melts is not yet understood. A new understanding of the Austroalpine basement through geological mapping and geochronological and geochemical investigations during the past few years gives the opportunity to reinvestigate this problem: In Permian time the Austroalpine unit was affected by lithospheric extension, causing basaltic underplating, high temperature / low pressure metamorphism and intense magmatic activity. The Permian P-T-t path is characterized by heating at slightly decreasing pressure. In an ongoing project additional spodumene bearing pegmatites have been discovered and some of them show temporal and spatial relations to relatively small leucogranitic bodies. New Sm/Nd data prove a Permian age for spodumene bearing pegmatites and leucogranites supporting a genetic relation with the barren pegmatites. Mapping revealed certain relations of pegmatites and distinct country rocks. Units of migmatitic mica schists with lots of interlayed barren pegmatites represent areas with aborted melt generation. In some places the melts accumulate forming inhomogeneous leucogranitic bodies. Examples are the Martell granite (South Tyrol) as well as leucoganites

  11. Livestock systems and farming styles in Eastern Italian Alps: an on-farm survey

    Directory of Open Access Journals (Sweden)

    Maurizio Ramanzin

    2010-01-01

    Full Text Available This research aimed to study the relationships between livestock systems, landscape maintenance and farming styles in the Belluno Province, a mountainous area of the Eastern Italian Alps. A total of 65 farms were sampled on the basis of livestock category farmed and herd size. Farms were visited to collect information on technical and productive aspects, on landscape features of land managed, which was identified by aerial photographs and digitised in a GIS environment, and on the farmers’ background, attitudes and approach to farming. Six different livestock systems were identified: intensive beef cattle (2 farms; extensive beef cattle (12 farms; large sheep/goat farms (9 farms; small sheep/goat farms (6 farms; intensive dairy cattle (14 farms and extensive dairy cattle (22 farms. The intensive systems had larger herds, modern structures and equipment, and were strongly production oriented, whereas the extensive systems had smaller herds and productivity, with often traditional or obsolete structures and equipment, but showed a tendency to diversify production by means of on-farm cheese making and/or mixed farming of different livestock categories. The ability to maintain meadows and pastures was greater for the extensive systems, especially in steep areas, while the annual nitrogen output, estimated as kg N/ha, was lower. Data on the farmers’ background and attitudes were analysed with a non-hierarchical cluster procedure that clustered the farmers into 4 farming styles widely different in motivations to farming, innovative capability, and ability to diversify income sources and ensure farm economic viability. The farming styles were distributed across all livestock systems, indicating the lack of a linkage between the assignment of a farm to a livestock system and the way the farm is managed. This study demonstrates that in mountain areas variability of livestock systems may be high, and that they differ not only in production practices

  12. Multi Source Remote Sensing for Monitoring Light-Absorbing Impurities on Snow and Ice in the European Alps

    Science.gov (United States)

    Colombo, R.; Baccolo, G.; Garzonio, R.; Massabò, D.; Julitta, T.; Rossini, M.; Ferrero, L.; Delmonte, B.; Maggi, V.; Mattavelli, M.; Panigada, C.; Cogliati, S.; Cremonese, E.; Di Mauro, B.

    2016-12-01

    The European Alps are located close to one of the most industrialized areas of the planet and they are 3.000 km from the largest desert of the Earth. Light-absorbing impurities (LAI) emitted from these sources can reach the Alpine chain and deposit on snow covered areas and mountain glaciers. Although several studies show that LAI have important impacts on the optical properties of snow and ice, reducing the albedo and promoting the melt, this impact has been poorly characterized in the Alps. In this contribution, we present the results of a multisource remote sensing approach aimed to study the LAI impact on snow and ice properties in the Alpine area. This process has been observed by means of remote and proximal sensing methods, using satellite (Landsat 8, Hyperion and MODIS data), field spectroscopy (ASD measurements), Automatic Weather Stations, aerial surveys (Unmanned Aerial Vehicle), radiative transfer modeling (SNICAR and TARTES) and laboratory analysis (hyperspectral imaging system). Furthermore, particle size (Coulter Counter), geochemical (Instrumental Neutron Activation Analysis, INAA) and optical (Multi-Wavelength Absorbance Analyzer, MWAA) analyses have been applied to determine the nature and radiative properties of particulate material deposited on snow and ice or aggregated into cryoconite holes. Our results demonstrate that LAI can be monitored from remote sensing at different scale. LAI showed to have a strong impact on the Alpine cryosphere, paving the way for the assessment of their role in melting processes.

  13. Monitoring of forest decline in forest ecosystems of the Bavarian Alps; Monitoring von Schaeden in Waldoekosystemen des bayerischen Alpenraumes

    Energy Technology Data Exchange (ETDEWEB)

    Rehfuess, K.E.; Osswald, W.F.; Ewald, J.; Reuther, M. [Technische Univ. Muenchen (Germany). Lehrstuhl fuer Bodenkunde und Standortslehre; Nechwatal, J.; Lang, K. [Technische Univ. Muenchen (Germany). Lehrstuhl fuer Forstbotanik - Arbeitsgruppe Phytopathologie

    2000-09-01

    This regional multifactorial investigation addresses the dependence of vitality of Norway spruce and European beech (crown transparency, site index, root systems and nutritional status) on ecological factors and the presence of pathogens in mountain forests of the Bavarian Alps (Germany). Existing data on airborne deposition and ozone concentrations were supplemented by 2 elevational transects, in which wet bulk deposition was measured and ozone passive samplers were exposed during 2 vegetation periods. The distribution of crown transparency in spruce and beech as related to site conditions and its relationships with long-term stand growth, nutritional status and root morphology suggest that transparent crowns as observed in the Calcareous Alps are nothing new and unlikely to be caused by atmospheric pollution. Their distribution must be regarded as an old, long-lasting and natural pattern of tree vitality. (orig.) [German] Es wurde die Abhaengigkeit der Vitalitaet von Fichten und Buchen (Kronentransparenz, Bestandesbonitaet, Wurzel- und Ernaehrungszustand) in den Bergwaeldern des Werdenfelser Landes (Oberbayern) von Standortsfaktoren und vom Befall durch pilzliche Pathogene mit einem regionalstatistischen, multifaktoriellen Ansatz untersucht. Vorhandene Daten zu Stoffeintrag und Ozonbelastung wurden durch eine zweijaehrige Beprobung des Freilandniederschlags und Ozon-Passivsammler-Messungen in zwei Hoehenprofilen ergaenzt. Die standortbezogene Verteilung der Kronentransparenz und ihre Beziehungen zum langfristigen Bestandeswachstum, zum Ernaehrungs- und Wurzelzustand legen nahe, dass es sich in den Kalkalpen nicht um neuartige, immissionsbedingte Waldschaeden, sondern um seit Alters her bestehende, natuerliche Vitalitaetsunterschiede handelt. (orig.)

  14. Application of Phase-Weighted Stacking to Low-Frequency Earthquakes near the Alpine Fault, Central Southern Alps, New Zealand

    Science.gov (United States)

    Baratin, L. M.; Townend, J.; Chamberlain, C. J.; Savage, M. K.

    2015-12-01

    Characterising seismicity in the vicinity of the Alpine Fault, a major transform boundary late in its typical earthquake cycle, may provide constraints on the state of stress preceding a large earthquake. Here, we use recently detected tremor and low-frequency earthquakes (LFEs) to examine how slow tectonic deformation is loading the Alpine Fault toward an anticipated major rupture. We work with a continuous seismic dataset collected between 2009 and 2012 from a network of short-period seismometers, the Southern Alps Microearthquake Borehole Array (SAMBA). Fourteen primary LFE templates have been used to scan the dataset using a matched-filter technique based on an iterative cross-correlation routine. This method allows the detection of similar signals and establishes LFE families with common hypocenter locations. The detections are then combined for each LFE family using phase-weighted stacking (Thurber et al., 2014) to produce a signal with the highest possible signal to noise ratio. We find this method to be successful in increasing the number of LFE detections by roughly 10% in comparison with linear stacking. Our next step is to manually pick polarities on first arrivals of the phase-weighted stacked signals and compute preliminary locations. We are working to estimate LFE focal mechanism parameters and refine the focal mechanism solutions using an amplitude ratio technique applied to the linear stacks. LFE focal mechanisms should provide new insight into the geometry and rheology of the Alpine Fault and the stress field prevailing in the central Southern Alps.

  15. [Which organization for the management of thoracic cancer? Results from a French survey in Rhône-Alpes region].

    Science.gov (United States)

    Couraud, S; Fournel, P; Moro-Sibilot, D; Pérol, M; Souquet, P-J

    2012-02-01

    This survey, conducted in Rhône-Alpes region (France), aims to better understand the actual conditions of practice in thoracic oncology. A questionnaire was distributed to all oncologists, pulmonologists, radiotherapy physicians and thoracic surgeons in the region. Of 401 questionnaires, the response rate was 56%. Among the responders 46% reported exercising the Thoracic Oncology (TO). Most physicians practicing TO are pulmonologists (62%). The majority (45%) are engaged in secondary hospital or university hospital (27%). However, practitioners with the most important activity exerts in university hospitals and cancer centre (71% of physicians practicing in secondary hospitals and 75% of those in private practice reported to manage fewer than 80 new NSCLC cases per year in structure). Furthermore, 91% are regularly involved in a multidisciplinary team. Radiation oncologist, pulmonologists and thoracic surgeons are assiduous to these meeting; however radiologists and, to a lesser extent, pathologists are less attentive. Moreover, 92% of practitioners belong to cancer networks. Similarly, over one third of working together in a cooperative clinical research institution and nearly half are involved in clinical trials (with nearly half in secondary hospital). These results highlight the reality of practice in Rhône-Alpes and will serve as the basis for coordinating authorities to correct dysfunctions or monitor certain activities of interest (clinical trials). Copyright © 2011 Elsevier Masson SAS. All rights reserved.

  16. Soil warming increased whole-tree water use of Pinus cembra at the treeline in the Central Tyrolean Alps

    Science.gov (United States)

    Wieser, Gerhard; Grams, Thorsten E.E.; Matysssek, Rainer; Oberhuber, Walter; Gruber, Andreas

    2016-01-01

    The study quantified the effect of soil warming on sap flow density (Qs) of Pinus cembra at treeline in the Central Tyrolean Alps. To enhance soil temperature we installed a transparent roof construction above the forest floor around six trees. Six other trees served as controls in the absence of any manipulation. Roofing enhanced growing season mean soil temperature by 1.6, 1.3, and 1.0 °C at 5, 10, and 20 cm soil depth, respectively, while soil water availability was not affected. Sap flow density (using Granier-type thermal dissipation probes) and environmental parameters were monitored throughout three growing seasons. During the first year of treatment, no warming effect was detected on Qs. However, soil warming caused Qs to increase significantly by 11 and 19% above levels in control trees during the second and third year, respectively. This effect appeared to result from warming-induced root production, a reduction in viscosity and perhaps an increase also in root hydraulic conductivity. Hardly affected were leaf-level net CO2 uptake rate and conductance for water vapor, so that water-use efficiency stayed unchanged as confirmed by needle δ13C analysis. We conclude that tree water loss will increase with soil warming, which may alter the water balance within the treeline ecotone of the Central Austrian Alps in a future warming environment. PMID:25737326

  17. Extensive Analysis of Elastase-Induced Pulmonary Emphysema in Rats: ALP in the Lung, a New Biomarker for Disease Progression?

    Science.gov (United States)

    Inoue, Ken-ichiro; Koike, Eiko; Yanagisawa, Rie; Takano, Hirohisa

    2010-01-01

    It is accepted that pulmonary exposure of rodents to porcine pancreatic elastase (ELT) induces lesions that morphologically resemble human emphysema. Nonetheless, extensive analysis of this model has rarely been conducted. The present study was designed to extensively examine the effects of ELT on lung inflammation, cell damage, emphysematous change, and cholinergic reactivity in rats. Intratracheal administration of two doses of ELT induced 1) a proinflammatory response in the lung that was characterized by significant infiltration of macrophages and an increased level of interleukin-1β in lung homogenates, 2) lung cell damage as indicated by higher levels of total protein, lactate dehydrogenase, and alkaline phosphatase (ALP) in lung homogenates, 3) emphysema-related morphological changes including airspace enlargement and progressive destruction of alveolar wall structures, and 4) airway responsiveness to methacholine including an augmented Rn value. In addition, ELT at a high dose was more effective than that at a low dose. This is the novel study to extensively analyze ELT-induced lung emphysema, and the analysis might be applied to future investigations that evaluate new therapeutic agents or risk factors for pulmonary emphysema. In particular, ALP in lung homogenates might be a new biomarker for the disease progression/exacerbation. PMID:20216950

  18. ACTIVITIES OF ALT, AST, ALP AND LDH ENZYMES IN CATTLE BLOOD PLASMA DEPENDING ON REPRODUCTIVE CYCLE AND SEASONAL CHANGES

    Directory of Open Access Journals (Sweden)

    Nejra Hadžimusić

    2013-03-01

    Full Text Available The study was aimed at determining levels of alanin aminotransferase (ALT, aspartate aminotransferase (AST, alkaline phosphatase (ALP and lactate dehydrogenase (LDH in the plasma of 229 dairy Holstein-Friesian breed cows in different stages of the re¬production cycle and regarding the seasonal changes (diet conditions. Cows were divided into the groups: lactation (Group A, postpartal period within 15 days from calving (Group B and dry period (Group C. Seasonal variations affected AST activity within Groups A and B, while Group C showed no seasonal influence. Differences between Groups A and B were determined during winter, as well as among Groups A and C during the same season. The highest activity of ALT was measured in cows from Group A during the winter season. ALP activity showed no statistical difference among groups, though statistical significance was noted within seasonal changes. The activity of LDH showed no statistical significance within Group C with regard to the seasonal changes. Statistically significant difference was found between cows of Group A and C during the winter season. Differences were considered statistically significant when p<0,05.Research results showed a significant influence of milk production and dry period on the activities of measured enzymes in the blood plasma so we can conclude that there is a need for constant monitoring of the described parameters during the production period.Key words: dairy cows, ALT, AST, ALT, LDH

  19. Holocene vegetation and fire dynamics at Crveni Potok, a small mire in the Dinaric Alps (Tara National Park, Serbia)

    Science.gov (United States)

    Finsinger, Walter; Morales-Molino, Cesar; Gałka, Mariusz; Valsecchi, Verushka; Bojovic, Srdjan; Tinner, Willy

    2017-07-01

    We analysed sediments from Crveni Potok (Tara Mountains, Serbia), a key site in the Dinaric Alps because it is located within the restricted distribution range of the endemic conifer Picea omorika (Serbian spruce), and thereby bears a unique potential in revealing its Holocene history. We used a set of proxies (pollen, plant-macrofossils, charcoal) to reconstruct the long-term vegetation and fire histories at different spatial scales. The comprehensive snapshot provided by the reconstructions fill an important gap of European long-term vegetation and fire histories in the overall data-coverage poor region of the Dinaric Alps. The reconstructions unfolded an unusual late-Holocene persistence of high forest cover that contrasts with the large majority of European landscape-scale forest-cover records, which show massive anthropogenic openings in the past two millennia. We also found evidence for good post-fire recovery of the currently threatened endemic P. omorika populations. This leads us to suggest that prescribed-burning programmes may be beneficial to reduce the vulnerability of the species, and for ecological restoration and conservation purposes of the declining and endangered populations.

  20. 6-kyr record of flood frequency and intensity in the western Mediterranean Alps - Interplay of solar and temperature forcing

    Science.gov (United States)

    Sabatier, Pierre; Wilhelm, Bruno; Ficetola, Gentile Francesco; Moiroux, Fanny; Poulenard, Jérôme; Develle, Anne-Lise; Bichet, Adeline; Chen, Wentao; Pignol, Cécile; Reyss, Jean-Louis; Gielly, Ludovic; Bajard, Manon; Perrette, Yves; Malet, Emmanuel; Taberlet, Pierre; Arnaud, Fabien

    2017-08-01

    The high-resolution sedimentological and geochemical analysis of a sediment sequence from Lake Savine (Western Mediterranean Alps, France) led to the identification of 220 event layers for the last 6000 years. 200 were triggered by flood events and 20 by underwater mass movements possibly related to earthquakes that occurred in 5 clusters of increase seismicity. Because human activity could influence the flood chronicle, the presence of pastures was reconstructed through ancient DNA, which suggested that the flood chronicle was mainly driven by hydroclimate variability. Weather reanalysis of historical floods allow to identify that mesoscale precipitation events called "East Return" events were the main triggers of floods recorded in Lake Savine. The first part of this palaeoflood record (6-4 kyr BP) was characterized by increases in flood frequency and intensity in phase with Northern Alpine palaeoflood records. By contrast, the second part of the record (i.e., since 4 kyr BP) was phased with Southern Alpine palaeoflood records. These results suggest a palaeohydrological transition at approximately 4 kyr BP, as has been previously described for the Mediterranean region. This may have resulted in a change of flood-prone hydro-meteorological processes, i.e., in the balance between occurrence and intensity of local convective climatic phenomena and their influence on Mediterranean mesoscale precipitation events in this part of the Alps. At a centennial timescale, increases in flood frequency and intensity corresponded to periods of solar minima, affecting climate through atmospheric changes in the Euro-Atlantic sector.

  1. The Effects of the Planned High-Speed Rail System on Travel Times and Spatial Development in the European Alps

    Directory of Open Access Journals (Sweden)

    Elisa Ravazzoli

    2017-02-01

    Full Text Available One of the direct effects of introducing high-speed railway lines is a significant reduction in travel times between major cities. This is particularly relevant in mountain areas. It not only makes cities more easily reachable with more sustainable transport systems but can also encourage different travel behavior and reduce environmental pressures on sensitive areas. A comprehensive analysis of the spatiotemporal effects of the introduction of high-speed railways in the Alpine arc has not yet been developed. To help fill this gap, this study uses multidimensional scaling and the geographical information system to illustrate the time–space compression. This term indicates the erosion of spatial and temporal distances in the areas of the Alps directly affected by the new railway lines. Six trans-Alpine high-speed railway lines are analyzed, comparing current and projected travel times by train. A time-based map is created to show the time–space compression in every transversal direction, particularly on the French and the Austrian side of the Alps. Implications in terms of local accessibility are also analyzed, focusing on the Autonomous Province of Bolzano/Bozen-South Tyrol. Finally, the paper discusses the importance of time-based maps for the understanding of sociospatial dynamics and the possible implications for spatial development.

  2. Rethinking Pumped Storage Hydropower in the European Alps: A Call for New Integrated Assessment Tools to Support the Energy Transition

    Directory of Open Access Journals (Sweden)

    Astrid Björnsen Gurung

    2016-05-01

    Full Text Available The European Alps are well positioned to contribute significantly to the energy transition. In addition to sites with above-average potential for wind and solar power, the “water towers” of Europe provide flexible, low-carbon power generation as well as energy storage. In the future, hydropower systems are expected to become more than mere electricity generators, serving a key role as flexible complements to intermittent power generators and as providers of large-scale seasonal and daily energy storage. Energy transition on national and European scales can be facilitated by expanding the capacity of pumped storage hydropower (PSHP plants. Yet the extension of hydropower production, in particular PSHP, remains controversial, primarily due to environmental concerns. Focusing on 2 Alpine countries, Austria and Switzerland, this paper provides a system view of hydropower production and energy storage in the Alps. It discusses advantages and drawbacks of various assessment tools and identifies gaps and needs for the integrated assessment of PSHP plants. It concludes that instruments that evaluate the impacts and sustainability of PSHP projects need to be developed, elaborated, and applied in a participatory manner, in order to promote public dialogue, increase social acceptance, and, ideally, encourage energy consumers to become advocates of a sustainable energy future.

  3. Processing and preliminary results of NFP/PNR20 seismic reflection profiles from the Western Swiss Alps

    Science.gov (United States)

    Levato, L.; Pruniaux, B.; Burri, M.; Escher, A.; Olivier, R.; Sellami, S.; Wagner, J.-J.

    1993-03-01

    Results of near-vertical seismic reflection profiling conducted in the western Swiss Alps are presented. All profiles were recorded using both high-fold Vibroseis and high-energy but low-fold dynamite sources, yielding two independent data sets. The Vibroseis seismic sections provide markedly superior resolution of upper crustal units down to the top of the crystalline basement. On these sections, high-impedance contrasts within the nappes are the source of strong reflections, and the basal thrust of the Penninic nappes (Penninic front) delineates a lateral change in reflection character. By comparison, the dynamite sections provide generally higher-quality images of the deep crust. In particular, they show prominent bands of strong reflections in the lower crust and a well-defined reflection Moho deepening from ~ 12 s (about 36 km) in the north to ~ 16 s (about 48 km) in the south. It is concluded that both types of data are required to resolve accurately shallow and deep structures in the Swiss Alps. Preliminary results of the dynamite survey from the most recently recorded line support proposals that shortening of the basement in the external domain has occurred, in agreement with interpretations of the ECORS-CROP seismic reflection line further south.

  4. Using the “Footprint” Approach to Examine the Potentials and Impacts of Renewable Energy Sources in the European Alps

    Directory of Open Access Journals (Sweden)

    Richard Hastik

    2016-05-01

    Full Text Available The expansion of renewable energies is regarded as a key way to mitigate global climate change and to ensure the provision of energy in the long term. However, conflicts between these goals and local nature conservation goals are likely to increase because of the additional space required for renewable energies. This is particularly true for mountainous areas with biodiversity-rich ecosystems. Little effort has been undertaken to systematically compare different renewable energy sources and to examine their environmental impacts using an interdisciplinary approach. This study adapted the concept of the “ecological footprint” to examine the impact on ecosystem services of land use changes involved in exploiting renewable energy sources. This innovative approach made it possible to assess and communicate the potentials of those energy sources in light of both space consumption and sustainability. The European Alps are an ideal test area because of their high energy potentials and biodiversity-rich ecosystems and the high demand for multiple ecosystem services. Our results demonstrate that energy consumption in the Alps could not be covered with the available renewable energy potentials, despite the utilization of large parts of the Alpine land area and the majority of larger rivers. Therefore, considerable effort must be invested in resolving conflicting priorities between expanding renewable energies and nature conservation, but also in realizing energy-saving measures. To this end, the approach presented here can support decision-making by revealing the energy potentials, space requirements, and environmental impacts of different renewable energy sources.

  5. Strategy for the deployment of a dense broadband temporary array in the Alps: lessons learnt from the CIFALPS experiment

    Science.gov (United States)

    Coralie, Aubert; Anne, Paul; Stefano, Solarino; Sandrine, Roussel; Simone, Salimbeni; Pierre, Zangelmi; Glenn, Cougoulat; Yinshuang, Ai; Weiwei, Xu; Yumei, He; Liang, Zhao

    2013-04-01

    The CIFALPS (China-Italy-France Alps seismic survey) experiment is a common project of IGGCAS (China), ISTerre (France) and INGV (Italy). It aims at getting new high-resolution passive seismic data on the crustal and upper mantle structure of the southwestern Alps. In this framework, we have installed a temporary broadband seismic array across the southwestern Alps from the Rhône valley (France) to the Po plain (Italy). The main sub-array of CIFALPS is a 350-km long roughly linear profile of 46 stations trending WSW-ENE from Bollène (France) to north of Alessandria (Italy). The average station spacing is 10 km in the outer parts of the belt, and it reduces to 5 km in the internal Alps. Nine additional temporary stations located ~40 km to the north and south of the main profile complement the permanent broadband networks to improve the 3-D constraints on the deep structures. Stations are equipped with Nanometrics Taurus data acquisition systems, and Trillium 120P/A, CMG3-ESP or CMG40T broadband sensors. The array was installed in the summer of 2012 and will be operated at least to April 2013. Because our schedule was tight, we had to achieve site selections in only 3-4 months in spite of strong constraints on site location related to short interstation spacing. Most sites are located in basements of buildings for security reasons and mains power supply. As most sensors are true broadband (90s or 120s), we put much effort on vault design to insure good thermal insulation and low noise at long periods. The vaults also had to be easily and rapidly built and they should be easily and totally removed at the end of the experiment. We used the PQLX software for quality control of our sites and vault design. The performances of our vaults are good for the vertical component with noise levels at 100s period in the range -185 dB (low noise model) to -165 dB. They are less good for horizontal components (noise level close to high noise model at periods > 20s) due to

  6. Fluvial sediment transport in a glacier-fed high-mountain river (Riffler Bach, Austrian Alps)

    Science.gov (United States)

    Morche, David; Weber, Martin; Faust, Matthias; Schuchardt, Anne; Baewert, Henning

    2017-04-01

    High-alpine environments are strongly affected by glacier retreat since the Little Ice Age (LIA). Due to ongoing climate change the hydrology of proglacial rivers is also influenced. It is expected that the growing proportions of snow melt and rainfall events will change runoff characteristics of proglacial rivers. Additionally, the importance of paraglacial sediment sources in recently deglaciating glacier forefields is increasing, while the role of glacial erosion is declining. Thus complex environmental conditions leading to a complex pattern of fluvial sediment transport in partly glaciated catchments of the European Alps. Under the umbrella of the joint PROSA-project the fluvial sediment transport of the river Riffler Bach (Kaunertal, Tyrol, Austria) was studied in 3 consecutive ablation seasons in order to quantify sediment yields. In June 2012 a probe for water level and an automatic water sampler (AWS) were installed at the outlet of the catchment (20km2). In order to calculate annual stage-discharge-relations by the rating-curve approach, discharge (Q) was repeatedly measured with current meters and by salt dilution. Concurrent to the discharge measurements bed load was collected using a portable Helley-Smith sampler. Bed load samples were weighted and sieved in the laboratory to gain annual bed load rating curves and grain size distributions. In total 564 (2012: 154, 2013: 209, 2014: 201) water samples were collected and subsequently filtered to quantify suspended sediment concentrations (SSC). Q-SSC-relations were calculated for single flood events due to the high variability of suspended sediment transport. The results show a high inter- and intra-annual variability of solid fluvial sediment transport, which can be explained by the characteristics of suspended sediment transport. Only 13 of 22 event-based Q-SSC-relations show causal dependency. In 2012, during a period with multiple pluvial-induced peak discharges most sediment was transported. On the

  7. Digital structural interpretation of mountain-scale photogrammetric 3D models (Kamnik Alps, Slovenia)

    Science.gov (United States)

    Dolžan, Erazem; Vrabec, Marko

    2015-04-01

    From the earliest days of geological science, mountainous terrains with their extreme topographic relief and sparse to non-existent vegetation were utilized to a great advantage for gaining 3D insight into geological structure. But whereas Alpine vistas may offer perfect panoramic views of geology, the steep mountain slopes and vertical cliffs make it very time-consuming and difficult (if not impossible) to acquire quantitative mapping data such as precisely georeferenced traces of geological boundaries and attitudes of structural planes. We faced this problem in mapping the central Kamnik Alps of northern Slovenia, which are built up from Mid to Late Triassic succession of carbonate rocks. Polyphase brittle tectonic evolution, monotonous lithology and the presence of temporally and spatially irregular facies boundary between bedded platform carbonates and massive reef limestones considerably complicate the structural interpretation of otherwise perfectly exposed, but hardly accessible massif. We used Agisoft Photoscan Structure-from-Motion photogrammetric software to process a series of overlapping high-resolution (~0.25 m ground resolution) vertical aerial photographs originally acquired by the Geodetic Authority of the Republic of Slovenia for surveying purposes, to derive very detailed 3D triangular mesh models of terrain and associated photographic textures. Phototextures are crucial for geological interpretation of the models as they provide additional levels of detail and lithological information which is not resolvable from geometrical mesh models alone. We then exported the models to Paradigm Gocad software to refine and optimize the meshing. Structural interpretation of the models, including mapping of traces and surfaces of faults and stratigraphic boundaries and determining dips of structural planes, was performed in MVE Move suite which offers a range of useful tools for digital mapping and interpretation. Photogrammetric model was complemented by

  8. Mid- and late Holocene human impact recorded by the Coltrondo peat bog (NE Italian Alps)

    Science.gov (United States)

    Segnana, Michela; Poto, Luisa; Gabrieli, Jacopo; Martino, Matteo; Oeggl, Klaus; Barbante, Carlo

    2016-04-01

    Peat bogs are ideal archives for the study of environmental changes, whether these are natural or human induced. Indeed, receiving water and nutrients exclusively from dry and wet atmospheric depositions, they are among the most suitable matrices for palaeoenvironmental reconstruction. The present study is focused on the Eastern sector of the Italian Alps, where we sampled the Coltrondo peat bog, in the Comelico area (ca. 1800 m a.s.l.) The knowledge of the human history in this area is rather scarce: the only pieces of archaeological evidence found in this area dates back to the Mesolithic and the absence of later archaeological finds makes it difficult to reconstruct the human settlement in the valley. With the main aim to obtain information about the human settlement in that area we selected a multi-proxy approach, combining the study of biotic and abiotic sedimentary components archived in the 7900 years-peat bog record. Pollen analysis is performed along the core registering human impacts on the area from ca. 2500 cal BP, when land-use changes are well evidenced by the presence of human-related pollen and non-pollen palynomorphs (NPPs), as well as by the increase in micro-charcoal particles. Periods of increased human impact are recorded at the end of the Middle Ages and later, at the end of the 19th century. The analysis of trace elements, such as lead, is performed by means of ICP-MS technique and its enrichment factor (EF) is calculated. A first slight increase of Pb EF during Roman Times is possibly related to mining activities carried out by the Romans. Mining activities carried out in the area are registered during the Middle Ages, while the advent of the industrialization in the 20th century is marked by the highest EF values registered on the top of the core. To help and support the interpretation of geochemical data, lead isotopes ratios are also measured using ICP-MS to discriminate between natural and anthropogenic sources of lead. The 206Pb/207Pb

  9. Regional-scale controls of periglacial rockfalls (Turtmann valley, Swiss Alps)

    Science.gov (United States)

    Messenzehl, Karoline; Hoffmann, Thomas; Meyer, Hanna; Dikau, Richard

    2015-04-01

    Rockfalls are among the most hazardous processes in mountain regions and of major importance for landform evolution and sediment budgets. The rockfall activity varies significantly in space and time, driven by the complex interplay between locally dynamic variables (i.e. discontinuities, freeze-thaw processes) as well as system inherent predisposing factors dominating at a regional scale. Many studies focus on small-scale triggering conditions for rockfalls, but the effects of regional-scale controls leading to a basic instability of alpine rockwalls, such as topo-climatic settings, lithology and i.e. tectonic structures as well as paraglacial adjustments, are poorly understood. In this study, we aim to understand the role of regional-scale controls of rockfalls in the Turtmann Valley, which covers 110 km2 in the Swiss Alps. Based on an inventory of 220 talus slopes (Otto et al. 2009), rockfall source areas were determined and their causal relationship between ten different prediction variables was assessed. By combining two multivariate statistical models, we (i) explained the spatial pattern of rockfalls, (ii) evaluated the relative importance of potential predisposing factors (iii) and discuss these regional-scale controls in the light of the local-scale geomorphic and rock mechanical settings. Major finding are: (i) A stepwise logistic regression (LR) based on principal components and a random forests (RF) model were performed and validated using a 75%-subset of the rockfall source areas. Given the area under the ROC curves for both approaches, LR: 0.92, RF: 0.99, respectively, the RF model performs slightly better to explain the large-scale variability of rockfalls in our study area. (ii) Both, the LR and RF model reveal that lithology and joint orientation have the strongest causal influence on rockfalls at regional scale. In contrast, topo-climatic factors (elevation, slope, solar radiation) might be of secondary importance. Additionally, the regional

  10. Chrysotile asbestos quantification in serpentinite quarries: a case study in Valmalenco, central Alps, northern Italy

    Science.gov (United States)

    Cavallo, Alessandro

    2013-04-01

    Outcrops of serpentinites are usually strongly fractured and cataclastic, and the rock can only be used as ballast. However, in rare cases, like in Valmalenco (Central Alps, Northern Italy), fractures are regular and well spaced, and the rock mass has good geotechnical quality, ideal conditions for the extraction of dimension stone blocks. The Valmalenco Serpentinite is marketed worldwide as dimension and decorative stone, with remarkable mechanical properties and pleasing colours and textures. However, the same area was once subject to chrysotile asbestos mining, in the form of discrete veins along the main discontinuities of the rock mass. For this reason, airborne asbestos contamination can occur during the extraction and processing cycle of the rocks, therefore it is essential to locate and quantify asbestos in the rock mass, to reduce as much as possible the exposure risk. The first step was a detailed geostructural survey of each quarry, in order to characterize the main discontinuities (orientation, spacing, linear persistence, opening, filling), with special attention to the identification of fibrous minerals. The surveys was followed by extensive sampling of massive rocks, mineralized veins and fillings of fractures, and the cutting sludge derived from diamond wire cutting. Preliminary qualitative XRPD was performed on all samples, while quantitative analysis was carried out on the most representative samples of the main rock mass discontinuities. On the other hand, XRPD is not effective in the identification of asbestos percentages of less than 2% by weight, and the accurate distinction among the various serpentine polymorphs (antigorite, lizardite, chrysotile) is very difficult (if not impossible) when they are simultaneously present, due to their very similar basic structure and the strong structural disorder. The same samples were then analyzed by SEM-EDS (fiber counting after filtration on a polycarbonate filter), for a better distinction between

  11. Glacial and periglacial environment monitoring in Aosta Valley - Northwestern Italian Alps

    Science.gov (United States)

    Motta, Elena; Cremonese, Edoardo; Morra di Cella, Umberto; Pogliotti, Paolo; Vagliasindi, Marco

    2010-05-01

    Aosta Valley is a small alpine region of about 3.300 km2 located in the NW Italy, on the southern side of the Alps and surrounded by the highest Alpine peaks such as Mont Blanc (4810m), Mont Rose (4634m) and Cervino (4478m), More than 50% of the territory has an elevation above 2000 metres asl. High mountain, glacial and periglacial environments cover a significant part of the territory. As the cryosphere is strongly sensitive to climate change, global warming effects are particularly evident in this alpine region, and they often affect environment and social and economic life, thus representing a key issue for politicians and people working and living in the valley. Among these effects, some of the most important are the decrease of water storage due to glaciers retreat and the increasing natural hazards as a consequence of rapid environmental dynamics. Hence the importance of monitoring glacial and periglacial environment, in order to quantify effects of climate change, to detect new dynamics and to manage consequences on the environment and the social life. In Aosta Valley the understanding of these phenomena is carried out by means of several actions, both at a regional scale and on specific representative sites. A multi-temporal analysis of aerial photographs, orthophotos and satellite imagery allows to detect glaciers evolution trend at a regional scale. All this information is collected in a Regional Glacier inventory, according to the World Glaciers Inventory standard and recommendations. Analysis of the information collected in the Inventory show that the total area presently covered by glaciers is about 135 km2; area changes occurred in the past has been about -44.3 km2, and -17 km2. between 1975 and 2005. Glacier inventory also gathers - for each of the about 200 glaciers - morphological data, information about events and photos both historical and present. Glacier mass balance (the difference resulting from the mass gained by the glacier through the

  12. Predicting debris flow occurrence in Eastern Italian Alps based on hydrological and geomorphological modelling

    Science.gov (United States)

    Nikolopoulos, Efthymios I.; Borga, Marco; Destro, Elisa; Marchi, Lorenzo

    2015-04-01

    located in the Upper Adige region, Eastern Italian Alps. Analysis involved eight debris-flow triggering storms for which high-quality radar-rainfall fields and a detailed debris flow record (with a total of 87 occurrences) is available. Results show that in all cases examined TI exhibits significant skill in predicting debris flow occurrence. However, sensitivity analysis of the results on the channel width scaling functions, the grain size and peak flow estimation uncertainty revealed considerable variability in the results. This suggests that successful application of TI as a predictor in a warning system requires local adjustment of the channel width law and grain size parameters while characterization of uncertainty in hydrologic model predictions should also be considered. Berti, M., Simoni, A., 2005: Experimental evidences and numerical modelling of debris flow initiated by channel runoff. Landslides, 2 (3), 171-182. Gregoretti, C. and G. Dalla Fontana, 2008: The triggering of debris flow due to channel-bed failure in some alpine headwater basins of the Dolomites: analyses of critical runoff. Hydrol. Process. 22, 2248-2263. Tognacca C., Bezzola G.R., Minor H.E., 2000: Threshold criterion fo debrisflow initiation due to channel bed failure. In Proceedings of the Second International Conference on Debris Flow Hazards Mitigation Taipei,August, Wiezczorek, Naeser (eds): 89-97.

  13. Clastic Sediment Dispersal in Rifted Margins, an Example From the Swiss Alps

    Science.gov (United States)

    Galster, Federico; Stockli, Daniel

    2017-04-01

    temperatures above 700°C are drastically reduced and the input of rutile from mafic sources as well as a Permo-Triassic population is observed. This trend marks the compartmentalization of the European margin in sub-basins, the emergence and rapid unroofing of local sources and the progressive reduction and eventual disconnection from far-field sources. However, eventually this period leads to the creation of new sediment dispersal pathways tapping into very far-field sources, as deduced from the Cretaceous DR record. In particular, Aptian to Cenomanian ("Gault") sedimentary strata in the Helvetic, North Penninic, and Briançonnais domains show remarkable similarities, incl. the reappearance of abundant Mid-Proterozoic zircons and the appearance, for the first time in the system, of Paleoproterozoic (1.8-2 Ga) rutiles. This trend marks the general subsidence of the rifted margin and the instauration of strong longitudinal currents. The appearance of abundant Paleoproterozoic rutile in central Europe, whose basement has been formed and repeatedly metamorphosed during the late Proterozoic and the Paleozoic, suggests a source located to the east of the Tornquist-Teisseyre zone, in the basement of the East European platform and a direct connection through E-W currents between the Outer Carpathians and the Central Alps.

  14. Multidisciplinary insights into the seismotectonics of the Swiss Alps and its foreland

    Science.gov (United States)

    Diehl, Tobias; Lee, Timothy; Houlié, Nicolas; Cardello, Giovanni Luca; Kraft, Toni; Clinton, John; Kissling, Edi; Wiemer, Stefan

    2017-04-01

    Information on structure and mechanics of fault systems and their connection with present-day seismicity is key to the understanding of neotectonic processes in the Swiss Alps and the northern Swiss Foreland. Precisely determined focal depths in combination with high-resolution structural models can provide important insight into deformation styles of the uppermost crust (e.g. thin- vs. versus thick-skinned tectonics). Detailed images of seismogenic fault zones combined with estimates on deformation rates from geodesy, on the other hand, will improve the assessment of the hazard related to natural and induced earthquakes in those regions. In the framework of various projects, studies have been recently undertaken to image seismogenic fault zones at high resolution, with a special focus on southwest and northeast Switzerland because of their high societal relevance. Southwest Switzerland, is the region with one of the highest natural seismic hazard in the country. A large part of the present-day seismic activity is related to an earthquake lineament located in the southern part of the Rawil depression, which is dominated by strike-slip faulting. The possibility of large magnitude earthquakes critically depends on the question as to whether this activity is related to a single fault of considerable lateral and vertical extension or not. Field data demonstrate oblique normal faulting and fault segmentation at surface related to mountain uplift at the curvature of the Alpine Arc. Studies of seismogenic structures and neotectonic processes in the northeast Molasse basin, on the other hand, are of special interest, since the region is one of the target sites for radioactive waste repositories and future geothermal plants. On-going densification of the seismic network in Switzerland and new detection algorithms have significantly lowered the detection threshold of microearthquakes and improved data coverage in most parts of the country over the last ten years. To

  15. Rapid evolution of the paraglacial Moosfluh rock slope instability (Swiss Alps) captured by Sentinel-1

    Science.gov (United States)

    Manconi, Andrea; Glueer, Franziska; Loew, Simon

    2017-04-01

    The Great Aletsch Region (GAR, Swiss Alps) has undergone to several cycles of glacial advancement and retreat, which have deeply affected the evolution of the surrounding landscape. Currently, this region is one of the places where the effects of climate change can be strikingly observed, as the Aletsch glacier is experiencing a remarkable retreat with rates in the order of 50 meters every year. In particular, a deep-seated slope instability located in the area called "Moosfluh" has shown during the past 20 years evidences of a slow but progressive increase of surface displacement. The moving mass associated to the Moosfluh rockslide affects an area of about 2 km2 and entails a volume estimated in the order of 150-200 Mm3. In the late summer 2016, an unusual acceleration of the Moosfluh rockslide was observed. Compared to previous years, when ground deformations were in the order of few centimeters, in the period September-October 2016 maximum velocities have reached locally 1 m/day. Such a critical evolution resulted in an increased number of local rock failures and caused the generation of several deep tensile cracks, hindering the access to hiking paths visited by tourists. Moreover, surface deformations have also affected the Moosfluh cable car station, located near the crest of the unstable slope. In this critical framework, the information available on ground was not enough to disentangle the spatial extent of the most active region. To investigate that, we have processed a number of Sentinel-1 SAR images acquired over the GAR. We paired images with maximum temporal baseline spanning 12 and 24 days, in order to preserve the highest possible interferometric coherence over the target area. Secondly, by stacking surface displacements obtained from the differential interferograms, we have increased the signal-to-noise ratio to produce velocity maps of the Moosfluh landslide over the period of interest. This approach has allowed us to constrain the lateral borders

  16. AL:PE Acidification of mountain lakes: Palaeolimnology and Ecology. Part 2. - Extention. Final report to the Norwegian Research Council; AL:PE Acidification of mountain lakes: palaeolimnology and ecology. Part 2 - Utvidelse. Sluttrapport til Norges forskningsraad

    Energy Technology Data Exchange (ETDEWEB)

    Wathne, B.M.; Rosseland, B.O.; Lien, L.

    1996-09-01

    Alpine and arctic regions, the least affected areas of Europe, are threatened by acid precipitation and long-range pollution. The international project discussed in this report was started to assess the conditions for alpine or arctic lakes, chemically and biologically combined with analyses of sediment cores. The work was done on lakes of various degrees of acidification and the results may be used to evaluate how fast the environment is changing, in what direction, and biological effects. The AL:PE project is the first comprehensive study of alpine lakes on a European level. The project was financed through EU`s research programme combined with funds from the participating countries. The project, which is now finally ending after 5 years of activity, is briefly surveyed in the report. One of the conclusions is that contamination from long-range pollutants can be found in even the most outlying places. 58 refs., 106 figs., 58 tabs.

  17. The 21st century climate of the Alps: What can we learn from the latest generation of regional climate scenarios?

    Science.gov (United States)

    Kotlarski, Sven; Gobiet, Andreas; Frei, Prisco; Rajczak, Jan; Liniger, Mark A.

    2017-04-01

    The European Alps are a hot spot of climate change and related impacts. Due to their physiographic complexity and their location between distinct climatic zones, climate change and climate impact assessments in this region are challenging and often associated with substantial uncertainties. In particular, previous studies have highlighted the added value of high-resolution regional climate models (RCMs) to capture fine scale spatio-temporal Alpine climate variability and to assess climate change impacts for high elevation regions. We here exploit state-of-the-art regional climate scenarios available through the CORDEX initiative to assess 21st century climate change over the European Alps. The analyzed model ensemble consists of both high (12 km) and low resolution (50 km) experiments carried out by multiple RCMs which are, in turn, driven by multiple global climate models. Obvious RCM deficiencies in the Alpine area are identified. For instance, several RCMs tend to constantly accumulate snow cover at some isolated grid cells resulting in a distortion of the temperature change signal. Our analysis considers two different emission scenarios (RCP4.5 and RCP8.5). Besides seasonal mean changes in temperature and precipitation we particularly focus on changes in precipitation and temperature extremes as well as changes in parameters related to snow cover and snowfall. A dedicated spatial analysis combined with the assessment of elevation dependencies of climate change signals identifies regional hot spots of change. Robust and reliable aspects of projected climate change in the Alps are highlighted, and more uncertain but nevertheless important possible further changes are discussed in addition. The results largely confirm the findings of previous studies based on the ENSEMBLES experiments, but also yield a number of new insights. The projected increase of winter precipitation, for instance, appears to be stronger and more robust than previously known while potential

  18. Influences of Climate Warming and Facility Management on Continuous Permafrost at Matterhorn Glacier Paradise, Zermatt, Swiss Alps.

    Science.gov (United States)

    King, Lorenz; Duishonakunov, Murataly; Imbery, Stephan

    2014-05-01

    In many parts of the Alps, hazardous bedrock instabilities occur more often during the past 30 years. In many cases, permafrost degradation played a central role for instability (e.g. in 1987 the Val Pola rockslide, Italy). At other events, the role of permafrost degradation is more complex or unpredictable (e.g. in 1991 the Randa rockfall, Wallis, Swiss Alps). However, instabilities in perennially frozen bedrock may also be provoked by human influence. This is exemplarily shown at touristic facilities in the Alps. Human impact on permafrost is often underestimated, or even carelessly taken into account. The tourist resort Zermatt with more than 1.8 million overnight stays per year is located at 1600 m a.s.l. and is surrounded by high mountain ranges that often reach above 4000 m. The dry and sunny climate results in a high glacier equilibrium line thus leaving space for vast non-glaciated permafrost terrain. Numerous tourist facilities provide excellent logistics and easy access to permafrost sites, and the region is thus especially suitable for permafrost research. The infrastructure erected on permafrost consists of hotels, restaurants and mountain huts, station buildings of railways, funiculars, ski lifts and installations for artificial snowing the ski-runs. Some problems at these constructions due to permafrost degradation are shown. At the Matterhorn Glacier Paradise station at an altitude of 3820 meters, todays MAAT ranges between -6 °C and -8°C. During the construction of a tunnel in 1981 bedrock temperatures were at -12°C. Over the past 30 years, these bedrock temperatures have risen to -3 to -2°C, due to the heat brought into the tunnel by facilities and more than 490,000 visitors per year. In an elevator shaft, the temperature temporarily even rose above freezing point. Several new construction sites in continuous permafrost are described and new research data is presented. Another interesting site for permafrost and ice studies at Matterhorn

  19. A hypocystal archeopyle in a freshwater dinoflagellate from the Peridinium umbonatum group (Dinophyceae) from Lake Nero di Cornisello, South Eastern Alps, Italy

    DEFF Research Database (Denmark)

    Tardio, Massimiliano; Ellegaard, Marianne; Lundholm, Nina

    2009-01-01

    Cornisello, a low-alkalinity high mountain lake of the Adamello mountain range (2233m above sea level, South Eastern Alps, Italy). The archeopyle is large, clearly hypocystal, polygonal, and slightly peanut-shaped. The species producing this cyst belongs to the Peridinium umbonatum group and is described...

  20. Modern diatom, cladocera, chironomid, and chrysophyte cyst assemblages as quantitative indicators for the reconstruction of past environmental conditions in the Alps. II. Nutrients

    NARCIS (Netherlands)

    Lotter, A.F.; Birks, H.J.B.; Hofmann, W.; Marchetto, A.

    1998-01-01

    Surface sediments from 68 small lakes in the Alps and 9 welldated sediment core samples that cover a gradient of total phosphorus (TP) concentrations of 6 to 520 ug TP l-1 were studied for diatom, chrysophyte cyst, cladocera, and chironomid assemblages. Inferencemodels for mean circulation log10

  1. Zwischen Wildnis und Freizeitpark: Eine Streitschrift zur Zukunft der Alpen [Between Wilderness and Leisure Park: A Pamphlet on the Future of the Alps

    Directory of Open Access Journals (Sweden)

    Dominik Siegrist

    2016-02-01

    Full Text Available Reviewed: Zwischen Wildnis und Freizeitpark: Eine Streitschrift zur Zukunft der Alpen [Between Wilderness and Leisure Park: A Pamphlet on the Future of the Alps] By Werner Bätzing. Zurich, Switzerland: Rotpunktverlag, 2015. 145 pp. € 9.90. ISBN 978-3-85869-648-9.

  2. Carex sempervirens tussocks induce spatial heterogeneity in litter decomposition, but not in soil properties, in a subalpine grassland in the Central Alps

    Science.gov (United States)

    Fei-Hai Yu; Martin Schutz; Deborah S. Page-Dumroese; Bertil O. Krusi; Jakob Schneller; Otto Wildi; Anita C. Risch

    2011-01-01

    Tussocks of graminoids can induce spatial heterogeneity in soil properties in dry areas with discontinuous vegetation cover, but little is known about the situation in areas with continuous vegetation and no study has tested whether tussocks can induce spatial heterogeneity in litter decomposition. In a subalpine grassland in the Central Alps where vegetation cover is...

  3. Evolution of organic and inorganic components of aerosol during a Saharan dust episode observed in the French Alps

    Directory of Open Access Journals (Sweden)

    G. Aymoz

    2004-01-01

    Full Text Available A Saharan dust event was observed in a rural area in the Maurienne Valley (French Alps in summer 2000. Detailed data on PM10, particle numbers, and aerosol chemistry (ionic species and Elemental Carbon (EC and Organic Carbon (OC are presented. The comparative evolutions of particle numbers and chemistry (calcium, sodium, and sulfate show that the overall period included two episodes of dust particles with very distinct chemistry, followed by an episode with a large increase of the concentrations of species with an anthropogenic origin. The overall data set does not indicate large interactions between the dust particles and compounds from anthropogenic origin (sulfate, nitrate or with organic carbon, all of these species showing very low concentrations. Simplistic calculations indicate that these concentrations are consistent with our current knowledge of adsorption processes of gases on mineral dust in a clean air mass.

  4. Pressure effects on the elastic and lattice dynamics properties of AlP from first-principles calculations

    Energy Technology Data Exchange (ETDEWEB)

    Lakel, S., E-mail: s.lakel@yahoo.fr [Laboratory of physical materials - University of LAGHOUAT – BP 37G, Laghouat (Algeria); Laboratoire de Matériaux Semi Conducteurs et Métalliques «LMSM», Université de Biskra (Algeria); Okbi, F. [Laboratoire de Sciences Fondamentales, Université Amar Telidji de Laghouat, BP 37G, Laghouat 03000 (Algeria); Ibrir, M. [Laboratoire de Sciences Fondamentales, Université Amar Telidji de Laghouat, BP 37G, Laghouat 03000 (Algeria); Département de physique, Université de M' sila (Algeria); Almi, K. [Laboratoire de Matériaux Semi Conducteurs et Métalliques «LMSM», Université de Biskra (Algeria)

    2015-03-30

    We have performed first-principles calculations to investigate the behavior under hydrostatic pressure of the structural, elastic and lattice dynamics properties of aluminum phosphide crystal (AlP), in both zinc-blende (B3) and nickel arsenide (B8) phases. Our calculated structural and electronic properties are in good agreement with previous theoretical and experimental results. The elastic constants, bulk modulus (B), shear modulus (G), and Young's modulus (E), Born effective charge and static dielectric constant ε{sub 0}, were calculated with the generalized gradient approximations and the density functional perturbation theory (DFPT). Our results in the pressure behavior of the elastic and dielectric properties of both phases are compared and contrasted with the common III–V materials. The Born effective charge ZB decreases linearly with pressure increasing, while the static dielectric constant decreases quadratically with the increase of pressure.

  5. Structural data, geomorphology and rock slides in the SW of Barles (The Alps of Northern Provence, France)

    Energy Technology Data Exchange (ETDEWEB)

    Bureau, D.

    2016-10-01

    The Alps of northern Provence in France is a familiar area to European geologists because numerous, long field studies have been organized by European universities and private petroleum companies during the 20th century and the beginning of the 21st century. Nevertheless, geologists have made few comments on the consequences of some topographic slides and, more broadly, on the manner by which nature has sculpted the local geomorphology. After having set the local tectonic data (the thrust of the Blayeul Massif on an already folded para-autochtonous formation and locally up and down reversals in the area of the Heights of Chine and Proussier), a geological and geomorphological summary introduces a discussion on slides and slope formations; then the details of the morphology analysis lead us to the conclusions. (Author)

  6. The acquisition and supervision system of S.A.R.A.'s (Accelerator system Rhone-Alpes) parameters

    International Nuclear Information System (INIS)

    Iazzourene, F.

    1982-01-01

    The acquisition and supervision system of SARA's (Systeme Accelerateur Rhone-Alpes) parameters is built up. The basic hardware consists of: - A PDP 11/10 computer with a 64 K bytes memory capacity. The system and load device is a floppy disk of 28 megabytes capacity. - A CAMAC crate including a data logger with 224 input channels, a terminal driver (JTY21) and three modules designed for reading out a few digital data, for instance polarities of power supplies. The software provides three distinct programs: AKITS, which uses 3 commands, detects and signals functioning defects in the CAMAC modules used. AKIDO which uses 11 commands, is the acquisition and organization program of the accelerator's functioning parameters. AKISUR is the supervision program of the functioning parameter's stability, within a fixed gap, during the accelerator running [fr

  7. Long-term air monitoring of organochlorine pesticides using Semi Permeable Membrane Devices (SPMDs) in the Alps.

    Science.gov (United States)

    Levy, W; Henkelmann, B; Pfister, G; Bernhöft, S; Kirchner, M; Jakobi, G; Bassan, R; Kräuchi, N; Schramm, K-W

    2009-12-01

    Atmospheric sampling of organochlorine pesticides (OCPs) was conducted using Semi Permeable Membrane Devices (SPMDs) deployed in the Alps at different altitudinal transects for two consecutive exposure periods of half a year and a third simultaneous year-long period. Along all the altitude profiles, the sequestered amounts of OCPs increased in general with altitude. SPMDs were still working as kinetic samplers after half a year for the majority of the OCPs. However, compounds with the lowest octanol-air partition coefficient (K(oa)), reached equilibrium within six months. This change in the SPMD uptake was determined for the temperature gradient along the altitude profile influencing K(oa), OCPs availability in the gaseous phase, and SPMD performance. In sum, it seems two effects are working in parallel along the altitude profiles: the change in SPMD performance and the different availability of OCPs along the altitudinal transects determined by their compound properties and concentrations in air.

  8. On-line Monitoring of VOCs at a High Mountain Site in the German Alps (Schneefernerhaus, Zugspitze)

    Science.gov (United States)

    Simmer, G.; Grabmer, W.; Wisthaler, A.; Graus, M.; Hansel, A.

    2003-12-01

    In the frame of the Schneefernerhaus Aerosol & Reactive Nitrogen Experiment (SCAVEX) a Proton-Transfer-Reaction Mass Spectrometer was installed on the Environmental Research Station Schneefernerhaus (47.42° N, 10.99° E, 2650 m a.s.l.). The Schneefernerhaus is situated about 300 m below the peak of the Zugspitze in the German Alps. From 28th October 2002 to 12th March 2003 the remotely operated PTR-MS instrument measured a series of volatile organic compounds (VOCs) including oxygenates (methanol, acetaldehyde, acetone, methyl ethyl ketone), aromatics (benzene, toluene, alkyl substituted benzenes) and the biomass burning tracer acetonitrile. PTR-MS measurements on high mountain sites can be used to identify air masses with very different chemical characteristics, which have originated in the planetary boundary layer or have undergone long-range transport in the free troposphere. First results will be presented in this paper.

  9. Consistent earthquake catalog derived from changing network configurations: Application to the Rawil Depression in the southwestern Helvetic Alps

    Science.gov (United States)

    Lee, Timothy; Diehl, Tobias; Kissling, Edi; Wiemer, Stefan

    2017-04-01

    Earthquake catalogs derived from several decades of observations are often biased by network geometries, location procedures, and data quality changing with time. To study the long-term spatio-temporal behavior of seismogenic fault zones at high-resolution, a consistent homogenization and improvement of earthquake catalogs is required. Assuming that data quality and network density generally improves with time, procedures are needed, which use the best available data to homogeneously solve the coupled hypocenter - velocity structure problem and can be as well applied to earlier network configurations in the same region. A common approach to uniformly relocate earthquake catalogs is the calculation of a so-called "minimum 1D" model, which is derived from the simultaneous inversion for hypocenters and 1D velocity structure, including station specific delay-time corrections. In this work, we will present strategies using the principles of the "minimum 1D" model to consistently relocate hypocenters recorded by the Swiss Seismological Service (SED) in the Swiss Alps over a period of 17 years in a region, which is characterized by significant changes in network configurations. The target region of this study is the Rawil depression, which is located between the Aar and Mont Blanc massifs in southwestern Switzerland. The Rhone-Simplon Fault is located to the south of the Rawil depression and is considered as a dextral strike-slip fault representing the dominant tectonic boundary between Helvetic nappes to the north and Penninic nappes to the south. Current strike-slip earthquakes, however, occur predominantly in a narrow, east-west striking cluster located in the Rawil depression north of the Rhone-Simplon Fault. Recent earthquake swarms near Sion and Sierre in 2011 and 2016, on the other hand, indicate seismically active dextral faults close to the Rhone valley. The region north and south of the Rhone-Simplon Fault is one of the most seismically active regions in

  10. Characterization Of Industrial And Background Aerosols In The RhÔne-alpes Region Using Laser Remote Sensing Device.

    Science.gov (United States)

    Geffroy, S.; Rairoux, P.; Mondelain, D.; Boutou, V.; Wolf, J.-P.; Frejafon, E.

    Lack of reliable database on aerosol emission and dispersion is one of the main rea- sons for the incertitude of the impact of aerosol on the climate change. International statements and policies requested improvement on the global and on the regional scale. This new project is related to the characterisation of the spatial and time distribution of the aerosols in the Rhône-Alpes region. Actually, aerosols monitoring is mainly performed at ground level in this region and only few studies have been performed on the 3D distribution of urban aerosols (soot) using remote sensing laser device. The Rhône-Alpes region is representative for the regional impact of industry and traffic emission and also for the long-range transport of pollution over the East part of the Alps. The environmental situation of the region in term of sources and localization is especially dominated by: heavy traffic with several motorways (A6 from Paris, A7 to Marseille - both downtown - and A43 to the Alps and Italy) and industrial pollu- tion in particular for Lyon (refinery and several chemistry plants) and Saint Etienne agglomerations, which have a direct impact on the local air quality and also on the regional and national scale. Characterization of the aerosol load and dispersion in this region will be achieved applying two schemes. The first one will be related to the 3D quantitative characterization of diffuse aerosol emission in the industrial areas. Mon- itoring will be performed using a UV-infrared lidar remote sensing device. Emission cadastre elaboration and microphysical characterisation of the emission will be estab- lished. Direct access to several aerosol distribution modes will be used to describe the aerosol population dynamic: sedimentation, transport and aggregation. Studies on the direct impact of the emission on the region will be achieved coupling the 3D and ground level monitoring with dispersion model. The second scheme will be related to the long term remote sensing of

  11. Resonant laser power build-up in ALPS. A 'light-shining-through-walls' experiment

    Energy Technology Data Exchange (ETDEWEB)

    Ehret, Klaus; Ghazaryan, Samvel [Deutsches Elektronen-Synchrotron DESY, Hamburg (Germany); Frede, Maik [Laser Zentrum Hannover e.V. (DE)] (and others)

    2009-05-15

    The ALPS collaboration runs a light-shining-through-walls (LSW) experiment to search for photon oscillations into weakly interacting sub-eV particles (WISPs) inside of a superconducting HERA dipole magnet at the site of DESY. In this paper we report on the first successful integration of a large-scale optical cavity to boost the available power for WISP production in this type of experiments. The key elements are a frequency tunable narrow line-width continuous wave laser acting as the primary light source and an electronic feed-back control loop to stabilize the power build-up. We describe and characterize our apparatus and demonstrate the data analysis procedures on the basis of a brief exemplary run. (orig.)

  12. Ophiolitic detritus in Kimmeridgian resedimented limestones and its provenance from an eroded obducted ophiolitic nappe stack south of the Northern Calcareous Alps (Austria

    Directory of Open Access Journals (Sweden)

    Gawlick Hans-Jürgen

    2015-12-01

    Full Text Available The causes for the Middle to Late Jurassic tectonic processes in the Northern Calcareous Alps are still controversially discussed. There are several contrasting models for these processes, formerly designated “Jurassic gravitational tectonics”. Whereas in the Dinarides or the Western Carpathians Jurassic ophiolite obduction and a Jurassic mountain building process with nappe thrusting is widely accepted, equivalent processes are still questioned for the Eastern Alps. For the Northern Calcareous Alps, an Early Cretaceous nappe thrusting process is widely favoured instead of a Jurassic one, obviously all other Jurassic features are nearly identical in the Northern Calcareous Alps, the Western Carpathians and the Dinarides. In contrast, the Jurassic basin evolutionary processes, as best documented in the Northern Calcareous Alps, were in recent times adopted to explain the Jurassic tectonic processes in the Carpathians and Dinarides. Whereas in the Western Carpathians Neotethys oceanic material is incorporated in the mélanges and in the Dinarides huge ophiolite nappes are preserved above the Jurassic basin fills and mélanges, Jurassic ophiolites or ophiolitic remains are not clearly documented in the Northern Calcareous Alps. Here we present chrome spinel analyses of ophiolitic detritic material from Kimmeridgian allodapic limestones in the central Northern Calcareous Alps. The Kimmeridgian age is proven by the occurrence of the benthic foraminifera Protopeneroplis striata and Labyrinthina mirabilis, the dasycladalean algae Salpingoporella pygmea, and the alga incertae sedis Pseudolithocodium carpathicum. From the geochemical composition the analysed spinels are pleonastes and show a dominance of Al-chromites (Fe3+–Cr3+–Al3+ diagram. In the Mg/(Mg+ Fe2+ vs. Cr/(Cr+ Al diagram they can be classified as type II ophiolites and in the TiO2 vs. Al2O3 diagram they plot into the SSZ peridotite field. All together this points to a harzburgite

  13. Verification of structural control on landforms in the transition zone between Pannonian Basin and Eastern Alps

    Science.gov (United States)

    Kovács, Gábor; Fodor, László; Kövér, Szilvia; Molnár, Gábor; Székely, Balázs; Timár, Gábor; Telbisz, Tamás

    2013-04-01

    partly follow this line of combined methodology, but use different subsurface and surface data sets. The success of the study of Ruszkiczay-Rüdiger et al. (2009) mainly depended on the availability of industrial seismic profiles. However, this is not the case in the presented study area. Instead of seismic data, we used other types of geophysical methods, namely 2D geoelectric tomography, 1D vertical electric sounding. Relatively dense network of shallow boreholes permitted the construction of cross sections and could be compared to geophysical data. Finally, surface fault-slip data was important for characterisation of fault geometry and fault kinematics. All these data permitted to build a 3D model for a particular drainage anomaly located in the western Pannonian Basin, its transition to the Eastern Alps. The combined data set suggest that en echelon normal or oblique-normal faults controlled linear ENE trending segments of the Arany creek, which is almost perpendicular to the general flow direction. The en echelon faults could be part of a sinistral shear zone, which occur between the Rechnitz and Eisenberg windows of the Penninicum. If this fault was kinematically connected to others at the window's margin, their tectonic exhumation might have continued after the main early to mid-Miocene phase. The fault zone could be initiated in the late Miocene (Pannonian) around 9 Ma, and was active afterword. Exact timing of this deformation was not determined neither neotectonic activity proved. However, our study shows that the Late Miocene basin fill of the Pannonian Basin was deformed considerably. The other issue of our work is that the combination of diverse methods is useful, sometimes inevitable for checking the potential structural control and landform and landscape evolution. Ruszkiczay-Rüdiger, Z.; Fodor, L. & Horváth, E. 2007: Neotectonic and landscape evolution of the Gödöllő Hills, Central Pannonian Basin. - Global and Planetary Change, 58, 181

  14. A new Geo-Information Architecture for Risk Management in the Alps

    Science.gov (United States)

    Baruffini, Mi.; Thuering, M.

    2009-04-01

    the dangers (natural) and related risks in terms of infrastructure vulnerability. The application considers different types of danger (logically intersected with the transport infrastructure) and compares them with fixed values to obtain a so-called deficit. As framework we adopt The Swiss system for risk analysis of gravitational natural hazards (BUWAL 1999). In this way the project develops a methodology that makes possible a risk analysis aiming to optimize the infrastructure vulnerability and therefore allows to obtain a model designed to optimize the functionality of the network infrastructure. A simulation environment, RiskBox, is developed within the open-source GIS environment GRASS (Geographic Resources Analysis Support System) and a database (PostgreSQL) in order to manage a infrastructure data catalog. The targeted simulation environment includes the elements that identify the consecutive steps of risk analysis: hazard - vulnerability - risk. The initial results of the experimental case study show how useful a GIS-based system, which identify the risk of any single vulnerable element in the corridor and to assess the risk to the global system on the basis of priorities of the actors involved, can be for effective and efficient disaster response management, as explained in (ARMONIA Project 2007). In our work we wanted to highlight the complexity of the risk analysis methodology, difficulty that is amplified by many peculiarities in the mountain areas. In particular, the illustrative performed process can give an overview of the interests and the need to act to reduce vulnerability and the hazardous nature of the Gotthard corridor. We present the concept and current state of development of our project and our application to the testbed, the Alps-crossing corridor of St. Gotthard. REFERENCES ARMONIA Project 2007: Land use plans in Risky areas fro Unwise to Wise Practices - Materials 2nd conference. Politecnico di Milano. BUWAL 1999: Risikoanalyse bei

  15. The "green stones" of Valtellina and Valchiavenna (central Alps, northern Italy)

    Science.gov (United States)

    Cavallo, Alessandro

    2015-04-01

    Valtellina and Val Chiavenna (Sondrio, Central Alps, northern Italy) are traditionally areas of production of building and ornamental stones (e.g. Serizzo Ghiandone, Serizzo Valmasino, San Fedelino Granite), and among these the "green stones" have a leading position. These stones had an extensive use in Lombardy, as well as abroad (e.g Switzerland). The "green stones" are related to the two mafic-ultramafic bodies of Valmalenco and Chiavenna, where the two largest quarrying districts of the Province of Sondrio are located. Until the early decades of the XX century, serpentinites (and other lithologies from Valtellina) were also extracted from the erratic boulders of Brianza (north of Milan), but at present time the law protects the few remaining boulders. The extracted and processed materials are various: serpentinites, ophicalcites, soapstones. Even the "Stone of Tresivio", used in the past in important monuments of Valtellina, could be classified among the "green stones" in a broad sense: it is a green chloritic schist with scarce and thin ferriferous calcitic veins, pertaining to the sedimentary "Servino" Formation. In recent times, the ancient quarries of this stone were rediscovered near the homonymous village, a few kilometers from Sondrio. There are also historic reports about other "green stones", used in ancient times, such as the "Stone of Grosio", a chloritic schist, and the "Bormio Prasinite". Currently the extraction and processing of "green stones" occurs mostly in Valmalenco, with 22 active serpentinite quarries and a gross volume of 70000 m3 extracted per year, with a yield of about 50%. The Malenco serpentinite (interpreted as sub-continental mantle rocks) forms a 1-2 km thick tabular body, outcropping over an area of about 170 km2, almost entirely confined within the boundaries of the valley. The antigoritic serpentinites (with variable amounts of olivine, clinopyroxene, chlorite and magnetite) are moderately up to strongly foliated, sometimes

  16. Comparing data of terrestrial LiDAR and UAV (photogrammetric) in the context of the project "SedAlp"

    Science.gov (United States)

    Abel, Judith; Wegner, Kerstin; Haas, Florian; Heckmann, Tobias; Becht, Michael

    2014-05-01

    The project "SedAlp" (Sediment management in Alpine basins: integrating sediment continuum, risk mitigation and hydropower) concentrates on problems and approaches related to sediment transfer in the alpine region and is embedded in the European transnational cooperation program "Alpine Space". The catholic University Eichstätt-Ingolstadt contributes the German part to this project on behalf of the Bavarian Environment Agency and in collaboration with the Authority of Water Resources Weilheim. The area of interest is the river Isar between the Sylvenstein reservoir and the city of Bad Tölz, Bavaria, Germany. The main aim of the activities is to quantify the transfer of sediments from the tributary catchments to the river Isar, specifically in light of the fact that the construction of the Sylvenstein reservoir in the mid 1950ies has created a barrier to longitudinal sediment transfer, thus heavily impacting the sediment budget and morphodynamics of the Isar reaches downstream. Moreover, the further development of artificially inserted gravel deposits and the effect of dismantling reinforcement structures at the river banks need investigation. Therefore, the dynamics of alluvial fans and gravel bars in the areas of confluence of tributary torrents are monitored using multitemporal surveys with terrestrial laserscanners and drone-based imagery. The latter is used both for the generation of high-resolution digital elevation models and for the mapping of changes in comparison to historical aerial photos. This study focuses on a comparison of TLS and UAV-based photogrammetric digital elevation models in order to highlight advantages and disadvantages of the two methods in relation to the SedAlp-specific research problems. It is shown that UAV-based elevation models are highly accurate alternatives to TLS-based models; due to their favourable acquisition geometry with respect to the topography in floodplain areas, and their large areal coverage, their use is seen as

  17. Combined Genotypic, Phylogenetic, and Epidemiologic Analyses of Mycobacterium tuberculosis Genetic Diversity in the Rhône Alpes Region, France.

    Science.gov (United States)

    Pichat, Catherine; Couvin, David; Carret, Gérard; Frédénucci, Isabelle; Jacomo, Véronique; Carricajo, Anne; Boisset, Sandrine; Dumitrescu, Oana; Flandrois, Jean-Pierre; Lina, Gérard; Rastogi, Nalin

    2016-01-01

    The present work relates to identification and a deep molecular characterization of circulating Mycobacterium tuberculosis complex (MTBC) strains in the Rhône-Alpes region, France from 2000 to 2010. It aimed to provide with a first snapshot of MTBC genetic diversity in conjunction with bacterial drug resistance, type of disease and available demographic and epidemiologic characteristics over an eleven-year period, in the south-east of France. Mycobacterium tuberculosis complex (MTBC) strains isolated in the Rhône-Alpes region, France (n = 2257, 1 isolate per patient) between 2000 and 2010 were analyzed by spoligotyping. MIRU-VNTR typing was applied on n = 1698 strains (with full results available for 974 strains). The data obtained were compared with the SITVIT2 database, followed by detailed genotyping, phylogenetic, and epidemiologic analyses in correlation with anonymized data on available demographic, and epidemiologic characteristics, and location of disease (pulmonary or extrapulmonary TB). The most predominant spoligotyping clusters were SIT53/T1 (n = 346, 15.3%) > SIT50/H3 (n = 166, 7.35%) > SIT42/LAM9 (n = 125, 5.5%) > SIT1/Beijing (n = 72, 3.2%) > SIT47/H1 (n = 71, 3.1%). Evolutionary-recent strains belonging to the Principal Genetic Group (PGG) 2/3, or Euro-American lineages (T, LAM, Haarlem, X, S) were predominant and represented 1768 or 78.33% of all isolates. For strains having drug resistance information (n = 1119), any drug resistance accounted for 14.83% cases vs. 1.52% for multidrug resistance (MDR); and was significantly more associated with age group 21-40 years (p-valueFrance over a large time-period. It helps better understand intricate relationships between certain lineages and geographic origin of the patients, and pinpoints genotypic and phylogenetic specificities of prevailing MTBC strains. Lastly, it also demonstrated a slow decline in isolation of M. africanum lineage in this region between 2000 and 2010.

  18. Longer growing seasons and warm summers boost Rhododendron ferrugineum L. growth in the Taillefer massif (French Alps)

    Science.gov (United States)

    Francon, Loïc; Corona, Christophe; Roussel, Erwan; Lopez Saez, Jerome; Stoffel, Markus

    2017-04-01

    Rhododendron ferrugineum L. is an important and widespread dwarf shrub species growing in high-elevation, alpine environments of the Western European Alps. As such, it is likely to offer unique opportunities which would allow pushing current dendrochronological networks into extreme environments and way beyond the upper survival limit of trees. Given that different species of the same genus have been successfully used in tree-ring investigations, notably in the Himalayas where Rhododendron sp. has proven to be a reliable climate proxy, this study aims at (i) evaluating the dendroclimatological potential of the widely distributed R. ferrugineum and at (ii) determining the major limiting climate factor driving species growth and the formation of rings. To this end, 154 cross-sections from 36 R. ferrugineum individuals have been sampled above local treelines and at elevations comprised between 1800 and 2100 m asl on NW-facing slopes of the Taillefer massif (French Alps). We illustrate a 195-year-long standard chronology based on growth-ring records selected from 24 individuals, and document that the series is well-replicated for almost one century (1920-2015) with an Expressed Population Signal (EPS) >0.85. Analysis using partial and seasonal correlation functions further highlight that growth of Rhododendron is governed by temperatures during the growing season (May-July), with increasingly higher air temperatures favoring larger ring widths, a phenomenon which is well known from dwarf shrubs growing in circum-arctic tundra ecosystems. Similarly, the negative effect of January-February precipitation on radial growth of R. ferrugineum, rarely observed in the Arctic, is interpreted as a result of reduced growing seasons following snowy winters. We conclude that the strong and unequivocal signals recorded in the fairly long R. ferrugineum chronologies presented here can indeed be used for climate-growth studies as well as for the reconstruction of climatic fluctuations

  19. Performances of an expanding insect under elevated CO{sub 2} and snow cover in the Alps

    Energy Technology Data Exchange (ETDEWEB)

    Battisti, B.; Petrucco-Toffolo, E. [University of Padova, Legnaro (Italy). Dept. of Environmental Agronomy

    2008-09-30

    Variations of phenology and distribution have been recently highlighted in numerous insect species and attributed to climate change, particularly the increase of temperature and atmospheric carbon dioxide (CO{sub 2}). Both have been shown to have direct and indirect effects on insect species of various ecosystems, though the responses are often species-specific. The pine processionary moth, Thaumetopoea pityocampa (Lepidoptera, Notodontidae) is an important pest of conifers in the Mediterranean region, and has been recently shown to expand its altitudinal range in the Alps, including the mountain pine Pinus mugo as a novel host. We had the opportunity to transplant colonies of the pine processionary moth to a high elevation site well outside of the current range of the insect (Stillberg, Davos, Switzerland, 2180 m), where trees of the mountain pine have been grown for five years under ambient and elevated CO{sub 2} concentrations (ca. 570 ppm). The aim of the study was to evaluate the response of first instar larvae to extreme conditions of temperature and to an altered performance induced by the change of host metabolism under elevated CO{sub 2}. Larval mortality and relative growth rate did not differ between host trees grown in ambient or elevated CO{sub 2}. As extended snow cover may be an important mortality factor of larval colonies on the dwarf trees of mountain pine, we tested the survival of colonies transplanted at two extreme sites of Eastern Alps. The snow cover extended over more than one month proved to be an important mortality factor of larval colonies on mountain pine. We concluded that the first instar larvae of the pine processionary moth are not concerned by unusually low temperature and CO{sub 2} increase whereas they can be later strongly affected by snow accumulation. The decrease of snow cover observed in the last decades, however, may reduce such a risk.

  20. Uncertainty propagation for flood forecasting in the Alps: different views and impacts from MAP D-PHASE

    Directory of Open Access Journals (Sweden)

    M. W. Rotach

    2012-08-01

    Full Text Available D-PHASE was a Forecast Demonstration Project of the World Weather Research Programme (WWRP related to the Mesoscale Alpine Programme (MAP. Its goal was to demonstrate the reliability and quality of operational forecasting of orographically influenced (determined precipitation in the Alps and its consequences on the distribution of run-off characteristics. A special focus was, of course, on heavy-precipitation events.

    The D-PHASE Operations Period (DOP ran from June to November~2007, during which an end-to-end forecasting system was operated covering many individual catchments in the Alps, with their water authorities, civil protection organizations or other end users. The forecasting system's core piece was a Visualization Platform where precipitation and flood warnings from some 30 atmospheric and 7 hydrological models (both deterministic and probabilistic and corresponding model fields were displayed in uniform and comparable formats. Also, meteograms, nowcasting information and end user communication was made available to all the forecasters, users and end users. D-PHASE information was assessed and used by some 50 different groups ranging from atmospheric forecasters to civil protection authorities or water management bodies.

    In the present contribution, D-PHASE is briefly presented along with its outstanding scientific results and, in particular, the lessons learnt with respect to uncertainty propagation. A focus is thereby on the transfer of ensemble prediction information into the hydrological community and its use with respect to other aspects of societal impact. Objective verification of forecast quality is contrasted to subjective quality assessments during the project (end user workshops, questionnaires and some general conclusions concerning forecast demonstration projects are drawn.

  1. Cretaceous to Miocene fault zone evolution in the Eastern Alps constrained by multi-system thermochronometry and structural data.

    Science.gov (United States)

    Wölfler, Andreas; Frisch, Wolfgang; Danišík, Martin; Fritz, Harald; Wölfler, Anke

    2015-04-01

    Fault zones that display both, ductile and brittle deformation stages offer perfect sites to study the evolution of the earth's crust over a wide range of temperatures and possibly over long time spans. This study combines structural- geo- and thermochronologcial data to evaluate the tectonic evolution of a fault zone to the southeast of the Tauern Window in the Eastern Alps. This fault zone comprises a mylonitic part, the so-called "Main Mylonitic Zone" (MMZ) that has been reworked by brittle faulting, the so-called "Ragga-Teuchl fault" (RTF). Structural data of the MMZ demonstrate ductile deformation with top-to-the NW transport in the Late Cretaceous under greenschist facies conditions. Subsequent SE-directed extension occurred under semi-brittle to brittle conditions during the Late Cretaceous and Paleocene. The Polinik Block to the north of the RTF revealed Late Cretaceous Ar/Ar ages, which reflect cooling subsequent to the thermal peak of Eo-alpine metamorphism. In contrast, the Kreuzeck Block to the south of the RTF shows early Permian Ar/Ar ages that reflect cooling related to both, late Variscan collapse in the late Carboniferous and post-Variscan extension in the Permian. Zircon and apatite fission track ages and thermal history modeling results suggest that the Polinik Block cooled rapidly to near surface temperatures in the middle Miocene. The Kreuzeck Block, in contrast, cooled and exhumed to near surface conditions already in the Oligocene and early Miocene. Thermal history modeling and apatite fission track ages of 23.3±0.8 and 11.5±1.0 suggest that brittle deformation along the RTF occurred in the middle- and late Miocene. Our results demonstrate that one single fault zone may comprise information about the evolution of the Eastern Alps from Late Cretaceous to Miocene time and that low-temperature thermochronology is a viable tool to resolve the timing of brittle faulting and accompanied fluid activity.

  2. Soil warming increased whole-tree water use of Pinus cembra at the treeline in the Central Tyrolean Alps.

    Science.gov (United States)

    Wieser, Gerhard; Grams, Thorsten E E; Matyssek, Rainer; Oberhuber, Walter; Gruber, Andreas

    2015-03-01

    This study quantified the effect of soil warming on sap flow density (Qs) of Pinus cembra L. at the treeline in the Central Tyrolean Alps. To enhance soil temperature we installed a transparent roof construction above the forest floor around six trees. Six other trees served as controls in the absence of any manipulation. Roofing enhanced growing season mean soil temperature by 1.6, 1.3 and 1.0 °C at 5, 10 and 20 cm soil depth, respectively, while soil water availability was not affected. Sap flow density (using Granier-type thermal dissipation probes) and environmental parameters were monitored throughout three growing seasons. During the first year of treatment, no warming effect was detected on Qs. However, soil warming caused Qs to increase significantly by 11 and 19% above levels in control trees during the second and third year, respectively. This effect appeared to result from warming-induced root production, a reduction in viscosity and perhaps an increase also in root hydraulic conductivity. Hardly affected were leaf-level net CO2 uptake rate and conductance for water vapour, so that water-use efficiency stayed unchanged as confirmed by needle δ(13)C analysis. We conclude that tree water loss will increase with soil warming, which may alter the water balance within the treeline ecotone of the Central Austrian Alps in a future warming environment. © The Author 2015. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  3. Evaluation of convection-resolving models using satellite data: The diurnal cycle of summer convection over the Alps

    Directory of Open Access Journals (Sweden)

    Michael Keller

    2016-05-01

    Full Text Available Diurnal moist convection is an important element of summer precipitation over Central Europe and the Alps. It is poorly represented in models using parameterized convection. In this study, we investigate the diurnal cycle of convection during 11 days in June 2007 using the COSMO model. The numerical simulations are compared with satellite measurements of GERB and SEVIRI, AVHRR satellite-based cloud properties and ground-based precipitation and temperature measurements. The simulations use horizontal resolutions of 12 km (convection-parameterizing model, CPM and 2 km (convection-resolving model, CRM and either a one-moment microphysics scheme (1M or a two-moment microphysics scheme (2M.They are conducted for a computational domain that covers an extended Alpine area from Northern Italy to Northern Germany. The CPM with 1M exhibits a significant overestimation of high cloud cover. This results in a compensation effect in the top of the atmosphere energy budget due to an underestimation of outgoing longwave radiation (OLR and an overestimation of reflected solar radiation (RSR. The CRM reduces high cloud cover and improves the OLR bias from a domain mean of −20.1 to −2.6 W/m2. When using 2M with ice sedimentation in the CRM, high cloud cover is further reduced. The stronger diurnal cycle of high cloud cover and associated convection over the Alps, compared to less mountainous regions, is well represented by the CRM but underestimated by the CPM. Despite substantial differences in high cloud cover, the use of a 2M has no significant impact on the diurnal cycle of precipitation. Furthermore, a negative mid-level cloud bias is found for all simulations.

  4. Modelling technical snow production for skiing areas in the Austrian Alps with the physically based snow model AMUNDSEN

    Science.gov (United States)

    Hanzer, F.; Marke, T.; Steiger, R.; Strasser, U.

    2012-04-01

    Tourism and particularly winter tourism is a key factor for the Austrian economy. Judging from currently available climate simulations, the Austrian Alps show a particularly high vulnerability to climatic changes. To reduce the exposure of ski areas towards changes in natural snow conditions as well as to generally enhance snow conditions at skiing sites, technical snowmaking is widely utilized across Austrian ski areas. While such measures result in better snow conditions at the skiing sites and are important for the local skiing industry, its economic efficiency has also to be taken into account. The current work emerges from the project CC-Snow II, where improved future climate scenario simulations are used to determine future natural and artificial snow conditions and their effects on tourism and economy in the Austrian Alps. In a first step, a simple technical snowmaking approach is incorporated into the process based snow model AMUNDSEN, which operates at a spatial resolution of 10-50 m and a temporal resolution of 1-3 hours. Locations of skiing slopes within a ski area in Styria, Austria, were digitized and imported into the model environment. During a predefined time frame in the beginning of the ski season, the model produces a maximum possible amount of technical snow and distributes the associated snow on the slopes, whereas afterwards, until to the end of the ski season, the model tries to maintain a certain snow depth threshold value on the slopes. Due to only few required input parameters, this approach is easily transferable to other ski areas. In our poster contribution, we present first results of this snowmaking approach and give an overview of the data and methodology applied. In a further step in CC-Snow, this simple bulk approach will be extended to consider actual snow cannon locations and technical specifications, which will allow a more detailed description of technical snow production as well as cannon-based recordings of water and energy

  5. Declining effect of warm temperature on spring phenology of tree species at low elevation in the Alps

    Science.gov (United States)

    Asse, Daphné; Randin, Christophe; Chuine, Isabelle

    2017-04-01

    Mountain regions are particularly exposed to climate change and temperature. In the Alps increased twice faster than in the northern hemisphere during the 20th century. As an immediate response, spring phenological phases of plant species such as budburst and flowering, have tended to occur earlier. In 2004, the CREA (Centre de Recherches sur les Ecosystèmes d'Altitude, Chamonix, France) initiated the citizen science program Phenoclim, which aims at assessing the long-term effects of climate changes on plant phenology over the entire French Alps. Sixty sites with phenological observations were equipped with temperature stations across a large elevational gradient. Here we used phenological records for five tree species (birch, ash, hazel, spruce and larch) combined with measurements or projections of temperature. We first tested the effects of geographic and topo-climatic factors on the timing of spring phenological phases. We then tested the hypothesis that a lack of chilling temperature during winter delayed dormancy release and subsequently spring phenological phases. Our data are currently being used to calibrate process-based phenological models to test to which extent soil temperature and photoperiod affect the timing of spring phenological phases. We found that growing degree-days was the best predictor of the timing of spring phenological phases, with a significant contribution of chilling. Our results also suggest that spring phenological phases were consistently delayed at low elevation by a lack of chilling in fall during warm years for the three deciduous species. Key words: Spring phenology, elevation gradients, citizen science, empirical and process-based modeling

  6. High-resolution multitemporal measurement of rockglacier dynamics and periglacial sediment storage in the eastern Alps, Austria

    Science.gov (United States)

    Dusik, Jana-Marie; Haas, Florian; Heckmann, Tobias; Hilger, Ludwig; Neugirg, Fabian; Leopold, Matthias; Becht, Michael

    2013-04-01

    High alpine environments are subject to rapid change due to melting glaciers and permafrost. As a consequence, rockwalls and moraines experience destabilization and increased mobilization of sediment. The work presented here is part of the joint project PROSA (High-resolution measurements of morphodynamics in rapidly changing PROglacial Systems of the Alps) which deals with the calculation and quantification of the sediment budget for an alpine catchment situated in the Kaunertal, Austrian Alps. Rockglaciers are frequently appearing landforms in the Kaunertal and represent large sediment storages. Usually the sediment flux of rockglaciers is rather small, depending on their activity status. All activity forms of rockglaciers (active, inactive and relict) are present in the catchment area. Besides the highly active and well-known Ölgrube rockglacier, this work deals especially with the examination of the Riffeltal rockglacier which is situated on the opposite valley side. The activity status of the Riffeltal rockglacier is assessed and compared to the Ölgrube rockglacier with respect to the local parameters aspect, altitude, existence/absence of glaciers, geology and catchment area. Furthermore sediment volumes of both rockglaciers, their rates of movement and therefore their contribution to the sediment budget of the Kaunertal-catchment area is estimated. The internal structure of the Riffeltal rockglacier was inferred from geophysical measurements (refraction seismics, ground penetrating radar and electrical resistivity tomography). Temperature loggers were placed on and around the rockglacier before the first snowfall to measure the bottom temperature of snowcover (BTS) once per hour during winter, and BTS measurements will be performed with a probe in February, March and April to infer permafrost probability. Rockglacier dynamics are identified with the analysis of multitemporal orthophotos and digital elevation models, derived from high-resolution airborne

  7. MAPK signaling pathway alters expression of midgut ALP and ABCC genes and causes resistance to Bacillus thuringiensis Cry1Ac toxin in diamondback moth.

    Directory of Open Access Journals (Sweden)

    Zhaojiang Guo

    2015-04-01

    Full Text Available Insecticidal crystal toxins derived from the soil bacterium Bacillus thuringiensis (Bt are widely used as biopesticide sprays or expressed in transgenic crops to control insect pests. However, large-scale use of Bt has led to field-evolved resistance in several lepidopteran pests. Resistance to Bt Cry1Ac toxin in the diamondback moth, Plutella xylostella (L., was previously mapped to a multigenic resistance locus (BtR-1. Here, we assembled the 3.15 Mb BtR-1 locus and found high-level resistance to Cry1Ac and Bt biopesticide in four independent P. xylostella strains were all associated with differential expression of a midgut membrane-bound alkaline phosphatase (ALP outside this locus and a suite of ATP-binding cassette transporter subfamily C (ABCC genes inside this locus. The interplay between these resistance genes is controlled by a previously uncharacterized trans-regulatory mechanism via the mitogen-activated protein kinase (MAPK signaling pathway. Molecular, biochemical, and functional analyses have established ALP as a functional Cry1Ac receptor. Phenotypic association experiments revealed that the recessive Cry1Ac resistance was tightly linked to down-regulation of ALP, ABCC2 and ABCC3, whereas it was not linked to up-regulation of ABCC1. Silencing of ABCC2 and ABCC3 in susceptible larvae reduced their susceptibility to Cry1Ac but did not affect the expression of ALP, whereas suppression of MAP4K4, a constitutively transcriptionally-activated MAPK upstream gene within the BtR-1 locus, led to a transient recovery of gene expression thereby restoring the susceptibility in resistant larvae. These results highlight a crucial role for ALP and ABCC genes in field-evolved resistance to Cry1Ac and reveal a novel trans-regulatory signaling mechanism responsible for modulating the expression of these pivotal genes in P. xylostella.

  8. Contrasting cooling and exhumation histories of tectonic blocks in the eastern part of the Eastern Alps and its possible relationships with lithospheric dynamics

    Science.gov (United States)

    Wölfler, Andreas; Glotzbach, Christoph

    2017-04-01

    In the European Alps two fundamental changes in the lithospheric structure controlled the geodynamic evolution of the orogen: (1) Late Eocene to Early Oligocene rupturing of the European slab and (2) Early Miocene change in subduction polarity between the Western and Eastern Alps. In particular, the eastern part of the Eastern Alps is a key area which will provide both, information about the surface response to the Eocene/Oligocene slab breakoff and the response to a proposed isostatic rebound due to slab detachment of the European lithosphere in the Miocene (Handy et al., 2015). The eastern part of the Eastern Alps is characterized by fault-bounded blocks with different thermochronological ages, mean elevations and hillslope angles, indicating a variable spatial and temporal evolution throughout the Cenozoic era. The topographic pattern of the study area can be described in terms of (1) high relief with a rugged surface and steep slopes in the Niedere Tauern and (2) lower relief and distinctly smoother topography in the Seckauer Tauern, the Gurktal, Saualpe and Koralpe blocks. Generally, tectonic blocks with higher relief and rugged topography display the youngest apatite fission track (AFT) and apatite (U-Th)/He data (AHe); the Niedere Tauern concurs with middle Miocene AFT and late Miocene/Pliocene AHe ages (Wölfler et al., 2016). The other tectonic blocks generally show Eocene to Oligocene AFT ages (Wölfler et al., 2016 and references therein) and Oligocene to early Miocene AHe ages (Legrain et al., 2014, own preliminary work). New AFT and AHe data from the Gurktal block and Seckauer Tauern indicate that substantial parts of the study area where at near-surface conditions since the Eocene and Oligocene. Thermal history models suggest fast cooling through the AFT and AHe closure temperatures in the Oligocene as a possible response to slab breakoff that was followed by thermal stagnation until the present. In contrast, the neighboring Niedere Tauern experienced

  9. Application of Powder Diffraction Methods to the Analysis of the Atomic Structure of Nanocrystals: The Concept of the Apparent Lattice Parameter (ALP)

    Science.gov (United States)

    Palosz, B.; Grzanka, E.; Gierlotka, S.; Stelmakh, S.; Pielaszek, R.; Bismayer, U.; Weber, H.-P.; Palosz, W.; Curreri, Peter A. (Technical Monitor)

    2002-01-01

    The applicability of standard methods of elaboration of powder diffraction data for determination of the structure of nano-size crystallites is analysed. Based on our theoretical calculations of powder diffraction data we show, that the assumption of the infinite crystal lattice for nanocrystals smaller than 20 nm in size is not justified. Application of conventional tools developed for elaboration of powder diffraction data, like the Rietveld method, may lead to erroneous interpretation of the experimental results. An alternate evaluation of diffraction data of nanoparticles, based on the so-called 'apparent lattice parameter' (alp) is introduced. We assume a model of nanocrystal having a grain core with well-defined crystal structure, surrounded by a surface shell with the atomic structure similar to that of the core but being under a strain (compressive or tensile). The two structural components, the core and the shell, form essentially a composite crystal with interfering, inseparable diffraction properties. Because the structure of such a nanocrystal is not uniform, it defies the basic definitions of an unambiguous crystallographic phase. Consequently, a set of lattice parameters used for characterization of simple crystal phases is insufficient for a proper description of the complex structure of nanocrystals. We developed a method of evaluation of powder diffraction data of nanocrystals, which refers to a core-shell model and is based on the 'apparent lattice parameter' methodology. For a given diffraction pattem, the alp values are calculated for every individual Bragg reflection. For nanocrystals the alp values depend on the diffraction vector Q. By modeling different a0tomic structures of nanocrystals and calculating theoretically corresponding diffraction patterns using the Debye functions we showed, that alp-Q plots show characteristic shapes which can be used for evaluation of the atomic structure of the core-shell system. We show, that using a simple

  10. Aerosol deposition (trace elements and black carbon) over the highest glacier of the Eastern European Alps during the last centuries

    Science.gov (United States)

    Bertò, Michele; Barbante, Carlo; Gabrieli, Jacopo; Gabrielli, Paolo; Spolaor, Andrea; Dreossi, Giuliano; Laj, Paolo; Zanatta, Marco; Ginot, Patrick; Fain, Xavier

    2016-04-01

    Ice cores are an archive of a wide variety of climatic and environmental information from the past, retaining them for hundreds of thousands of years. Anthropogenic pollutants, trace elements, heavy metals and major ions, are preserved as well providing insights on the past atmospheric circulations and allowing evaluating the human impact on the environment. Several ice cores were drilled in glaciers at mid and low latitudes, as in the European Alps. The first ice cores drilled to bedrock in the Eastern Alps were retrieved during autumn 2011 on the "Alto dell`Ortles glacier", the uppermost glacier of the Ortles massif (3905m, South Tirol, Italy), in the frame of the "Ortles Project". A preliminary dating of the core suggests that it should cover at least 300-400 years. Despite the summer temperature increase of the last decades this glacier still contain cold ice. Indeed, O and H isotopes profiles well describe the atmospheric warming as well as the low temperatures recorded during the Little Ice Age (LIA). Moreover, this glacier is located close to densely populated and industrialized areas and can be used for reconstructing for the first time past and recent air pollution and the human impact in the Eastern European Alps. The innermost part of the core is under analysis by means of a "Continuous Flow Analysis" system. This kind of analysis offers a high resolution in data profiles. The separation between the internal and the external parts of the core avoid any kind of contamination. An aluminum melting head melts the core at about 2.5 cm min-1. Simultaneous analyses of conductivity, dust concentration and size distribution (from 0.8 to 80 μm), trace elements with Inductive Coupled Plasma Mass Spectrometer (ICP-MS, Agilent 7500) and refractory black carbon (rBC) with the Single Particle Soot Photometer (SP2, Droplet Measurement Technologies) are performed. A fraction of the melt water is collected by an auto-sampler for further analysis. The analyzed elements

  11. Reconstruction of glacier fluctuations in the Mont-Blanc massif, western Alps: a multi-­-method approach

    Science.gov (United States)

    Lehmann, Benjamin; Valla, Pierre G.; King, Georgina E.; Ivy-Ochs, Susan; Christl, Marcus; Herman, Frederic

    2017-04-01

    , mineralogical properties and environmental conditions. Premilary OSL results from rock slices show increasing exposure age (i.e., deeper bleaching of the OSL signal) with sample elevation. Moreover, our results reveal that the bleaching of the OSL signal is occuring within the first 1-3 cm below the rock surface, potentially offering high resolution to date the latest exposure following short-lived glacier fluctuations. REFERENCES Coutterand S., Buoncristani J-.-F. (2006), Pal.og.ographie du dernier maximum glaciaire du Pléistocene récent de la région du Massif du Mont Blanc, France, Quaternaire, 17, (1), 2006, p. 35-.-4. Gosse, J.C, and F.M. Phillips (2001). Terrestrial in situ cosmogenic nuclides: theory and application. Quaternary Science Reviews, 20, 1475-1560. Le Roy, M., Nicolussi, K., Deline, P.,Astrade, L., Edouard, J-L., Miramont, C., Arnaud, F. (2015), Calendar dated glacier variations in the western European Alps during the Neoglacial: the Mer de Glace record, Mont Blanc massif, Quaternary Science Review 108 (2015) 1-22, doi:10.1016. Sohbati, R., Murray A., Jain M., Buylaert J.-P., and Thomsen K. (2011), Investigating the resetting of OSL signals in rock surfaces, Geochronometria, 38 (3), 249_258, doi:10.2478/s13386-011-0029-2. Vincent, C., Harter M., Gilbert A., Berthier D., Six D., (2014). Future fluctuations of Mer de Glace, French Alps, assessed using a parameterized model calibrated with past thickness changes. Annals of Glaciology, 55, 15-24. Wirsig C., Zasadni J., Christl M., Akçar N., Ivy-Ochs S. (2016), Dating the onset of LGM ice surface lowering in the High Alps. Quaternary Science Reviews 143 37-50.

  12. Evidence of organic matter in the Ocean-Continent Transition of Alpine Tethys from Totalp, Eastern Swiss Alps

    Science.gov (United States)

    Mateeva, Tsvetomila; Kusznir, Nick; Wolff, George; Wheeler, John; Manatschal, Gianreto

    2015-04-01

    Evidence from ocean ridge drilling and dredging and from the exhumed Tethyan continental margin in the Alps demonstrates that mantle serpentinization occurs at slow-spreading ocean ridges and magma-poor rifted continental margins. Observations at white smokers suggest that methane produced by serpentinization can support methanotrophic bio-systems which use methane as their only source of carbon. An important question is whether such biosystems are more generally pervasive in their association with serpentinized mantle in the subsurface. The answer to this question has important global implications for the importance of the hidden sub-surface bio-systems, the fate of methane and the carbon cycle. We examine whether serpentinized exhumed mantle at magma-poor rifted continental margins shows evidence for methanotrophy. Fieldwork sampling of km scale exposure of orogenically exhumed serpentinized mantle in the eastern Swiss Alps allows 3D mantle sampling not possible at ocean ridges and has the potential to answer the question regarding localized versus pervasive sub-surface methanotrophic biosystems. The Totalp massif in the eastern Swiss Alps has been chosen for an initial study to investigate the presence or absence of methanotrophic biosystem within serpentinized exhumed mantle in the Tethyan OCT. Totalp has little Alpine deformation and its metamorphism is no more than prehnite-pumpellyite grade. Hands specimens and cores have been taken from the Totalp area in order to sample serpentinization and its lithological diversity in the search for presence or absence of biomarkers. Thin sections analysis reveals multiple serpentinization events. XRD analysis shows complete serpentinization of the olivines and orthopyroxenes. The samples for bio-geochemical analysis were cut and ground to powder, processed by soxhlet extraction and then analysed by GC and GCMS in order to determine the full range of biomarkers. Total carbon and total organic carbon was also determined

  13. State of the art on forest and shallow landslide interactions illustrated by two studies in the French Alps

    Science.gov (United States)

    Berger, F.; Dorren, L.; Lopez, J.; Allegra, C.

    2009-04-01

    The importance of mountain forests in the protection from natural hazards such as landslides was perceived already in ancient cultures. Allusions of these interactions can be found in ancient Greek, Hebrew, Roman and Chinese literature. In modern times, quantitative studies on the role of vegetation on slope stability started flourishing during the 1960's, with particular contributions from the USA, USSR and Japan, followed by Brazil, New Zealand, Canada, Sweden and Taiwan in the 1970's and 1980's. Forests influence slope stability though mechanical and hydrological effects. Empirical and scientific knowledge agree on the fact that the main effects of forests stands are considered to be: • Mechanical stabilisation due to the presence of roots • Soil moisture depletion as a result of transpiration and water interception by the canopy • Surcharge from the weight of trees The first two factors are beneficial to slope stability whilst the latter may be beneficial or harmful depending on the slope steepness and the potential failure mode. Roots type and morphology influence the capacity of a tree to stabilise slopes, although the failure surface has to be effectively penetrated by the roots in order to be stabilised. Generally, however, forests are considered beneficial for slope stabilization within the soil depth prospected by the tree's root system. So forest stands, depending on the slope value, the hydrological condition and the soil substrata, could have a positive effect on shallow landslide mitigation. Much of the research in the European Alps, however, focuses on the protection awarded by forests against avalanches and rockfalls, whilst little has been done to quantify their protection against landslides. This is in contrast with other mountain regions in the world (Oregon, Himalaya, Japan, British Columbia), where the relations between forests and landslides has been and continues to be studied throughoutly. In order to develop an efficient shallow

  14. Bacteria at glacier surfaces: microbial community structures in debris covered glaciers and cryoconites in the Italian Alps

    Science.gov (United States)

    Azzoni, Roberto; Franzetti, Andrea; Ambrosini, Roberto; D'Agata, Carlo; Senese, Antonella; Minora, Umberto; Tagliaferri, Ilario; Diolaiuti, Guglielmina

    2014-05-01

    Supraglacial debris has an important role in the glacier energy budget and has strong influence on the glacial ecosystem. Sediment derives generally from rock inputs from nesting rockwalls and are abundant and continuous at the surface of debris-covered glaciers (i.e. DCGs; glaciers where the ablation area is mainly covered by rock debris) and sparse and fine on debris-free glaciers (DFGs). Recently, evidence for significant tongue darkening on retreating debris-free glaciers has been drawing increasing attention. Fine particles, the cryoconite, are locally abundant and may form cryoconite holes that are water-filled depressions on the surface of DFGs that form when a thin layer of cryoconite is heated by the sun and melts the underlying ice. There is increasing evidence that cryoconite holes also host highly diverse microbial communities and can significantly contribute to global carbon cycle. However, there is almost no study on microbial communities of the debris cover of DCGs and there is a lack of data from the temporal evolution of the microbial communities in the cryoconites. To fill these gaps in our knowledge we characterized the supraglacial debris of two Italian DCGs and we investigated the temporal evolution of microbial communities on cryoconite holes in DFG. We used the Illumina technology to analyse the V5 and V6 hypervariable regions of the bacterial 16S rRNA gene amplified from samples collected distances from the terminus of two DCGs (Miage and Belvedere Glaciers - Western Italian Alps). Heterotrophic taxa dominated bacterial communities, whose structure changed during downwards debris transport. Organic carbon of these recently exposed substrates therefore is probably provided more by allochthonous deposition of organic matter than by primary production by autotrophic organisms. We used ARISA fingerprinting and quantitative PCR to describe the structure and the evolution of the microbial communities and to estimate the number of the total

  15. How to stir a revolution as a reluctant rebel: Rudolf Trümpy in the Alps

    Science.gov (United States)

    Şengör, A. M. Celâl; Bernoulli, Daniel

    2011-07-01

    Rudolf Trümpy (1921-2009) was one of the great Alpine geologists of the twentieth century and an influential figure in the international geological community. He played a dominant role in the change of opinion concerning the Alpine evolution by showing that normal faulting dominated the early development of the Alpine realm from the Triassic to the early Cretaceous. This provided a convenient model for later plate-tectonic interpretations of collisional mountain belts. His further recognition of strike-slip faulting during all stages of the Alpine evolution presaged the realisation that the Alps were not built by a simple open-and-shut mechanism. Trümpy was educated during an intellectual lull, a time when simplistic models of the earth behaviour inherited from the middle of the nineteenth century became prevalent under the influence of a close-minded, positivist approach to geological problems. This period, which we term the Dark Intermezzo, lasted from about 1925 to 1965. The grand syntheses of Suess and Argand which preceded this period were viewed from this narrow angle and consequently misunderstood. It was thought that earth history was punctuated by global orogenic events of short duration taking place within and among continents and oceans whose relative positions had remained fixed since the origin of the planet. These views, summarised under the term `fixism', were developed when the ocean floors were almost totally unknown. When data began coming in from the post World War II oceanographic surveys, the world geological community was slow to receive and digest them. Trümpy followed these developments closely, realising that his work was important in placing the geology of the mountain belts within the emerging, new theoretical framework. He adopted the position of a critic and emphasised where detailed knowledge of the Alps, unquestionably the best known mountain belt in the world, supported and where it contradicted the new ideas. His voice was

  16. Climatic extreme events combine with impacts of gradual climate change: recent evidence from the Andes and the Alps

    Science.gov (United States)

    Huggel, Christian; Giráldez, Claudia; Haeberli, Wilfried; Schneider, Demian; Frey, Holger; Schaub, Yvonne; Cochachin, Alejo; Portocarrero, Cesar; García, Javier; Guillén Ludeña, Sebastián; Rohrer, Mario; McArdell, Brian

    2013-04-01

    In high-mountain areas climatic extreme events can combine with effects of gradual climate change to form cascading processes, occasionally resulting in major disasters. Heavy precipitation events thereby evolve into mass movement processes such as landslides, avalanches and debris flows that can devastate urban areas at the foot of mountains. The transformation and interaction of processes are complex and often not sufficiently understood or difficult to predict, and thus more research is needed. Of particular concern are landslide impacts into existing or new glacier lakes from destabilized mountain flanks in relation with glacier retreat and permafrost degradation. Here we analyze a number of recent events in the Andes of Peru and compare them with observations in the Alps in Europe. In southern Peru debris flow events that were among the largest recent ones worldwide remained largely unstudied although they destroyed entire towns and important traffic and energy infrastructure. We used a combination of field work, satellite images, satellite rainfall data and available meteorological stations as well as numerical modeling to reconstruct origin, type and effect of these events. Large sediment deposits resulting from deglaciation processes represent a key factor, and were mobilized by heavy rainfall events. Tens of millions of m3 sediment were transported downstream in single events, with compound effects on downstream river systems causing destruction and inundation. Other recent events in Peru underline the importance of a cascade of process interaction, with ice avalanches impacting glacier lakes, triggering flood waves and debris flows that travel downstream and eventually impact urban areas. In the Alps recent observations indicate an increase of occurrence of complex compound processes with short-term climatic events overprinting on longer-term effects of gradual climate change (e.g. from glacier retreat and permafrost degradation). Especially important are

  17. Rainfall thresholds for the activation of shallow landslides in the Italian Alps: the role of environmental conditioning factors

    Science.gov (United States)

    Palladino, M. R.; Viero, A.; Turconi, L.; Brunetti, M. T.; Peruccacci, S.; Melillo, M.; Luino, F.; Deganutti, A. M.; Guzzetti, F.

    2018-02-01

    The aim of the present work is to investigate the role exerted by selected environmental factors in the activation of rainfall-triggered shallow landslides and to identify site-specific rainfall thresholds. The study concerns the Italian Alps. The region is exposed to widespread slope instability phenomena due to its geological, morphological and climatic features. Furthermore, the high level of anthropization that characterizes wide portions of the territory increases the associated risk. Hence, the analysis of potential predisposing factors influencing landslides triggering is worthwhile to improve the current prediction skills and to enhance the preparedness and the response to these natural hazards. During the last years, the Italian National Research Council's Research Institute for Hydro-geological Protection (CNR-IRPI) has contributed to the analysis of triggering conditions for rainfall-induced landslides in the framework of a national project. The project, funded by the National Department for Civil Protection (DPC), focuses on the identification of the empirical rainfall thresholds for the activation of shallow landslides in Italy. The first outcomes of the project reveal a certain variability of the pluviometric conditions responsible for the mass movements activation, when different environmental settings are compared. This variability is probably related to the action of local environmental factors, such as lithology, climatic regime or soil characteristics. Based on this hypothesis, the present study aims to identify separated domains within the Italian Alps, where different triggering conditions exist and different countermeasures are needed for risk prevention. For this purpose, we collected information concerning 511 landslides activated in the period 2000-2012 and reconstructed 453 rainfall events supposed to be responsible for the activations. Then, we selected a set of thematic maps to represent the hypothesised landslide conditioning factors

  18. Bedrock topography beneath uppermost part of Aletsch glacier, Central Swiss Alps, revealed from cosmic-ray muon radiography

    Science.gov (United States)

    Nishiyama, Ryuichi; Ariga, Akitaka; Ariga, Tomoko; Käser, Samuel; Lechmann, Alessandro; Mair, David; Scampoli, Paola; Vladymyrov, Mykhailo; Ereditato, Antonio; Schlunegger, Fritz

    2017-04-01

    In mountainous landscapes such as the Central Alps of Europe, the bedrock topography is one of the most interesting subjects of study since it separates the geological substratum (bedrock) from the overlying unconsolidated units (ice). The geometry of the bedrock topography puts a tight constraint on the erosional mechanism of glaciers. In previous studies, it has been inferred mainly from landscapes where glaciers have disappeared after the termination of the last glacial epoch. However, the number of studies with a focus on the structure beneath active glaciers is limited, because existing exploration methods have limitation in resolution and mobility. The Eiger-μ project proposes a new technology, called muon radiography, to investigate the bedrock geometry beneath active glaciers. The muon radiography is a recent technique that relies on the high penetration power of muon components in natural cosmic rays. Specifically, one can resolve the internal density profile of a gigantic object by measuring the attenuation rate of the intensity of muons after passing through it, as in medical X-ray diagnostic. This technique has been applied to many fields such as volcano monitoring (eg. Ambrosino et al., 2015; Jourde et al., 2016; Nishiyama et al., 2016), detection of seismic faults (eg. Tanaka et al., 2011), inspection inside nuclear reactors, etc. The first feasibility test of the Eiger-μ project has been performed at Jungfrau region, Central Swiss Alps, Switzerland. We installed cosmic-ray detectors consisting of emulsion films at three sites along the Jungfrau railway tunnel facing Aletsch glacier (Jungfraufirn). The detectors stayed 47 days in the tunnel and recorded the tracks of muons which passed through the glacier and bedrock (thickness is about 100 m). Successively the films were chemically developed and scanned at University of Bern with microscopes originally developed for the analysis of physics experiments on neutrino oscillation. The analysis of muon

  19. Aflatoksin Bı in tavşan eritrosit, karaciğer, böbrek arginaz aktiviteleri ile serum ALP, AST, ALT düzeylerine etkisi

    OpenAIRE

    TEMEL, Yrd.Doç.Dr. İsmail; İLHAN, Yrd.Doç.Dr.Necip; EMRE, Yrd.Doç.Dr. Hanifi; ÇIĞLI, Yrd.Doç.Dr. Ahmet; YOLOGLU, Yrd.Doç.Dr. Saim; KARAKAŞ, Yrd.Doç.Dr.Sacide

    2015-01-01

    Otuz tavşan A.B.C ve kontrol olmak üzere dört gruba ayrıldı. A,li,(' gruplarına üç ay süreyle farklı dozlarda aflatoksin B/ (AFBt ) verildi. Diğer taraftan kontrol grubu normal besinlerle beslendi. Serum ALP.AST.ALTdüzeyleri AFBj uygulamasından fince ve sonra tesj>it edildi. Eritrosit, karaciğer, ve böbrek arginaz aktiviteleri yalnızca AFBt uygulamasından sonra ölçüldü. AST ve ALT nin ilk ve son değerleri arasındaki fark istatiksel olarak önemliydi fakat ALP düzeyleri ö...

  20. New Ways through the Alps The New Gotthard Base Tunnel - Impact of a Big Construction Site on a Small Mountain Village

    OpenAIRE

    Simone Strauf; Manfred Walser

    2005-01-01

    For Switzerland as located in the heart of Europe transport policy is a matter of particular importance. Especially transports between Italy and Germany use the Swiss corridors through the Alps. Therefore Switzerland realised a most ambitious construction project called NEAT (Neue Alpen Transversale) to improve the European train connections especially for freight transports. One part of the project is the new Gotthard base tunnel, the longest railway tunnel of the world and the most impressi...

  1. FIRST EURYPTERID FROM ITALY: A NEW SPECIES OFADELOPHTHALMUS (CHELICERATA: EURYPTERIDA FROM THE UPPER CARBONIFEROUS OF THE CARNIC ALPS (FRIULI, NE ITALY

    Directory of Open Access Journals (Sweden)

    JAMES C. LAMSDELL

    2013-07-01

    Full Text Available The first eurypterid known from Italy is described, as Adelophthalmus piussii n. sp. It comes from the Upper Carboniferous of the Carnic Alps (Friuli, NE Italy. Relationships with related species are discussed. Adelophthalmids are the commonest eurypterids of the late Palaeozoic, at which time the disparity of the order was waning. The new record enhances our knowledge of adelophthalmid distribution and diversity.

  2. Being treated in higher volume hospitals leads to longer progression-free survival for epithelial ovarian carcinoma patients in the Rhone-Alpes region of France

    OpenAIRE

    Huguet, Marius; Perrier, Lionel; Bally, Olivia; Benayoun, David; De Saint Hilaire, Pierre; Beal Ardisson, Dominique; Morelle, Magali; Havet, Nathalie; Joutard, Xavier; Meeus, Pierre; Gabelle, Philippe; Provençal, Jocelyne; Chauleur, Céline; Glehen, Olivier; Charreton, Amandine

    2018-01-01

    Background To investigate the relationship between hospital volume activities and the survival for Epithelial Ovarian Carcinoma (EOC) patients in France. Methods This retrospective study using prospectively implemented databases was conducted on an exhaustive cohort of 267 patients undergoing first-line therapy during 2012 in the Rhone-Alpes Region of France. We compared Progression-Free Survival for Epithelial Ovarian Carcinoma patients receiving first-line therapy in high- (i.e. ≥ 12 cases/...

  3. Effect of two kinds of porcelain crown on AST, ALP, TNF-α, IL-8, GP-x and MDA levels in gingival crevicular fluid

    Directory of Open Access Journals (Sweden)

    Ya-Ling Wang

    2016-09-01

    Full Text Available Objective: To investigate the effect of two kinds of porcelain crown on AST, ALP, TNF-α, IL-8, GP-x and MDA levels in gingival crevicular fluid. Methods: A total of 80 patients with dental porcelain crowns at front teeth during February 2013 to February 2016 were randomly divided into cobalt-chromium alloy PFM group (n=40 and gold alloy PFM group (n=40. After 6 months, the amount of gingival crevicular fluid, GI, PD, AST, ALP, TNF-α, IL-8, GP-x and MDA levels in gingival crevicular fluid were recorded and analyzed. Results: There were no differences in amount of gingival crevicular fluid, GI and PD before treatment of the two groups (P>0.05. After treatment, the amount of gingival crevicular fluid, GI and PD of the two groups were significantly higher than before treatment (P0.05. After treatment, the AST, ALP, TNF-α, IL-8 and MDA levels in gingival crevicular fluid of the two groups were significantly higher than before treatment (P<0.05, but that of the gold alloy PFM group were significantly lower than cobalt-chromium alloy PFM group (P<0.05. After treatment, the GP-x level in gingival crevicular fluid of the two groups were significantly lower than before treatment (P<0.05, but that of the gold alloy PFM group were significantly higher than cobalt-chromium alloy PFM group (P<0.05. Conclusions: Gold alloy PFM can significantly reduce the AST, ALP, TNF-α, IL-8 and MDA levels in gingival crevicular fluid, improve the GP-x level in gingival crevicular fluid, shows better biocompatibility and clinical outcomes than cobalt-chromium alloy PFM.

  4. When to sample in an inaccessible landscape: a case study with carabids from the Allgäu (northern Alps) (Coleoptera, Carabidae)

    OpenAIRE

    Harry,Ingmar; Drees,Claudia; Hofer,Hubert; Assmann,Thorsten

    2011-01-01

    Abstract While pitfall trapping is generally accepted as the standard method for sampling carabid beetles, this method has rarely been used in mountain ecosystems, mainly due to the high labour intensity it involves. As part of a research project in the German Alps, we investigated the phenologic appearance of adult carabid beetles in mountain ecosystems along with the consequences of possible reductions in sampling periods. Our results show that an early activity peak among carabids is predo...

  5. Are empidine dance flies major flower visitors in alpine environments? A case study in the Alps, France.

    Science.gov (United States)

    Lefebvre, Vincent; Fontaine, Colin; Villemant, Claire; Daugeron, Christophe

    2014-11-01

    Pollination is one of the most important ecosystem services and bees the most important pollinators. As a population decline of bees has been documented in numerous regions of the world, it is crucial to develop understanding on other possible pollinators. Here, we study the potential pollination impact of Diptera, and among them Empidinae, in an alpine environment, where the abundance of bees is naturally lower. Interactions between 19 entomophilous plants and their flower visitors were recorded in a subalpine meadow in the French Alps during six weeks. Visitation frequencies were used to build the flower-visitor network. Our results show that interactions between flies and plants are dominant; flies represent more than 60% of all visitors, with 54% of them being Empidinae. We especially found that flies, Empidinae and bees are the main visitors of 11, three and one plants, respectively. When considering both bees and Syrphidae together, six plants were more visited by Empidinae; when considering bees and Syrphidae separately, 10 plants were more visited by Empidinae than by bees or Syrphidae. The results support the idea that flies widely replace bees as main flower visitors at altitude, and among them the Empidinae might play a key role in pollination. © 2014 The Author(s) Published by the Royal Society. All rights reserved.

  6. 3D modelling of the Austroalpine-Penninic collisional wedge of the NW Alps: dataset management and preliminary results

    Science.gov (United States)

    Monopoli, Bruno; Bistacchi, Andrea; Bertolo, Davide; Dal Piaz, Giovanni; Gouffon, Yves; Massironi, Matteo; Sartori, Mario; Vittorio Dal Piaz, Giorgio

    2016-04-01

    We know since the beginning of the 20th century, thanks to mapping and structural studies by the Italian Regio Servizio Geologico (Franchi et al., 1908) and Argand's work (1909; 1911; 1916), that the Austroalpine-Penninic collisional wedge of the NW Alps is spectacularly exposed across the Aosta Valley and Valais ranges (Italy and Switzerland). In the 150th anniversary of the first ascent to Ruskin's "most noble cliff in Europe" - the Cervino/Matterhorn (Whymper, July 14th 1865), first described in a geological profile by Giordano (1869) and in a detailed map by Gerlach (1869; 1871), we have seen the conclusion of very detailed mapping projects carried out in the last years over the two regions, with collaborative efforts across the Italy-Switzerland border, constellated by 4000 m-high peaks. These projects have pictured with an unprecedented detail (up to 1:10.000 scale) the geology of this complex region, resulting from pre-Alpine events, Alpine subduction- and collision-related ductile deformations, and finally late-Alpine brittle deformations from the Oligocene to the Present. Based on this dataset, we use up-to-date technology and software to undertake a 3D modelling study aimed at: i) reconstructing the 3D geometry of the principal tectonic units, ii) detecting and unravelling problems and incongruences in the 2D geometrical models, iii) modelling the kinematics of the Oligocene and Miocene brittle fault network using 2D and 3D balancing and palinspastic restoration techniques. In this contribution we mainly discuss the prerequisites of the project. Common geomodelling paradigms (mainly developed for the hydrocarbon industry) cannot be applied in this project due to (i) the little scale, (ii) the source of the data - fieldwork, and (iii) the polyphase ductile and brittle deformations in the metamorphic nappe stack. Our goals at the moment are to model the post-metamorphic fault network and the boundaries of the principal tectonic units, which will be

  7. Sedimentological and biostratigraphical analyses of short sediment cores from Hagelseewli (2339 m a.s.l. in the Swiss Alps

    Directory of Open Access Journals (Sweden)

    Jacqueline F.N. VAN LEEUWEN

    2000-09-01

    Full Text Available Several short sediment cores of between 35 and 40 cm from Hagelseewli, a small, remote lake in the Swiss Alps at an elevation of 2339 m a.s.l. were correlated according to their organic matter content. The sediments are characterized by organic silts and show in their uppermost part a surprisingly high amount of organic matter (30-35%. Synchronous changes, occurring in pollen from snow-bed vegetation, the alga Pediastrum, chironomids, and grain-size composition, point to a climatic change interpreted as cooler or shorter summers that led to prolonged ice-cover on the lake. According to palynological results the sediments date back to at least the early 15th century A.D., with the cooling phase encompassing the period between late 16th and the mid-19th century thus coinciding with the Little Ice Age. Low concentrations of both chironomid head capsules and cladoceran remains in combination with results from fossil pigment analyses point to longer periods of bottom-water anoxia as a result of long-lasting ice-cover that prevented mixing of the water column. According to our results aquatic biota in Hagelseewli are mainly indirectly influenced by climate change. The duration of ice-cover on the lake controls the mixing of the water column as well as light-availability for phytoplankton blooms.

  8. The basal Lutetian Transgression on the Tethyan shelf of the European craton (Adelholzen beds, Eastern Alps, Germany).

    Science.gov (United States)

    Egger, Hans; Briguglio, Antonino; Rögl, Fred; Darga, Robert

    2013-10-01

    The middle Eocene Adelholzen beds were deposited on the northern part of the Tethyan shelf of the European Plate. In the Eastern Alps, the Wimmern section near Teisendorf (Germany) is the only known outcrop exposing the basal unconformity of this sequence. The outcrop comprises an 8 m thick condensed transgressive shallow marine succession characterized by glauconite-rich weakly consolidated greensand and mudstone containing abundant larger benthic foraminifera. It spans the lower part of calcareous nannoplankton Zone NP15 (Sub-Zones NP15a and lower part of NP15b), planktonic foraminifera Sub-Zone E7b and Zone E8 partim and the upper part of shallow benthic Zone SBZ13. The landward migration of the paleo-shoreline was not an effect of flexural downbending of the European Plate but can be correlated to the major unconformity at the base of eustatic supercycle TA3. The onset of this sea-level rise was in the latest part of Biochron NP14b and almost coincided with the NP14b/NP15a-boundary.

  9. Aggregation and C dynamics along an elevation gradient in carbonate-containing grassland soils of the Alps

    Science.gov (United States)

    Garcia-Franco, Noelia; Wiesmeier, Martin; Kiese, Ralf; Dannenmann, Michael; Wolf, Benjamin; Zistl-Schlingmann, Marcus; Kögel-Knabner, Ingrid

    2017-04-01

    C sequestration in mountainous grassland soils is regulated by physical, chemical and biological soil process. An improved knowledge of the relationship between these stabilization mechanisms is decisive to recommend the best management practices for climate change mitigation. In this regard, the identification of a successful indicator of soil structural improvement and C sequestration in mountainous grassland soils is necessary. Alpine and pre-alpine grassland soils in Bavaria represent a good example for mountainous grassland soils faced with climate change. We sampled grassland soils of the northern limestone alps in Bavaria along an elevation gradient from 550 to 1300 m above sea level. We analyzed C dynamics by a comparative analysis of the distribution of C according to aggregate size classes: large-macroaggregates (> 2000 µm), small-macroaggregates (250-2000 µm), microaggregates (63-250 µm), silt plus clay particles (soil. Our preliminary results showed higher C content and changed water-stable aggregate distribution in the high elevation sites compared to lower elevations. Magnesium carbonate seem to play an important role in stabilizing macroaggregates formed from fresh OM. In addition, the isolation of occluded microaggregates within macroaggregates will help us to improve our understanding on the effects of climate change on soil structure and on the sensitivity of different C stabilization mechanisms present in mountainous soils.

  10. Hydrogeological characterization throughout deep geophysical investigations in the Verrès plain (Aosta Valley, north-western Italian Alps

    Directory of Open Access Journals (Sweden)

    Pietro Capodaglio

    2017-03-01

    Full Text Available Although fresh water availability in the Aosta Valley (north-western Italian Alps is generally granted by glaciers and snow seasonal melting at high altitudes, hydrogeological conditions are not favorable everywhere. Most part of the territory is typically mountainous, with prevailing metamorphic rocks and, secondarily, glacial deposits. Relevant ground water bodies can be found only in the main bottom valley, where glacial excavation, fluvio-glacial and lacustrine sedimentation had maximum intensity, allowing the deposition of important thickness of porous materials. Nevertheless, the geological knowledge of the subsurface is here still poor. These groundwater bodies are monitored by the Environmental Protection Agency of the Aosta Valley Region (ARPA Valle d’Aosta, according to the Italian law (D.Lgs.30/09. This study deals with geophysical investigations in the Verrès plain aquifer (southern Aosta Valley. The main goal of the study has been the first evaluation of groundwater research in potential deep aquifers. Different geophysical methodologies were applied (ERT, TDEM, HVSR, and Re.Mi., in order to identify the deep aquifer geometry and the rock basement depth.

  11. Mesozoic (Lower Jurassic) red stromatactis limestones from the Southern Alps (Arzo, Switzerland): calcite mineral authigenesis and syneresis-type deformation

    Science.gov (United States)

    Neuweiler, Fritz; Bernoulli, Daniel

    2005-02-01

    The Broccatello lithological unit (Lower Jurassic, Hettangian to lower parts of Upper Sinemurian) near the village of Arzo (southern Alps, southern Switzerland) is a mound-shaped carbonate deposit that contains patches of red stromatactis limestone. Within the largely bioclastic Broccatello unit, the stromatactis limestone is distinguished by its early-diagenetic cavity system, a relatively fine-grained texture, and an in-situ assemblage of calcified siliceous sponges (various demosponges and hexactinellids). A complex shallow subsurface diagenetic pathway can be reconstructed from sediment petrography in combination with comparative geochemical analysis (carbon and oxygen isotopes; trace and rare earth elements, REE + Y). This pathway includes organic matter transformation, aragonite and skeletal opal dissolution, patchy calcification and lithification, sediment shrinkage, sagging and collapse, partial REE remobilization, and multiple sediment infiltration. These processes occurred under normal-marine, essentially oxic conditions and were independent from local, recurring syn-sedimentary faulting. It is concluded that the stromatactis results from a combination of calcite mineral authigenesis and syneresis-type deformation. The natural stromatactis phenomenon may thus be best explained by maturation processes of particulate polymer gels expected to form in fine-grained carbonate sediments in the shallow subsurface. Conditions favorable for the evolution of stromatactis appear to be particularly frequent during drowning of tropical or subtropical carbonate platforms.

  12. Survival of cardiac arrest patients on ski slopes: A 10-year analysis of the Northern French Alps Emergency Network.

    Science.gov (United States)

    Viglino, Damien; Maignan, Maxime; Michalon, Arnaud; Turk, Julien; Buse, Sarah K; Blancher, Marc; Aufderheide, Tom P; Belle, Loïc; Savary, Dominique; Ageron, François-Xavier; Debaty, Guillaume

    2017-10-01

    Intense physical activity, cold and altitude make mountain sports a cause of increased risk of out-of-hospital cardiac arrest (OHCA). The difficulties of pre-hospital management related to this challenging environment could be mitigated by the presence of ski-patrollers in ski areas and use of helicopters for medical rescue. We assess whether this particular situation positively impacts the chain of survival compared to the general population. Analysis of prospectively collected data from the cardiac arrest registry of the Northern French Alps Emergency Network (RENAU) from 2004 to 2014. 19,341 OHCAs were recorded during the period, including 136 on-slope events. Compared to other OHCAs, on-slope patients were younger (56 [40-65] vs. 66 [52-79] years, pski slopes presented a higher survival rate, possibly explained by a healthier population, the efficiency of resuscitation by ski-patrols and similar time to ALS facilities compared to other cardiac arrests. Copyright © 2017 Elsevier B.V. All rights reserved.

  13. Are ethnic minorities synonymous for genetic isolates? Comparing Walser and Romance populations in the Upper Lys Valley (Western Alps).

    Science.gov (United States)

    Boattini, Alessio; Griso, Clio; Pettener, Davide

    2011-01-01

    Cultural differences between neighbouring populations are often said to give rise to reproductive barriers. For ethnic minorities, these barriers can easily result in genetic isolation. In this study, we analyse the surname structure of the Walser of the upper Lys Valley, a German-speaking ethnic minority in the Italian Western Alps, to better understand the relationships between linguistic and genetic isolation. Analyses were based on 1713 marriages registered from 1838 to 1938 in four villages of the valley: three Walser communities (Issime, Gressoney-Saint-Jean, Gressoney-La-Trinité) and the Romance community of Gaby. The results show that endogamy and inbreeding are lower than in other Italian linguistic minorities, with the exception of Gaby, whose values rank among the highest ever found in Italy. Compared to the Walser communities' Gaby behaves as an outgroup and has an almost exclusively autochthonous surname set. The latter aspect is also true, but to a lesser extent, for the Walser villages, in particular for Issime on the one hand and Gressoney-Saint-Jean and Gressoney-La-Trinité on the other. These findings strongly suggest that the Walser communities' ethnic minority status is not associated with genetic isolation, whereas genetic isolation was found in the linguistically non-isolated Gaby. Finally, our results are consistent with two independent late medieval migration events at the origin of these Walser settlements.

  14. Characterization of Modern and Fossil Mineral Dust Transported to High Altitude in the Western Alps: Saharan Sources and Transport Patterns

    Directory of Open Access Journals (Sweden)

    Florian Thevenon

    2012-01-01

    Full Text Available Mineral dust aerosols recently collected at the high-altitude Jungfraujoch research station (N, E; 3580 m a.s.l. were compared to mineral dust deposited at the Colle Gnifetti glacier (N, E; 4455 m a.s.l. over the last millennium. Radiogenic isotope signatures and backward trajectories analyses indicate that major dust sources are situated in the north-central to north-western part of the Saharan desert. Less radiogenic Sr isotopic compositions of PM10 aerosols and of mineral particles deposited during periods of low dust transfer likely result from the enhancement of the background chemically-weathered Saharan source. Saharan dust mobilization and transport were relatively reduced during the second part of the Little Ice Age (ca. 1690–1870 except within the greatest Saharan dust event deposited around 1770. After ca. 1870, sustained dust deposition suggests that increased mineral dust transport over the Alps during the last century could be due to stronger spring/summer North Atlantic southwesterlies and drier winters in North Africa. On the other hand, increasing carbonaceous particle emissions from fossil fuel combustion combined to a higher lead enrichment factor point to concomitant anthropogenic sources of particulate pollutants reaching high-altitude European glaciers during the last century.

  15. Fission track ages on apatite of Bergell rocks from central Alps and Bergell boulders in Oligocene sediments

    International Nuclear Information System (INIS)

    Wagner, G.A.; Miller, D.S.

    1979-01-01

    Previous radiometric dating studies indicated that the Bergell region, in contrast to other regions of the Central Alps, experienced an early, rapid uplift, but with decreasing rate. Furthermore, there is also a geological record of the early uplift history of the Bergell granite by the existence of boulders which were derived from this granite and which occur in the Late Oligocene sediments of the Po plain. In this work the uplift history of the Bergell is studied in more detail by fission track dating of additional apatites from the Bergell region. Secondly, by determining apatite fission track ages the granitic boulders of the Po plain can be re-assigned to their original vertical position within the Bergell intrusive before erosion removed them in Late Oligocene time. A rather conservative estimate replaces them 6 km above the present morphology of the Bergell massif. Thus, the thickness of the Bergell granite must have been at least 8 km. Generally, fission track studies on boulders may become an important tool to study the vertical extent of mountain chains during the geological past. (Auth.)

  16. LOCAL AND GENERAL MONITORING OF FORNI GLACIER (ITALIAN ALPS USING MULTI-PLATFORM STRUCTURE-FROM-MOTION PHOTOGRAMMETRY

    Directory of Open Access Journals (Sweden)

    M. Scaioni

    2017-09-01

    Full Text Available Experts from the University of Milan have been investigating Forni Glacier in the Italian alps for decades, resulting in the archive of a cumbersome mass of observed data. While the analysis of archive maps, medium resolution satellite images and DEM’s may provide an overview of the long-term processes, the application of close-range sensing techniques offers the unprecedented opportunity to operate a 4D reconstruction of the glacier geometry at both global and local levels. In the latest years the availability of high-resolution DEM's from stereo-photogrammetry (2007 and UAV-photogrammetry (2014 and 2016 has allowed an improved analysis of the glacier ice-mass balance within time. During summer 2016 a methodology to record the local disruption processes has been investigated. The presence of vertical and sub-vertical surfaces has motivated the use of Structure-from-Motion Photogrammetry from ground-based stations, which yielded results comparable to the ones achieved using a long-range terrestrial laser scanner. This technique may be assumed as benchmarking for accuracy assessment, but is more difficult to be operated in high-mountain areas. Nevertheless, the measurement of GCP’s for the terrestrial photogrammetric project has revealed to be a complex task, involving the need of a total station a GNSS. The effect of network geometry on the final output has also been investigated for SfM-Photogrammetry, considering the severe limitations implied in the Alpine environment.

  17. Thallium-rich pyrite ores from the Apuan Alps, Tuscany, Italy:constraints for their origin and environmental concerns

    Science.gov (United States)

    D'Orazio, Massimo; Biagioni, Cristian; Dini, Andrea; Vezzoni, Simone

    2017-06-01

    The southern sector of the Apuan Alps (AA) massif, Tuscany, Italy, is characterized by the occurrence of a series of baryte-pyrite-iron oxide orebodies whose Tl-rich nature was recognized only recently. The geochemistry of the pyrite ore was investigated through inductively coupled plasma mass spectrometry. In addition, lead isotope data for selected pyrite ores from AA were collected. Pyrite ores are characterized by a complex geochemistry, with high concentrations of Tl (up to 1100 μg/g) coupled with high As and Sb contents; the Co/Ni ratio is always mining districts of Tuscany have been collected in order to compare them with those from the AA. These samples usually have very low Tl content (less than 2 μg/g) and high to very high Co/Ni and As/Sb ratios. Only some samples from the Sb-Hg ore deposits showed very high Tl concentrations (up to 3900 μg/g). Another difference is related to the lead isotope composition, with pyrite ores from AA markedly less radiogenic than those from the other deposits from Tuscany. Geochemical data of pyrite ores from AA give new insights on the genesis of the baryte-pyrite-iron oxide orebodies, relating their formation to low-temperature hydrothermal systems active during early Paleozoic; in addition, these data play a fundamental role in assessing the environmental impact of these deposits.

  18. Dynamics and structure of natural regeneration in three high elevation LTER area in the Dolomites (North-Eastern Alps, Italy

    Directory of Open Access Journals (Sweden)

    Soraruf L

    2007-01-01

    Full Text Available Regeneration structures and spatial patterns of European larch (Larix decidua Miller, Swiss stone pine (Pinus cembra L. and Norway spruce (Picea abies (L. Karst., were analyzed in three high elevation LTER area in the Dolomites (North-Eastern Alps. Larch and spruce regeneration is mainly affected by dense forest cover and grasses competition whereas stone pine is mostly sensitive to late snow melting, fungal diseases and wild ungulate damages. The current stand and regeneration structure suggests that larch has been highly fostered in the past due to silvo-pastoral management practices. All species show a clear tendency to spatial intraspecific aggregation especially at short-distances. The spatial patterns of larch regeneration are more complex than the other two species, more heavily affected by a main factor such as the nutcracker (Nucifraga caryocatactes L. seed dispersal for stone pine or presence of canopy gaps for spruce. However, spatial patterns of all species depend on the number of the available microsites, that often match at small distance driving the formation of small mixed and unevenaged patches. Combining the age structure and spatial pattern information we were able to better understand the small-scale patterns and processes and the role of the past disturbances on the regeneration dynamics in space and time.

  19. Spatial and seasonal variations in mobile carbohydrates in Pinus cembra in the timberline ecotone of the Central Austrian Alps.

    Science.gov (United States)

    Gruber, A; Pirkebner, D; Oberhuber, W; Wieser, G

    2011-03-01

    To test whether the altitudinal limit of tree growth is determined by carbons shortage or by a limitation in growth we investigated non structural carbohydrates and their components starch and total soluble sugars in Pinus cembra trees along an elevational gradient in the timberline ecotone of the Central Austrian Alps. NSC contents in needles, branches, stems, and coarse roots were measured throughout an entire growing season. At the tissue level NSC contents were not significantly more abundant in treeline trees as compared to trees at lower elevations. Along our 425 m elevational transect from the closed forest to the treeline we failed to find a stable elevational trend in the total NSC pool of entire trees and observed within season increases in the tree's NSC pool that can be attributed to an altitudinal increase in leaf mass as needles contained the largest NSC fraction of the whole tree NSC pool. Furthermore, whole tree NSC contents were positively correlated with net photosynthetic capacity. Although our observed NSC characteristics do not support the hypothesis that tree life at their upper elevational limit is determined by an insufficient carbon balance we found no consistent confirmation for the sink limitation hypothesis.

  20. [A programme to support clinical evaluation of medical devices: pilot experiment in the Rhône-Alpes region].

    Science.gov (United States)

    Huot, L; Decullier, E; Aulagner, G; Chapuis, F R

    2012-09-01

    The drug and medical devices Committee of the University Hospital of Lyon faces the weakness of clinical data available to justify medical devices purchase. The Hospital of Lyon has worked with several organisms of the Rhône-Alpes region to set up a pilot programme aimed at encouraging small and medium enterprises (SMEs) to realise clinical studies for the evaluation of their medical device. We report the results of this experiment which took place from 2007 to 2010. Eligible projects were selected on the basis of their scientific interest. A specific structure for regulatory and methodological support was set up. Twenty companies applied, seventeen were selected. Eight research protocols were written; four clinical studies were implemented. These studies were performed by micro-companies for medical devices that could be considered as innovative device or substantial novelty. Two draft protocols were started but deferred by choice of the company. For projects that did not lead to a research protocol or study, the main causes were: a longer than expected development phase (n = 3); a problem linked to methodological feasibility (n = 1); the unsuccessful search for a principal investigator (n = 2); or the company's choice (n = 5). This pilot experience in France has supported and trained regional SMEs in clinical research. Its continuation could encourage manufacturers to conduct clinical trials of good quality. Copyright © 2012. Published by Elsevier Masson SAS.

  1. Population genomic footprints of selection and associations with climate in natural populations of Arabidopsis halleri from the Alps

    Science.gov (United States)

    Fischer, Martin C; Rellstab, Christian; Tedder, Andrew; Zoller, Stefan; Gugerli, Felix; Shimizu, Kentaro K; Holderegger, Rolf; Widmer, Alex

    2013-01-01

    Natural genetic variation is essential for the adaptation of organisms to their local environment and to changing environmental conditions. Here, we examine genomewide patterns of nucleotide variation in natural populations of the outcrossing herb Arabidopsis halleri and associations with climatic variation among populations in the Alps. Using a pooled population sequencing (Pool-Seq) approach, we discovered more than two million SNPs in five natural populations and identified highly differentiated genomic regions and SNPs using FST-based analyses. We tested only the most strongly differentiated SNPs for associations with a nonredundant set of environmental factors using partial Mantel tests to identify topo-climatic factors that may underlie the observed footprints of selection. Possible functions of genes showing signatures of selection were identified by Gene Ontology analysis. We found 175 genes to be highly associated with one or more of the five tested topo-climatic factors. Of these, 23.4% had unknown functions. Genetic variation in four candidate genes was strongly associated with site water balance and solar radiation, and functional annotations were congruent with these environmental factors. Our results provide a genomewide perspective on the distribution of adaptive genetic variation in natural plant populations from a highly diverse and heterogeneous alpine environment. PMID:24102711

  2. U-Th-Pb dating of the Brossasco ultrahigh-pressure metagranite, Dora-Maira massif, western Alps

    International Nuclear Information System (INIS)

    Paquette, J.L.; Montel, J.M.; Chopin, C.

    1999-01-01

    The Brossasco metagranite is part of the coherent ultrahigh-pressure metamorphic terrane in the Dora-Maira massif and, although it has reached Alpine peak metamorphic conditions of about 725 C/30 kbar, still locally preserves an undeformed magmatic texture. In order to obtain new chronological constraints on this key area of the western Alps, we studied the behaviour of the U-Th-Pb system in zircons and monazites from such an undeformed facies. Only zircon fractions containing very small needle-shaped inclusions are concordant at 304±3 Ma. This result is interpreted as the emplacement age of the granite. All other zircons show an old inherited memory and the more U-rich of these crystals were affected by an episodic Pb loss with a poorly defined lower intercept at 60±45 Ma. Both TIMS (thermo-ionisation mass spectrometry) and electron-microprobe analysis of monazites show that this last event has also disturbed their U-Pb and Th-Pb isotopic systems, without resetting them completely. Comparison with cofacial rock-types which have been completely reworked under these extreme P-T conditions shows that deformation and mass transfer as well as the nature of the protoliths and the characteristics of their zircons have a much more pronounced influence on the behaviour of isotopic systems than the temperature and/or pressure parameters. This evidence is an obvious limitation to the use of the blocking-temperature concept. (orig.)

  3. Long-term air monitoring of organochlorine pesticides using Semi Permeable Membrane Devices (SPMDs) in the Alps

    Energy Technology Data Exchange (ETDEWEB)

    Levy, W.; Henkelmann, B.; Pfister, G.; Bernhoeft, S.; Kirchner, M.; Jakobi, G. [Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Ingolstaedter Landstrasse 1, D-85764 Neuherberg (Germany); Bassan, R. [Regional Agency for Environmental Prevention and Protection of Veneto, Via Matteotti 27, 35137 Padova (Italy); Kraeuchi, N. [WSL-Swiss Federal Institute for Forest, Snow and Landscape Research, Zuercherstrasse 111, CH-8903 Birmensdorf (Switzerland); Schramm, K.-W., E-mail: schramm@helmholtz-muenchen.d [Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Ingolstaedter Landstrasse 1, D-85764 Neuherberg (Germany); TUM-Technische Universitaet Muenchen, Department fuer Biowissenschaftliche Grundlagen Weihenstephaner Steig 23, D-85350 Freising (Germany)

    2009-12-15

    Atmospheric sampling of organochlorine pesticides (OCPs) was conducted using Semi Permeable Membrane Devices (SPMDs) deployed in the Alps at different altitudinal transects for two consecutive exposure periods of half a year and a third simultaneous year-long period. Along all the altitude profiles, the sequestered amounts of OCPs increased in general with altitude. SPMDs were still working as kinetic samplers after half a year for the majority of the OCPs. However, compounds with the lowest octanol-air partition coefficient (K{sub oa}), reached equilibrium within six months. This change in the SPMD uptake was determined for the temperature gradient along the altitude profile influencing K{sub oa}, OCPs availability in the gaseous phase, and SPMD performance. In sum, it seems two effects are working in parallel along the altitude profiles: the change in SPMD performance and the different availability of OCPs along the altitudinal transects determined by their compound properties and concentrations in air. - SPMDs were in different uptake stages regarding OCPs, as they were influenced by the temperature (season, triolein state, and altitude) and K{sub oa}.

  4. Influence of the Geometry Alteration of the Landslide Slope on its Stability: A Case Study in the Carnian Alps (Italy)

    Science.gov (United States)

    Zabuski, Lesław; Bossi, Giulia; Marcato, Gianluca

    2017-12-01

    The paper presents the principles of the slope reprofiling and proves the effectiveness of this stabilization measure. The case study of two adjacent landslides in the National Road 52 "Carnica" in the Tagliamento River valley, the Carnian Alps (46°23'49″N, 12°42'51″E) are the example allowing for illustration of this approach. The phenomena have been studied for more than a decade, making it possible to carry out a detailed geological and geomorphological reconstruction. That was done on the basis of a large amount of monitoring data collected during that period. Since the landslides are threatening an important road, countermeasure works to ameliorate the stability conditions of the slides need to be designed. The paper focuses on the creation of a numerical model consistent with monitoring data and capable of reconstructing the dynamics of both landslides. Two cross-sections, one for each landslide, were selected for the analysis. The geometry of the slip surface was determined on the basis of control points, such as slip surface readings from inclinometers, and geomorphological evidence for the contour. The FLAC2D code was used to evaluate the current stability of these landslides and to determine the effectiveness of changing the slope geometry by removing material from the upper part of the slope and putting it to the lowest part as reinforcement.

  5. Relationships between botanical and chemical composition of forages: a multivariate approach to grasslands in the Western Italian Alps.

    Science.gov (United States)

    Ravetto Enri, Simone; Renna, Manuela; Probo, Massimiliano; Lussiana, Carola; Battaglini, Luca M; Lonati, Michele; Lombardi, Giampiero

    2017-03-01

    Plant composition of species-rich mountain grasslands can affect the sensorial and chemical attributes of dairy and meat products, with implications for human health. A multivariate approach was used to analyse the complex relationships between vegetation characteristics (botanical composition and plant community variables) and chemical composition (proximate constituents and fatty acid profile) in mesophilic and dry vegetation ecological groups, comprising six different semi-natural grassland types in the Western Italian Alps. Mesophilic and dry grasslands were comparable in terms of phenology, biodiversity indices and proportion of botanical families. The content of total fatty acids and that of the most abundant fatty acids (alpha-linolenic, linoleic and palmitic acids) were mainly associated to nutrient-rich plant species, belonging to the mesophilic grassland ecological group. Mesophilic grasslands showed also higher values of crude protein, lower values of fibre content and they were related to higher pastoral values of vegetation compared to dry grasslands. The proximate composition and fatty acid profile appeared mainly single species dependent rather than botanical family dependent. These findings highlight that forage from mesophilic grasslands can provide higher nutritive value for ruminants and may be associated to ruminant-derived food products with a healthier fatty acid profile. © 2016 Society of Chemical Industry. © 2016 Society of Chemical Industry.

  6. Estimation of Mass Balance of the Grosser Aletschgletscher, Swiss Alps, from ICESat Laser Altimetry Data and Digital Elevation Models

    Directory of Open Access Journals (Sweden)

    Jan Kropáček

    2014-06-01

    Full Text Available Traditional glaciological mass balance measurements of mountain glaciers are a demanding and cost intensive task. In this study, we combine data from the Ice Cloud and Elevation Satellite (ICESat acquired between 2003 and 2009 with air and space borne Digital Elevation Models (DEMs in order to derive surface elevation changes of the Grosser Aletschgletscher in the Swiss Alps. Three different areas of the glacier are covered by one nominal ICESat track, allowing us to investigate the performance of the approach under different conditions in terms of ICESat data coverage, and surface characteristics. In order to test the sensitivity of the derived trend in surface lowering, several variables were tested. Employing correction for perennial snow accumulation, footprint selection and adequate reference DEM, we estimated a mean mass balance of −0.92 ± 0.18 m w.e. a−1. for the whole glacier in the studied time period. The resulting mass balance was validated by a comparison with another geodetic approach based on the subtraction of two DEMs for the years 1999 and 2009. It appears that the processing parameters need to be selected depending on the amount of available ICESat measurements, quality of the elevation reference and character of the glacier surface.

  7. Towards the ecotourism: a decision support model for the assessment of sustainability of mountain huts in the Alps.

    Science.gov (United States)

    Stubelj Ars, Mojca; Bohanec, Marko

    2010-12-01

    This paper studies mountain hut infrastructure in the Alps as an important element of ecotourism in the Alpine region. To improve the decision-making process regarding the implementation of future infrastructure and improvement of existing infrastructure in the vulnerable natural environment of mountain ecosystems, a new decision support model has been developed. The methodology is based on qualitative multi-attribute modelling supported by the DEXi software. The integrated rule-based model is hierarchical and consists of two submodels that cover the infrastructure of the mountain huts and that of the huts' surroundings. The final goal for the designed tool is to help minimize the ecological footprint of tourists in environmentally sensitive and undeveloped mountain areas and contribute to mountain ecotourism. The model has been tested in the case study of four mountain huts in Triglav National Park in Slovenia. Study findings provide a new empirical approach to evaluating existing mountain infrastructure and predicting improvements for the future. The assessment results are of particular interest for decision makers in protected areas, such as Alpine national parks managers and administrators. In a way, this model proposes an approach to the management assessment of mountain huts with the main aim of increasing the quality of life of mountain environment visitors as well as the satisfaction of tourists who may eventually become ecotourists. Copyright © 2010 Elsevier Ltd. All rights reserved.

  8. Added value from European Territorial Co-operation: the impact of demographic change in the Alps on the young

    Directory of Open Access Journals (Sweden)

    Marot Naja

    2015-12-01

    Full Text Available The article sets demographic change in the Alps in the framework of European Territorial Cooperation programs. A statistical overview of selected regions in five Alpine countries serves as a basis for further policy analysis. The latter was undertaken to reveal how transnational projects tackle youth issues, including the difficulties within the labour and real estate markets that appeared to be the most problematic factors influencing (out migration of the youth. While there is only a minor recognition of the young in current policymaking on supranational, regional and local levels, the analysis showed that the added value of transnational programs for mountain regions and localities can be recognized in the development of multi-stakeholder environments, creating and transferring new solutions for the labour market as well as empowering youth participation in policy processes. However, the extent to which these solutions might contribute to overcoming the challenges of demographic change because of transnational programs is limited by various factors. Among these are the precise governance framework, administrative capacity, and population figures.

  9. Local and General Monitoring of Forni Glacier (italian Alps) Using Multi-Platform Structure-From Photogrammetry

    Science.gov (United States)

    Scaioni, M.; Corti, M.; Diolaiuti, G.; Fugazza, D.; Cernuschi, M.

    2017-09-01

    Experts from the University of Milan have been investigating Forni Glacier in the Italian alps for decades, resulting in the archive of a cumbersome mass of observed data. While the analysis of archive maps, medium resolution satellite images and DEM's may provide an overview of the long-term processes, the application of close-range sensing techniques offers the unprecedented opportunity to operate a 4D reconstruction of the glacier geometry at both global and local levels. In the latest years the availability of high-resolution DEM's from stereo-photogrammetry (2007) and UAV-photogrammetry (2014 and 2016) has allowed an improved analysis of the glacier ice-mass balance within time. During summer 2016 a methodology to record the local disruption processes has been investigated. The presence of vertical and sub-vertical surfaces has motivated the use of Structure-from-Motion Photogrammetry from ground-based stations, which yielded results comparable to the ones achieved using a long-range terrestrial laser scanner. This technique may be assumed as benchmarking for accuracy assessment, but is more difficult to be operated in high-mountain areas. Nevertheless, the measurement of GCP's for the terrestrial photogrammetric project has revealed to be a complex task, involving the need of a total station a GNSS. The effect of network geometry on the final output has also been investigated for SfM-Photogrammetry, considering the severe limitations implied in the Alpine environment.

  10. Tectonic stress regime in the 2003-2004 and 2012-2015 earthquake swarms in the Ubaye Valley, French Alps

    Science.gov (United States)

    Fojtíková, Lucia; Vavryčuk, Václav

    2018-02-01

    We study two earthquake swarms that occurred in the Ubaye Valley, French Alps within the past decade: the 2003-2004 earthquake swarm with the strongest shock of magnitude ML = 2.7, and the 2012-2015 earthquake swarm with the strongest shock of magnitude ML = 4.8. The 2003-2004 seismic activity clustered along a 9-km-long rupture zone at depth between 3 and 8 km. The 2012-2015 activity occurred a few kilometres to the northwest from the previous one. We applied the iterative joint inversion for stress and fault orientations developed by Vavryčuk (2014) to focal mechanisms of 74 events of the 2003-2004 swarm and of 13 strongest events of the 2012-2015 swarm. The retrieved stress regime is consistent for both seismic activities. The σ 3 principal axis is nearly horizontal with azimuth of 103°. The σ 1 and σ 2 principal axes are inclined and their stress magnitudes are similar. The active faults are optimally oriented for shear faulting with respect to tectonic stress and differ from major fault systems known from geological mapping in the region. The estimated low value of friction coefficient at the faults 0.2-0.3 supports an idea of seismic activity triggered or strongly affected by presence of fluids.

  11. Fabrics produced mimetically during static metamorphism in retrogressed eclogites from the Zermatt-Saas zone, Western Italian Alps

    Science.gov (United States)

    McNamara, D. D.; Wheeler, J.; Pearce, M.; Prior, D. J.

    2012-11-01

    Lattice preferred orientations (LPOs) are commonly interpreted to form by dislocation creep. Consequently they are used to infer deformation at the metamorphic grade at which the minerals were stable, especially if those minerals show a shape fabric. Here we show that LPOs can occur through mimicry of a pre-existing LPO, so they formed statically, not during deformation. Omphacite and glaucophane LPOs occur in eclogite facies rocks from the Zermatt-Saas Unit of the Northwest Italian Alps. Barroisite grew during greenschist facies retrogression and has an LPO controlled significantly by the eclogite facies omphacite and glaucophane LPOs, rather than directly by deformation. Using spatially resolved lattice orientation data from the three key minerals, collected using electron backscatter diffraction, we deploy a new technique of interphase misorientation distribution analysis to prove this. Barroisite LPO develops by mimicry of omphacite (via a particular lattice orientation relationship) and by direct topotactic and epitactic replacement of glaucophane. LPO in turn influenced anisotropic grain growth, resulting in a barroisite grain shape fabric. Thus regional retrogression during exhumation of the Zermatt-Saas high-pressure rocks was, in large part, static, rather than dynamic as previously interpreted. In general the possibility of mimetic fabrics forming during metamorphic reactions must be borne in mind when interpreting direct structural observations and seismic anisotropy data in terms of deformation, in both crust and mantle.

  12. Long-term air monitoring of organochlorine pesticides using Semi Permeable Membrane Devices (SPMDs) in the Alps

    International Nuclear Information System (INIS)

    Levy, W.; Henkelmann, B.; Pfister, G.; Bernhoeft, S.; Kirchner, M.; Jakobi, G.; Bassan, R.; Kraeuchi, N.; Schramm, K.-W.

    2009-01-01

    Atmospheric sampling of organochlorine pesticides (OCPs) was conducted using Semi Permeable Membrane Devices (SPMDs) deployed in the Alps at different altitudinal transects for two consecutive exposure periods of half a year and a third simultaneous year-long period. Along all the altitude profiles, the sequestered amounts of OCPs increased in general with altitude. SPMDs were still working as kinetic samplers after half a year for the majority of the OCPs. However, compounds with the lowest octanol-air partition coefficient (K oa ), reached equilibrium within six months. This change in the SPMD uptake was determined for the temperature gradient along the altitude profile influencing K oa , OCPs availability in the gaseous phase, and SPMD performance. In sum, it seems two effects are working in parallel along the altitude profiles: the change in SPMD performance and the different availability of OCPs along the altitudinal transects determined by their compound properties and concentrations in air. - SPMDs were in different uptake stages regarding OCPs, as they were influenced by the temperature (season, triolein state, and altitude) and K oa .

  13. Understanding Land Cover Changes in the Italian Alps and Romanian Carpathians Combining Remote Sensing and Stakeholder Interviews

    Directory of Open Access Journals (Sweden)

    Žiga Malek

    2014-01-01

    Full Text Available In the last two decades, socio-economic changes in Europe have had a significant effect on land cover changes, but it is unclear how this has affected mountain areas. We focus on two mountain areas: the eastern Italian Alps and the Romanian Curvature Carpathians. We classified land cover from Earth observation data after 1989 by using applied remote sensing techniques. We also analyzed socio-economic data and conducted semi-structured interviews with local stakeholders. In Italy, most of the land conversion processes followed long-term trends. In Romania, they took off with the sudden political changes after 1989. In both areas, forest expansion was the biggest, but potentially not the most consequential change. More consequential changes were urbanization in Italy and small-scale deforestation in Romania, since both increased the risk of hydro-meteorological hazards. Stakeholders’ views were an added value to the spatial analysis and vice versa. For example, stakeholders’ explanations resolved the seeming contradiction of decreased economic activity and increased urbanization (Italian site, as a consequence of secondary home building. Furthermore, spatial analysis revealed that urbanization in Romania was less significant with regard to consequences for the wider human-environment system than many stakeholders thought.

  14. An investigation of the Ora del Garda wind in the Alps by means of kriging of airborne and surface measurements

    Science.gov (United States)

    Laiti, Lavinia; Zardi, Dino; de Franceschi, Massimiliano; Rampanelli, Gabriele

    2013-04-01

    On summer clear-sky days a coupled lake and valley thermally-driven circulation, known as Ora del Garda, arises in the late morning over the northern shorelines of the Lake Garda, in the southeastern Italian Alps, and then channels northward into the Sarca Valley and the Valley of Lakes. After flowing over an elevated saddle, in the early afternoon the Ora del Garda wind breaks out into the nearby Adige Valley, where it mixes with the local up-valley wind, producing a strong and gusty flow in the area. Flights of an instrumented motorglider, exploring specific sections in the valleys where this breeze blows, were performed in order to investigate the fine-scale structure of the Atmospheric Boundary Layer (ABL) associated to the circulation development. A Residual Kriging (RK) mapping technique was applied to the airborne dataset to obtain high-resolution 3D fields of potential temperature and mixing ratio, including also surface observations from automated weather stations disseminated along the valley floor. RK-interpolated fields revealed not only the characteristic vertical structure of the ABL occurring in connection with the Ora del Garda wind, but also fine-scale features of the thermal structure of the valley atmosphere, like a lake-breeze front structure at the shoreline, cross-valley asymmetries due to the presence of a small lake present on the valley floor or to the valley axis curvature, and an hydraulic jump structure in the outflow area.

  15. Adaptation photosynthétique à la température de Pinus cembra dans l'écotone de la limite supérieure de la forêt dans les Alpes centrales autrichiennes

    OpenAIRE

    Wieser, Gerhard; Oberhuber, Walter; Walder, Lisa; Spieler, Daniela; Gruber, Andreas

    2010-01-01

    International audience; Temperature is suggested to determine the upper limit of tree life. Therefore, future climate warming may be of importance for tree distribution within the European Alps, where low temperatures limit carbon metabolism.* We focused on the effects of air and soil temperature on net photosynthesis (Pn) of Pinus cembra an evergreen climax species of the timberline ecotone of the Central Austrian Alps. Light response and temperature response curves were estimated along an a...

  16. Permafrost at its limits: The most easterly evidence of existing permafrost in the European Alps as indicated by ground temperature and geoelectrical measurements

    Science.gov (United States)

    Kellerer-Pirklbauer, A.; Kühnast, B.

    2009-04-01

    Mountain permafrost is a widespread phenomenon in alpine regions in the European Alps. For instance, some 2000 km² or 4% of the Austrian Alps are underlain by permafrost. Up to recent times most research on permafrost issues in Austria focused on the central and highest section of the Austrian Alps. By contrast, knowledge concerning marginal permafrost zones is fairly limited. To increase knowledge about the easternmost limit of permafrost in the European Alps, a research project focusing on the Seckauer Tauern Mountains (14°30'E to 15°00'E) and particularly on the Hochreichart area was initiated in 2004 by the first author. Since then, different methods have been applied such as e.g. geomorphic mapping, numerical permafrost modelling, multi-annual BTS measurements (since 2004) or continuous ground surface and near ground surface temperature measurements by miniature temperature data loggers/MTDs (since 2004). In order to verify the temperature data and to extend the spatial knowledge about permafrost distribution beyond point information, a geoelectrical survey was carried out at the end of August 2008 by applying the electrical resistivity tomography (ERT) method along a 120 m long profile covering the upper part of the rooting zone of a (more-or-less) relict rock glacier and the talus slope above. For this survey the two-dimensional (2D) electrical surveys was performed using the Wenner-Alfa configuration with 2.5 m spacing and an LGM-Lippmann 4-Punkt light hp resistivity-meter. The ERT results indicate an active layer of 2 to 4 m underlain by a permafrost body along 3/4 of the entire profile with resistivity values between 50 to 100 kOhm.m and extending to a depth of 10 to 15 m. The permafrost body is substantially thicker at the lower part of the profile (rock glacier; first 50 m of profile) compared to most of the upper part (talus slope). Focusing on the talus slope, the permafrost body is thickest on the central section of the profile (~5-6 m thickness

  17. Warming and glacier recession in the Rakaia valley, Southern Alps of New Zealand, during Heinrich Stadial 1

    Energy Technology Data Exchange (ETDEWEB)

    Aaron E. Putnam; Joerg M. Schaefe; George H .Denton; DavidJ. A. Barrell; Bjørn G. Andersen; Tobias N.B. Koffman; Ann V. Rowan; Robert C. Finkel; Dylan H. Rood; Roseanne Schwartz; Marcus J. Vandergoes; Mitchell A. Plummer; Simon H. Brocklehurst; Samuel E. Kelley; Kathryn L. Ladig

    2013-11-01

    The termination of the last ice age featured a major reconfiguration of Earth's climate and cryosphere, yet the underlying causes of these massive changes continue to be debated. Documenting the spatial and temporal variations of atmospheric temperature during deglaciation can help discriminate among potential drivers. Here, we present a 10Be surface-exposure chronology and glaciological reconstruction of ice recession following the Last Glacial Maximum (LGM) in the Rakaia valley, Southern Alps of New Zealand. Innermost LGM moraines at Big Ben have an age of 17,840 +/- 240 yrs, whereas ice-marginal moraines or ice-molded bedrock surfaces at distances up-valley from Big Ben of 12.5 km (Lake Coleridge), approximately 25 km (Castle Hill), approximately 28 km (Double Hill), approximately 43 km (Prospect Hill), and approximately 58 km (Reischek knob) have ages of 17,020 +/- 70 yrs, 17,100 +/- 110 yrs, 16,960 +/- 370 yrs, 16,250 +/- 340 yrs, and 15,660 +/- 160 yrs, respectively. These results indicate extensive recession of the Rakaia glacier, which we attribute primarily to the effects of climatic warming. In conjunction with geomorphological maps and a glaciological reconstruction for the Rakaia valley, we use our chronology to infer timing and magnitude of past atmospheric temperature changes. Compared to an overall temperature rise of approximately 4.65?degrees C between the end of the LGM and the start of the Holocene, the glacier recession between approximately 17,840 and approximately 15,660 yrs ago is attributable to a net temperature increase of approximately 4.0?degrees C (from -6.25 to -2.25?degrees C), accounting for approximately 86% of the overall warming. Approximately 3.75?degrees C (approximately 70%) of the warming occurred between approximately 17,840 and approximately 16,250 yrs ago, with a further 0.75?degrees C (approximately 16%) increase between approximately 16,250 and approximately 15,660 yrs ago. A sustained southward shift of the

  18. Infracommunities of intestinal helminths of the Red Fox Vulpes vulpes (Linnaeus, 1758 from Italian Alps

    Directory of Open Access Journals (Sweden)

    Anna Rita Di Cerbo

    2003-10-01

    Full Text Available Vulpes vulpes (Linnaeus, 1758 is one of the most common carnivore in Italy and its spread includes almost the whole national territory. The species shows an high ecological plasticity and a variable diet composition connected in part to human sources. This high adaptability permits the red foxes to colonize different habitats like the suburbs of large cities as well as the small villages located in mountain areas. On the other hand, the tourism pressure seems to assume a great importance in the Alps, also in those areas where the foxes live. So, indirect interactions could take place between these animals and the humans. The role of V. vulpes in the zoonoses has not to be understated since this carnivore could transmit parasitic diseases that are able to cause serious pathologies in humans. This study aims just to investigate on intestinal communities of helmiths of V. vulpes in order to make progress in current knowledge on epidemiological situation in Italian Alps. During 1998-2003, we have examined 450 foxes from Trentino Alto Adige, Veneto, Lombardia and Valle d'Aosta. The specimens collected were found dead or have been hunted (according to national law n. 157/92 in localities situated between 170 and 2200 m a.s.l. The carcasses were carried to the provincial sections of Zooprofilattici Institutes, where the intestine was drawn by each sample and all the material was sent to the Faculty of Veterinary Medicine of Milan. Parasitological examination of the small intestines was performed by the analysis of the whole sediment and counting technique (SCT. Parasites were preserved in alcohol 70° before to be clarified or stained and identified by microscope (Zeiss Axioscop. Mean abundance, mean intensity and prevalence were calculated for each taxon of helminth. Dates of sampling were grouped within the four seasons. Statistic tests were performed with software package SPSS rel. 11.5 and spatial analysis with the

  19. Contrasting environmental memories by ancient soils on different parent rocks in the South-western Italian Alps

    Science.gov (United States)

    D'Amico, Michele; Catoni, Marcella; Bonifacio, Eleonora; Zanini, Ermanno

    2014-05-01

    Ancient soils (pre-Holocenic paleosols and vetusols) are uncommon on the Alps, because of the extensive Pleistocenic glaciations which erased most of the previously existing soils, the slope steepness and climatic conditions favoring soil erosion. However, in few sites, particularly in the outermost sections of the Alpine range, Pleistocene glaciers covered only small and scattered surfaces because of the low altitude reached in the basins, and ancient soils could be preserved for long periods of time on particularly stable surfaces. We described and sampled soils on 11 stable surfaces in the Upper Tanaro valley, Ligurian Alps (Southwestern Piemonte, Italy). The sampling sites were characterized by low steepness and elevation between 600 to 1600 m, under present day lower montane Castanea sativa/Ostrya carpinifolia forests, montane Fagus sylvatica and Pinus uncinata forests or montane heath/grazed grassland, on different substrata. In particular, we sampled soils developed on dolomite, limestone, quartzite, gneiss and shales. The soils were always well representative of the pedogenic trends active on the respective parent materials, i.e. the skeletal fraction in each soil was always composed of just one rock type, despite the proximity of lithological boundaries and the small dimensions of the different outcrops, often coexisting on the same stable surface. All the considered profiles showed signs of extremely long pedogenesis and/or different phases of intense pedogenesis interrupted by the deposition of periglacial cover beds in the steepest sites. Up to four phases of intense pedogenesis were recognized where cover beds were developed, presumably during cold Pleistocene phases, as present-day climate is not cold enough to create such periglacial morphologies. In such cases, each cover bed underwent similar pedogenesis, strongly dependent on the parent material: on quartzite, podzols with thick E horizons and well developed placic ones were formed in all phases

  20. Ductile extension of syn-magmatic lower crusts, with application to volcanic passive margins: the Ivrea Zone (Southern Alps, Italy)

    Science.gov (United States)

    Bidault, Marie; Geoffroy, Laurent; Arbaret, Laurent; Aubourg, Charles

    2017-04-01

    Deep seismic reflection profiles of present-day volcanic passive margins often show a 2-layered lower crust, from top to bottom: an apparently ductile 12 km-thick middle-lower layer (LC1) of strong folded reflectors and a 4 km-thick supra-Moho layer (LC2) of horizontal and parallel reflectors. Those layers appear to be structurally disconnected and to develop at the early stages of margins evolution. A magmatic origin has been suggested by several studies to explain those strong reflectors, favoring mafic sills intrusion hypothesis. Overlying mafic and acidic extrusives (Seaward Dipping Reflectors sequences) are bounded by continentward-dipping detachment faults rooting in, and co-structurated with, the ductile part of the lower crust (LC1). Consequently the syn-rift to post-rift evolution of volcanic passive margins (and passive margins in general) largely depends on the nature and the properties of the lower crust, yet poorly understood. We propose to investigate the properties and rheology of a magma-injected extensional lower crust with a field analogue, the Ivrea Zone (Southern Alps, Italy). The Ivrea Zone displays a complete back-thrusted section of a Variscan continental lower crust that first underwent gravitational collapse, and then lithospheric extension. This Late Paleozoic extension was apparently associated with the continuous intrusion of a large volume of mafic to acid magma. Both the magma timing and volume, and the structure of the Ivrea lower crust suggest that this section represents an adequate analogue of a syn-magmatic in-extension mafic rift zone which aborted at the end of the Permian. Notably, we may recognize the 2 layers LC1 and LC2. From a number of tectonic observations, we reconstitute the whole tectonic history of the area, focusing on the strain field evolution with time, in connection with mafic magma injection. We compare those results with available data from extensional mafic lower crusts at rifts and margins.

  1. Multiproxy analyses of Lake Allos reveal synchronicity and divergence in geosystem dynamics during the Lateglacial/Holocene in the Alps

    Science.gov (United States)

    Cartier, Rosine; Brisset, Elodie; Guiter, Frédéric; Sylvestre, Florence; Tachikawa, Kazuyo; Anthony, Edward J.; Paillès, Christine; Bruneton, Hélène; Bard, Edouard; Miramont, Cécile

    2018-04-01

    Palaeoenvironmental reconstructions of ecosystem responses to external forcing are generally limited by the difficulty of understanding the geosystem as a whole, because of the complex interactions between ecological compartments. Therefore, identifying which geosystem compartments or proxies co-vary is a prerequisite in unravelling the propagation of disturbances (e.g. climatic or anthropogenic) from one compartment to another. A multiproxy study of a continuous 13,500-year sedimentary profile cored in Lake Allos (European Alps, 2200 m a.s.l) was carried out on the basis of high-resolution sedimentological, geochemical, and botanical analyses, as well as determination of aquatic biotic proxies (diatoms, ostracods). These multiproxy datasets are rare at these high altitudes. Major changes occurred in the course of the palaeoenvironmental history of this alpine watershed at 12,000, 8600, 7200 and 3000 cal. BP. During the Holocene, two main transitions were recorded in all the ecological compartments (8600 and 3000 cal. BP), but the period 4500-3000 cal. BP stands out because of major changes that concerned only the lacustrine ecosystem. The frequent switches in lake level might correspond to the 4.2 ka climatic event. Proximity of this alpine lake to climatically-sensitive thresholds (ice-cover, thermal stratification, hydrological balance) may have amplified climatic signals in the lake ecosystem. This study illustrates the difficulties inherent to the use of common intra-Holocene stratigraphical limits, given that ecological compartments are likely to have different responses to forcing factors depending on the characteristics of the watershed and its capacity to accommodate disturbances.

  2. Geometric Reconstruction of Bedrock and Overlying Recent Deposits In An Intra-mountain Basin: The Clusone Basin (southern Alps, Italy)

    Science.gov (United States)

    Caielli, G.; Berra, F.

    Regione Lombardia (Direzione Generale Territorio e Urbanistica) and the National Research Council (CNR-IDPA Milano) acquired seismic reflection profiles in the Clu- sone basin (Middle Val Seriana, Southern Alps). In the study area, the bedrock is rep- resented by late Triassic carbonate units (Formazione di Castro, Dolomia Principale and coeval basinal facies, bordered northward by an important alpine fault) covered by a large amount of recent deposits that covers an area of more than 10 km2, with a maximum thickness of more than two hundreds meters, as documented by available well data. The aim of the seismic prospecting was to identify the sediments layering and the rock basement depth. The acquisition parameters were as follows: group in- terval 10 m; shot interval 5 m; geophone frequency 14 Hz; sample rate 1 ms; record length 2 s, energy source hydrapulse. The cable, with 120 channels, remained dur- ing all the experiment allowing reflection/refraction events acquisition. The data were processed by a standard procedure using PROMAX and SUNT5 processing codes. The statics were calculated starting from the refracted first arrivals using a two layer inversion based on least square optimisation. Standard seismic reflection processing was applied to obtain reflection images and it was integrated with seismic refraction data inversion. Seismic profiles allow to reconstruct both the main reflectors in the recent deposits and the geometry of the bedrock. The first results document a complex history in the drainage patterns of the Clusone basin, allowing to identify, in an intra- mountain basin, drainage directions that in some cases are different from the ones that can be observed today. The integration of well data and seismic profiles in this study of an intra-mountain basin allows on one side the identification of the bedrock geome- tries and, on the other, gives constrains for the reconstruction of the geomorphologic evolution of a sector of a mountain chain.

  3. Participatory Scenario Development to Address Potential Impacts of Land Use Change: An Example from the Italian Alps

    Directory of Open Access Journals (Sweden)

    Žiga Malek

    2015-05-01

    Full Text Available Changes to land use such as the removal of natural vegetation and expansion of urban areas can result in degradation of the landscape and an increase in hydro-meteorological risk. This has led to higher interest by decision-makers and scientists in the future consequences of these drivers. Scenario development can be a useful tool for addressing the high uncertainty regarding modeling future land use changes. Scenarios are not exact forecasts, but images of plausible futures. When studying future land dynamics, emphasis should be given to areas experiencing high rates of socioeconomic change. We have focused on the eastern Italian Alps, which face increasing pressure from tourism development. Identified drivers of local land use change are mostly external and difficult to quantify. This area, characterized by a traditional Alpine landscape, is subject to high levels of hydro-meteorological risk, another reason to study potential future land use changes. We tested a scenario generation method based on existing decisions and assumptions about future tourism development. We aimed to develop a framework leading to plausible scenarios that can overcome data inaccessibility and address external drivers. We combined qualitative methods, such as stakeholder interviews and cognitive mapping, with geospatial methods, such as geographic information systems, geostatistics, and environmental modeling. We involved stakeholders from the beginning to support the steps of generating data, understanding the system of land use change, and developing a land use change model for scenario development. In this way, we generated spatio-temporal scenarios that can assist future spatial planning and improve preparedness for possible undesirable development.

  4. Microphysical properties of snowfall in the Swiss Alps as measured with a Multi-Angle Snowflake Camera

    Science.gov (United States)

    Praz, Christophe; Roulet, Yves-Alain; Berne, Alexis

    2017-04-01

    In solid precipitation, snowfall rate can be estimated from weather radar using relationships between solid hydrometeors microstructure (size, shape, mass) and their scattering properties. These relationships are difficult to estimate and remain largely uncertain, mainly due to the rich variety of shapes, sizes and properties that snowflakes and ice crystals can adopt in the atmosphere. It is therefore essential to document the microstructural properties of individual falling snowflakes in order to better characterize the microphysics of snowfall as well as to improve its quantitative estimation. In this study, we utilized a new supervised classification method applied on pictures recorded with a Multi-Angle Snowflake Camera (MASC) in order to classify observed particles into 6 distinct hydrometeor classes (columnar crystals, planar crystals, combination of columnar and planar crystals, aggregates, graupels and small particles) and estimate their degree of riming on a continuous scale ranging from zero (no riming) to one (graupel). The classification is performed on more than 8 months of MASC data collected in the Swiss Alps. The outcome is in turn used to investigate important microstructural properties of falling snowflakes (particle size, aspect ratio, orientation, fallspeed) and refine the relationships between them (e.g. shape-size, fallspeed-size) as a function of the hydrometeor type and degree of riming. In addition, collocated measurements from a two-dimensional video disdrometer (2DVD) are used to evaluate the accuracy and the uncertainties associated with the MASC fallspeed retrieval system. The two instruments were both located in a Double-Fence Intercomparison Reference (DFIR) during the measurement campaign in a configuration aimed to minimize the influence of wind and ambient turbulence on snowflakes fall velocity.

  5. Debris cover and surface melt at a temperate maritime alpine glacier: Franz Josef Glacier, Southern Alps, New Zealand

    Science.gov (United States)

    Brook, Martin; Hagg, Wilfried; Winkler, Stefan

    2013-04-01

    During the last few years, after three decades of generally positive mass balance, Franz Josef Glacier (Southern Alps, New Zealand) has entered into a phase of strong frontal retreat. This development is combined with significant downwasting of the lower glacier tongue and a concurrent increasing emergence of debris on the surface in the ablation zone. Previously, melt rates at Franz Josef Glacier have only been measured on bare ice, so a short-term study in February 2012 saw a network of 11 ablation stakes drilled into locations of varying supraglacial debris thickness on the lower glacier. Direct ablation measurements were accompanied by observations of air temperatures and mapping of debris thickness and its distribution on the lower glacier tongue in order to calculate the potential effect of reduced overall ablation. Mean ablation rates over 9 days varied over the range 1.2-10.1 cm d-1 and were closely related to debris thickness. Air temperatures provided a strong indicator of daily melt rates and by applying a degree-day approach, a range of degree-day factors between 1.1 and 8.1 mm d-1 °C-1 with a mean of 4.4 mm d-1 °C-1 was obtained. These values are comparable with rates reported in other studies. Mapping of the entire ablation zone revealed an area of 0.7 km2 (or 14.3 %) covered by debris of 1-50 cm thickness. Based on measured debris thicknesses and calculated degree-day factors, ablation on those debris-covered areas of the glacier is reduced by a total of 41%. For the entire ablation zone this equates to a 6% overall reduction in melt. This study highlights the usefulness of short-term surveys to gather representative ablation data.

  6. Brittle/Ductile deformation at depth during continental crust eclogitization (Mont-Emilius klippe, Western Internal Alps).

    Science.gov (United States)

    Hertgen, Solenn; Yamato, Philippe; Morales, Luiz; Angiboust, Samuel

    2016-04-01

    Eclogitic rocks are important for understanding tectonics at large scale as they provide key constraints on both the evolution (P-T-t-ɛ paths) and the deformation modes of the crust along the subduction interface. We herein focus our study on eclogitized mafic dykes remnants exposed within granulites from the continental basement silver of the Mt. Emilius klippe (Western Internal Alps, Italy). These eclogites exhibit highly deformed garnetite and clinopyroxenite levels. In some places, these rocks with a ± mylonitic aspect can be found as clasts within meter-thick brecciated fault rocks formed close to metamorphic peak conditions in eclogite facies. Especially, the garnet-rich levels tend to behave in a brittle fashion while deformation within clinopyroxene-rich levels is mostly accommodated by creep. This is evidenced by the presence of elongated grains, subgrain boundaries and intense grain size reduction close to rigid garnets. Crystallographic preferred orientation (CPO) measurements in garnets indicate a quasi-random distribution. In most of the clinopyroxenes levels nevertheless, the CPO is relatively strong, with multiples of uniform distribution varying from 4 to 5.5 (value of 1 is random texture). This CPO is characterized by a strong alignment of poles (001) parallel to the lineation and (100) and [010] distributed along girdles cross-cutting the foliation plane. Our study thus attests that the materials along the subduction interface at P~2.0-2.5 GPa and T~500-550°C can locally be brittle where deformation is classically envisioned as ductile. In addition to this deformation analysis, we present a petrological study of these eclogites, from the outcrop to the microscopic scale, tracking the chemical evolution associated to the observed deformation. Based on all these data, we finally propose a tectono-metamorphic history for these rocks allowing to explain the co-existence of ductile and brittle features developed in the same metamorphic facies, and

  7. Coexisting of ductile and brittle behaviors at depth during continental crust eclogitization (Mt. Emilius klippe, Western Alps)

    Science.gov (United States)

    Morales, L. F. G.; Yamato, P.; Hertgen, S.; Angiboust, S.

    2015-12-01

    Eclogitic rocks provide key constraints on both the evolution (P-T-t-ɛ paths) and the deformation modes of the crust along the subduction interface and therefore are crucial for the understanding of tectonics at large scale. Here we present some preliminary results of a microstructural study on eclogitized mafic dykes exposed within granulites from the continental basement silver of the Mt. Emilius klippe (Western Internal Alps, Italy). In this region, highly deformed eclogites characterized by a strong layering between garnetite and clinopyroxenite bands is the most predominant feature. These different levels present very heterogeneous deformation patterns, and while the garnet-rich levels tend to have a brittle behavior, the deformation within clinopyroxene-rich levels is possibly accommodated by creep. This is evidenced by the presence of elongated grains, subgrain boundaries and intense grain size reduction close to rigid garnets. Crystallographic preferred orientation (CPO) measurements in garnets indicate a quasi-random distribution. In most of the clinopyroxenes levels nevertheless, the CPO is relatively strong, with multiples of uniform distribution varying from 4 to 5.5 (value of 1 is random texture). This CPO in the clinopyroxenes is characterized by a strong alignment of poles (001) parallel to the lineation and (100) and [010] distributed along girdles cross-cutting the foliation plane. These mylonitic rocks are sometimes found as clasts within meter-thick brecciated fault rocks formed at, or nearly close to, the metamorphic peak in eclogite facies. Therefore, the materials along the subduction interface at these P-T conditions (i.e., ~2.0-2.5 GPa; 500-550°C) can locally be brittle where deformation is classically envisioned as ductile. We propose a model that involves creep deformation, heterogeneous fluid circulation, and local brittle behavior to explain the co-existence of ductile and brittle features developed in the same depth region.

  8. A combined microstructural and petrophysical study to analyse the mechanical behaviour of shales in the Flysch units, Glarus Alps, Switzerland

    Science.gov (United States)

    Akker, Vénice; Kaufmann, Josef; Berger, Alfons; Herwegh, Marco

    2017-04-01

    Crustal scale deformation is strongly controlled by the rheological behaviour of sheet-silicate-rich rock types. As these rocks have low rock strength, facilitated by the strong crystallographically controlled mechanical anisotropy and interstitial pore fluid in the aggregate, they are able to accommodate considerable amounts of strain. A close relationship is expected between microstructure, porosity and permeability as function of metamorphic conditions and strain gradients. Thereby, fluids set free by compaction, mineral reactions or deformation play an important role. Rising industries in underground storage such as nuclear waste disposal, shale gas exploration or geological carbon sequestration make use of the advantageous properties of such rock types. Therefore, there is a great demand for research on the interaction of these processes. This study uses samples from Flysch-units of the Glarus Alps (Switzerland) collected along a metamorphic gradient (150-400°C) to unravel the link between the mechanical behaviour of these sheet-silicate-rich rocks at geological conditions and their present-day physical parameters. Investigations include two topics: (1) characterization of such rock types in terms of mineralogy, microstructure and petrophysical properties; and (2) possible reconstruction of deformation processes from microstructures. Quantitative information on the porosity, i.e. the pore sizes, distribution and their interconnectivity is crucial for both topics. Porosity is therefore estimated by: (1) image analysis of high resolution SEM images, (2) He-pycnometry, and (3) Hg-porosimetry. In a first step, differences in their present day physical parameters between low and high temperature sampling sites are shown. The variations inside and between the investigated samples is partly due to initial sedimentological heterogeneity and partly to the changes along the metamorphic gradient. This study will demonstrate how the characterized present day porosity

  9. Sedimentary record of subsidence pulse at the Triassic/Jurassic boundary interval in the Slovenian Basin (eastern Southern Alps)

    Science.gov (United States)

    Rožič, Boštjan; Jurkovšek, Tea Kolar; Rožič, Petra Žvab; Gale, Luka

    2017-08-01

    In the Alpine Realm the Early Jurassic is characterized by the disintegration and partial drowning of vast platform areas. In the eastern part of the Southern Alps (present-day NW Slovenia), the Julian Carbonate Platform and the adjacent, E-W extending Slovenian Basin underwent partial disintegration, drowning and deepening from the Pliensbachian on, whereas only nominal environmental changes developed on the large Dinaric (Friuli, Adriatic) Carbonate Platform to the south (structurally part of the Dinarides). These events, however, were preceded by an earlier - and as yet undocumented extensional event - that took place near the Triassic/Jurassic boundary. This paper provides evidence of an accelerated subsidence from four selected areas within the Slovenian Basin, which show a trend of eastwardly-decreasing deformation. In the westernmost (Mrzli vrh) section - the Upper Triassic platform-margin - massive dolomite is overlain by the earliest Jurassic toe-of-slope carbonate resediments and further, by basin-plain micritic limestone. Further east (Perbla and Liščak sections) the Triassic-Jurassic transition interval is marked by an increase in resedimented carbonates. We relate this to the increasing inclination and segmentation of the slope and adjacent basin floor. The easternmost (Mt. Porezen) area shows a rather monotonous, latest Triassic-Early Jurassic basinal sedimentation. However, changes in the thickness of the Hettangian-Pliensbachian Krikov Formation point to a tilting of tectonic blocks within the basin area. Lateral facies changes at the base of the formation indicate that the tilting occurred at and/or shortly after the Triassic/Jurassic boundary

  10. Sedimentary record of subsidence pulse at the Triassic/Jurassic boundary interval in the Slovenian Basin (eastern Southern Alps

    Directory of Open Access Journals (Sweden)

    Rožič Boštjan

    2017-08-01

    Full Text Available In the Alpine Realm the Early Jurassic is characterized by the disintegration and partial drowning of vast platform areas. In the eastern part of the Southern Alps (present-day NW Slovenia, the Julian Carbonate Platform and the adjacent, E-W extending Slovenian Basin underwent partial disintegration, drowning and deepening from the Pliensbachian on, whereas only nominal environmental changes developed on the large Dinaric (Friuli, Adriatic Carbonate Platform to the south (structurally part of the Dinarides. These events, however, were preceded by an earlier - and as yet undocumented extensional event - that took place near the Triassic/Jurassic boundary. This paper provides evidence of an accelerated subsidence from four selected areas within the Slovenian Basin, which show a trend of eastwardly-decreasing deformation. In the westernmost (Mrzli vrh section - the Upper Triassic platform-margin - massive dolomite is overlain by the earliest Jurassic toe-of-slope carbonate resediments and further, by basin-plain micritic limestone. Further east (Perbla and Liščak sections the Triassic-Jurassic transition interval is marked by an increase in resedimented carbonates. We relate this to the increasing inclination and segmentation of the slope and adjacent basin floor. The easternmost (Mt. Porezen area shows a rather monotonous, latest Triassic-Early Jurassic basinal sedimentation. However, changes in the thickness of the Hettangian-Pliensbachian Krikov Formation point to a tilting of tectonic blocks within the basin area. Lateral facies changes at the base of the formation indicate that the tilting occurred at and/or shortly after the Triassic/Jurassic boundary

  11. Spatial and Temporal Variabilities of Solar and Longwave Radiation Fluxes below a Coniferous Forest in the French Alps

    Science.gov (United States)

    Sicart, J. E.; Ramseyer, V.; Lejeune, Y.; Essery, R.; Webster, C.; Rutter, N.

    2017-12-01

    At high altitudes and latitudes, snow has a large influence on hydrological processes. Large fractions of these regions are covered by forests, which have a strong influence on snow accumulation and melting processes. Trees absorb a large part of the incoming shortwave radiation and this heat load is mostly dissipated as longwave radiation. Trees shelter the snow surface from wind, so sub-canopy snowmelt depends mainly on the radiative fluxes: vegetation attenuates the transmission of shortwave radiation but enhances longwave irradiance to the surface. An array of 13 pyranometers and 11 pyrgeometers was deployed on the snow surface below a coniferous forest at the CEN-MeteoFrance Col de Porte station in the French Alps (1325 m asl) during the 2017 winter in order to investigate spatial and temporal variabilities of solar and infrared irradiances in different meteorological conditions. Sky view factors measured with hemispherical photographs at each radiometer location were in a narrow range from 0.2 to 0.3. The temperature of the vegetation was measured with IR thermocouples and an IR camera. In clear sky conditions, the attenuation of solar radiation by the canopy reached 96% and its spatial variability exceeded 100 W m-2. Longwave irradiance varied by 30 W m-2 from dense canopy to gap areas. In overcast conditions, the spatial variabilities of solar and infrared irradiances were reduced and remained closely related to the sky view factor. A simple radiative model taking into account the penetration through the canopy of the direct and diffuse solar radiation, and isotropic infrared emission of the vegetation as a blackbody emitter, accurately reproduced the dynamics of the radiation fluxes at the snow surface. Model results show that solar transmissivity of the canopy in overcast conditions is an excellent proxy of the sky view factor and the emitting temperature of the vegetation remained close to the air temperature in this typically dense Alpine forest.

  12. Quantifying the Variation in Shear Zone Character with Depth: a Case Study from the Simplon Shear Zone, Central Alps

    Science.gov (United States)

    Cawood, T. K.; Platt, J. P.

    2017-12-01

    A widely-accepted model for the rheology of crustal-scale shear zones states that they comprise distributed strain at depth, in wide, high-temperature shear zones, which narrow to more localized, high-strain zones at lower temperature and shallower crustal levels. We test and quantify this model by investigating how the width, stress, temperature and deformation mechanisms change with depth in the Simplon Shear Zone (SSZ). The SSZ marks a major tectonic boundary in the central Alps, where normal-sense motion and rapid exhumation of the footwall have preserved evidence of older, deeper deformation in rocks progressively further into the currently-exposed footwall. As such, microstructures further from the brittle fault (which represents the most localized, most recently-active part of the SSZ) represent earlier, higher- temperature deformation from deeper crustal levels, while rocks closer to the fault have been overprinted by successively later, cooler deformation at shallower depths. This study uses field mapping and microstructural studies to identify zones representing deformation at various crustal levels, and characterize each in terms of zone width (representing width of the shear zone at that time and depth) and dominant deformation mechanism. In addition, quartz- (by Electron Backscatter Diffraction, EBSD) and feldspar grain size (measured optically) piezometry are used to calculate the flow stress for each zone, while the Ti-in-quartz thermometer (TitaniQ) is used to calculate the corresponding temperature of deformation. We document the presence of a broad zone in which quartz is recrystallized by the Grain Boundary Migration (GBM) mechanism and feldspar by Subgrain Rotation (SGR), which represents the broad, deep zone of deformation occurring at relatively high temperatures and low stresses. In map view, this transitions to successively narrower zones, respectively characterized by quartz SGR and feldspar Bulge Nucleation (BLG); quartz BLG and brittle

  13. Granulites and charnockites of the Gruf Complex: Evidence for Permian ultra-high temperature metamorphism in the Central Alps

    Science.gov (United States)

    Galli, A.; Le Bayon, B.; Schmidt, M. W.; Burg, J.-P.; Caddick, M. J.; Reusser, E.

    2011-05-01

    We present a detailed field and petrological study of charnockites and ultra-high temperature (UHT) granulites from the Gruf Complex, eastern Central Alps. Charnockites occur as up to 0.5 km wide and 8 km long, internally boudinaged, opx-bearing sheet-like bodies within the regionally dominant migmatitic biotite-orthogneisses. Granulites occur as garnet-orthopyroxene-biotite-alkali feldspar-bearing schlieren (± sapphirine, sillimanite, cordierite, corundum, spinel, plagioclase, and quartz) within charnockites and as residual enclaves both in the charnockites and the migmatitic orthogneisses. Thermobarometric calculations, P-T pseudosections and orthopyroxene Al content, show that both charnockites and granulites equilibrated at metamorphic peak conditions of T = 920-940 °C and P = 8.5-9.5 kbar. Peak assemblages were subsequently overprinted by intergrowth, symplectite and corona textures involving orthopyroxene, sapphirine, cordierite and spinel at T = 720-740 °C and P = 7-7.5 kbar. We suggest that granulites and charnockites are lower crustal relicts preserved in the migmatitic orthogneisses. Garnet diffusion modelling shows that metamorphic garnet-opx ± sapphirine ± sillimanite peak assemblages and post-peak reaction textures always involving cordierite developed during two separate metamorphic cycles. Peak assemblages reflect UHT metamorphism related to post-Varican Permian extension, but post-peak coronae and symplectites formed during the mid-Tertiary, upper amphibolite facies, Alpine regional metamorphism. Fluid-absent partial melting of pelitic and psammitic sediments during the Permian UHT event lead to the formation of charnockitic magmas and granulitic residues. Intense melt loss and thorough dehydration of the granulites (although retaining biotite) favoured the partial preservation of peak mineral assemblages during Alpine metamorphism.

  14. Statistical analysis and trends of wet snow avalanches in the French Alps over the period 1959-2010

    Science.gov (United States)

    Naaim, Mohamed

    2017-04-01

    Since an avalanche contains a significant proportion of wet snow, its characteristics and its behavior change significantly (heterogeneous and polydisperse). Even if on a steep given slope, wet snow avalanches are slow. They can flow over gentle slopes and reach the same extensions as dry avalanches. To highlight the link between climate warming and the proliferation of wet snow avlanches, we crossed two well-documented avalanche databases: the permanent avalanche chronicle (EPA) and the meteorological re-analyzes. For each avalanche referenced in EPA, a moisture index I is buit. It represents the ratio of the thickness of the wet snow layer to the total snow thickness, at the date of the avalanche on the concerned massif at 2400 m.a.s.l. The daily and annual proportion of avalanches exceeding a given threshold of I are calculated for each massif of the French alps. The statistical distribution of wet avalanches per massif is calculated over the period 1959-2009. The statistical quantities are also calculated over two successive periods of the same duration 1959-1984 and 1984-2009, and the annual evolution of the proportion of wet avalanches is studied using time-series tools to detect potential rupture or trends. This study showed that about 77% of avalanches on the French alpine massif mobilize dry snow. The probability of having an avalanche of a moisture index greater than 10 % in a given year is 0.2. This value varies from one massif to another. The analysis between the two successive periods showed a significant growth of wet avalanches on 20 massifs and a decrease on 3 massifs. The study of time-series confirmed these trends, which are of the inter-annual variability level.

  15. Mantle wedge exhumation beneath the Dora-Maira (U)HP dome unravelled by local earthquake tomography (Western Alps)

    Science.gov (United States)

    Solarino, Stefano; Malusà, Marco G.; Eva, Elena; Guillot, Stéphane; Paul, Anne; Schwartz, Stéphane; Zhao, Liang; Aubert, Coralie; Dumont, Thierry; Pondrelli, Silvia; Salimbeni, Simone; Wang, Qingchen; Xu, Xiaobing; Zheng, Tianyu; Zhu, Rixiang

    2018-01-01

    In continental subduction zones, the behaviour of the mantle wedge during exhumation of (ultra)high-pressure [(U)HP] rocks provides a key to distinguish among competing exhumation mechanisms. However, in spite of the relevant implications for understanding orogenic evolution, a high-resolution image of the mantle wedge beneath the Western Alps is still lacking. In order to fill this gap, we perform a detailed analysis of the velocity structure of the Alpine belt beneath the Dora-Maira (U)HP dome, based on local earthquake tomography independently validated by receiver function analysis. Our results point to a composite structure of the mantle wedge above the subducted European lithosphere. We found that the Dora-Maira (U)HP dome lays directly above partly serpentinized peridotites (Vp 7.5 km/s; Vp/Vs = 1.70-1.72), documented from 10 km depth down to the top of the eclogitized lower crust of the European plate. These serpentinized peridotites, possibly formed by fluid release from the subducting European slab to the Alpine mantle wedge, are juxtaposed against dry mantle peridotites of the Adriatic upper plate along an active fault rooted in the lithospheric mantle. We propose that serpentinized mantle-wedge peridotites were exhumed at shallow crustal levels during late Eocene transtensional tectonics, also triggering the rapid exhumation of (U)HP rocks, and were subsequently indented under the Alpine metamorphic wedge in the early Oligocene. Our findings suggest that mantle-wedge exhumation may represent a major feature of the deep structure of exhumed continental subduction zones. The deep orogenic levels here imaged by seismic tomography may be exposed today in older (U)HP belts, where mantle-wedge serpentinites are commonly associated with coesite-bearing continental metamorphic rocks.

  16. Geographical distance and physical barriers shape the genetic structure of Eurasian red squirrels (Sciurus vulgaris) in the Italian Alps.

    Science.gov (United States)

    Trizio, I; Crestanello, B; Galbusera, P; Wauters, L A; Tosi, G; Matthysen, E; Hauffe, H C

    2005-02-01

    Red squirrels (Sciurus vulgaris) are widely distributed throughout Eurasia, occurring in many types of coniferous and mixed-deciduous forests. In fragmented landscapes, small and partly isolated populations with low immigration rates show reduced genetic diversity, but reforestation can increase gene flow and restore levels of genetic variation in a few decades. No studies have so far investigated the genetic structure of red squirrel in large, continuous forests. The Italian Alps are presently characterized by almost continuous, recently reconnected forest habitats, that were affected by deep landscape changes during last glaciations but remained mostly unchanged between 10 000 and 200 years bp, when forest cover was heavily reduced. In this study we analyse patterns of genetic variability of red squirrels in and between seven sites distributed over 250 km of Alpine habitat, using mitochondrial DNA (mtDNA) and microsatellites. We use isolation-by-distance (IBD) models to investigate the relative importance that past (Pleistocene glaciations) and recent (fragmentation, bottlenecks) events had on the present genetic situation. Both nuclear and mtDNA data indicate a significant differentiation among study sites and a significant correlation between genetic and geographical distance only over a large scale. No recent bottlenecks are recorded through microsatellites and demographic models strongly support equilibrium between gene flow and drift; however, mtDNA suggests that there may have been local demographic crashes, probably in correspondence with the 19th-century forest fragmentation. These findings indicate that local landscape factors other than geographical distance per se, such as barriers of unsuitable habitat, affect gene flow and determine differentiation.

  17. Landsliding and sediment flux in the Central Swiss Alps: A photogrammetric study of the Schimbrig landslide, Entlebuch

    Science.gov (United States)

    Schwab, Marco; Rieke-Zapp, Dirk; Schneider, Heinz; Liniger, Markus; Schlunegger, Fritz

    2008-05-01

    This study explores the effects of hillslope mass failure on the sediment flux in the Waldemme drainage basin, Central Swiss Alps, over decadal time scales. This area is characterized by abundant landslides affecting principally flysch units and is therefore an important sediment source. The analysis concentrates on the Schimbrig landslide that potentially contributes up to 15% to the sediment budget of the Waldemme drainage basin. Volumetric changes are quantified using high-resolution elevation models that were extracted using digital photogrammetric techniques. Sediment discharge data were used to constrain the significance of the landslide for sediment flux in the channel network. The temporal extent of the photogrammetric analysis ranges from 1962 to 1998, including an earth slide event in 1994. The analyses reveal that during periods of low slip rates of the landslide, nearly all of the displaced sediments were eroded and supplied to the channel network. In contrast, during active periods, only a fraction of the displaced landslide mass was exported to the trunk stream. Interestingly, the 1994 earth slide event did not disturb the long-term sediment discharge pattern of the channel network, nor did it influence the sediment flux at a weekly scale. However, suspended sediment pulses correlate with higher-than-average precipitation events. This was especially the case in August 2005 when a storm event (> 100 years return period) triggered several debris flows and earth flows in the whole drainage basin and in the Schimbrig area. This storm did not result in a significant increase in the slip rates of the entire landslide's main body. It is therefore proposed that debris flows and earth flows perform the connectivity between hillslope processes (e.g. landsliding) and the trunk stream during and between phases of landslide activity in this particular setting.

  18. Sedimentary connection between rock glaciers and torrential channels: definition, inventory and quantification from a test area in the south-western Swiss Alps

    Science.gov (United States)

    Kummert, Mario; Barboux, Chloé; Delaloye, Reynald

    2017-04-01

    Permafrsot creep is an important sediment transfer process in periglacial alpine hillslopes (Delaloye et al. 2010). Rock glaciers are the visible expression of mountain permafrost creep (Delaloye 2004). Large volumes of rock debris originating from headwalls, moraines and weathering deposits are slowly transported within rock glaciers from their rooting zone to their fronts. In the Alps, most rock glaciers can be considered as sediment traps, because the sediment output at their margin is usually limited (Gärtner-Roer 2012). However, cases of rock glacier supplying torrential channels with sediments have been documented (e.g. Lugon and Stoffel 2010, Delaloye et al. 2013) Such rock glaciers can act as a sediment source for the triggering of gravitational processes propagating further downstream. Moreover, in such configuration the amount of sediment available is not a finite volume but is gradually renewed or increased as the rock glacier advances. These cases are therefore very specific, especially in the perspective of natural hazards assessment and mitigation. However, in the Alps very little is known about such type of rock glaciers. In addition, the sediment transfer rates between the fronts of the rock glaciers and the torrents are often not known. In this context, our study aims at (i) defining better the configurations in which a sedimentary connection exists between rock glaciers and torrential channels, (ii) localizing the cases of active rock glaciers connected to the torrential network and (iii) estimating approximate sediment transfer rates between the fronts and the torrential gullies. For that purpose, an inventory method for the classification of torrential catchments based on the analysis of aerial images and the computation of connectivity indexes have been developped. In addition, sediment transfer rates were estimated taking into account the geometry of the frontal areas and the velocity rates of the rock glaciers derived from DInSAR data. In

  19. Parameterization of a numerical 2-D debris flow model with entrainment: a case study of the Faucon catchment, Southern French Alps

    Directory of Open Access Journals (Sweden)

    H. Y. Hussin

    2012-10-01

    Full Text Available The occurrence of debris flows has been recorded for more than a century in the European Alps, accounting for the risk to settlements and other human infrastructure that have led to death, building damage and traffic disruptions. One of the difficulties in the quantitative hazard assessment of debris flows is estimating the run-out behavior, which includes the run-out distance and the related hazard intensities like the height and velocity of a debris flow. In addition, as observed in the French Alps, the process of entrainment of material during the run-out can be 10–50 times in volume with respect to the initially mobilized mass triggered at the source area. The entrainment process is evidently an important factor that can further determine the magnitude and intensity of debris flows. Research on numerical modeling of debris flow entrainment is still ongoing and involves some difficulties. This is partly due to our lack of knowledge of the actual process of the uptake and incorporation of material and due the effect of entrainment on the final behavior of a debris flow. Therefore, it is important to model the effects of this key erosional process on the formation of run-outs and related intensities. In this study we analyzed a debris flow with high entrainment rates that occurred in 2003 at the Faucon catchment in the Barcelonnette Basin (Southern French Alps. The historic event was back-analyzed using the Voellmy rheology and an entrainment model imbedded in the RAMMS 2-D numerical modeling software. A sensitivity analysis of the rheological and entrainment parameters was carried out and the effects of modeling with entrainment on the debris flow run-out, height and velocity were assessed.

  20. Changes in the relationships between climate and silver fir (Abies alba Mill.) growth during the 20th century in the Tuscan Apennine Alps (Middle Italy)

    Science.gov (United States)

    D'Aprile, F.; Tapper, N.; Baker, P.; Bartolozzi, L.; Bottacci, A.

    2012-04-01

    In the Tuscan Apennine Alps, recent research has shown that similarity in trends of monthly climate variables (i.e., temperature and rainfall) is non-stationary amongst sites during the 20th century even between sites that differ little in elevation and at a relatively short distance from each other (D'Aprile et al., 2010; D'Aprile et al., 2011). Moreover, the level of correlation between series of monthly climate variables varies irregularly from highly positive to negative over time. We hypothesised that those changing climate conditions, even at the local level, could cause different tree-ring growth responses in silver fir amongst sites. The hypothesis was tested by dendroclimatological analysis, which was applied to study stands in silver fir forests close to the meteorological stations where climate analysis has been made. Results show that the influences of both monthly mean temperature and monthly rainfall on silver fir growth vary greatly during the 20th century in the Tuscan Apennine Alps, and the ways that they change differ with month and amongst sites. Within sites, differences in the relationships between climate variables and silver fir tree-ring growth appear small in spite of different elevation of the study stands. These results contribute a changing point in forest planning and management especially in consideration of the need to adapt forest management and interventions to changing climate conditions and mitigate the impacts on silver fir forests. Moreover, they introduce climate variability as a key parameter in sustainable forest management for biodiversity conservation, socially responsible uses, nature conservation, and survival of the only conifer tree species typical of mountain mixed forest ecosystems in the Apennine Alps.

  1. The challenges of long-term ecological research in springs in the northern and southern Alps: indicator groups, habitat diversity, and medium-term change

    Directory of Open Access Journals (Sweden)

    Sofia WIEDENBRUG

    2011-09-01

    Full Text Available After extensive exploratory investigations into crenic habitats at the beginning of the 1990s, a number of springs were selected and long-term ecological research programmes independently initiated in the Berchtesgaden National Park (north-eastern Alps, Bavaria and the Adamello-Brenta Nature Park (south-eastern Alps, Trentino. Following more than a decade of standardized work, this paper presents a selection of results from both sides of the Alps, with a focus on zoobenthos in Bavaria and on pro- and eukaryotic algae in Trentino. In order to test the assumption that permanent springs are particularly suitable habitats for long-term ecological research, the following topics are addressed: (1 taxonomic diversity and relationships between diversity and spring typology; (2 transverse gradients in crenic habitats, hygrophilous terrestrial invertebrates and xerotolerant algae; (3 possibilities of documenting changes in species composition over decadal time scales ("medium-term" based on emergence traps, benthos, and benthic algae. The data obtained show that: (1 crenic habitats support particularly high biological diversity (but a thorough documentation of insect diversity is impossible without emergence studies; (2 helocrenes are the most species-rich habitats, for both invertebrates and diatoms; (3 dynamic (unstable and occasionally-impacted springs show identifiable signs of medium-term change, whilst particularly complex and stable crenic habitats seem to be controlled by internal processes. Our results suggest that: (1 the meiofauna is likely to react directly to environmental change, while emergers and the hygrophilous terrestrial fauna are indirectly affected, and (2 diatoms react both to direct effects of environmental change, e.g. discharge and hydrochemistry, and to indirect effects on the surroundings of the spring. Based on our results, long-term research strategies are discussed. For long-term studies, we propose a focus on meiofauna and

  2. AL:PE - Acidification of Mountain Lakes: Palaeolimnology and Ecology. Part 2 - Remote Mountain Lakes as Indicators of Air Pollution and Climate Change

    Energy Technology Data Exchange (ETDEWEB)

    Wathne, Bente M.; Patrick, Simon; Cameron, Nigel [eds.

    1997-07-01

    AL:PE is a multi-disciplinary and multi-national project coordinated by research groups in London and Oslo. It is funded by the European Commission, The project is described in this report. The project is the first comprehensive study of remote mountain lakes on a European scale. It is concerned with ecosystems in the arctic and alpine regions of Europe that are threatened by acid deposition, toxic air pollutants and climatic change despite their remoteness. The studies are important not only for ecosystems of the lakes, for which they were designed, but for the arctic and alpine regions in general, since the lakes with their sediment records act as environmental sensors. The AL:PE results illustrate two overarching issues: (1) the importance of these remote and sensitive ecosystems as sensors of long-range transported pollutants and as providers of early warning signals for more widespread environmental change; and (2) the importance and urgency of understanding the present and future impact of pollutants, both singly and in combination, on aquatic ecosystems. Currently, acid deposition is considered the most potent threat. In the context of global warming, however, it is a formidable scientific challenge to disentangle the interactions between the effects of changing deposition patterns of acids, nutrients, trace metals and trace organics. The AL:PE programme has begun to address this challenge and its successor EU project, MOLAR, is designed to tackle the issues more more specifically by focusing on in-depth studies of key sites. 97 refs., 192 figs., 100 tabs.

  3. Alpine glacial relict species losing out to climate change: The case of the fragmented mountain hare population (Lepus timidus) in the Alps.

    Science.gov (United States)

    Rehnus, Maik; Bollmann, Kurt; Schmatz, Dirk R; Hackländer, Klaus; Braunisch, Veronika

    2018-03-13

    Alpine and Arctic species are considered to be particularly vulnerable to climate change, which is expected to cause habitat loss, fragmentation and-ultimately-extinction of cold-adapted species. However, the impact of climate change on glacial relict populations is not well understood, and specific recommendations for adaptive conservation management are lacking. We focused on the mountain hare (Lepus timidus) as a model species and modelled species distribution in combination with patch and landscape-based connectivity metrics. They were derived from graph-theory models to quantify changes in species distribution and to estimate the current and future importance of habitat patches for overall population connectivity. Models were calibrated based on 1,046 locations of species presence distributed across three biogeographic regions in the Swiss Alps and extrapolated according to two IPCC scenarios of climate change (RCP 4.5 & 8.5), each represented by three downscaled global climate models. The models predicted an average habitat loss of 35% (22%-55%) by 2100, mainly due to an increase in temperature during the reproductive season. An increase in habitat fragmentation was reflected in a 43% decrease in patch size, a 17% increase in the number of habitat patches and a 34% increase in inter-patch distance. However, the predicted changes in habitat availability and connectivity varied considerably between biogeographic regions: Whereas the greatest habitat losses with an increase in inter-patch distance were predicted at the southern and northern edges of the species' Alpine distribution, the greatest increase in patch number and decrease in patch size is expected in the central Swiss Alps. Finally, both the number of isolated habitat patches and the number of patches crucial for maintaining the habitat network increased under the different variants of climate change. Focusing conservation action on the central Swiss Alps may help mitigate the predicted effects of

  4. The Grand St Bernard-Briançonnais Nappe System and the Paleozoic Inheritance of the Western Alps Unraveled by Zircon U-Pb Dating

    Science.gov (United States)

    Bergomi, M. A.; Dal Piaz, G. V.; Malusà, M. G.; Monopoli, B.; Tunesi, A.

    2017-12-01

    The continental crust involved in the Alpine orogeny was largely shaped by Paleozoic tectono-metamorphic and igneous events during oblique collision between Gondwana and Laurussia. In order to shed light on the pre-Alpine basement puzzle disrupted and reamalgamated during the Tethyan rifting and the Alpine orogeny, we provide sensitive high-resolution ion microprobe U-Pb zircon and geochemical whole rock data from selected basement units of the Grand St Bernard-Briançonnais nappe system in the Western Alps and from the Penninic and Lower Austroalpine units in the Central Alps. Zircon U-Pb ages, ranging from 459.0 ± 2.3 Ma to 279.1 ± 1.1 Ma, provide evidence of a complex evolution along the northern margin of Gondwana including Ordovician transtension, Devonian subduction, and Carboniferous-to-Permian tectonic reorganization. Original zircon U-Pb ages of 371 ± 0.9 Ma and 369.3 ± 1.5 Ma, from calc-alkaline granitoids of the Grand Nomenon and Gneiss del Monte Canale units, provide the first compelling evidence of Late Devonian orogenic magmatism in the Alps. We propose that rocks belonging to these units were originally part of the Moldanubian domain and were displaced toward the SW by Late Carboniferous strike-slip faulting. The resulting assemblage of basement units was disrupted by Permian tectonics and by Mesozoic opening of the Alpine Tethys. Remnants of the Moldanubian domain became either part of the European paleomargin (Grand Nomenon unit) or part of the Adriatic paleomargin (Gneiss del Monte Canale unit), to be finally accreted into the Alpine orogenic wedge during the Cenozoic.

  5. Seismically-triggered soft-sediment deformation structures close to a major strike-slip fault system in the Eastern Alps (Hirlatz cave, Austria)

    Science.gov (United States)

    Salomon, Martina Lan; Grasemann, Bernhard; Plan, Lukas; Gier, Susanne; Schöpfer, Martin P. J.

    2018-05-01

    We investigate episodic soft-sediment deformation structures cross-cut by normal faults preserved in unlithified finely laminated calcite rich sediments in the Hirlatz cave in the Northern Calcareous Alps (Austria). These sediments comprise varve-like alternations of brighter carbonate/quartz rich layers, and darker clay mineral rich layers. The deformed sediments contain abundant millimeter to centimeter-scale soft-sediment structures (load casts, ball-and-pillow structures), sheet slumps (thrust faults and folds), erosive channels filled with slides and chaotic slumps. After deposition and soft-sediment deformation normal faults developed within the entire sedimentary succession, an event that probably correlates with an offset of c. 10 cm of the passage wall above the outcrop. Our major conclusions are: (i) The sediments have a glacial origin and were deposited in the Hirlatz cave under phreatic fluvio-lacustrine conditions. The deposition and the soft-sediment deformation occurred most likely during the last glaciation (i.e. around 25 ka ago); (ii) The liquefaction and formation of the soft-sediment structures in water-saturated stratified layers was triggered by episodic seismic events; (iii) The internally deformed sediments were later displaced by normal faults; (iv) A possible source for the seismic events is the active sinistral Salzach-Ennstal-Mariazeller-Puchberger (SEMP) strike-slip fault which is located about 10 km south of the outcrop and plays a major role in accommodating the extrusion of the Eastern Alps towards the Pannonian Basin. To our knowledge, the described structures are the first report of liquefaction and seismically induced soft-sediment deformations in Quaternary sediments in the Eastern Alps.

  6. Large-scale biotic interaction effects - tree cover interacts with shade toler-ance to affect distribution patterns of herb and shrub species across the Alps

    DEFF Research Database (Denmark)

    Nieto-Lugilde, Diego; Lenoir, Jonathan; Abdulhak, Sylvain

    2012-01-01

    , we simulated a removal experiment by comparing the elevational distribution of each species under high and low tree cover. Tree cover improved model performances and species’ response curves to a tree cover gradient varied depending on their shade tolerance, supporting the hypothesized antagonistic...... distributions has scarcely been investigated. Here, we used species distribution modeling (SDM) to assess the effect of tree cover on the elevational range limits of 1,378 herb and shrub species across the Alps, based on 18,798 vegetation plots. We hypothesize that tree cover will have a negative effect...

  7. U.S. Assessment of advanced limiter-divertor plasma-facing systems (ALPS) design, analysis, and R and D needs

    International Nuclear Information System (INIS)

    Mattas, R. F.

    1998-01-01

    The purpose of the ALPS program is to identify and evaluate advanced limiter/diverter systems that will enhance the attractiveness of fusion power. The highest priority goals at present are achieving high power density, up to 50 MW/m 2 , and showing compatibility of plasma-facing surfaces with plasma operation. Personnel representing a wide range of disciplines from a number of institutions are engaged in the program, where an evaluation phase of the program is planned for three years. Successful identification of promising concepts in the evaluation phase should lead to an R and D phase that includes proof-of-principle experiments

  8. Single- and multi-foils {sup 27}Al(p,3pn){sup 24}Na activation technique for monitoring the intensity of high-energy beams

    Energy Technology Data Exchange (ETDEWEB)

    Curioni, A. [CERN, 1211 Geneva 23 (Switzerland); Politecnico di Milano, Department of Energy, 20156 Milan (Italy); Froeschl, R.; Glaser, M. [CERN, 1211 Geneva 23 (Switzerland); Iliopoulou, E. [CERN, 1211 Geneva 23 (Switzerland); Medical Physics Laboratory, School of Medicine, Aristotle University of Thessaloniki (Greece); La Torre, F.P. [CERN, 1211 Geneva 23 (Switzerland); Pozzi, F., E-mail: fabio.pozzi@cern.ch [CERN, 1211 Geneva 23 (Switzerland); Ravotti, F.; Silari, M. [CERN, 1211 Geneva 23 (Switzerland)

    2017-06-21

    This paper discusses an experimental study of the spallation reaction {sup 27}Al(p,3pn){sup 24}Na in Al foils exposed to 24 GeV c{sup −1} protons, in the context of monitoring the intensity of multi-GeV proton beams through foil activation techniques. Since this reaction is sensitive to secondary neutrons and other energetic secondary hadrons, it is important to evaluate the impact of the foil thickness on the calculation of the beam intensity. This effect is determined experimentally using a stack of Al foils of varying thickness. The experimental results are then compared to Monte Carlo simulations.

  9. Comparison Of Net Ecosystem CO{sub 2} Exchange Of An Extensively Used Grassland And A Protected Wetland In The Swiss Alps

    Energy Technology Data Exchange (ETDEWEB)

    Rogiers, N.; Eugster, W. [ETH Zuerich (Switzerland); Furger, M.

    2005-03-01

    CO{sub 2} and H{sub 2}O vapour fluxes were measured with the eddy covariance method at a grassland in the Swiss central Alps. The impact of agricultural management on the CO{sub 2} and H{sub 2}O exchange is shown by comparing the fluxes measured at an extensively used area and a protected site. Whereas the CO{sub 2} fluxes where completely disturbed by the grass cut, the water vapour fluxes remained more or less unchanged. (author)

  10. Comparison of the eight weeks of supplementation Creatine and Glutamine consumption along with resistance exercise on the level of ALP in female mice

    Directory of Open Access Journals (Sweden)

    A eskandari

    2015-11-01

    Full Text Available Background and purpose: in recent years, in order to improve power, speed, the increase in the volume of the musculature, preventing sports injuries and maintain the muscle performance athletes use from different resistance exercises and food supplements. In this regard, present study has been conducted with the aim of comparison the influence of an 8 week period consumption of creatine (2 gr.kg-1.day-1 in 1st week and 0.48 gr.kg-1.day-1during 2nd to 8th weeks and glutamine (1 gr.kg-1.day-1 from first to eighth weeks along with resistance exercise on level of ALP of female mice. Materials and methods: This experimental study was done on 80 Small adult female mice of Surrey species (28 ± 5 gram. The animals were randomly divided into 8 groups of: resistance exercise, resistance exercise + creatine, resistance exercise + glutamine, resistance exercise + glutamine + creatine, creatine, glutamine, creatine + glutamine and control groups (N= 10. Resistance exercise (5 days a week was including: climbing (4 sets, 5 times repetition with two minutes rest between the sets from a ladder (with the height of one meter and including 26 steps and bearing 30 percent of the weight of the Mouse body (hanging from tail in the first week and the increasing it up to 200 percent of body weight till the last week of the experiment. During 48 hours after the last practice session of resistance exercise, the blood sample was taken and the the level of ALP has been measured. Findings:The results showed that the level of ALP enzyme in creatine + glutamine + resistance exercise groug had been increased in comparison with the control group (144.3 ± 15.86 in comparison with 234.7 ± 25.69 U.L-1 P < 0.05. Conclusion: The results of this research indicate Creatine and Glutamine supplementation consumption along with resistance exercise increases in the level of ALP enzyme in the liver of mice.

  11. Holocene temperature variations at a high-altitude site in the Eastern Alps: a chironomid record from Schwarzsee ob Sölden, Austria

    Science.gov (United States)

    Ilyashuk, Elena A.; Koinig, Karin A.; Heiri, Oliver; Ilyashuk, Boris P.; Psenner, Roland

    2011-01-01

    Few well-dated, quantitative Holocene temperature reconstructions exist from high-altitude sites in the Central Eastern Alps. Here, we present a chironomid-based quantitative reconstruction of mean July air temperatures (TJuly) throughout the Holocene for a remote high-mountain lake, Schwarzsee ob Sölden, situated above the treeline at 2796 m a.s.l. in the Austrian Alps. Applying a chironomid-temperature inference model developed from lakes of the Alpine region to a high-resolution chironomid record from the lake provides evidence for early Holocene (ca 10000–8600 cal yr BP) TJuly of up to 8.5 °C, i.e. >4 °C above the modern (1977–2006) mean July temperature. The reconstruction reveals the so-called ‘8.2-ka cold event’ centered at ca 8250–8000 cal yr BP with temperatures ca 3 °C below the early-Holocene thermal maximum. Rather warm (ca 6 °C) and productive conditions prevailed during ca 7900–4500 cal yr BP. The chironomid record suggests a climate transition between ca 5200 and 4500 cal yr BP to cooler TJuly. A distinct cooling trend is evident from ca 4500 until ca 2500 cal yr BP. Thereafter, the study site experienced its coldest conditions (around 4 °C or less) throughout the rest of the Holocene, with the exception of the warming trend during the late 20th century. Beside other factors, the Northern Hemisphere summer insolation seems to be the major driving force for the long-term trends in TJuly at high altitudes in the Eastern Alps. Due to the extreme location of the lake and the limited temperature range represented by the applied calibration data set, the chironomid-based temperature reconstruction fails to track phases of the late-Holocene climatic history with TJuly cooler than 4 °C. Further chironomid-based palaeoclimate model and down-core studies are required to address this problem, provide more realistic TJuly estimates from undisturbed high-altitude lakes in the Alps, and extract a reliable regional

  12. Varved sediments of Lake Oeschinen, NW Alps: filling the gap in the flood frequency-precipitation relationship for the last millennium

    Science.gov (United States)

    Amann, Benjamin; Szidat, Sönke; Grosjean, Martin

    2016-04-01

    The global climate is warming, which is leading to changes in the hydrological cycle. What are the impacts of these climatic changes on the occurrence and magnitude of extreme flood events? Are these changes simultaneous or independent? These are key questions for future flood-risk predictions. In Europe, regional climate models do not show robust results for the future occurrence of precipitation extremes, which is mainly due to the difficulty in resolving precipitation events and the limited temporal coverage of instrumental data. To overcome this issue, considerable effort has been put forward by the paleoclimate community to produce millennial-long flood proxy records from natural archives. This has led to a more comprehensive understanding of flood events in relation to climate variability. However, while there is an increased consensus in the long-term flood-temperature relationship, still very little is known about the role of precipitation changes on flood frequency and magnitude. This is largely due to the lack of long-term and high-quality precipitation records. Here we present a millennial-long precipitation reconstruction together with a flood-frequency record obtained from the same natural paleoclimate archive. This allows, for the first time, the direct comparison between the two climate variables in the Alps. We used the varved (annually laminated) sediments of proglacial Lake Oeschinen (1580 m a.s.l., NW European Alps) to reconstruct warm season (MJJA) precipitation and summer flood frequency back to AD 884. Our results support recent findings from an increasing number of studies in the Swiss, German, French and Austrian Alps showing that floods were consistently more frequent during cool periods over the last Millennium. While the relationship between flood frequency and inferred moist climate has remained speculative, our precipitation reconstruction allows for a direct comparison and shows that flood frequency also increased during wetter

  13. Delineation of the geometry of the nodes in the Alps-Dinarides hinge zone and recognition of seismogenic nodes (M ≥ 6)

    International Nuclear Information System (INIS)

    Gorshkov, A.I.; Soloviev, A.A.; Panza, G.F.; Aoudia, A.; Peresan, A.

    2007-11-01

    In the junction zone between the Alps and the Dinarides, one of the most seismically active areas in Europe, we delineate a total of sixteen nodes which are capable of M ≥ 6.0 earthquakes using large-scale cartographic data. Seven of them have already experienced the occurrence of sufficiently well located earthquakes with M ≥ 6.0. Using these seven nodes as a learning set, we identify, by means of the pattern recognition methodology, three other nodes prone to earthquakes with M ≥ 6.0: one node in the Alpine domain and two in the northernmost Dinarides. (author)

  14. The last deglaciation in New Zealand ; revisiting the Misery moraines at Arthur's Pass in the Southern Alps of New Zealand

    Science.gov (United States)

    Fink, David; Rother, Henrik; Woodward, Craig; Shulmeister, James; Wilcken, Klaus

    2017-04-01

    Recent debate on mid-latitude New Zealand glaciation has focused on reconstructing paleo-climate conditions leading into the (global) Last Glacial Maximum and subsequent deglaciation dynamics during the last termination. Paleo-environmental evidence coupled with reliable glacial chronologies supporting a Southern Hemisphere glacial readvance commensurate with Younger Dryas timing ( 11.5-12.5 ka) showing similar cooling as observed in the Northern Hemisphere has also been hotly debated. Many New Zealand lake and pollen records suggest a minor cooling or hiatus in warming during the period from 14.5 - 12.0 ka which pre-dates YD onset and is more commonly associated with the Antarctic Cold Reversal (ACR) (14.7 - 13.0 ka). Achieving the required sub-millennial temporal differentiation using in-situ cosmogenic exposure dating comes with numerous difficulties. The Arthur's Pass Moraine complex, deposited by an alpine glacier advancing out of the Otira Gorge splaying east and westward over the divide of the Southern Alps in New Zealand ( 950 masl), exhibits a full post-LGM glacial chronology. The moraines consist of multiple cross-valley terminal, lobate and discontinuous latero-terminal moraines up to 3 kilometres down valley from the proximal Misery moraines at the outlet of Otira Gorge. Within the gorge towards the headwall only 1 km up-valley from the Misery sequence, no other moraines are evident. We have determined paired 10-Be and 26-Al exposure ages from 58 greywacke samples taken from all major moraines, including repeat sampling from the Misery moraines. The new exposure ages show that the Arthur's Pass moraine system spans a period of 19.5 ka to 12.0 ka (Putnam local NZ production rate) with mean recessional moraine ages in chrono-stratigraphic sequence. The overall timing of deglaciation after peak LGM conditions is similar to that observed at down-valley terminal positions of the larger outlet river systems of the Rakaia, Waimakariri and Rangitata Valleys

  15. Spatial and temporal modelling of fluvial aggradation in the Hasli Valley (Swiss Alps) during the last 1300 years

    Science.gov (United States)

    Llorca, Jaime; Schulte, Lothar; Carvalho, Filipe

    2016-04-01

    The Haslital delta (upper Aare River catchment, Bernese Alps) progradated into the Lake Brienz after the retreat of the Aare Glacier (post-LGM). Present delta plain geomorphology and spatial distribution of sedimentary facies result from historical fluvial dynamics and aggradation. Over centuries, local communities have struggled to control the Aare floods and to mitigate their effects on the floodplain (by means of raising artificial levees, channelizing the course, creating an underground drainage network, constructing dams at the basin headwaters). This study focuses on the spatial and temporal evolution of sediment dynamics of the floodplain by analyzing fluvial sedimentary records . The internal variability of lithostratigraphic sequences is a key issue to understand hydrological processes in the basin under the effect of environmental and anthropogenic changes of the past. The floodplain lithostratigraphy was reconstructed by coring alongside four cross-sections; each one is composed of more than 25 shallow boreholes (2 m deep) and two long drillings (variable depth, up to 9 m). The chronostratigraphical models were obtained by AMS 14C dating, and information of paleofloods and channel migration were reconstructed from historical sources (Schulte et al., 2015). The identification of different sedimentary facies, associated with the fluvial architecture structures, provides information on variations of vertical and lateral accretion processes (Houben, 2007). The location and geometry of buried channel-levee facies (gravel and coarse sand layers) indicate a significant mobility of the riverbed of the Hasli-Aare river, following an oscillatory pattern during the last millennia. Furthermore, fine sedimentary deposits and peat layers represent the existence of stable areas where floods have a low incidence. Once the different types of deposits were identified, aggradation rates were estimated in order to determine the spatial variability of the accumulation

  16. The Aiguille du Midi (Mont Blanc massif, European Alps): a unique high-Alpine site to study bedrock permafrost

    Science.gov (United States)

    Deline, P.; Bölhert, R.; Coviello, V.; Cremonese, E.; Gruber, S.; Jaillet, S.; Krautblatter, M.; Morra di Cella, U.; Noetzli, J.; Pogliotti, P.; Ravanel, L.; Sadier, B.; Verleysdonk, S.

    2009-12-01

    Permafrost and its change in steep high-Alpine rock walls remain insufficiently understood because of the difficulties of in situ measurements. A large proportion of permafrost studies is mainly based on modelling, with a few existing instrumented sites and a resulting lack of process understanding. Yet, a number of rockfalls that occurred in the last decade in the Alps are likely related to climatically-driven permafrost degradation, as indicated by ice in starting zones, increased air temperature, and modelling studies. Starting off in the framework of the French-Italian PERMAdataROC project and presently under development within the EU co-funded project PermaNET (Permafrost long-term monitoring network: www.permanet-alpinespace.eu), our investigations at the Aiguille du Midi begin in 2005. The summit (3842 m a.s.l) is accessible from Chamonix by a cable car which was built at the end of the 1950s. Half a million tourists visit the site each year. Because of its elevation, geometry, and year-round accessibility to rock slopes of diverse aspects and to galleries, the site was chosen for: - Monitoring of the thermal regime in steep rock walls. Sensors with one or three thermistors were installed since 2005 at depths of 3, 10, 30 and 55 cm, and three 15-thermistor chains were set up in 10-m-deep boreholes this autumn, at all aspects and with slope angles in the range 60-90° (determining e.g. the presence and influence of snow). - Measurements of high altitude climatic data (air temperature and humidity, incoming and outgoing solar radiation, wind speed and direction) perpendicular to the rockwall surface, by movable automatic weather stations. Together with the rock temperature measurements, these data are used for physically-based model validation or statistical models construction of rock temperature distribution and variability in the rock walls. - Making an ‘in and out’ 3D-high-resolution DEM of the Aiguille by long-range (rock walls) and short

  17. Meteoric diagenesis of catastrophic rockslide deposits of the Alps: diagenetic systems and implications for radiometric age-dating.

    Science.gov (United States)

    Sanders, D.; Ostermann, M.; Kramers, J.; Brandner, R.

    2009-04-01

    Deposits of catastrophic subaerial rockslides (=rapid mass-wasting events involving more than a million cubic meters of rock) composed of lithologies rich in carbonate minerals may undergo precipitation of cements that, in many cases, can be used to U/Th proxy-date the rockslide event and/or subsequent changes of the rockslide mass. In the Alps, lithification of rockslide masses into breccias is observed in rockslides composed of limestones, dolostones, calcitic-dolomitic marbles, and calcphyllites. Cementation may be localized to meteoric 'runoff-shadows' below larger boulders, or may comprise a continous surface veneer of breccia or, more rarely, may affect the entire rockslide mass. In addition, precipitation of flowstone cements and stalactites may take place in megapores along the underside of boulders. Cements comprise skalenohedral calcite, prismatic calcite, blocky calcite, calcimicrite, micropeloidal calcitic cement and, rarely, isopachous to botryoidal aragonite. Cement formation probably is driven by meteoric dissolution-reprecipitation of fine-grained, abrasive rock powder generated during the rockslide event. U/Th ages of cements indicate that most, but not all, precipitation starts closely after a rockslide event. In rockslides composed of calcphyllites with an accessory content of pyrite, aside of 'normal' meteoric dissolution-reprecipitation of abrasive carbonate gauge, oxidation of pyrite drives widespread carbonate dissolution followed by reprecipitation, as a cement, of part