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Sample records for ka bp event

  1. Lake-expanding events in the Tibetan Plateau since 40 kaBP

    Institute of Scientific and Technical Information of China (English)

    贾玉连; 施雅风; 王苏民; 蒋雪中; 李世杰; 王爱军; 李徐生

    2001-01-01

    Since 40 kaBP, the current endorheism on the Tibetan Plateau had experienced at least four lake-expanding events, at 40-28 kaBP, 19-15 kaBP, 13-11 kaBP, 9.0-5.0 kaBP, respectively. The 40-28 kaBP and 9.0-5.0 kaBP lake-expanding events, corresponding to the global warming periods, were mainly determined by the abundant summer monsoon rainfall brought by strong Indian monsoon, aroused by enhanced solar radiation at earth orbital precessional cycle. The 40-28 kaBP lake-expanding event, also called the great lake period or the pan-lake period, for several great lake groups had come into being by the interconnection of the presently isolated and closed lake catchments. The total lake area over the Tibetan Plateau was estimated at least up to 150000 km2, 3.8 times of the present, and the lake supply coefficients were about 3-10. The 9.0-5.0 kaBP lake-expanding, with a total lake area of 68000 km2, less than the above mentioned reflected the Indian monsoon rainfall less than that of 40-28 kaBP. The expanded lak

  2. The paleoclimatic events and cause in the Okinawa Trough during 50 kaBP

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Planktonic foraminiferal d18O record for core DGKS9603 from the Okinawa Trough shows a series of climatic fluctuations and sudden cooling events in short time scale during 50 kaBP, which appear to correlate closely to the Younger Dryas and Heinrich events H1-5 recorded in Chine-se loess, the South China Sea, the North Atlantic cores and the Greenland ice cores. Three polarity reversal events, cor-relating to Gothenburg, Mungo and Laschamp events, ap-proximately correspond to Heinrich events H1, H3 and H5 respectively, which could be a cause of global climate changes. The d18O curve of the Okinawa Trough is well asso-ciated with the grain size record of the Lijiayuan loess profile in northwestern China and is somewhat different from the climate fluctuations documented in the Greenland ice cores. These correlation results indicate that regional factors play an important role in controlling the climate changes in the East Asia, and the East Asian Monsoon could be the promi-nent regional controlling factor.

  3. Quantification of southwest China rainfall during the 8.2 ka BP event with response to North Atlantic cooling

    Science.gov (United States)

    Liu, Yuhui; Hu, Chaoyong

    2016-07-01

    The 8.2 ka BP event could provide important information for predicting abrupt climate change in the future. Although published records show that the East Asian monsoon area responded to the 8.2 ka BP event, there is no high-resolution quantitative reconstructed climate record in this area. In this study, a reconstructed 10-year moving average annual rainfall record in southwest China during the 8.2 ka BP event is presented by comparing two high-resolution stalagmite δ18O records from Dongge cave and Heshang cave. This decade-scale rainfall reconstruction is based on a central-scale model and is confirmed by inter-annual monitoring records, which show a significant positive correlation between the regional mean annual rainfall and the drip water annual average δ18O difference from two caves along the same monsoon moisture transport pathway from May 2011 to April 2014. Similar trends between the reconstructed rainfall and the stalagmite Mg / Ca record, another proxy of rainfall, during the 8.2 ka BP period further increase the confidence of the quantification of the rainfall record. The reconstructed record shows that the mean annual rainfall in southwest China during the central 8.2 ka BP event is less than that of present (1950-1990) by ˜ 200 mm and decreased by ˜ 350 mm in ˜ 70 years experiencing an extreme drying period lasting for ˜ 50 years. Comparison of the reconstructed rainfall record in southwest China with Greenland ice core δ18O and δ15N records suggests that the reduced rainfall in southwest China during the 8.2 ka BP period was coupled with Greenland cooling with a possible response rate of 110 ± 30 mm °C-1.

  4. Agriculture, Settlement, and Abrupt Climate Change: The 4.2ka BP event in Northern Mesopotamia

    Science.gov (United States)

    Ristvet, L.

    2003-12-01

    attendant villages. The survey records an 80% decline in settled hectares from the previous period. The only agricultural villages that remained occupied during this crisis were either concentrated along perennial wadis or located in areas with ample groundwater. Otherwise, the survey recorded the presence of a few temporary sites, probably camps belonging to semi-nomadic pastoralists, a lifestyle which may have begun in response to this event. The precipitation regime stabilized at approximately 1900 BC, allowing for a massive resettlement of the area. This resettlement did not, however, lead to a resumption of third millennium agricultural practices; instead, these villages embraced a flexible economic regime, which emphasized a reliance on pastoral as well as agricultural products, and as such, was well-adapted to the more marginal conditions of the early second millennium BC. This paper, therefore, attempts to quantify the effects of the 4.2 ka BP abrupt climate change event on ancient agricultural systems, settlement patterns, and societies through archaeological survey in northern Mesopotamia.

  5. 5 ka BP event in monsoonal China%我国季风区5 ka BP气候事件

    Institute of Scientific and Technical Information of China (English)

    李东; 谭亮成; 安芷生

    2016-01-01

    Background, aim, and scope A lot of studies suggested the Holocene climate change had played an important role in the evolution of the Neolithic cultures around the world. During the Holocene, there were a series of abrupt climate changes. One of the abrupt events occurred around~5 ka BP, which signiifcantly changed the environment of many regions over the world. Because this event occurred before the dawn of civilization, it had caused important inlfuences on human society. In this paper, we reviewed the recently published high-resolution, absolutely-dated speleothem and limnological records from different regions of monsoonal China, which had recorded hydrological changes during the 5 ka BP event period. We further discussed its impacts on the Neolithic culture of China, as well as the driving mechanisms.Materials and methods We divided the monsoonal China into Northeast China, North China, Central China, East China, South China, Southwest China and the Tibetan Plateau. We compared the hydrological changes in different regions of monsoonal China, by using recent published high-resolution, absoluted dated records.Results We suggested the monsoonal China, from the north to the south, had experienced dry climate during this event. The dry event was most signiifcantly recorded in North China, Northeast China and Tibetan Plateau. It began at 5.6—5.5 ka BP, reaching to the driest at ~5.0 ka BP, and then the precipitation rapidly recovered. Stalagmite record from Central China also showed similar result with North China. There was also cold and dry climate in Southwest China during the period of 5.5—4.8 ka BP. In South China, notably dry climate was observed in 5.5—5.0 ka BP. It seems there was imprint of 5 ka BP event in East China, although it’s hard to determine the exact timing, because of low resolutions and poor age controls of the published records. The extreme dry climate had played an important role on the evolution of Chinese Neolithic culture. The

  6. Work More? The 8.2 kaBP Abrupt Climate Change Event and the Origins of Irrigation Agriculture and Surplus Agro-Production in Mesopotamia

    Science.gov (United States)

    Weiss, H.

    2003-12-01

    The West Asian archaeological record is of sufficient transparency and resolution to permit observation of the social responses to the major Holocene abrupt climate change events at 8.2, 5.2 and 4.2 kaBP. The 8.2kaBP abrupt climate change event in West Asia was a three hundred year aridification and cooling episode. During this period rain-fed agriculture, established for over a millennium in northern Mesopotamia, suddenly collapsed. Irrigation agriculture, pastoral nomadism, or migration were the only subsistence alternatives for populations previously supported by cereal dry-farming. Irrigation agriculture was not, however, possible along the northern alluvial plains of the Tigris and Euphrates Rivers, where incised riverbeds were several meters below plain level. Exploitable plain-level levees were only accessible in southern-most alluvial plain, at the head of the present-day Persian Gulf. The archaeological data from this region documents the first irrigation agriculture settlement of the plain during the 8.2 kaBP event. Irrigation agriculture provides about twice the yield of dry-farming in Mesopotamia, but at considerable labor costs relative to dry-farming. With irrigation agriculture surplus production was now available for deployment. But why work more? The 8.2 kaBP event provided the natural force for Mesopotamian irrigation agriculture and surplus production that were essential for the earliest class-formation and urban life.

  7. Sporo-pollen Assemblage and Paleoclimate Events in Shelf Area of the Southern Yellow Sea Since 15 ka B.P.

    Institute of Scientific and Technical Information of China (English)

    孟广兰; 韩有松; 王少青; 王珍岩

    2004-01-01

    Based on the authors'1986 to 1994 sporo-pollen assemblage analysis in the southern Yellow Sea area, data from 3 main cores were studied in combination with 14C, palaeomagnetic and thermoluminescence data. The evolution of the paleoclimate environments in the southern Yellow Sea since 15ka B.P. was revealed that, in deglaciation of the last glacial period, the climate of late glaciation transformed into that of postglaciation, accompanied by a series of violent climate fluctuations. These evolution events happened in a global climate background and related to the geographic changes in eastern China. We distinguished three short-term cooling events and two warming events. Among them, the sporo-pollen assemblage of subzone A1 showed some cold climate features indicating that a cooling event occurred at about 15-14ka. B.P. in early deglaciation. This subzone corresponds to the Oldest Dryas. In subzone A3, many drought-enduring herbal pollens and some few pollens of cold-resistant Picea, Abies, etc. were found, which indicated that a cooling event, with cold and arid climate, occurred at about 12-11ka. B.P. in late deglaciation. This subzone corresponds to the Younger Dryas. The sporo-pollen assemblage of zone B showed warm and arid climate features in postglaciation. Although the assemblage of subzone B2 indicated a cold and arid climate environment, the development of flora in subzone B2 climate was less cold than that in A3. Subzone B2 indicated a cooling event which occurred at about 9ka B.P. in early Holocene. Subzone A2, with some distinct differences from subzone A1 and A3, indicated a warming event which occurred at 14-13ka. B.P. and should correspond to a warming fluctuation. The sporo-pollen assemblage of zone C showed features of warm-moist flora and climate, and indicated a warming event which universally occurred along the coast of eastern China at 8-3ka B.P. in middle Holocene, and its duration was longer than that of any climate events mentioned above

  8. An exceptionally strengthened East Asian summer monsoon event between 19.9 and 17.1 ka BP recorded in a Hulu stalagmite

    Institute of Scientific and Technical Information of China (English)

    L.; R.; EDWARDS

    2009-01-01

    A stalagmite-based isotope record (No. H82) from Nanjing Hulu Cave, spanning from 16.5 to 10.3 ka BP, provided strong evidence for a coherence relation between the East Asian summer monsoon (EASM) and the North Atlantic climates on millennial time scales. Here we extend the high-resolution δ 18O time series back to 22.1 ka BP with additional 7 230Th dates and 573 stable isotope measurements on the lower part of that sample. The new record with a decadal resolution, piecing together with the previous data, provides a detailed, complete Last Glacial Maximum (LGM)/deglacial history of the EASM. Two centennial-scale weak monsoon events are detected within the analogue H1 event, and can be corre- lated to corresponding Greenland temperature shifts. This suggests a rapid re-organization of atmos- pheric and oceanic circulations during the ice-rafted debris (IRD) event in North Atlantic. A strength- ened EASM event spanning from 19.9 to 17.1 ka BP, firstly reported here, reaches on average a half of the monsoon intensity of B?lling warming with its peak close to the full level. Taking all available evi- dence from continental and oceanic sediments into consideration, we suggest that a forcing mecha- nism behind the event would be a positive feedback of the tropical Pacific Super-ENSO cycles in re- sponse to precessional changes in solar irradiation.

  9. An exceptionally strensthened East Asian summer monsoon event between 19.9 and 1 7.1 ka BP recorded in a Hulu stalagmite

    Institute of Scientific and Technical Information of China (English)

    WU JiangYing; WANG YongJin; CHENG Hai; L.R.EDWARDS

    2009-01-01

    A stalagmite-based isotope record (No.H82)from Nanjing Hulu Cave,spanning from 16.5 to 10.3 ka BP,provided strong evidence for a coherence relation between the East Asian summer monsoon (EASM) and the North Atlantic climates on millennial time scales.Here we extend the high-resolution δ18O time series back to 22.1 ka BP with additional 7 230 Th dates and 573 stable isotope measurements on the lower part of that sample.The new record with a decadal resolution,piecing together with the previous data,provides a detailed,complete Last Glacial Maximum (LGM)/deglacial history of the EASM.Two centennial-scale weak monsoon events are detected within the analogue H1 event,and can be correlated to corresponding Greenland temperature shifts.This suggests a rapid re-organization of atmospheric and oceanic circulations during the ice-rafted debris (IRD) event in North Atlantic.A strengthened EASM event spanning from 19.9 to 17.1 ka BP,firstly reported here,reaches on average a half of the monsoon intensity of B(Φ)iling warming with its peak close to the full level.Taking all available evidence from continental and oceanic sediments into consideration,we suggest that a forcing mechanism behind the event would be a positive feedback of the tropical Pacific Super-ENSO cycles in response to precessional changes in solar irradiation.

  10. Beringian Megafaunal Extinctions at ~37 ka B.P.: Do Micrometeorites Embedded in Fossil Tusks and Skulls Indicate an Extraterrestial Precursor to the Younger Dryas Event?

    Science.gov (United States)

    Hagstrum, J. T.; Firestone, R. B.; West, A.

    2009-12-01

    Studies of Late Pleistocene megafaunal fossils and their ancient DNA from Beringia (eastern Siberia, Alaska, and the emerged Bering Strait) indicate sharp declines in steppe bison population diversity and horse body size, extinction of the Alaskan wild ass, and local extinctions of brown bear and woolly mammoth genetic lines beginning at about 37 ka B.P. Beringia is also well known for its remarkably preserved Late Pleistocene frozen animal mummies. 14C ages of these mummies are bimodally distributed, having peaks coincident with the earlier ~37 ka B.P., and ~13 ka B.P. Younger Dryas, onset extinction events. Associated with the ~37 ka B.P. event are, for example, the Berezovka mammoth, headless Selerikan horse, steppe bison “Blue Babe”, and baby mammoths “Dima” and “Lyuba”. Analyses of these and other mummies indicate that they died instantly, in mostly healthy condition, with gut contents and high fat reserves indicative of a late summer to autumn season. An assortment of uneaten limbs and other body parts from a variety of species have also been found. Uniformitarian death scenarios inadequately account for the lack of evidence of normal predation and scavenging. Extensive internal injuries (e.g. large bone fractures, hemorrhaging) and apparent rapid burial of the mummies also indicate that something truly unusual happened at the time of these extinction events. We have discovered what appear to be micrometeorites embedded in seven Alaskan mammoth tusks and a Siberian bison skull acquired from commercial sources. 14C ages for five of these fossils have a weighted mean age of 33 ± 2 ka B.P. Laser ablation ICP-MS and XRF analyses of the particles indicate high Fe contents with compositions enriched in Ni and depleted in Ti, similar to Fe meteorites and unlike any natural terrestrial sources. Microprobe analyses of a Fe-Ni sulfide grain from tusk 2 also show that it contains between 3 and 20 weight percent Ni. SEM images and XRF analyses of a bison

  11. Precise dating of East-Asian-Monsoon D/O events during 95―56 ka BP: Based on stalagmite data from Shanbao Cave at Shennongjia, China

    Institute of Scientific and Technical Information of China (English)

    XIA ZhiFeng; KONG XingGong; JIANG XiuYang; CHENG Hai

    2007-01-01

    Based on 23 U/Th analyses and 532 oxygen isotopic data, an averaged 80-a stalagmite oxygen isotopic composition series was established through 95 to 56 thousand years before present (ka BP) from two speleothems in Shanbao Cave, Shennongjia, central China. Shanbao Cave record (referred to as SB record) replicates well with Hulu Cave record, extending the characteristics of millennial oscillations in East-Asian-Summer-Monsoon (EASM) to the past 95 ka. The trend of the SB record generally follows mid-July solar insolation at 65°N, suggesting that mid-high northern latitude insolation, in the first order, controls changes of EASM intensity. Millennial oscillations of EASM recorded in the stalagmites are well related to the Greenland interstadials referred to as Dansgaard/Oeschger (D/O) events from 1 to 22, indicating that rapid ocean-atmosphere reorganization in North Atlantic has a remote effect in EASM. The well-dated D/O events by stalagmites probably provide an absolute calibration for chronologies of Greenland ice cores. The timings of D/O events in the SB record are different variously from those in Greenland ice cores. For D/O 19 and 20, the age offsets between the stalagmites' and the Greenland ice cores' record are significant, larger than the uncertainties of uranium-series dating. The two events in the SB record are younger than those in North GRIP time scale by 1―2 ka, and older than the counterparts in GISP2 by approximately 3―4 ka. A comparison between the SB and Brazil stalagmite record shows an anti-phase relation in millennial-scale monsoon precipitation between the two localities. This supports a mode for the coupled ocean-atmosphere "See-saw".

  12. Precise dating of East-Asian-Monsoon D/O events during 95―56 ka BP: Based on stalagmite data from Shanbao Cave at Shennongjia, China

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Based on 23 U/Th analyses and 532 oxygen isotopic data, an averaged 80-a stalagmite oxygen isotopic composition series was established through 95 to 56 thousand years before present (ka BP) from two speleothems in Shanbao Cave, Shennongjia, central China. Shanbao Cave record (referred to as SB record) replicates well with Hulu Cave record, extending the characteristics of millennial oscillations in East-Asian-Summer-Monsoon (EASM) to the past 95 ka. The trend of the SB record generally follows mid-July solar insolation at 65°N, suggesting that mid-high northern latitude insolation, in the first or- der, controls changes of EASM intensity. Millennial oscillations of EASM recorded in the stalagmites are well related to the Greenland interstadials referred to as Dansgaard/Oeschger (D/O) events from 1 to 22, indicating that rapid ocean-atmosphere reorganization in North Atlantic has a remote effect in EASM. The well-dated D/O events by stalagmites probably provide an absolute calibration for chro- nologies of Greenland ice cores. The timings of D/O events in the SB record are different variously from those in Greenland ice cores. For D/O 19 and 20, the age offsets between the stalagmites’ and the Greenland ice cores’ record are significant, larger than the uncertainties of uranium-series dating. The two events in the SB record are younger than those in North GRIP time scale by 1―2 ka, and older than the counterparts in GISP2 by approximately 3―4 ka. A comparison between the SB and Brazil stalag- mite record shows an anti-phase relation in millennial-scale monsoon precipitation between the two localities. This supports a mode for the coupled ocean-atmosphere "See-saw".

  13. 12 kaBP lake environment on the Tibetan Plateau

    Institute of Scientific and Technical Information of China (English)

    李炳元; 王苏民; 朱立平; 李元芳

    2001-01-01

    The systemic analyses have been carried out in this paper to the paleolake shorelines, paleolake sediments and paleoclimatic proxies of 20 lakes, in which there were 12 kaBP dating data on the Tibetan Plateau. The results showed that the paleolake level had apparently risen during 14-11 kaBP, the glaciers melting period, in the Tibetan area and Northwest China. Especially, much more increasing amplitude supplied by thawy glaciers water occurred than in the best period of Holocene. The temperate-humid climate around 12 kaBP appeared in the Tibetan area and even in the whole China. This event may be compared with the Bolling/Allerod warm period which was reflected by Europe and Greenland ice core records. It showed that the B/A event was not a regional one in the North Atlantic area.

  14. 北半球72ka BP气候突变事件及其与Toba火山的关系%The Relation between the 72 ka BP Event and the Toba Super-eruption

    Institute of Scientific and Technical Information of China (English)

    吴帅男; 陈仕涛; 段福才

    2012-01-01

    The abrupt cooling event occurred about 72(the 72 ka Event) is the largest climate change during the last glacial period.At the same time a super-eruption of Toba volcano,the largest explosive eruption over the past two million years,erupted in northern Sumatra,with a Volcanic Explosivity Index of magnitude 8.It always deserves special attention for the relation between the 72 ka Event and the Toba Super-eruption.Therefore,an in-depth study of the 72 ka Event should be useful for further evaluating the environment effect of the eruption and refining the mechanism of the abrupt events during the last glacial period.Here,we make a systematic rewiew about the research achievements from different fields such as marine cores,ice cores,stalagmites,loess,lakes and so on.These records showed different expressions on the cold event occurred about 72 ka BP and/or the Toba eruption and their relations.Based on the timing of this cold event and the Toba eruption,and the operating mechanism of the volcanic eruption on climate,the eruption has substantial impact on climate.This impact is well documented by Greenland ice core records,and further supported by climate models.Nevertheless,marine core records in low latitudes did not exhibit an obvious climate change around the super eruption,and,at least,the amplitude of the variation is not strong as one in the high latitude.Also,paleontological evidences show that the Toba eruption did not make a catastrophic effect on the living environment.So,the relation between the 72 ka Event and the Toba Super-eruption is still being hotly debated.The further progress depends not only on developing resolution and chronological precision of climate records,but also on detecting the evidence of volcanic eruptions as well.%72 ka BP左右的强降温事件是末次冰期最大的气候突变事件,且同时期发生了第四纪以来最强的火山喷发———Toba火山喷发,后者在此次强降温事件中扮演着什么角色一直

  15. 18 Ka BP records of climatic changes, Bay of Bengal: Isotopic and sedimentological evidences

    Digital Repository Service at National Institute of Oceanography (India)

    Chauhan, O.S.; Suneethi, J.

    arid climate between 18 and 15 14C Ka BP, a variable climate between 15 and 13 Ka BP, and again an arid climate at 12.5 Ka BP. The negative d18O, reduced C/I and higher smectite document a humid phase culminating at 12 Ka BP. Arid climate phases...

  16. Marine04 Marine radiocarbon age calibration, 26 ? 0 ka BP

    Energy Technology Data Exchange (ETDEWEB)

    Hughen, K; Baille, M; Bard, E; Beck, J; Bertrand, C; Blackwell, P; Buck, C; Burr, G; Cutler, K; Damon, P; Edwards, R; Fairbanks, R; Friedrich, M; Guilderson, T; Kromer, B; McCormac, F; Manning, S; Bronk-Ramsey, C; Reimer, P; Reimer, R; Remmele, S; Southon, J; Stuiver, M; Talamo, S; Taylor, F; der Plicht, J v; Weyhenmeyer, C

    2004-11-01

    New radiocarbon calibration curves, IntCal04 and Marine04, have been constructed and internationally ratified to replace the terrestrial and marine components of IntCal98. The new calibration datasets extend an additional 2000 years, from 0-26 ka cal BP (Before Present, 0 cal BP = AD 1950), and provide much higher resolution, greater precision and more detailed structure than IntCal98. For the Marine04 curve, dendrochronologically dated tree-ring samples, converted with a box-diffusion model to marine mixed-layer ages, cover the period from 0-10.5 ka cal BP. Beyond 10.5 ka cal BP, high-resolution marine data become available from foraminifera in varved sediments and U/Th-dated corals. The marine records are corrected with site-specific {sup 14}C reservoir age information to provide a single global marine mixed-layer calibration from 10.5-26.0 ka cal BP. A substantial enhancement relative to IntCal98 is the introduction of a random walk model, which takes into account the uncertainty in both the calendar age and the radiocarbon age to calculate the underlying calibration curve. The marine datasets and calibration curve for marine samples from the surface mixed layer (Marine04) are discussed here. The tree-ring datasets, sources of uncertainty, and regional offsets are presented in detail in a companion paper by Reimer et al.

  17. The Terrestrial NPP Simulation in China since 6ka BP

    Institute of Scientific and Technical Information of China (English)

    HE Yong; DONG Wenjie; JI Jinjun; DAN Li

    2005-01-01

    A better understanding of the long-term global carbon cycle required estimate of the changes in terrestrial carbon storage after the last glacial period. The results of simulation at mid-Holocene (MH) from PMIP (Paleoclimate Modeling Intercomparison Project) and the modern data from CRU (Climate Research Unit,East Anglia University, UK) allow us to use the Atmosphere-Vegetation Interaction Model (AVIM) to simulate the Chinese terrestrial net primary productivity (NPP) at 6ka BP and present time. The change of NPP and total NPP in China from now to mid-Holocene are about 54 g m-2yr-1 and 0.63 Pg yr-1,respectively, mainly due to the build-up of temperate forest and tropical rainforest. Chinese terrestrial NPP variation from MH to now is closely related to the variation in intensity of Asian monsoon, which controlled the climate-vegetation pattern change.

  18. Evidence and modeling study of droughts in China during 4 - 2 ka BP

    Institute of Scientific and Technical Information of China (English)

    WANG ShaoWu; HUANG JianBin; WEN XinYu; ZHU JinHong

    2008-01-01

    Four periods with predominated droughts are identified in 4-2 ka BP according to documentary data, namely 3.6-3.5, 3.1-3.0, 2.8-2.7, and 2.45-2.35 ka BP. Palaeo-environmental data indicated that droughts were predominated in 4-2 ka BP in the south of Northeast China, Inner-Mongolia, east of Qinghai-Tibetan Plateau, and South China. Modeling study shows that precession may be responsible for the occurrence of droughts in 4-2 ka BP, integrating the GCM with forcing of insolation.

  19. Sediment record of environmental change at Lake Lop Nur (Xinjiang, NW China) from 13.0 to 5.6 cal ka BP

    Science.gov (United States)

    Wang, Jingzhong; Jia, Hongjuan

    2016-09-01

    Lake Lop Nur is located in the eastern part of the Tarim Basin in Xinjiang, northwestern China. A 220-cm-long sediment core was collected from the center of the ear-shaped depression forming the basin and dated with AMS14C. Grain size, total organic matter (TOC), total nitrogen (TN), and TOC/TN (C/N) analyses were used to reconstruct climatic conditions from 13.0 to 5.6 cal ka BP. The results showed five main climatic stages. Zone I (13.0-11.3 cal ka BP) was a wet-dry environment, whereas Zone II (11.3-8.9 cal ka BP) consisted of a primarily wet environment. Zone III (8.9-7.7 cal ka BP) was subdivided into Zone IIIa (8.9-8.2 cal ka BP) that indicated lake constriction and dry climate, and Zone IIIb (8.2-7.7 cal ka BP) in which the proxies indicated wet conditions. In Zone IV (7.7-6.6 cal ka BP), the climate presented a bit wet conditions. In Zone V (6.6-5.6 cal ka BP), abundant glauberite is present in the sediment and silt dominates the lithology; these results indicate the lake shrank and the overall climate was dry. Abrupt environmental events were also identified, including six dry events at 11.0, 10.5, 9.3, 8.6, 8.2, and 7.6 cal ka BP and one flood event from 7.8 to 7.7 cal ka BP in the Early-Middle Holocene.

  20. Sediment record of environmental change at Lake Lop Nur (Xinjiang, NW China) from 13.0 to 5.6 cal ka BP

    Science.gov (United States)

    Wang, Jingzhong; Jia, Hongjuan

    2017-09-01

    Lake Lop Nur is located in the eastern part of the Tarim Basin in Xinjiang, northwestern China. A 220-cm-long sediment core was collected from the center of the ear-shaped depression forming the basin and dated with AMS14C. Grain size, total organic matter (TOC), total nitrogen (TN), and TOC/TN (C/N) analyses were used to reconstruct climatic conditions from 13.0 to 5.6 cal ka BP. The results showed five main climatic stages. Zone I (13.0-11.3 cal ka BP) was a wet-dry environment, whereas Zone II (11.3-8.9 cal ka BP) consisted of a primarily wet environment. Zone III (8.9-7.7 cal ka BP) was subdivided into Zone IIIa (8.9-8.2 cal ka BP) that indicated lake constriction and dry climate, and Zone IIIb (8.2-7.7 cal ka BP) in which the proxies indicated wet conditions. In Zone IV (7.7-6.6 cal ka BP), the climate presented a bit wet conditions. In Zone V (6.6-5.6 cal ka BP), abundant glauberite is present in the sediment and silt dominates the lithology; these results indicate the lake shrank and the overall climate was dry. Abrupt environmental events were also identified, including six dry events at 11.0, 10.5, 9.3, 8.6, 8.2, and 7.6 cal ka BP and one flood event from 7.8 to 7.7 cal ka BP in the Early-Middle Holocene.

  1. Sedimentary Characteristics and Paleoenvironmental Records of Zabuye Salt Lake, Tibetan Plateau, since 128 ka BP

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    This paper for the first time reveals high-resolution core records of Zabuye Salt Lake in the interior of the Qinghai-Tibet Plateau. According to 1346 samples taken continuously, relatively accurate 14C, U-series disequilibrium and ESR ages have been obtained, thus revealing that the lake core ages from 0 to 83.63 m of hole SZK02 are ~800 to over 128 ka. In the paper, the lake core sedimentary characteristics (including the lithologies and mineral assemblages) are analyzed in detail and correlated with ostracod assemblages Ⅰ to ⅩⅩ and sporopollen zones A to I, and on the basis of an integrated analysis of the δ18O values of authigenic calcium-magnesium carbonate and environmental proxies of minerals, sporopollen and microfossils in the lake core, a correlation has been made of oxygen isotope change between this lake core and the Greenland GISP2 and GRIP and Guliya ice cores, and the climate of Zabuye Salt Lake since 128 ka BP is divided into the last interglacial stage (including substages e, d, c, b and a) of oxygen isotope stage (OIS) 5, early glacial stadial of the last glacial stage of OIS 4, interglacial stadial of the last glacial stage of OIS 3, late glacial stadial of the last glacial stage or Last Glacial Maximum of OIS 2 and postglacial state of OIS 1; in addition, 6 Heinrich (H6-H1) events, Younger Dryas event and 8.2 ka BP cold event have been recognized.

  2. The 8.2 ka event in the northern Alps

    Science.gov (United States)

    Luetscher, M.; Hoffmann, D. L.; Müller, W.; Spötl, C.

    2012-04-01

    The 8.2 ka event has been identified as a widespread climate excursion affecting most of the Northern Hemisphere. High-resolution records from ice cores and speleothems constrain the chronology of this event to between 8.21±0.02 and 8.08±0.03 ka BP (Vinther et al. 2006, Cheng et al. 2009). A distinctive asymmetrical pattern in d18O is consistent with modelling results suggesting rapid input of freshwater into the northern Atlantic due to catastrophic drainage of ice-marginal lakes (LeGrande et al., 2008). Despite an increasing amount of data, the regional expression of this event is still poorly understood. Here, we present a new speleothem record from Gasselhöhle in the Northern Calcareous Alps, Austria. The 205 mm-long GAS19 stalagmite was analysed at high resolution for stable isotopes (100 µm) and trace elements (~10-15 µm; continuous LA-ICPMS profiles). Twelve individual MC-ICP-MS U/Th ages underline an annual growth rate of ca. 60 µm during the Early Holocene. The d18O averages -8.9‰, only slightly more depleted than modern carbonate precipitates from the same cave chamber. The 8.2 ka event is marked in GAS19 by a ca. 1‰ excursion with a minimum value of -9.9‰. Largely invariant trace element concentrations (e.g. Mg, U, Sr, Ba) indicate essentially no changes in the local hydrological regime and therefore support the hypothesis of a temperature-dominated signal. The proximity to the lacustrine isotope record from Mondsee (eg. Lauterbach et al. 2011) opens new perspectives for the interpretation of the oxygen isotope signal using two archives at different elevations. Moreover, several coeval speleothem records are available across the Eastern Alps fostering a spatial comparison of the proxy signals associated with this event. Cheng, H. et al. (2009), Geology, 37, 1007-1010 Lauterbach, S. et al. (2011), JQS, 26, 253-267 LeGrande, A.N., Schmidt, G.A. (2008), Paleoceanography, 23, doi: 10.1029/2008PA001610 Vinther, B. et al. (2006), JGR, 111, D13103

  3. 35 ka BP climate simulations in East Asia and probing the mechanisms of climate changes

    Institute of Scientific and Technical Information of China (English)

    YU Ge; ZHENG Yiqun; KE Xiankun

    2005-01-01

    Paleoclimate modeling has become an important tool to detect the future climate of the global warming that is difficult to be validated. The paleoclimate modeling has to be evaluated by regionally geological data in order to determine if it is able to reproduce a reality of climate states. Geological evidence shows that there was a warm-wet interstadial at 35000±3000 a BP in China, which provides an important climate period to be historical analogue for the future climate changes induced by greenhouse gas emissions. Integrated geological records of later phase of the MSI3 from China also provide basements for evaluation of 35 ka BP climate modeling. This paper reports the paleoclimate experiments applied by various forces, and validates the outputs by geological data, consequently improving the boundary conditions in the experiments and making the paleoclimates more approach the reality. The simulations show an increased temperature in the mid-low latitudes and an extended rain-belt northwards in East Asia, while a decreased temperature in high latitudes and a strong exchange of the N-S atmospheric circulation. As there is only ca. 10-15 ka from 35 ka BP to the LGM (21 ka BP) during which climate rapidly changed from a warm-wet interstadial to a typical ice age, this simulation provides scientific basis to recognize the criteria of global warming and trends of natural climate development.

  4. Desert evolution and climatic changes in the Tarim River basin since 12 ka BP

    Institute of Scientific and Technical Information of China (English)

    冯起; 苏志珠; 金会军

    1999-01-01

    Climatic changes in the Tarim River basin since 12 kaBP were divided into four stages based on the analyses of sedimentary phase, the features of some climatic and environmental biomarks in the sedimentary strata and desert evolution. During the Holocene, cool-dry and temperate-dry climates resulted in apparent alluvial-fluvial and weak aeolian activities. During 10—8 kaBP, the climate was dry and cold, large-scale sand dunes activities led to regional desert expansion. During the hypsithermal (8—3 kaBP), the climate was dry and warm, shifting sand areas decreased and a lot of sand dunes were fixed along the banks of the Tarim River and its tributaries, lowlands and lakes. As a result, fluvial-alluvial areas increased. Since 3 kaBP, the aeolian activity and sandstorms have been enhancing due to the combined influences of climatic warming and illogical exploitation of land and water resources. The climate in the Tarim River basin have been persistently dry and alternated by warm and cold periods. Conse

  5. Direct linking of Greenland and Antarctic ice cores at the Toba eruption (74 ka BP

    Directory of Open Access Journals (Sweden)

    A. Svensson

    2013-03-01

    Full Text Available The Toba eruption that occurred some 74 ka ago in Sumatra, Indonesia, is among the largest volcanic events on Earth over the last 2 million years. Tephra from this eruption has been spread over vast areas in Asia, where it constitutes a major time marker close to the Marine Isotope Stage 4/5 boundary. As yet, no tephra associated with Toba has been identified in Greenland or Antarctic ice cores. Based on new accurate dating of Toba tephra and on accurately dated European stalagmites, the Toba event is known to occur between the onsets of Greenland interstadials (GI 19 and 20. Furthermore, the existing linking of Greenland and Antarctic ice cores by gas records and by the bipolar seesaw hypothesis suggests that the Antarctic counterpart is situated between Antarctic Isotope Maxima (AIM 19 and 20. In this work we suggest a direct synchronization of Greenland (NGRIP and Antarctic (EDML ice cores at the Toba eruption based on matching of a pattern of bipolar volcanic spikes. Annual layer counting between volcanic spikes in both cores allows for a unique match. We first demonstrate this bipolar matching technique at the already synchronized Laschamp geomagnetic excursion (41 ka BP before we apply it to the suggested Toba interval. The Toba synchronization pattern covers some 2000 yr in GI-20 and AIM-19/20 and includes nine acidity peaks that are recognized in both ice cores. The suggested bipolar Toba synchronization has decadal precision. It thus allows a determination of the exact phasing of inter-hemispheric climate in a time interval of poorly constrained ice core records, and it allows for a discussion of the climatic impact of the Toba eruption in a global perspective. The bipolar linking gives no support for a long-term global cooling caused by the Toba eruption as Antarctica experiences a major warming shortly after the event. Furthermore, our bipolar match provides a way to place palaeo-environmental records other than ice cores into a

  6. Grain-size cycles in Salawusu River valley since 150 ka BP

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The palaeo-mobile dune sands and fluvio-lacustrine facies with palaeosols in Milanggouwan stratigraphic section of the Salawusu River valley situated at the southeast of the Mu Us Desert experienced abundant remarkable alternative changes of coarse and fine rhythms in grainsize since 150 ka BP, and the grain-size parameters - Mz, σ, Sk, Kg and SC/I also respond to the situation of multi-fluctuational alternations between peak and valley values. Simultaneity the grainsize eigenvalues - Ф5, Ф16, P25, Ф50, Ф75, Ф84 and Ф95 are respondingly manifested as greatly cadent jumpiness. Hereby, the Milanggouwan section can be divided into 27 grain-size coarse and fine sedimentary cycles, which can be regarded as a real and integreted record of climate-geological process of desert vicissitude resulted from the alternative evolvement of the ancient winter and summer monsoons of East Asia since 150 ka BP.

  7. The WAIS Divide deep ice core WD2014 chronology - Part 2: Annual-layer counting (0-31 ka BP)

    Science.gov (United States)

    Sigl, Michael; Fudge, Tyler J.; Winstrup, Mai; Cole-Dai, Jihong; Ferris, David; McConnell, Joseph R.; Taylor, Ken C.; Welten, Kees C.; Woodruff, Thomas E.; Adolphi, Florian; Bisiaux, Marion; Brook, Edward J.; Buizert, Christo; Caffee, Marc W.; Dunbar, Nelia W.; Edwards, Ross; Geng, Lei; Iverson, Nels; Koffman, Bess; Layman, Lawrence; Maselli, Olivia J.; McGwire, Kenneth; Muscheler, Raimund; Nishiizumi, Kunihiko; Pasteris, Daniel R.; Rhodes, Rachael H.; Sowers, Todd A.

    2016-03-01

    We present the WD2014 chronology for the upper part (0-2850 m; 31.2 ka BP) of the West Antarctic Ice Sheet (WAIS) Divide (WD) ice core. The chronology is based on counting of annual layers observed in the chemical, dust and electrical conductivity records. These layers are caused by seasonal changes in the source, transport, and deposition of aerosols. The measurements were interpreted manually and with the aid of two automated methods. We validated the chronology by comparing to two high-accuracy, absolutely dated chronologies. For the Holocene, the cosmogenic isotope records of 10Be from WAIS Divide and 14C for IntCal13 demonstrated that WD2014 was consistently accurate to better than 0.5 % of the age. For the glacial period, comparisons to the Hulu Cave chronology demonstrated that WD2014 had an accuracy of better than 1 % of the age at three abrupt climate change events between 27 and 31 ka. WD2014 has consistently younger ages than Greenland ice core chronologies during most of the Holocene. For the Younger Dryas-Preboreal transition (11.595 ka; 24 years younger) and the Bølling-Allerød Warming (14.621 ka; 7 years younger), WD2014 ages are within the combined uncertainties of the timescales. Given its high accuracy, WD2014 can become a reference chronology for the Southern Hemisphere, with synchronization to other chronologies feasible using high-quality proxies of volcanism, solar activity, atmospheric mineral dust, and atmospheric methane concentrations.

  8. Direct linking of Greenland and Antarctic ice cores at the Toba eruption (74 ka BP)

    Science.gov (United States)

    Svensson, A.; Bigler, M.; Fischer, H.; Johnsen, S. J.; Kipfstuhl, S.; Parrenin, F.; Rasmussen, S. O.; Steffensen, J. P.; Vinther, B. M.; Wegner, A.

    2012-04-01

    The Toba eruption that occurred some 74 ka ago in Sumatra, Indonesia, is among the largest volcanic events on Earth over the last 2 million years. Tephra from this eruption has been spread over vast areas in Asia where it constitutes a major reference horizon close to the Marine Isotope Stage 3/4 (MIS 3/4) boundary. Up to now, no tephra has been associated with Toba neither in Greenland nor in Antarctic ice cores, but based on Toba tephra identified in marine records from the Arabian Sea it is very likely that Greenland ice core acidity spikes related to Toba occur towards the end of Greenland Interstadial 20 (GI-20). Furthermore, the linking of Greenland and Antarctic ice cores by gas records suggests that the Antarctica counterpart should be situated between Antarctic Isotope Maxima (AIM) 19 and 20. In this work we suggest a direct synchronization of Greenland (NGRIP) and Antarctic (EDML) ice cores based on matching of a pattern of bi-polar volcanic spikes and annual layer counting in both cores around 74 ka BP. The synchronization pattern covers some 2000 years in GI-20 and AIM 19/20 and includes 5 major and several minor acidity peaks that are recognized in both ice cores. The most prominent acidity spikes in this time interval that occur towards the end of GI-20, are those thought to originate from Toba, but the proposed linking is independent of the source of the volcanic spikes. Although the linking of Greenland and Antarctic ice cores around Toba is already quite well constrained by matching of gas records, the relative phasing between ice cores from the two hemispheres still has some uncertainty related to the offset in the age of ice and air bubbles in the ice cores (delta-gas age). The identification of a direct Toba synchronization may help to determine the exact phasing of inter-hemispheric climate during this period and to constrain delta-gas ages. It also provides a way to place paleo-environmental records other than ice cores into a precise climatic

  9. Multiproxy evidence for terrestrial and aquatic ecosystem responses during the 8.2 ka cold event as recorded at Højby Sø, Denmark

    DEFF Research Database (Denmark)

    Hede, Mikkel Ulfeldt; Rasmussen, Peter; Noe-Nygaard, Nanna;

    2010-01-01

    .2 ka cold event as registered in the Greenland ice cores. At Højby Sø, the climate anomaly appears to have started 200–250 yr earlier than the 8.2 ka cold event as the lake proxy data provide strong evidence for a precipitation-induced distinct increase in catchment soil erosion beginning around 8500...... cal yr BP. Alteration of the terrestrial environment then resulted in a major aquatic ecosystem change with nutrient enrichment of the lake and enhanced productivity, which lasted until c. 7900 cal yr BP. Keywords: 8.2 ka cold event; Lake sediments; Palaeoclimate; Pollen; Macrofossils; Geochemistry...

  10. Sedimentary cycles of trace elements in Salawusu River Valley since 150 ka BP

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    The paper makes some analyses on 11 trace elements in the Milanggouwan stratigraphical section in the Salawusu River valley, which is regarded as a prototype geology-palaeoclimate record since 150 ka BP. The results show that the content and variation of trace elements has experienced remarkably regular changes in the pace with coarse and fine sedimentary cycles of palaeo-aeolian sands to its overlying fluvio-lacustrine facies or/and palaeosols. The trace elements with chemical properties of relatively active (V, Sr, Cu, Ni, As) and relatively stable (P, Pb, Rb, Mn, Nb, Zr) are a manifestation of the corresponding 27 changeable cycles between peak and valley values, appearing a multi-fluctuational process line of relative gathering and migration since then. The low numerical value distribution of these two types of trace elements in the aeolian sand facies represents erosion and accumulation under wind force during the cold-dry climate. Whereas their enrichments in both fluvio-lacustrine facies and palaeosols are related to the valley's special low-lying physiognomic position between the Ordos Plateau and the Loess Plateau under the warm and humid climate conditions. The above relatively migrated and gathered change of the trace elements is the result of 27 climatic cycles of cold-dry and warm-humid, which is probably caused by repeated alternations of winter monsoon and summer monsoon in the Mu Us Sandy Land influenced by the climate vicissitudes in northern hemisphere during glacial and interglacial periods since 150 ka BP.

  11. Desert-steppe migration on the Loess Plateau at about 450 kaBP

    Institute of Scientific and Technical Information of China (English)

    ZHAOJingbo

    2005-01-01

    According to the field investigation, observation by an electronic microscope and x-ray identification and chemical analysis, desert-steppe migration in the Loess Plateau at about 450 kaBP was studied. The data show that gypsum illuvial horizon indicating the desert-steppe environment developed in the early stage of the formation of the fifth layer loess in Shaoling tableland in Chang'an and Bailu tableland in Xran of Shaanxi are situated in the southern Loess Plateau. This indicates that remarkable drying occurred, a large-scope migration of desert steppe took place toward south and the climate zone migrated 5 degrees in latitude to south which is the largest migration range indicated by geochemical indexes. The desert-steppe and more wild environment distributed widely on the Loess Plateau at that time. The development of gypsum also indicates that the climate changed at 450 kaBP from monsoon climate to nonmonsoon climate in the Loess Plateau, and the region was not affected by summer monsoon and was in the cold and dry environment of nonmonsoon climate. Annual mean nrecinitation was about 200 rnm. 400 mm less at that time than at oresent.

  12. The reconstruction of paleo wind directions for the Eifel region (Central Europe during the period 40.3–12.9 ka BP

    Directory of Open Access Journals (Sweden)

    K. Seelos

    2009-09-01

    Full Text Available A continuous reconstruction of last glacial wind directions is based on provenance analysis of eolian sediments in a sediment core from the Dehner dry Maar in the Eifel region (Germany. This Maar is suitable to archive paleo wind directions due to its location west of the Devonian carbonate basins of the Eifel-North-South-Zone. Thus, eolian sediments with high clastic carbonate content can be interpreted as an east wind signal. The detection of such east wind sediments is applied by a new module of the RADIUS grain size analyze technique. Increased frequencies of east wind occur during the time intervals corresponding with the Heinrich events H1 and H2. The unusual H3 show no higher east wind frequency but so do its former and subsequent Greenland stadials. The LGM (21–18 ka BP is characterized by a slightly elevated east wind activity. The investigated time period from 40.3–12.9 ka BP can be subclassified in three units: The first time period during Marine Isotope Stage 3 (40.3–36 ka BP is controlled by relative warm climate leading to an enriched content of organic matter in the sediment. Thus, there is only little accumulation of dust in the Eifel region and Heinrich 4 is not recorded in the archive by our dust proxy. The second time slice (36–24 ka BP has an increased content of dust accumulation and a high amount of east winds layers (up to 19% of the dust storms per century came from the east. In comparison, the subsequent period (24–12.9 ka BP is characterized by lower east winds sediments again.

  13. Abrupt Climate Change around 4 ka BP:Role of the Thermohaline Circulation as Indicated by a GCM Experiment

    Institute of Scientific and Technical Information of China (English)

    王绍武; 周天军; 蔡静宁; 朱锦红; 谢志辉; 龚道溢

    2004-01-01

    A great deal of palaeoenvironmental and palaeoclimatic evidence suggests that a predominant temperature drop and an aridification occurred at ca. 4.0 ka BP. Palaeoclimate studies in China support this dedution. The collapse of ancient civilizations at ca. 4.0 ka BP in the Nile Valley and Mesopotamia has been attributed to climate-induced aridification. A widespread alternation of the ancient cultures was also found in China at ca. 4.0 ka BP in concert with the collapse of the civilizations in the Old World. Palaeoclimatic studies indicate that the abrupt climate change at 4.0 ka BP is one of the realizations of the cold phase in millennial scale climate oscillations, which may be related to the modulation of the Thermohaline Circulation (THC) over the Atlantic Ocean. Therefore, this study conducts a numerical experiment of a GCM with SST forcing to simulate the impact of the weakening of the THC. Results show a drop in temperature from North Europe, the northern middle East Asia, and northern East Asia and a significant reduction of precipitation in East Africa, the Middle East, the Indian Peninsula, and the Yellow River Valley. This seems to support the idea that coldness and aridification at ca. 4.0 ka BP was caused by the weakening of the THC.

  14. The WAIS Divide deep ice core WD2014 chronology – Part 2: Annual-layer counting (0–31 ka BP

    Directory of Open Access Journals (Sweden)

    M. Sigl

    2015-07-01

    Full Text Available We present the WD2014 chronology for the upper part (0–2850 m, 31.2 ka BP of the West Antarctic Ice Sheet (WAIS Divide ice core. The chronology is based on counting of annual layers observed in the chemical, dust and electrical conductivity records. These layers are caused by seasonal changes in the source, transport, and deposition of aerosols. The measurements were interpreted manually and with the aid of two automated methods. We validated the chronology by comparing to two high-accuracy, absolutely dated chronologies. For the Holocene, the cosmogenic isotope records of 10Be from WAIS Divide and 14C for Intcal13 demonstrated WD2014 was consistently accurate to better than 0.5 % of the age. For the glacial period, comparisons to the Hulu Cave chronology demonstrated WD2014 had an accuracy of better than 1 % of the age at three abrupt climate change events between 27 and 31 ka. WD2014 has consistently younger ages than Greenland ice-core chronologies during most of the Holocene. For the Younger Dryas-Preboreal transition (11 546 ka BP, 24 years younger and the Bølling-Allerød Warming (14 576 ka, 7 years younger WD2014 ages are within the combined uncertainties of the timescales. Given its high accuracy, WD2014 can become a reference chronology for the Southern Hemisphere, with synchronization to other chronologies feasible using high quality proxies of volcanism, solar activity, atmospheric mineral dust, and atmospheric methane concentrations.

  15. Using data assimilation to investigate the causes of Southern Hemisphere high latitude cooling from 10 to 8 ka BP

    NARCIS (Netherlands)

    P. Mathiot; H. Goosse; X. Crosta; B. Stenni; M. Braida; A. Mairesse; S. Dubinkina (Svetlana)

    2013-01-01

    htmlabstractFrom 10 to 8 ka BP (thousand years before present), paleoclimate records show an atmospheric and oceanic cooling in the high latitudes of the Southern Hemisphere. During this interval, temperatures estimated from proxy data decrease by 0.8 °C over Antarctica and 1.2 °C over the Southern

  16. Study of the varve record from Erlongwan maar lake,NE China, over the last 13 ka BP

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    In a sediment sequence from Erlongwan maar lake that spans the last 13 ka BP, two main varve types can be recognized: biogenic varves (from the present to ~11.2 ka BP, 0-632 cm) and clastic varves (from ~11.2 to ~12.7 ka BP, 632-700 cm). Based on the dominant types of algae contained in the sediment, the biogenic varves can be classified into dinocyst-biogenic varves (0-63 cm) and mixed (dinocyst and diatom)-biogenic varves (214-632 cm). In this paper, the formation process and components of the varve are described, the possible reason for the types of varve changing throughout the record is discussed and a high-resolution varve chronology is established spanning the last 13 ka BP.Although further varve counting and error assessment are needed, the results presented here represent a solid foundation for studying the palaeoclimate record of Erlongwan maar lake.

  17. Glacial to paraglacial history and forest recovery in the Oglio glacier system (Italian Alps) between 26 and 15 ka cal BP

    Science.gov (United States)

    Ravazzi, Cesare; Badino, Federica; Marsetti, Diego; Patera, Glauco; Reimer, Paula J.

    2012-12-01

    The integrated stratigraphic, radiocarbon and palynological record from an end-moraine system of the Oglio valley glacier (Italian Alps), propagating a lobe upstream in a lateral reach, provided evidence for a complete cycle of glacial advance, culmination and withdrawal during the Last Glacial Maximum and early Lateglacial. The glacier culminated in the end moraine shortly after 25.8 ± 0.8 ka cal BP, and cleared the valley floor 18.3-17.2 ± 0.3 ka cal BP. A primary paraglacial phase is then recorded by fast progradation of the valley floor. As early as 16.7 ± 0.3 ka cal BP, early stabilization of alluvial fans and lake filling promoted expansion of cembran pine. This is an unprecedented evidence of direct tree response to depletion of paraglacial activity during the early Lateglacial, and also documents the cembran pine survival in the mountain belt of the Italian Alps during the last glaciation. Between 16.1 and 14.6 ± 0.5 ka cal BP, debris cones emplacement points to a moisture increase favouring tree Betula and Pinus sylvestris-mugo. A climate perturbation renewed paraglacial activity. According to cosmogenic ages on glacial deposits and AMS radiocarbon ages from lake records in South-Eastern Alps such phase compares favourably with the Gschnitz stadial and with the oscillations recorded at lakes Ragogna, Längsee and Jeserzersee, most probably forced by the latest freshening phases of the Heinrich Event 1. A further sharp pine rise marks the subsequent onset of Bølling interstadial. The chronology of the Oglio glacier compares closely with major piedmont glaciers on the Central and Eastern Alpine forelands. On the other hand, the results of the present study imply a chronostratigraphic re-assessment of the recent geological mapping of the Central Italian Alps.

  18. The 9.2 ka event in Asian summer monsoon area: the strongest millennial scale collapse of the monsoon during the Holocene

    Science.gov (United States)

    Zhang, Wenchao; Yan, Hong; Dodson, John; Cheng, Peng; Liu, Chengcheng; Li, Jianyong; Lu, Fengyan; Zhou, Weijian; An, Zhisheng

    2017-06-01

    Numerous Holocene paleo-proxy records exhibit a series of centennial-millennial scale rapid climatic events. Unlike the widely acknowledged 8.2 ka climate anomaly, the likelihood of a significant climate excursion at around 9.2 cal ka BP, which has been notably recognized in some studies, remains to be fully clarified in terms of its magnitude and intensity, as well as its characteristics and spatial distributions in a range of paleoclimatic records. In this study, a peat sediment profile from the Dajiuhu Basin in central China was collected with several geochemical proxies and a pollen analysis carried out to help improve understanding of the climate changes around 9.2 cal ka BP. The results show that the peat development was interrupted abruptly at around 9.2 cal ka BP, when the chemical weathering strength decreased and the tree-pollen declined. This suggests that a strong drier regional climatic event occurred at around 9.2 cal ka BP in central China, which was, in turn, probably connected to the rapid 9.2 ka climate event co-developing worldwide. In addition, based on the synthesis of our peat records and the other Holocene hydrological records from Asian summer monsoon (ASM) region, we further found that the 9.2 ka event probably constituted the strongest abrupt collapse of the Asian monsoon system during the full Holocene interval. The correlations between ASM and the atmospheric 14C production rate, the North Atlantic drift ice records and Greenland temperature indicated that the weakened ASM event at around 9.2 cal ka BP could be interpreted by the co-influence of external and internal factors, related to the changes of the solar activity and the Atlantic Meridional Overturning Circulation (AMOC).

  19. Pollen-recorded climate changes between 13.0 and 7.0 14C ka BP in southern Ningxia, China

    Institute of Scientific and Technical Information of China (English)

    SUN AiZhi; MA YuZhen; FENG ZhaoDong; LI Fei; WU HuiNing

    2007-01-01

    A pollen record from Haiyuan section in the southern part of Ningxia revealed a detailed history of vegetation variation and associated climate changes during the period from ~13.0 to ~7.0 14C ka BP. A steppe landscape under a moderately dry (and probably cool) condition (~12.7-~12.1 14C ka BP) was replaced by a coniferous forest dominating the landscape under a generally wet climate from ~12.1 to ~11.0 14C ka BP. This generally wet period, corresponding to the European B(o)lling/All(e)rod period, can be divided into three stages: a cool and wet stage between ~12.1 and ~11.4 14C ka BP, a mild and relatively dry stage between ~11.4 and ~11.2 14C ka BP, and a mild and wet stage between ~11.2 and ~11.0 14C ka BP. The coniferous forest-dominated landscape was then deteriorated into steppe landscape (~11.0-~10.6 14C ka BP) and further into a desert steppe landscape from ~10.6 to ~9.8 14C ka BP, being correspondent to the European Younger Dryas period. After a brief episode of a cool and wet climate (~9.8-~9.6 14C ka BP), a relatively mild and dry condition prevailed during the early Holocene (~9.6-~7.6 14C ka BP) and then a warm and humid climate started the mid-Holocene (~7.6-~7.2 14C ka BP).

  20. AN AGCM +SSiB MODEL SIMULATION ON CHANGES IN PALAEOMONSOON CLIMATE AT 21 KA BP IN CHINA

    Institute of Scientific and Technical Information of China (English)

    陈星; 于革; 刘健

    2001-01-01

    The numerical simulation experiment of climate at Last Glacial Maximum (LGM, 21 ka BP)in China is made by using an atmospheric general circulation model (AGCM) coupled with land surface processes (AGCM+SSiB) and earth orbital parameters and boundary forcing conditions at 21 ka. The modeled climate features are compared with reconstructed conditions at 21 ka from palco-lake data and pollen data. The results show that the simulated climate conditions at 21 ka in China are fairly comparable with palco-climatological data. The climate features at 21 ka in China from the experiment are characterized by a drier in the east and a wetter in the west and in the Tibetan Plateau as well. According to the analysis of distribution of pressure and precipitation, as well as the intensity of atmospheric circulation at 21 ka, monsoon circulation in eastern Asia was significantly weak comparing with the present. In the Tibetan Plateau, the intensity of summer monsoon circulation was strengthened, and winter monsoon was a little stronger than the present.The simulation with given forcing boundary conditions, especially the different vegetation coverage, can reproduce the climate condition at the LGM in China, and therefore provides dynamical mechanisms on the climate changes at 21 ka.

  1. A high-resolution temporal record of environmental changes in the Eastern Caribbean (Guadeloupe) from 40 to 10 ka BP

    Science.gov (United States)

    Royer, Aurélien; Malaizé, Bruno; Lécuyer, Christophe; Queffelec, Alain; Charlier, Karine; Caley, Thibaut; Lenoble, Arnaud

    2017-01-01

    In neotropical regions, fossil bat guano accumulated over time as laminated layers in caves, hence providing a high-resolution temporal record of terrestrial environmental changes. Additionally, cave settings have the property to preserve such organic sediments from processes triggered by winds (deflation, abrasion and sandblasting) and intense rainfall (leaching away). This study reports both stable carbon and nitrogen isotope compositions of frugivorous bat guano deposited in a well-preserved stratigraphic succession of Blanchard Cave on Marie-Galante, Guadeloupe. These isotopic data are discussed with regard to climate changes and its specific impact on Eastern Caribbean vegetation during the Late Pleistocene from 40 to 10 ka cal. BP. Guano δ13C values are higher than modern ones, suggesting noticeable vegetation changes. This provides also evidence for overall drier environmental conditions during the Pleistocene compared to today. Meanwhile, within this generally drier climate, shifts between wetter and drier conditions can be observed. Large temporal amplitudes in both δ13C and δ15N variations reaching up to 5.9‰ and 16.8‰, respectively, also indicate these oceanic tropical environments have been highly sensitive to regional or global climatic forcing. Stable isotope compositions of bat guano deposited from 40 to 35 ka BP, the Last Glacial Maximum and the Younger-Dryas reveal relatively wet environmental conditions whereas, at least from the end of the Heinrich event 1 and the Bølling period the region experienced drier environmental conditions. Nevertheless, when considering uncertainties in the model age, the isotopic record of Blanchard Cave show relatively similar variations with known proxy records from the northern South America and Central America, suggesting thus that the Blanchard Cave record is a robust proxy of past ITCZ migration. Teleconnections through global atmospheric pattern suggest that islands of the eastern Caribbean Basin could

  2. Using data assimilation to investigate the causes of Southern Hemisphere high latitude cooling from 10 to 8 ka BP

    Directory of Open Access Journals (Sweden)

    P. Mathiot

    2012-11-01

    Full Text Available Paleoclimate records show an atmospheric and oceanic cooling in the high latitudes of the Southern Hemisphere from 10 to 8 ka BP. In order to study the causes of this cooling, simulations covering the early Holocene period have been performed with the climate model of intermediate complexity LOVECLIM constrained to follow the signal recorded in climate proxies using a data assimilation method based on a particle filtering. The selected proxies represent oceanic and atmospheric surface temperature in the Southern Hemisphere derived from terrestrial, marine and glaciological records. Using our modeling framework, two mechanisms potentially explaining the 10–8 ka BP cooling pattern are investigated. The first hypothesis is a change in atmospheric circulation. The state obtained by data assimilation displays a modification of the meridional atmospheric circulation around Antarctica, producing a 0.6 °C drop in atmospheric temperatures over Antarctica from 10 to 8 ka BP without congruent cooling of the atmospheric and sea-surface temperature in the Southern Ocean. The second hypothesis is a cooling of the sea surface temperature in the Southern Ocean, simulated here as the response to a higher West Antarctic Ice Sheet melting rate. Using data assimilation, we constrain the fresh water flux to increase by 100 mSv from 10 to 8 ka BP. This perturbation leads to an oceanic cooling of 0.5 °C and a strengthening of Southern Hemisphere westerlies (+6%. However, the observed cooling in Antarctic and the Southern Ocean proxy records can only be reconciled with the combination of a modified atmospheric circulation and an enhanced freshwater flux.

  3. Using data assimilation to investigate the causes of Southern Hemisphere high latitude cooling from 10 to 8 ka BP

    Directory of Open Access Journals (Sweden)

    P. Mathiot

    2013-04-01

    Full Text Available From 10 to 8 ka BP (thousand years before present, paleoclimate records show an atmospheric and oceanic cooling in the high latitudes of the Southern Hemisphere. During this interval, temperatures estimated from proxy data decrease by 0.8 °C over Antarctica and 1.2 °C over the Southern Ocean. In order to study the causes of this cooling, simulations covering the early Holocene have been performed with the climate model of intermediate complexity LOVECLIM constrained to follow the signal recorded in climate proxies using a data assimilation method based on a particle filtering approach. The selected proxies represent oceanic and atmospheric surface temperature in the Southern Hemisphere derived from terrestrial, marine and glaciological records. Two mechanisms previously suggested to explain the 10–8 ka BP cooling pattern are investigated using the data assimilation approach in our model. The first hypothesis is a change in atmospheric circulation, and the second one is a cooling of the sea surface temperature in the Southern Ocean, driven in our experimental setup by the impact of an increased West Antarctic melting rate on ocean circulation. For the atmosphere hypothesis, the climate state obtained by data assimilation produces a modification of the meridional atmospheric circulation leading to a 0.5 °C Antarctic cooling from 10 to 8 ka BP compared to the simulation without data assimilation, without congruent cooling of the atmospheric and sea surface temperature in the Southern Ocean. For the ocean hypothesis, the increased West Antarctic freshwater flux constrainted by data assimilation (+100 mSv from 10 to 8 ka BP leads to an oceanic cooling of 0.7 °C and a strengthening of Southern Hemisphere westerlies (+6%. Thus, according to our experiments, the observed cooling in Antarctic and the Southern Ocean proxy records can only be reconciled with the reconstructions by the combination of a modified atmospheric circulation and an enhanced

  4. Palaeolake and palaeoenvironment between 42 and 18 kaBP in Tengger Desert, NW China

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Comprehensive field investigations and laboratory analyses show that palaeolakes, including fresh- mesohaline water Megalake Tengger and other semi-con- nected, isolated water bodies, during late Pleistocene covered an area of more than 20000 km2, which is more than half of the Tengger Desert in NW China. Stratigraphic correlation and chronological evidence indicate that before ca. 42000 aBP the area was more arid. The palaeolakes started to develop around 40000 uncal. 14C aBP but until 37000 14C aBP their scope was limited. High water levels established from 35000 14C aBP lasted until 22000 14C aBP. Lake levels regressed between 22000 and 20000 14C aBP but transgressed from 20000 to 18600 14C aBP. Subsequently, water level declined further and the Megalake Tengger finally desiccated at around 18000 14C aBP. Megalake Tengger possessed a fresh-mesohaline water property, implying that the regional precipitation increased significantly. During the period of Megalake Tengger, the climate was warmer-humid than present. The annual rainfall was 250 to 350 mm more than that of today and the temperature was 1.5 to 3.0℃ higher.

  5. Sporo-pollen assemblage and paleoclimate events in shelf area of the southern Yellow Sea since 15 ka B. P.

    Science.gov (United States)

    Meng, Guanglan; Han, Yousong; Wang, Shaoqing; Wang, Zhenyan

    2004-03-01

    Based on the authors’ 1986 to 1994 sporo-pollen assemblage analysis in the southern Yellow Sea area, data from 3 main cores were studied in combination with14C, palaeomagnetic and thermoluminescence data. The evolution of the paleoclimate environments in the southern Yellow Sea since 15ka B. P. was revealed that, in deglaciation of the last glacial period, the climate of late glaciation transformed into that of postglaciation, accompanied by a series of violent climate fluctuations. These evolution events happened in a global climate background and related to the geographic changes in eastern China. We distinguished three short-term cooling events and two warming events. Among them, the sporo-pollen assemblage of subzone A1 showed some cold climate features indicating that a cooling event occurred at about 15-14ka. B. P. in early deglaciation. This subzone corresponds to the Oldest Dryas. In subzone A3, many drought-enduring herbal pollens and some few pollens of cold-resistant Picea, Abies, etc. were found, which indicated that a cooling event, with cold and arid climate, occurred at about 12-11ka. B. P. in late deglaciation. This subzone corresponds to the Younger Dryas. The sporo-pollen assemblage of zone B showed warm and arid climate features in postglaciation. Although the assemblage of subzone B2 indicated a cold and arid climate environment, the development of flora in subzone B2 climate was less cold than that in A3. Subzone B2 indicated a cooling event which occurred at about 9ka B. P. in early olocene. Subzone A2, with some distinct differences from subzone A1 and A3, indicated a warming event which occurred at 14-13ka. B.P. and should correspond to a warming fluctuation. The sporo-pollen assemblage of zone C showed features of warn-moist flora and climate, and indicated a warming event which universally occurred along the coast of eastern China at 8-3 ka B. P. in middle Holocene, and its duration was longer than that of any climate events mentioned

  6. The WAIS-Divide deep ice core WD2014 chronology – Part 2: Methane synchronization (68–31 ka BP and the gas age-ice age difference

    Directory of Open Access Journals (Sweden)

    C. Buizert

    2014-08-01

    Full Text Available The West Antarctic Ice Sheet (WAIS-Divide ice core (WAIS-D is a newly drilled, high-accumulation deep ice core that provides Antarctic climate records of the past ∼68 ka at unprecedented temporal resolution. The upper 2850 m (back to 31.2 ka BP have been dated using annual-layer counting. Here we present a chronology for the deep part of the core (67.8–31.2 ka BP, which is based on stratigraphic matching to annual-layer-counted Greenland ice cores using globally well-mixed atmospheric methane. We calculate the WAIS-D gas age-ice age difference (Δage using a combination of firn densification modeling, ice flow modeling, and a dataset of δ15N-N2, a proxy for past firn column thickness. The largest Δage at WAIS-D occurs during the last glacial maximum, and is 525 ± 100 years. Internally consistent solutions can only be found when assuming little-to-no influence of impurity content on densification rates, contrary to a recently proposed hypothesis. We synchronize the WAIS-D chronology to a linearly scaled version of the layer-counted Greenland Ice Core Chronology (GICC05, which brings the age of Dansgaard-Oeschger (DO events into agreement with the U/Th absolutely dated Hulu speleothem record. The small Δage at WAIS-D provides valuable opportunities to investigate the timing of atmospheric greenhouse gas variations relative to Antarctic climate, as well as the interhemispheric phasing of the bipolar "seesaw".

  7. Ecological Regime Shifts in Lake Kälksjön, Sweden, in Response to Abrupt Climate Change Around the 8.2 ka Cooling Event

    DEFF Research Database (Denmark)

    Randsalu-Wendrup, L.; Conley, D.J.; Snowball, I.;

    2012-01-01

    periphytic to planktonic diatom dominance over a 250-year period and a gradual diversification of the periphytic community that spanned c. 150 years. Rapid climate warming following the 8.2 ka event likely caused these changes and both regime shifts are examples of externally driven abrupt ecological change......A detailed diatom record from Lake Ka¨ lksjo¨ n, westcentral Sweden, reveals two periods of abrupt ecological change correlative with the 8.2 ka cooling event. Using a combination of abrupt step changes and piece-wise linear regressions, the diatom data were analyzed for change points over time...... increase in nutrient supply to the lake. The second event was characterized by a substantial shift within the planktonic diatom community from taxa indicative of colder conditions to those indicating warm over 5–10 years at c. 7850 cal. y BP. This event was superimposed on a successive change from...

  8. The evolution of deserts with climatic changes in China since 150 ka B.P.

    Institute of Scientific and Technical Information of China (English)

    董光荣; 陈惠忠; 王贵勇; 李孝泽; 邵亚军; 金炯

    1997-01-01

    According to the bioclimatic zones, dune mobility and the fabric characteristics of stratigraphic sedimentary facies, the deserts in China are divided into Eastern, Western, Central and Northwestern deserts. Based on the records of stratigraphical facies, climatic proxies, historical data, etc. in each desert region, the evolution of deserts with climatic changes in time and space since 150 ka B. P. in China are dealt with; then the evolution of deserts in relation to the glacial climatic fluctuations caused by solar radiation changes, underlying surface variation and their feedback mechanism is discussed through comparison with global records; finally, in consideration of global wanning due to increasing of greenhouse gases such as CO2, the possible tendency of the evolution of deserts and the climatic changes is discussed.

  9. Millennial-Scale Climate Variability during the Last 28 cal. ka BP in the Tyrrhenian Sea (central Sector of Mediterranean Sea)

    Science.gov (United States)

    Amore, F. Ornella; Palumbo, Eliana; Elderfield, Henry; Perugia, Carmen; Emanuele, Dario; Petrillo, Zaccaria

    2014-05-01

    High resolution reconstructions of coccolithophore assemblages and plankton carbon and oxygen stable isotope data from Ocean Drilling Project (ODP) Hole 974D have been studied to investigate climate variability in the Tyrrhenian Sea (Western Mediterranean) during the last 28 cal. ka BP. The main climatic signal is showed by coccolithophore assemblages and isotopic records at glacial/interglacial timescale. Through the application of statistical analyses, a possible role of half and fourth precession cycles was hypothesised, more likely linked to the influence of the Equator insolation on central sector of Western Mediterranean circulation. The occurrence of abrupt coolings, more likely connected to Northern Hemisphere global climatic changes, was hypothesised also in the Tyrrhenian Sea during the Last Glacial (LG) and the Holocene, highlighted by the occurrence of the subpolar species Coccolithus pelagicus pelagicus. The events of the LG occurred in correspondence of the Dansgaard/Oeschger (D/O) stadial at 28 cal. ka BP and Heinrich event 2. The Holocene events were quite synchronous with several Bond Cycles and Rapid Climate Changes. In addition, marine warm phases, coincident with the D/O interstadial 2 and the Bølling-Allerød interval, were recognised at ODP Hole 974D by increases of warm species. Furthermore, during the Younger Dryas, oxygen stable isotope record indicates the occurrence of a cooling while coccolithophore assemblages testify increased nutrient conditions, highlighted by the group of small Gephyrocapsa. During the transition to the Holocene a latitudinal warming was observed, through the comparison of available data from coccolithophore assemblages of other sites of the Tyrrhenian Sea (Sbaffi et al., 2001; Buccheri et al., 2002; Amore et al., 2004). The latitudinal warming moved northward versus the central part of the basin, reaching the maximum amplitude in correspondence of Tyrrhenian Holocene Climatic Optimum (Buccheri et al., 2002). Other

  10. Geological record of meltwater events at Qinghai Lake, China from the past 40 ka

    Science.gov (United States)

    Zhou, Weijian; Liu, Taibei; Wang, Hao; An, Zhisheng; Cheng, Peng; Zhu, Yizhi; Burr, G. S.

    2016-10-01

    We report here on a previously unpublished sediment core from Qinghai Lake, China, that preserves a continuous record of sedimentation for the past 40 ka. A striking feature of the record is a set of distinct meltwater events recorded at 35, 19 and 14 ka respectively. These events are manifest as distinct pulses of relatively old organic radiocarbon in the sediments. We interpret these as a signal of glacial melting in the Qinghai Lake watershed. The meltwater signals are closely correlated to temperature and precipitation records associated with deglaciation. The events at 19 ka and 14 ka correspond to well-established high latitude Melt Water Pulse (MWP) events during Marine Isotope Stage (MIS) 2, and the 35 ka event corresponds to a period of pervasive high lake levels in western China during late MIS 3. We interpret these anomalous dates as the result of relatively old carbon that was destabilized by the glaciers, and released into the lake as the glaciers melted. The data indicate that this process takes thousands of years. We expect that the approach employed here to identify these events is generally applicable to any lake system with a significant glacial meltwater component.

  11. Paleotemperature reconstructions from speleothem fluid inclusions between 14 - 10 ka BP in Milandre cave (NW Switzerland)

    Science.gov (United States)

    Affolter, Stéphane; Häuselmann, Anamaria; Fleitmann, Dominik; Leuenberger, Markus

    2016-04-01

    In cave environments, speleothems constitute a well preserved and precisely dated continental climate archive that record past environmental changes such as paleotemperature or moisture source, namely through oxygen and hydrogen isotopes variations. Fluid inclusions are common in speleothems and they correspond to micrometric voids that often contain fossil liquid water representing past precipitation falling above the cave nearly at the time the inclusions were sealed. To measure the δD and δ18O isotopic composition of speleothem fluid inclusions, we extracted submicrolitre amounts of water from stalagmites (old and recent) coming from Milandre cave (Switzerland) using a new online method developed at the University of Bern (Affolter et al., 2014). The released water is then flushed directly to a Picarro L1102-i or L2140-i laser based instrument that allows to simultaneously monitor hydrogen and oxygen isotopes. At Milandre cave site, a two year isotope monitoring campaign has confirmed that isotopes in precipitation for northwestern Switzerland are principally controlled by air temperature (Affolter et al., 2015). Therefore, when combined with calcite δ18O, the fluid inclusion water isotopes can be used to calculate paleotemperatures. We reconstructed a cold season biased (roughly autumn - winter - spring) paleotemperature trend for the time interval covering the Allerød, the Younger Dryas cold interval and the early Holocene (13'900 - 9'900 BP). References: Affolter S., Fleitmann D., and Leuenberger M.: New online method for water isotope analysis of speleothem fluid inclusions using laser absorption spectroscopy (WS-CRDS), Clim. Past, 10, 1291-1304, doi:10.5194/cp-10-1291-2014, 2014. Affolter S., Häuselmann A.D., Fleitmann D., Häuselmann P., Leuenberger M.: Triple isotope (δD, δ17O, δ18O) study on precipitation, drip water and speleothem fluid inclusions for a Western Central European cave (NW Switzerland), Quat. Sci. Rev., 127, pp. 73-89, 2015.

  12. Climate-driven changes in water level: a decadal scale multiproxy study recording the 8.2-ka event and ecosystem responses in Lake Sarup (Denmark)

    DEFF Research Database (Denmark)

    Hansen, Rikke Bjerring; Olsen, Jesper; Jeppesen, Erik

    2013-01-01

    A two-stage change in lake level during the 8.2-ka event was identified in Lake Sarup, Denmark (55A degrees N), using a multiproxy approach on precise radiocarbon wiggle-matched annually laminated sediments deposited 8740-8060 cal. yr BP. Changes in delta C-13 and delta O-18 indicated closed lake...... hydrology driven by precipitation. The isotopic, sedimentary and plant macrofossil records suggested that the lake level started to decrease around 8400 cal. yr BP, the decrease accelerating during 8350-8260 before an abrupt increase during 8260-8210. This pattern shows that the climate anomaly started...

  13. Evidence for natural fire and climate history since 37 ka BP in the northern part of the South China Sea

    Institute of Scientific and Technical Information of China (English)

    孙湘君[1; 李逊[2; 陈怀成[3

    2000-01-01

    The history of natural fire since 37 kaBP and its relationship to climate for the northern part of the South China Sea are revealed from the statistic study of charcoal particles and associated pollen data from deep sea core 17940 (20° 07’N, 117° 23’E, 1 727 m in water depth). Our study indicates that, during the last glaciation, the concentration of charcoal and the ratio of concentration between charcoal and terrestrial pollen are much higher than that of the Holocene. This can be explained as the relatively high strength and frequency of natural fire during glaciation which is probably due to the drier climate; during the Last Glacial Maximum (LGM), the substantial rising of the concentration of large and medium charcoal particles probably suggests the local source area of the natural fires, i.e. the exposed continental shelf; moreover, the correlation between charcoal concentration with different size and pollen percentage may elucidate different transport dynamics. During the glacial time, almost

  14. Linking the 8.2 ka Event and its Freshwater Forcing in the Labrador Sea

    Science.gov (United States)

    Hoffman, Jeremy S.; Carlson, Anders E.; Winsor, Kelsey; Klinkhammer, Gary P.; LeGrande, Allegra N.; Andrews, John T.; Strasser, C.

    2012-01-01

    The 8.2 ka event was the last deglacial abrupt climate event. A reduction in the Atlantic meridional overturning circulation (AMOC) attributed to the drainage of glacial Lake Agassiz may have caused the event, but the freshwater signature of Lake Agassiz discharge has yet to be identified in (delta)18O of foraminiferal calcite records from the Labrador Sea, calling into question the connection between freshwater discharge to the North Atlantic and AMOC strength. Using Mg/Ca-paleothermometry, we demonstrate that approx. 3 C of near-surface ocean cooling masked an 1.0 % decrease in western Labrador Sea (delta)18O of seawater concurrent with Lake Agassiz drainage. Comparison with North Atlantic (delta)18O of seawater records shows that the freshwater discharge was transported to regions of deep-water formation where it could perturb AMOC and force the 8.2 ka event.

  15. KaTie: for parton-level event generation with k_T-dependent initial states

    CERN Document Server

    van Hameren, A

    2016-01-01

    KaTie is a parton-level event generator for hadron scattering processes that can deal with partonic initial-state momenta with an explicit transverse momentum dependence causing them to be space-like. Provided with the necessary transverse momentum dependent parton density functions, it calculates the off-shell matrix elements and performs the phase space importance sampling to produce weighted events, for example in the Les Houches Event File format. It can deal with arbitrary processes within the Standard Model, for up to four final-state particles and beyond. Furthermore, it can produce events for single-parton scattering as well as for multi-parton scattering.

  16. A Detailed Radiometric Chronological Framework for Nordic Seas Ocean-Ice Sheet Interactions Spanning 50-150 Ka BP

    Science.gov (United States)

    Brendryen, J.; Edwards, R. L.; Haflidason, H.; Cheng, H.; Grasmo, K. J.; Sejrup, H. P.

    2014-12-01

    Chronological control of sedimentary deposits is a key to do paleoclimatic interpretations of proxy records and to compare them with records from other archives. Beyond the reach of radiocarbon dating there are however few options for developing chronological control. We present a detailed radiometrical-based chronological framework of a Norwegian Sea core archive that records ocean-ice sheet interactions in the Nordic Seas covering the time span 50-150 ka BP. The chronology is based on a detailed multi-proxy and multi-archive alignment of high resolution records from the Norwegian Sea and precisely radiometric dated speleothem δ18O record from both China and the Alps. This approach utilizes the close and well documented millennial and multi-centennial scale coupling between the North Atlantic climate variability (recorded in the Norwegian Sea records, the Greenland ice cores and in the Alpine speleothems) and the Asian Monsoon system recorded in the Chinese speleothem δ18O. One intriguing feature of the Norwegian Sea record is that it often is more similar to the Chinese speleothem records than to the Greenland ice core records. The alignment is aided by a tephrostratigraphic link to the Greenland ice cores which provide an independent test of the age model and alignment. Uncertainties are addressed by Bayesian age-depth modeling. The radiometric-based age model and the quantified uncertainties enable an independent comparison between the Nordic Seas ocean-ice sheet interaction and other absolutely dated records such as U/Th dated sea-level indices and orbital parameters. This improves our ability to interpret the ocean-ice sheet interactions of the polar north in a global context over this time span that comprises a glacial-interglacial cycle.

  17. Evidence for natural fire and climate history since 37 ka BP in the northern part of the South China Sea

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    The history of natural fire since 37 kaBP and its relationship to climate for the northern part of the South China Sea are revealed from the statistic study of charcoal particles and associated pollen data from deep sea core 17940 (20°07′N, 117°23′E, 1 727 m in water depth). Our study indicates that, during the last glaciation, the concentration of charcoal and the ratio of concentration between charcoal and terrestrial pollen are much higher than that of the Holocene. This can be explained as the relatively high strength and frequency of natural fire during glaciation which is probably due to the drier climate; during the Last Glacial Maximum (LGM), the substantial rising of the concentration of large and medium charcoal particles probably suggests the local source area of the natural fires, i.e. the exposed continental shelf; moreover, the correlation between charcoal concentration with different size and pollen percentage may elucidate different transport dynamics. During the glacial time, almost all the peak concentrations of small particles correspond with the peak pollen percentage of Artemisia, an indicator of comparatively dry climate, while for large particles, their concentrations always lag behind small particles and thus change with pollen percentage of montane conifers implying relatively cold and humid climate. So, it is possible to assume that small particles reflect regional emissions under drier climate and were brought over by strengthened winter monsoon. When the climate became relatively humid, the increasing precipitation carried the large particles accumulated on continental shelf before under arid condition to the studied area.

  18. Evidence for higher-than-average air temperatures after the 8.2 ka event provided by a Central European δ18O record

    Science.gov (United States)

    Andersen, Nils; Lauterbach, Stefan; Erlenkeuser, Helmut; Danielopol, Dan L.; Namiotko, Tadeusz; Hüls, Matthias; Belmecheri, Soumaya; Dulski, Peter; Nantke, Carla; Meyer, Hanno; Chapligin, Bernhard; von Grafenstein, Ulrich; Brauer, Achim

    2017-09-01

    The so-called 8.2 ka event represents one of the most prominent cold climate anomalies during the Holocene warm period. Accordingly, several studies have addressed its trigger mechanisms, absolute dating and regional characteristics so far. However, knowledge about subsequent climate recovery is still limited although this might be essential for the understanding of rapid climatic changes. Here we present a new sub-decadally resolved and precisely dated oxygen isotope (δ18O) record for the interval between 7.7 and 8.7 ka BP (103 calendar years before AD 1950), derived from the calcareous valves of benthic ostracods preserved in the varved lake sediments of pre-Alpine Mondsee (Austria). Besides a clear reflection of the 8.2 ka event, showing a good agreement in timing, duration and magnitude with other regional stable isotope records, the high-resolution Mondsee lake sediment record provides evidence for a 75-year-long interval of higher-than-average δ18O values directly after the 8.2 ka event, possibly reflecting increased air temperatures in Central Europe. This observation is consistent with evidence from other proxy records in the North Atlantic realm, thus most probably reflecting a hemispheric-scale climate signal rather than a local phenomenon. As a possible trigger we suggest an enhanced resumption of the Atlantic meridional overturning circulation (AMOC), supporting assumptions from climate model simulations.

  19. A role for icebergs in the 8.2 ka climate event

    Energy Technology Data Exchange (ETDEWEB)

    Wiersma, Ane P. [Vrije Universiteit Amsterdam, Faculty of Earth and Life Sciences, Amsterdam (Netherlands); Deltares, Department of Morphology and Sedimentary Systems, Utrecht (Netherlands); Jongma, Jochem I. [Vrije Universiteit Amsterdam, Faculty of Earth and Life Sciences, Amsterdam (Netherlands)

    2010-08-15

    We investigate the potential role of icebergs in the 8.2 ka climate event, using a coupled climate model equipped with an iceberg component. First, we evaluate the effect of a large iceberg discharge originating from the decaying Laurentide ice sheet on ocean circulation, compared to a release of an identical volume of freshwater alone. Our results show that, on top of the freshwater effect, a large iceberg discharge facilitates sea-ice growth as a result of lower sea-surface temperatures induced by latent heat of melting. This causes an 8% increased sea-ice cover, 5% stronger reduction in North Atlantic Deep Water production and 1 C lower temperature in Greenland. Second, we use the model to investigate the effect of a hypothetical two-stage lake drainage, which is suggested by several investigators to have triggered the 8.2 ka climate event. To account for the final collapse of the ice-dam holding the Laurentide Lakes we accompany the secondary freshwater pulse in one scenario with a fast 5-year iceberg discharge and in a second scenario with a slow 100-year iceberg discharge. Our experiments show that a two-stage lake drainage accompanied by the collapsing ice-dam could explain the anomalies observed around the 8.2 ka climate event in various climate records. In addition, they advocate a potential role for icebergs in the 8.2 ka climate event and illustrate the importance of latent heat of melting in the simulation of climate events that involve icebergs. Our two-stage lake drainage experiments provide a framework in the discussion of two-stage lake drainage and ice sheet collapse. (orig.)

  20. Climatic changes documented by stable isotopes of sedimentary carbonate in Lake Sugan, northeastern Tibetan Plateau of China, since 2 kaBP

    Institute of Scientific and Technical Information of China (English)

    QIANG Mingrui; CHEN Fahu; ZHANG Jiawu; GAO Shangyu; ZHOU Aifeng

    2005-01-01

    Lake Sugan at the northern edge of the Qaidam Basin was selected as the research object. The temporal sequence of sedimentary cores retrieved from Lake Sugan since 2 kaBP was reconstructed using the 210Pb, AMS 14C and conventional 14C dating methods. Carbon and oxygen isotopes of carbonate in the fine-grained lake sediments were analysed. Combined with the changes of δ18O values of surface water and air temperature observation data in the study area, it might be thought that theδ18O value of the carbonate indicates effective moisture, and the changes in δ13C values are related to annual freeze-up duration of the lake and indirectly indicate air temperature changes in winter half year. From the above, the sequence of climatic changes in the region since 2 kaBP was established. The climatic changes experienced five stages: Warm-dry climate during 0-190 AD; cold-dry climate during 190-580 AD; warm-dry climate during 580-1200 AD (MWP); cold-wet climate during 1200-1880 AD (LIA); cold-dry climate during 1880-1950 AD; and climate warming since 1950s. The air temperature changes in winter half year reflected by carbon isotope since 2 kaBP are in good agreement with the historical literature records and other geologic records, which shows that the climate changes recorded by the stable isotopes from Lake Sugan since 2 kaBP are of universal significance.

  1. Toward more realistic freshwater forcing experiments of the 8.2 ka event

    Science.gov (United States)

    Morrill, C.; Wagner, A. J.; Ward, E. M.; Otto-Bliesner, B. L.; Rosenbloom, N. A.

    2015-12-01

    The 8.2 ka event is a key test case for simulating the coupled climate response to changes in the Atlantic Meridional Overturning Circulation (AMOC). Most previous model experiments of this event were forced by the drainage of proglacial Lake Agassiz-Ojibway into the Hudson Bay and entering the Atlantic Ocean through the Hudson Strait. This drainage contained enough water to raise global sea level about 0.2 meters or more, but it likely had a short duration on the order of one year. Recent advances in quantifying the meltwater forcing associated with the 8.2 ka event point towards a forcing larger than the drainage of Lake Agassiz-Ojibway, probably involving the collapse of the Hudson Bay ice dome and raising global sea level on the order of 1.5 to 3.0 meters. Using the Community Climate System Model version 3 (CCSM3), we show that this larger forcing yields a better match to paleoclimate proxy records. Despite these improvements in forcing magnitude in model simulations, the forcing itself is still generally applied in an unrealistic geographic manner, across most of the Labrador Sea rather than only along the Labrador coast. We present additional experiments using the CCSM3, with an ocean model resolution only slightly coarser than that used in previous eddy-resolving simulations, to test the sensitivity to freshwater forcing location. When revised freshwater forcing is applied across the Labrador Sea, the AMOC is reduced by about 40% and climate anomalies compare well with proxy records of the 8.2 ka event in terms of magnitude and duration. When the forcing is added only along the Labrador coast, however, most meltwater joins the subtropical gyre and travels to the subtropics with minor impact to the AMOC (about 10% decrease). It is likely that model biases in the placement of the North Atlantic Current remain an important limitation for correctly simulating the 8.2 ka event, though the effects of icebergs or alternative freshwater sources cannot be completely

  2. 秦岭地区15 ka BP以来的植被与环境%The vegetational and environmental history in Qinling Mountain since 15 ka BP

    Institute of Scientific and Technical Information of China (English)

    赵先贵; 肖玲

    2003-01-01

    通过对秦岭海拔2 200 m一山间盆地沼泽沉积剖面的花粉分析和14C年代测定,结合对该区植被与表土花粉的研究,认为秦岭的暗针叶林带15 ka BP以来植被和环境经历了4个发展阶段:(1) 约15 450~6 760 a BP,植被为冷杉(Abies)-云杉(Picea)林,气候寒冷潮湿;(2) 约6 760~2 940 a BP,沉积物中花粉稀少,以冷杉、云杉、桦(Betula)、栎(Quercus)为主,出现了喜暖型植物桤木(Alnus),气候暖湿;(3) 2 940~40 a BP,植被为冷杉林,气候冷湿;(4) 0~40 a BP,植被为桦、栎、榛(Corylus)、桤木、铁杉(Tsuga)和小片状分布的冷杉,松(Pinus)的数量极少,气候向暖干方向发展,这是近期人为活动干扰的结果.

  3. Post-glacial flooding of the Bering Land Bridge dated to 11 cal ka BP based on new geophysical and sediment records

    Science.gov (United States)

    Jakobsson, Martin; Pearce, Christof; Cronin, Thomas M.; Backman, Jan; Anderson, Leif G.; Barrientos, Natalia; Björk, Göran; Coxall, Helen; de Boer, Agatha; Mayer, Larry A.; Mörth, Carl-Magnus; Nilsson, Johan; Rattray, Jayne E.; Stranne, Christian; Semiletov, Igor; O'Regan, Matt

    2017-08-01

    The Bering Strait connects the Arctic and Pacific oceans and separates the North American and Asian landmasses. The presently shallow ( ˜ 53 m) strait was exposed during the sea level lowstand of the last glacial period, which permitted human migration across a land bridge today referred to as the Bering Land Bridge. Proxy studies (stable isotope composition of foraminifera, whale migration into the Arctic Ocean, mollusc and insect fossils and paleobotanical data) have suggested a range of ages for the Bering Strait reopening, mainly falling within the Younger Dryas stadial (12.9-11.7 cal ka BP). Here we provide new information on the deglacial and post-glacial evolution of the Arctic-Pacific connection through the Bering Strait based on analyses of geological and geophysical data from Herald Canyon, located north of the Bering Strait on the Chukchi Sea shelf region in the western Arctic Ocean. Our results suggest an initial opening at about 11 cal ka BP in the earliest Holocene, which is later than in several previous studies. Our key evidence is based on a well-dated core from Herald Canyon, in which a shift from a near-shore environment to a Pacific-influenced open marine setting at around 11 cal ka BP is observed. The shift corresponds to meltwater pulse 1b (MWP1b) and is interpreted to signify relatively rapid breaching of the Bering Strait and the submergence of the large Bering Land Bridge. Although the precise rates of sea level rise cannot be quantified, our new results suggest that the late deglacial sea level rise was rapid and occurred after the end of the Younger Dryas stadial.

  4. Oxygen Isotopes and Meltwater: Younger Dryas and 8.2 ka Event

    Science.gov (United States)

    Keigwin, L. D.

    2015-12-01

    Delta 18-O is one of our most powerful and widely used proxies, with, arguably, the fewest likely unknown unknowns. Here I will consider the d18-O evidence for the two best-known floods of mostly liquid water to the ocean, the Younger Dryas (YD) and the 8.2 ka event. The first d18-O signal of a meltwater flood in the ocean was reported 40 years ago by Kennett and Shackleton (1975) and that paper led directly to the meltwater diversion hypothesis for the origin of the YD cooling. It was later suggested by Rooth (1982) that such a flood could interrupt Nordic seas convection and trigger the YD cold episode. It was reported at this meeting last year that a candidate flood has been found in the Mackenzie River region of the western Arctic based on low d18-O and multiple other lines of evidence. The 8.2 ka event was about one-tenth the duration of the YD but with possibly higher transport, and is more difficult to detect in open marine sediments. As with the YD, it has been modeled by hosing and low salinities have been derived by temperature correcting the d18-O. The resulting low salinity was shown not to follow the prediction of the highest resolution modeling, and theory, that the fresh water would be transported mostly equatorward along the continental shelf. However, I report here that the low d18-O signal of the 8.2 ka flooding is present in new cores from near Logan Canyon on the Scotian shelf break, and in Jordan Basin, Gulf of Maine. These results substantially validate the modeling of Condron and Winsor that fresh water transport must have been along the continental shelf.

  5. 柴达木盆地大浪滩130ka BP以来的孢粉组合与古气候%Sporo-pollen assemblage and palaeoenvironment since 130 ka BP in Dalangtan Lake of Qaidarn Basin

    Institute of Scientific and Technical Information of China (English)

    侯献华; 郑绵平; 杨振京; 杨庆华; 毕志伟

    2011-01-01

    This paper obtained the data of the cores based on U-series age from ZK02 borehole at ridge of Dalangtan in the western Qaidam basin, where 34 samples from the sludge containing gypsum silt were selected of select for 130 ka BP (90.5 m and above) and the pollen analysis was done. Based on the pollen characteristics, the assemblage of the pollen from the bottom upwards can be divided into six zones to analyze the ancient vegetation succession in the last interglacial (130 ka BP) state in this area. The results showed as follows: in the period of 130 ka BP (the last interglacial period), the vegetation in the western Qaidam basin obviously changed compared with the very significant environment. Overall, the spruce, fir and pine trees consisted of some cold temperate coniferous forest had expanded for five times to the surrounded Zhongshan area, and even extends towards the basin. But thegrass of Gramineae, Compositae, Artemisia as the main component occupied the basin, which showed the climate that was mild climate controlled by the summer monsoon flow from the East Asia to the West, while vegetation flourished, the enhanced soil expanded, water being desalinized, the lake larger in the interstadial period, particularly that in the first pollen assemblage I ( 130 -92 ka BP) and the pollen assemblage IV (56.2 -49 ka BP) in the duration of sedimentation when the plant diversity increased. In addition to the grassland vegetation in the basin, on the wetlands around the lake the plant was growing quite flonrishing, which demonstrated that the two periods were the most enhanced summer monsoon circulation with more adequate rainfall and the forest expanding fast in the mountains. The river flow was incresing and salt lake became desaltinized. The emergent grasses were growing at the edge of the marsh in the lake area. In particular in 49 ka BP ago or so, coniferous forest was growing associated with mountain cedar. Thus it suggested that the place was affected by the

  6. Desert-steppe migration on the Loess Plateau at about 450 kaBP%黄土高原450kaBP前后荒漠草原大迁移研究

    Institute of Scientific and Technical Information of China (English)

    赵景波

    2005-01-01

    According to the field investigation, observation by an electronic microscope and x-ray identification and chemical analysis, desert-steppe migration in the Loess Plateau at about 450 kaBP was studied. The data show that gypsum illuvial horizon indicating the desert-steppe environment developed in the early stage of the formation of the fifth layer loess in Shaoling tableland in Chang'an and Bailu tableland in Xi'an of Shaanxi are situated in the southern Loess Plateau. This indicates that remarkable drying occurred, a large-scope migration of desert steppe took place toward south and the climate zone migrated 5 degrees in latitude to south which is the largest migration range indicated by geochemical indexes. The desert-steppe and more wild environment distributed widely on the Loess Plateau at that time. The development of gypsum also indicates that the climate changed at 450 kaBP from monsoon climate to nonmonsoon climate in the Loess Plateau, and the region was not affected by summer monsoon and was in the cold and dry environment of nonmonsoon climate. Annual mean precipitation was about 200 mm, 400 mm less at that time than at present.

  7. The role of the northward-directed (sub)surface limb of the Atlantic Meridional Overturning Circulation during the 8.2 ka event

    Science.gov (United States)

    Tegzes, A. D.; Jansen, E.; Telford, R. J.

    2014-10-01

    The so-called "8.2 ka event" is widely regarded as a major Holocene climate perturbation. It is most readily identifiable in the oxygen-isotope records from Greenland ice cores as an approximately 160-year-long cold interval between 8250 and 8090 years BP. The prevailing view has been that the cooling over Greenland, and potentially over the northern North Atlantic at least, was triggered by the catastrophic final drainage of the Agassiz-Ojibway proglacial lake as part of the remnant Laurentide Ice Sheet collapsed over Hudson Bay at around 8420 ± 80 years BP. The consequent freshening of surface waters in the northern North Atlantic Ocean and the Nordic Seas resulted in weaker overturning, and hence reduced northward ocean heat transport. We have reconstructed variations in the strength of the eastern branch of the Atlantic Inflow into the Nordic Seas around the time of the lake outbursts. While the initial freshwater forcing may have been even larger than originally thought, as the lake outbursts may have been accompanied by a major iceberg discharge from Hudson Bay, our proxy records from the mid-Norwegian Margin do not evidence a uniquely large slowdown in the eastern branch of the Atlantic Inflow at the time. Therefore, its main role in the 8.2 ka event may have been the (rapid) advection of fresh and cold waters to high northern latitudes, initiating rapid sea-ice expansion and an increase in surface albedo.

  8. 天山乌鲁木齐河源区3.6 ka BP以来的植被变化和环境变迁:以大西沟剖面为例%Vegetation Changes and Environmental Evolution in the Urumqi River Head,Central Tianshan Mountains Since 3.6 ka BP:a Case Study of Daxigou Profile

    Institute of Scientific and Technical Information of China (English)

    张芸; 孔昭宸; 杨振京; 阎顺; 倪健

    2004-01-01

    A relatively high resolution pollen record and data of loss of ignition (LOI), grain size and susceptibility of the Daxigou profile in the head area of the Urumqi River, central Tianshan Mountains,revealed new information about vegetation changes and environmental evolution since 3.6 ka BP. Results showed that from 3.6 ka BP to present, climate was unstable with multi-changes of warming-cooling and wetting-drying. From ca. 3.6 to 3.2 ka BP, climate was warmer and more humid than today. Climate changed to cooler and drier between ca. 3.2 and 2.0 ka BP, coinciding with a glacier advance in the head area of the Urumqi River. From ca. 2.0 to 1.4 ka BP, climate became warmer and more humid again. From ca. 1.4 to 0.5 ka BP temperature and humidity went on increasing and a period of Climatic Optimum since 3.6 ka BP might occur. A few limnetic hydrophytes pollen are counted for all zones, indicating a freshwater habitat since 3.6 ka BP in this region. Based on synthetically analysis of ecological characteristics and dispersal of spruce pollen, the abundance of Picea is influenced by treeline moving upward, valley wind and glacier ablation. Statistics of charcoal concentration and susceptibility further suggest that fires may have occurred in this region since 0.5 ka BP and the peak value of charcoal might be related to human activities.%天山乌鲁木齐河源区大西沟剖面孢粉鉴定结果表明:在3.6~3.2 ka BP,该区气候较今温暖湿润;在3.2~2.0 ka BP,气候变为寒冷干燥,这一时期乌鲁木齐河源地区曾出现一次冰进;在2.0~1.4 ka BP,气候又转为暖湿;在1.4~0.5 ka BP,出现了3.6 ka BP以来气候最适宜的时期.整个剖面自下而上都有一定量的淡水水生植物出现,这反映了该剖面3 ka BP以来一直处于淡水沼泽的环境中.通过对云杉属生态习性、传播特性等综合分析,认为剖面中的云杉丰值可能与林线上移、山谷风搬运以及冰川退缩等有一定的相关性.通过

  9. The 8.2 ka cooling event caused by Laurentide ice saddle collapse

    Science.gov (United States)

    Matero, I. S. O.; Gregoire, L. J.; Ivanovic, R. F.; Tindall, J. C.; Haywood, A. M.

    2017-09-01

    The 8.2 ka event was a period of abrupt cooling of 1-3 °C across large parts of the Northern Hemisphere, which lasted for about 160 yr. The original hypothesis for the cause of this event has been the outburst of the proglacial Lakes Agassiz and Ojibway. These drained into the Labrador Sea in ∼0.5-5 yr and slowed the Atlantic Meridional Overturning Circulation, thus cooling the North Atlantic region. However, climate models have not been able to reproduce the duration and magnitude of the cooling with this forcing without including additional centennial-length freshwater forcings, such as rerouting of continental runoff and ice sheet melt in combination with the lake release. Here, we show that instead of being caused by the lake outburst, the event could have been caused by accelerated melt from the collapsing ice saddle that linked domes over Hudson Bay in North America. We forced a General Circulation Model with time varying meltwater pulses (100-300 yr) that match observed sea level change, designed to represent the Hudson Bay ice saddle collapse. A 100 yr long pulse with a peak of 0.6 Sv produces a cooling in central Greenland that matches the 160 yr duration and 3 °C amplitude of the event recorded in ice cores. The simulation also reproduces the cooling pattern, amplitude and duration recorded in European Lake and North Atlantic sediment records. Such abrupt acceleration in ice melt would have been caused by surface melt feedbacks and marine ice sheet instability. These new realistic forcing scenarios provide a means to reconcile longstanding mismatches between proxy data and models, allowing for a better understanding of both the sensitivity of the climate models and processes and feedbacks in motion during the disintegration of continental ice sheets.

  10. Timing and duration of climate variability during the 8.2 ka event reconstructed from four speleothems from Germany

    Science.gov (United States)

    Wenz, Sarah; Scholz, Denis; Spötl, Christoph; Plessen, Birgit; Mischel, Simon; Breitenbach, Sebastian F. M.; Jochum, Klaus Peter; Fohlmeister, Jens

    2016-04-01

    The most prominent climate anomaly of the Holocene is the 8.2 ka event, which reflects the impact of a dramatic freshwater influx into the North Atlantic during an interglacial climate state. Thus, it can be considered as a possible analogue for future climate change. Due to the short-lived nature of the event (160.5 ± 5.5 years; Thomas et al., 2007), a detailed investigation requires archives of both high temporal resolution and accurate chronology. We present high-resolution stable oxygen and carbon isotope (ca. 3-4 years) as well as sub-annually resolved trace element records of the 8.2 ka event from stalagmites (BB-3, Bu4, HLK2 and TV1) from three cave systems in Germany (Blessberg Cave, Bunker Cave and Herbstlabyrinth). The location of these caves in central European is well suited in order to detect changes in temperature and precipitation in relation to changes in the North Atlantic region (Fohlmeister et al., 2012). The 8.2 ka event is clearly recorded as a pronounced negative excursion in the δ18O values of all four speleothems. While stalagmites BB-3 from Blessberg Cave and Bu4 from Bunker Cave also show a negative excursion in the δ13C values during the event, the two speleothems from Herbstlabyrinth show no distinctive features in their δ13C values. The timing, duration and structure of the event differ between the individual records. In BB-3, the event occurs earlier (ca. 8.4 ka) and has a relatively short duration of ca. 90 years. In Bu4, the event occurs later (ca. 8.1 ka) and shows a relatively long duration of more than 200 years. In the two speleothems from the Herbstlabyrinth, the event is replicated and has a timing between 8.3 and 8.1 ka and a duration of ca. 150 years. These differences may at least in part be related to the dating uncertainties of 100-200 years (95 % confidence limits). References: Fohlmeister, J., Schroder-Ritzrau, A., Scholz, D., Spötl, C., Riechelmann, D.F.C., Mudelsee, M., Wackerbarth, A., Gerdes, A., Riechelmann, S

  11. Evidence of the Pan-Lake Stage in the Period of 40- 28 ka B.P. on the Qinghai-Tibet Plateau

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    The Qinghai-Tibet plateau is one of major saline lake regions in China, where saline lakes are widespread and constitute an important object of researches on the palaeoclimatic change in the region. On the basis of comprehensive investigations of the evolution of the lake's surface and sediments on the plateau, the authors have further demonstrated the existence of a pan-lake stage (river and lake flooding stage) on the Qinghai-Tibet plateau during the period of about 40+- 28 ka B.P. and analyzed the palaeoclimatic characteristics of the pan-lake period and relationships between the ancient monsoons and the uplift of the plateau since the beginning of the Quaternary.

  12. Abrupt climate change of East Asian Monsoon at 130 kaBP inferred from a high resolution stalagmite δ18O record

    Institute of Scientific and Technical Information of China (English)

    JIANG Xiuyang; WANG Yongjin; KONG Xinggong; WU Jiangying; SHAO Xiaohua; XIA Zhifeng; CHENG Hai

    2005-01-01

    230Th ages and oxygen isotope data of a stalagmite from Shanbao Cave in Hubei Province characterize the East Asian Monsoon precipitation from 133 to127 ka. The decadal-scale high-resolution δ18O record reveals a detailed transitional process from the Penultimate Glaciation to the Last Interglaciation. As established with 230Th dates, the age of the Termination II is determined to be 129.5±1.0 kaBP, which supports the Northern Hemisphere insolation as the triggers for the ice-age cycles. In our δ18O record, the glacial/ interglacial fluctuation reaches about 4‰, almost the same level as in other Asian Monsoon cave stalagmite δ18O records. The transition of the glacial/interglacial period in our record can be recognized as four stepwise stages, among which, a rapid rise of monsoon precipitation follows the stage of "Termination II pause". The rapid rise is synchronous with the abrupt change of global methane concentration, which reflects that an increase in both Asian Monsoon precipitation and tropical wetland plays an important role in the global climate changes.

  13. A compilation of Western European terrestrial records 60-8 ka BP: towards an understanding of latitudinal climatic gradients

    Science.gov (United States)

    Moreno, Ana; Svensson, Anders; Brooks, Stephen J.; Connor, Simon; Engels, Stefan; Fletcher, William; Genty, Dominique; Heiri, Oliver; Labuhn, Inga; Perşoiu, Aurel; Peyron, Odile; Sadori, Laura; Valero-Garcés, Blas; Wulf, Sabine; Zanchetta, Giovanni

    2014-12-01

    Terrestrial records of past climatic conditions, such as lake sediments and speleothems, provide data of great importance for understanding environmental changes. However, unlike marine and ice core records, terrestrial palaeodata are often not available in databases or in a format that is easily accessible to the non-specialist. As a consequence, many excellent terrestrial records are unknown to the broader palaeoclimate community and are not included in compilations, comparisons, or modelling exercises. Here we present a compilation of Western European terrestrial palaeo-records covering, entirely or partially, the 60-8-ka INTIMATE time period. The compilation contains 56 natural archives, including lake records, speleothems, ice cores, and terrestrial proxies in marine records. The compilation is limited to include records of high temporal resolution and/or records that provide climate proxies or quantitative reconstructions of environmental parameters, such as temperature or precipitation, and that are of relevance and interest to a broader community. We briefly review the different types of terrestrial archives, their respective proxies, their interpretation and their application for palaeoclimatic reconstructions. We also discuss the importance of independent chronologies and the issue of record synchronization. The aim of this exercise is to provide the wider palaeo-community with a consistent compilation of high-quality terrestrial records, to facilitate model-data comparisons, and to identify key areas of interest for future investigations. We use the compilation to investigate Western European latitudinal climate gradients during the deglacial period and, despite of poorly constrained chronologies for the older records, we summarize the main results obtained from NW and SW European terrestrial records before the LGM.

  14. Landscape transformations at the dawn of agriculture in southern Syria (10.7-9.9 ka cal. BP): Plant-specific responses to the impact of human activities and climate change

    Science.gov (United States)

    Arranz-Otaegui, Amaia; López-Sáez, José Antonio; Araus, José Luis; Portillo, Marta; Balbo, Andrea; Iriarte, Eneko; Gourichon, Lionel; Braemer, Frank; Zapata, Lydia; Ibáñez, Juan José

    2017-02-01

    In southwest Asia, the accelerated impact of human activities on the landscape has often been linked to the development of fully agricultural societies during the middle and late Pre-Pottery Neolithic B (PPNB) period (around 10.2-7.9 ka cal. BP). This work contributes to the debate on the environmental impact of the so-called Neolitisation process by identifying the climatic and anthropogenic factors that contributed to change local and regional vegetation at the time when domesticated plants appeared and developed in southern Syria (around 10.7-9.9 ka cal. BP). In this work a multidisciplinary analysis of plant microremains (pollen and phytoliths) and macroremains (wood charcoal) is carried out along with stable carbon isotope discrimination of wood charcoals in an early PPNB site (Tell Qarassa North, west of the Jabal al-Arab area). Prior to 10.5 ka cal. BP, the results indicate a dynamic equilibrium in the local and regional vegetation, which comprised woodland-steppe, Mediterranean evergreen oak-woodlands, wetland vegetation and coniferous forests. Around 10.5-9.9 ka cal. BP, the elements that regulated the vegetation system changed, resulting in reduced proportions of arboreal cover and the spread of cold-tolerant and wetlands species. Our data show that reinforcing interaction between the elements of the anthropogenic (e.g. herding, fire-related activities) and climatic systems (e.g. temperature, rainfall) contributed to the transformation of early Holocene vegetation during the emergence of fully agricultural societies in southern Syria.

  15. The role of the northward-directed (subsurface limb of the Atlantic Meridional Overturning Circulation during the 8.2 ka Event

    Directory of Open Access Journals (Sweden)

    A. D. Tegzes

    2014-02-01

    Full Text Available The so-called "8.2 ka Event" has been widely regarded as a major climate perturbation over the Holocene. It is most readily identifiable in the oxygen-isotope records from Greenland ice cores as an approximately 160 yr-long cold interval between 8250–8090 yr BP. The prevailing view has been that the cooling over Greenland, and potentially over the northern North Atlantic at least, was triggered by the catastrophic final drainage of the Agassiz-Ojibway proglacial lake as part of the remnant Laurentide Ice Sheet collapsed over Hudson Bay at around 8420 ± 80 yr BP. The consequent freshening of surface waters in the northern North Atlantic Ocean and the Nordic Seas resulted in weaker overturning, hence reduced northward heat transport. Here we present proxy records from site JM97-MD95-2011 on the mid-Norwegian Margin indicating a (sharp decline in the strength of the eastern branch of the Atlantic Inflow into the Nordic Seas immediately following a uniquely large drop in (subsurface ocean temperatures coeval with the lake outbursts. We propose that the final drainage of Lake Agassiz-Ojibway was accompanied by a major iceberg discharge from Hudson Bay, which resulted in the cooling of the northward-directed northern Gulf Stream-North Atlantic Drift-Norwegian Atlantic Current system. Since our current-strength proxy records from the mid-Norwegian Margin do not evidence an exceptionally strong reduction in the main branch of the Atlantic Inflow into the Nordic Seas at the time, we argue that a chilled northward-directed (subsurface-current system and an already colder background climate state could be the main factors responsible for the 8.2 ka climate perturbation.

  16. Climatic forcing before, during, and after the 8.2 Kyr B.P. global cooling event

    Indian Academy of Sciences (India)

    Devendra Lal; William G Large; Stephan G Walker

    2007-06-01

    This paper attempts at full characterization of the unique global 8.2Kyr B.P. cooling event. Significant atmospheric cooling started during 9.5–8.5Kyr B.P. when the Sun was extremely quiet during three periods of ∼50–100 years. The flood of melt water in the N. Atlantic from glacial lakes during the demise of the Laurentide ice sheet, starting at ∼8.5Kyr B.P., adds to the atmospheric cooling. Climatic forcing events occurred at 8.5Kyr B.P., at 8.2Kyr B.P. and finally at 8.06Kyr B.P., leading to concurrent increases or decreases in the atmospheric 14C levels, completely consistent with the climatic forcing proposed here.

  17. Micromorphology of the loess-paleosol sequence of the last 130 ka in China and paleoclimatic events

    Institute of Scientific and Technical Information of China (English)

    郭正堂; N.Fedoroff; 刘东生

    1996-01-01

    The Late Quaternary loess-soil sequences in Xifeng, Luochuan and Weinan are studied to investigate the micromorphology of both loess and paleosols. Many features have clear climatic implications and may be used as indications for morpho-stratigraphic and climatic correlation. The temporal and spatial variations of these features allow us to define 16 climatic events for the last 130 ka, which are highly consistent with the variations in palco-weathering intensity. Part of these events are attributable to the orbital forcing while others are more or less synchronous with the Heinrich events recorded in the North Atlantic Ocean. During the last events, the Loess Plateau was characterized by sparse vegetation cover and strong winds while the climatic conditions between these events were considerably humid, resulting in a significant steppe cover.

  18. Norwegian Sea warm pulses during Dansgaard-Oeschger stadials: Zooming in on these anomalies over the 35-41 ka cal BP interval and their impacts on proximal European ice-sheet dynamics

    Science.gov (United States)

    Wary, Mélanie; Eynaud, Frédérique; Rossignol, Linda; Lapuyade, Joanna; Gasparotto, Marie-Camille; Londeix, Laurent; Malaizé, Bruno; Castéra, Marie-Hélène; Charlier, Karine

    2016-11-01

    The last glacial millennial climatic events (i.e. Dansgaard-Oeschger and Heinrich events) constitute outstanding case studies of coupled atmosphere-ocean-cryosphere interactions. Here, we investigate the evolution of sea-surface and subsurface conditions, in terms of temperature, salinity and sea ice cover, at very high-resolution (mean resolution between 55 and 155 years depending on proxies) during the 35-41 ka cal BP interval covering three Dansgaard-Oeschger cycles and including Heinrich event 4, in a new unpublished marine record, i.e. the MD99-2285 core (62.69°N; -3.57s°E). We use a large panel of complementary tools, which notably includes dinocyst-derived sea-ice cover duration quantifications. The high temporal resolution and multiproxy approach of this work allows us to identify the sequence of processes and to assess ocean-cryosphere interactions occurring during these periodic ice-sheet collapse events. Our results evidence a paradoxical hydrological scheme where (i) Greenland interstadials are marked by a homogeneous and cold upper water column, with intensive winter sea ice formation and summer sea ice melting, and (ii) Greenland and Heinrich stadials are characterized by a very warm and low saline surface layer with iceberg calving and reduced sea ice formation, separated by a strong halocline from a less warm and saltier subsurface layer. Our work also suggests that this stadial surface/subsurface warming started before massive iceberg release, in relation with warm Atlantic water advection. These findings thus support the theory that upper ocean warming might have triggered European ice-sheet destabilization. Besides, previous paleoceanographic studies conducted along the Atlantic inflow pathways close to the edge of European ice-sheets suggest that such a feature might have occurred in this whole area. Nonetheless, additional high resolution paleoreconstructions are required to confirm such a regional scheme.

  19. Investigating the impact of Lake Agassiz drainage routes on the 8.2 ka cold event with a climate model

    Directory of Open Access Journals (Sweden)

    Y.-X. Li

    2009-08-01

    Full Text Available The 8.2 ka event is the most prominent abrupt climate change in the Holocene and is often believed to result from catastrophic drainage of proglacial lakes Agassiz and Ojibway (LAO that routed through the Hudson Bay and the Labrador Sea into the North Atlantic Ocean, and perturbed Atlantic meridional overturning circulation (MOC. One key assumption of this triggering mechanism is that the LAO freshwater drainage was dispersed over the Labrador Sea. Recent data, however, show no evidence of lowered δ18O values, indicative of low salinity, from the open Labrador Sea around 8.2 ka. Instead, negative δ18O anomalies are found close to the east coast of North America, extending as far south as Cape Hatteras, North Carolina, suggesting that the freshwater drainage may have been confined to a long stretch of continental shelf before fully mixing with North Atlantic Ocean water. Here we conduct a sensitivity study that examines the effects of a southerly drainage route on the 8.2 ka event with the ECBilt-CLIO-VECODE model. Hosing experiments of four routing scenarios, where freshwater was introduced to the Labrador Sea in the northerly route and to three different locations along the southerly route, were performed to investigate the routing effects on model responses. The modeling results show that a southerly drainage route is possible but generally yields reduced climatic consequences in comparison to those of a northerly route. This finding implies that more freshwater would be required for a southerly route than for a northerly route to produce the same climate anomaly. The implicated large amount of LAO drainage for a southerly routing scenario is in line with a recent geophysical modelling study of gravitational effects on sea-level change associated with the 8.2 ka event, which suggests that the volume of drainage might be larger than previously estimated.

  20. Koroška Bela alluvial fan – The result of the catastrophic slope events; (Karavanke Mountains, NW Slovenia

    Directory of Open Access Journals (Sweden)

    Jernej Jež

    2008-12-01

    Full Text Available The Koroška Bela alluvial fan deposits were investigated to determine the genesis of the fan and the source area of sediments. The alluvial fan is composed of a sequence of diamicton layers, and related subaeric sediments that were deposited by multiple mass flow events, in some cases certainly by debris flows. The predominant sources ofsediments are tectonically deformed clastic and partly carbonate Carbonifferous and Permian rocks. In diamictons also pebbles of other rocks from the hinterland are present. These were eroded from the channel of Bela during the mass flow events. We estimate the future debris flow hazard along Bela stream as high.

  1. Investigating the impact of Lake Agassiz drainage routes on the 8.2 ka cold event with climate modeling

    Directory of Open Access Journals (Sweden)

    Y.-X. Li

    2009-03-01

    Full Text Available The 8.2 ka event is the most prominent abrupt climate change in the Holocene and is widely believed to result from catastrophic drainage of proglacial lakes Agassiz and Ojibway (LAO that routed through the Hudson Bay and the Labrador Sea into the North Atlantic Ocean, and perturbed Atlantic meridional overturning circulation (MOC. One key assumption of this triggering mechanism is that the LAO freshwater drainage was spread over the Labrador Sea. Recent data, however, show no evidence of lowered δ18O values from the open Labrador Sea around 8.2 ka. Instead, negative δ18O anomalies are found close to the east coast of North America, extending as far south as Cape Hatteras, North Carolina, suggesting that the freshwater drainage was probably confined to a long stretch of continental shelf before fully mixing with North Atlantic Ocean water. Here we conduct a sensitivity study that examines the effects of this southerly drainage route on the 8.2 ka event with the ECBilt-CLIO-VECODE model. Hosing experiments of four different routing scenarios, where freshwater was introduced to the Labrador Sea in the northerly route (R1 and to three different locations (Grand Banks – R2, George Bank – R3, and Cape Hatteras – R4 on the southerly route, were performed with 0.45 m sea-level equivalent (SLE, 0.90 m SLE, and 1.35 m SLE of freshwater introduced over 5 years to investigate the routing effects on model responses. The modelling results show that a southerly drainage route is plausible but generally yields reduced climatic consequences in comparison to those of a northerly route. This finding implies that more freshwater would be required for a southerly route than for a northerly route to produce the same climate anomaly.

  2. Advection of Atlantic Water to the Western and Northern Svalbard Shelves Through the Last 17.5 ka cal yr BP

    Science.gov (United States)

    Slubowska, M. A.; Rasmussen, T. L.; Koc, N.; Kristensen, D. K.; Nilsen, F.; Solheim, A.

    2005-12-01

    We have studied the distribution of benthic foraminifera species together with planktonic and benthic foraminifera abundances, stable oxygen isotopes and lithology in two cores: JM02-440 from the western (77° 22' N, 12° 48' E, 240 m water depth) and NP94-51 from the northern (80° 21' N and 16 ° 17' E, 400 m water depth) shelf of Svalbard. The purpose of the study was to reconstruct the changes in flow and character of the relatively warm Atlantic Water through the last 17.5 ka cal yr BP. The results from these two sites were compared with previously published records from the eastern Nordic Seas in order to follow the history of the advection of Atlantic Water as it moved northwards along the Norwegian coast and into the Arctic Ocean. Our results indicate that synchronous oceanographic changes occurred at the western and northern Svalbard shelves. The benthic foraminifera and oxygen isotope records indicate almost continuous presence of the Atlantic Water at the shelf areas since the deglaciation. The Bolling-Allerod period stands out as the warmest period in our records with the highest bottom waters temperatures indicating strong inflow of Atlantic Water. However, the warm Atlantic Water was isolated below cold and probably sea ice covered surface waters in contrast to the surface waters along the Norwegian coast, which experienced enhanced temperatures. During the Younger Dryas a freshening of the bottom waters occurred and the Polar Front was located in a proximal position to both sites. The strong inflow of saline, but chilled Atlantic Water happened during the Early Holocene. A distinct cooling and freshening of the bottom water masses occurred during the Mid- and Late Holocene, and was accompanied by glacier re-advances leading to the present-day conditions. During the last millennium, the inflow of Atlantic Water appears to increase, but the conditions turned unstable. The development of the paleoceanographic conditions at the western and northern

  3. 最近12 000年来青藏高原植被的时空分布%Temporal-Spatial Distribution of Vegetation in the Qinghai-Xizang Plateau During the Past 12 ka BP

    Institute of Scientific and Technical Information of China (English)

    唐领余

    2002-01-01

    青藏高原30个点湖泊的孢粉记录综合研究显示: 在进入全新世之前(12 ka BP以前),除最东南部外,高原从东到西均发育为荒漠草原植被.全新世早期(12.0-9.0 ka BP)高原东南部(104°-98° E)为落叶阔叶林/针阔叶混交林; 中部(98°-92° E)为草甸或灌丛草甸,再向西至80° E左右为草原植被; 全新世中期(9.0-3.2 ka BP)高原由东向西古植被依次发育为针阔混交林和硬叶阔叶林(104°-98° E)→针阔混交林(98°-94° E)→灌丛草甸(94°-92° E)→草原(92°-80° E);全新世晚期(3.2 ka BP以后)由东向西古植被依次为硬叶阔叶林→针阔混交林→草甸→草原→荒漠.%Comprehensive studies on the basis of pollen records from lake cores at 30 sites in the Qinghai-Xizang Plateau have been used to reconstruct temporal-spatial distributions of Holocene vegetations. Before the Holocene (prior to 12.0 ka BP) desert steppe vegetation was developed from the east to the west in the most parts of the Plateau, with a few exceptions in the extreme southeastern appeared. During the early Holocene (12.0-9.0 ka BP),deciduous broad-leaved forest/conifer and broad-leaved deciduous mixed forest were distributed in the east of Plateau (104°-98° E). Meadows or shrub meadow appeared in the middle of the Plateau (98°-92° E). Farther west to about 80° E, a steppe landscape was present. During the middle Holocene (9.0-3.2 ka BP), the palaeovegetations were sequentially conifer and broad-leaved deciduous mixed forest and sclerophyllous broad-leaved forest (104°-98° E)-conifer and broad-leaved deciduous mixed forest (98°-94° E)-shrub meadow (94°-92° E)-steppe (92°-80° E). During the late Holocene (after 3.2 ka BP), the palaeovegetations were sequentially sclerophyllous broad-leaved forest-conifer and broad-leaved deciduous mixed forest-meadow-steppe-desert from east to west of the Plateau.

  4. Modelling long-term (300ka) upland catchment response to multiple lava damming events

    NARCIS (Netherlands)

    van Gorp, W.; Temme, A. J. A. M.; Veldkamp, A.; Schoorl, J. M.

    2015-01-01

    Landscapes respond in complex ways to external drivers such as base level change due to damming events. In this study, landscape evolution modelling was used to understand and analyse long-term catchment response to lava damming events. PalaeoDEM reconstruction of a small Turkish catchment (45km(2))

  5. Modelling long-term (300¿ka) upland catchment response to multiple lava damming events

    NARCIS (Netherlands)

    Gorp, van W.; Temme, A.J.A.M.; Veldkamp, A.; Schoorl, J.M.

    2015-01-01

    Landscapes respond in complex ways to external drivers such as base level change due to damming events. In this study, landscape evolution modelling was used to understand and analyse long-term catchment response to lava damming events. PalaeoDEM reconstruction of a small Turkish catchment (45¿km2)

  6. A coccolithophore based view on paleoenvironmental changes in the open ocean mid-latitude North Atlantic between 130 and 48ka BP with special emphasis on MIS 5e

    DEFF Research Database (Denmark)

    Schwab, C.; Kinkel, Hanno; Weinelt, M.

    2013-01-01

    past changes in productivity and hydrography from a new sediment core (MD08-3179Cq) taken in the open ocean mid-latitude North Atlantic in the vicinity of the Azores Current System. Concomitant to the reorganizations of environmental conditions in the North Atlantic between 130 and 48ka BP, changes......As oceanographic changes in the North Atlantic are known to modulate global climate, they are key to the understanding of past and future climate changes. Especially the mid-latitudes of the open ocean North Atlantic may be of interest, regarding the large area covered. We therefore reconstructed...

  7. Tephrochronology of a 70 ka-long marine record in the Marsili Basin (southern Tyrrhenian Sea)

    Science.gov (United States)

    Tamburrino, S.; Insinga, D. D.; Pelosi, N.; Kissel, C.; Laj, C.; Capotondi, L.; Sprovieri, M.

    2016-11-01

    A sequence of tephra layers is studied in a 13.9 m-long deep-sea core (MD01-2474G) from the southern Tyrrhenian Sea. The chronology of the succession is provided by a high-resolution age-depth model based on isotope stratigraphy and AMS radiocarbon dating, which place the succession of events in a time interval spanning the last 70 ka. Based on a precise chronological framework and proximal-distal correlations, the Y-1, Y-6 and Y-7 main marker tephras were identified. Compositional data on fresh micro-pumice or glass shards of selected tephras were correlated with the coeval volcanic activity of Aeolian Arc (Vulcano and Salina), Mt. Etna, Phlegrean Fields Pantelleria and Ischia. The tephra sequence contains a number of deposits documenting recurrent activity on Vulcano Island at ca. 6.9 ka BP (MD3), ca. 16.7 ka BP (MD11), ca. 23.2 ka BP (MD14), ca. 29.6 ka BP (MD15), ca. 36.9 ka BP (MD22) and ca. 42.5 ka BP (MD27). The results presented in this study improve the southern Tyrrhenian Sea tephrostratigraphic framework and provide new insights into chemistry and dispersal area of Aeolian Arc pyroclastic deposits in this sector of the Central Mediterranean.

  8. Green mosses date the Storegga tsunami to the chilliest decades of the 8.2 ka cold event

    Science.gov (United States)

    Bondevik, Stein; Stormo, Svein Kristian; Skjerdal, Gudrun

    2012-06-01

    Chlorophyll in dead plants ordinarily decomposes completely before permanent burial through exposure to light, water and oxygen. Here we describe 8000-year-old terrestrial mosses that retain several percent of its original chlorophyll. The mosses were ripped of the land surface, carried 50-100 m off the Norwegian coast of the time, and deposited in depressions on the sea floor by the Storegga tsunami. A little of the chlorophyll survived because, within hours after entraining it, the tsunami buried the mosses in shell-rich sediments. These sediments preserved the chlorophyll by keeping out light and oxygen, and by keeping the pH above 7—three factors known to favour chlorophyll's stability. Because the green mosses were buried alive, their radiocarbon clock started ticking within hours after the Storegga Slide had set off the tsunami. Radiocarbon measurement of the mosses therefore give slide ages of uncommon geological precision, and these, together with a sequence of ages above and below the boundary, date the Storegga Slide to the chilliest decades of the 8.2 ka cold event at 8120-8175 years before AD 1950. North Atlantic coastal- and fjord- climatic records claimed to show evidence of the 8.2 cold event should be carefully examined for possible contamination and disturbance from the Storegga tsunami.

  9. Social and political convergence on environmental events: the roles of simplicity and visuality in the BP Oil Spill.

    Science.gov (United States)

    Hoffbauer, Andreas; Ramos, Howard

    2014-08-01

    This paper examines how and when newspapers, environmental nongovernmental organizations, businesses, and the government converge on environmental events. Using data on the 2010 BP Oil Spill from newspaper articles in the United States, Canada, and the United Kingdom, press releases by Greenpeace and Sierra Club, press releases by BP, Halliburton, Transocean, ExxonMobil, and Shell, and press statements by the White House Press Secretary, we examine an event's potential to trigger convergence of social and political action. By treating events as political actants, we examine arguments from the agenda-setting and social movement literatures on timing, simplicity, and visuality to understand when political actors converge. We find that convergence is related to temporal cycles but not simplicity or visuality.

  10. Discovery of a large area of ice-wedge networks in Ordos:Implications for the southern boundary of permafrost in the north of China as well as for the environment in the latest 20 kaBP

    Institute of Scientific and Technical Information of China (English)

    CUI Zhijiu; YANG Jianqiang; ZHANG Wei; ZHAO Liang; XIE Youyu

    2004-01-01

    The delineation of the southern boundary of the latitudinal permafrost in the north of China in the period of late Pleistocene, i.e. the last glaciation maximum (LGM), has been hampered for two reasons. Firstly, previous studies were limited to the eastern part of the north of China, and, secondly, the ages of the permafrost had not been determined systematically. In this paper, we suggest that the southern boundary of the high latitudinal permafrost in the north of China is bounded by approximately 38-40°N (eastern part) and 37-39°N (western part) lines of latitude based on our interpretation of periglacial phenomena and their implication to the environment during the late Pleistocene, and this southern boundary is plotted for the first time. Also, we reconstruct the migration of the southern latitudinal permafrost boundary and the environment after LGM. It is proposed that two cold stages occurred in the LGM at 26 kaBP and 23-13 kaBP, when the annual mean temperature was 8-12℃ lower than at present.

  11. 南海低纬地区15kaBP以来高分辨率孢粉记录及植被、气候演变%High-resolution palynological record and evolution of vegetation and climate in the low latitude of the South China Sea since 15 kaBP

    Institute of Scientific and Technical Information of China (English)

    张玉兰; 彭学超; 赵晶

    2011-01-01

    本文依据南海低纬地区SA09-090孔高分辨率的孢粉记录,从下至上划分了4个孢粉组合带,从孢粉成分的变化,重建了15kaBP以来的植被和气候变化历史.研究结果发现:15.0-12.5kaBP期间研究区花粉主要来自当地出露的陆架,揭示出出露的陆架植被类型是以热带低山雨林和低地雨林为主.海滨地区生长着茂盛的红树林,当时气温比现在低一些,但无明显变干现象.12-10kaBP期间植被中低山雨林花粉增多,红树植物花粉减少,这说明此时海平面上升,气温也回升,花粉源区变远.全新世时(10kaBP至今),花粉主要来源于加里曼丹岛和周围岛屿,植被以低山雨林和海滨红树植物为主,但花粉浓度大幅降低,这种花粉浓度降低说明海平面继续上升,研究区距离花粉源区越来越远.全新世中期时为热、湿的气候环境,后期与现今相近.%Based on the high resolution pollen record at the Core SA09-090, which was in the low latitude of the South China Sea, four pollen zones are distinguished in an ascending order. According to the pollen composition in each zone, the vegeta-tion evolution and climate change since lSkaBP is reconstructed. The research shows that at the stage of 15.0-12.5kaBP, the pollen in the research area mainly came from the continental shelf when it was above the sea level. This indicates that the vegetation on the continental shelf that was above the sea level was mainly tropical low-mountain rainforest and lowland rainforest. Many mangroves lived in the coastal area. The temperature was a little lower than today's, but there was no clear evidence of aridity. At the stage of 12-10kaBP, the amount of pollen from lowland rainforest increased, and the amount of pollen from the mangroves decreased. This indicates that the sea level rose in that period, and the temperature rose, too. The pollen source became far away. At the Holocene (10kaBP to now), the pollen mainly came from Borneo and the

  12. Insights into rapid climate change: A high resolution, compound-specific n-alkane δD study of the 8.2 ka event (Tenaghi Philippon, Greece)

    Science.gov (United States)

    Schemmel, F.; Niedermeyer, E.; Schwab, V.; Pross, J.; Mulch, A.

    2013-12-01

    Despite being characterized as remarkably stable, the Holocene climate has experienced a number of abrupt, relatively short-term climate changes. Arguably the most prominent climate perturbation, the 8.2 ka event, was caused by the catastrophic drainage of the ice-dammed Laurentide ice-lake into the North Atlantic, leading to a severe weakening of thermohaline circulation, causing a decline in temperature and significant changes in atmospheric circulation in the Northern Hemisphere, especially in the North Atlantic realm and Europe. Being located between the climate systems of the higher and lower latitudes, the Mediterranean region is particularly susceptible to rapid climate change. Available proxy data and climate models provide first-order insight into the impact of the 8.2 ka event in this area but often lack the temporal resolution to supply information about changes in seasonality, hence severely hindering the understanding of rapid climate changes and revealing the need for high resolution terrestrial archives. Here, we present a multi-proxy, high resolution stable isotope study across the 8.2 ka event on a peat core from the classical site of Tenaghi Philippon (NE Greece). We aim to characterize the effects of changing temperature and rainfall patterns by using compound-specific δD values of the long-chain n-alkanes as a proxy for terrestrial (summer) precipitation. We compare changes in hydrogen isotopic composition to the concentration of the long-chain n-alkanes as well as to δ13Cbulk measurements of the organic material and high-resolution palynomorphic data from the same core. Analysis of 35 samples of telmatic peat shows significant decreases in concentration of the long-chain n-alkanes along with strong positive shifts in δD (over 40 ‰ in δDC29) during the 8.2 ka event. The general trend of δD of the n-Alkanes n-C27, n-C29 and n-C31 coincides with changes in δ13Cbulk, and to some degree reflects changes in moisture availability. We attribute

  13. Extreme flood events and climate change around 3500 aBP in the Central Plains of China

    Institute of Scientific and Technical Information of China (English)

    XIA; Zhengkai; WANG; Zanhong

    2004-01-01

    The Xinzhai Period (3550-3400 aBP) belongs to Late Neolithic Culture, which bridges the Longshan Culture and the Xia Culture in the Central Plains of China. By studying the living environment of ancient human beings at the Xinzhai site, Henan Province, this paper presents the discovery of extreme floods which threatened and destroyed the living environment of the ancient human beings during the Xinzhai Period. Pollen analysis and carbon-oxygen isotope measurement suggest that the climate was warm and wet during the Xinzhai Period, in contrast to the warm and arid climate during the Longshan Culture Period. The frequent flood events were the response of abrupt climate change during the Xinzhai Period. The conclusions drawn from this study not only help better understand the environmental change in the Central Plains of China around 3500 aBP, but also provide important clues to the environmental background for the origin of Chinese civilization.

  14. Evolution Process of Land Desertification around Qinghai Lake since 32 ka BP Reflected by Sediment Grain-size Features%风成沉积物粒度特征及其反映的青海湖周边近32ka以来土地沙漠化演变过程

    Institute of Scientific and Technical Information of China (English)

    胡梦珺; 李森; 高尚玉; 张登山

    2012-01-01

    湖东地区是青海湖周边土地沙漠化面积最大、程度最为严重的区域。选取青海湖湖东种羊场附近高度约为10m的风蚀残丘(大水溏剖面)为研究对象,结合高密度采样和光释光测年,在对风成沉积物的粒度组成、粒度参数及粒度敏感指标进行分析的基础上,重建了32ka以来青海湖周边的土地沙漠化演变过程。结果表明,32kaBP以来青海湖周边土地沙漠化经历了末次冰期间冰阶(32~23.4kaBP)的固结成壤期、末次冰期冰盛期(23.4~15kaBP)的快速扩张期、末次冰期冰消期(15~10.4kaBP)的缓慢减小期和全新世(10.4kaBP至今)的快速缩小期4个阶段。%Land desertification in the east coast is the most serious and has the largest area among areas a- round the Qinghai Lake. in this paper we took an aeolian sediment section at Dashuitang (QDST section) in the east coast of the Qinghai Lake as the research object to reconstruct the evolution process of land deserti- fication around Qinghai Lake during the last 32 ka by the environment evolution information extracted from grain size composition, grain size parameters and grain size sensitive index. Results show that the evolution process of land desertification in the study area can be divided into four stages since 32 ka BP. In the inter- glacial period of the Last Glacial Stage from 32 ka BP to 23.4 ka BP, the climate was humid with weak wind, and sand dunes experienced being fixed and pedogenic process. So the area of land desertification land during this period was the smallest. From 23.4 ka BP to 15.2 ka BP, the climate was cold-dry with strong wind, and the intense aeolian activities activated sand dunes. Land desertification area during this period was the biggest in the past 32 ka. In 15-10.4 ka BP, land desertification area slowly decreased under the background of increasing temperature and humidity. Since 10.4 ka BP, aeolian activities weakened

  15. Nup153 and Nup50 promote recruitment of 53BP1 to DNA repair foci by antagonizing BRCA1-dependent events.

    Science.gov (United States)

    Mackay, Douglas R; Howa, Amanda C; Werner, Theresa L; Ullman, Katharine S

    2017-10-01

    DNA double-strand breaks are typically repaired through either the high-fidelity process of homologous recombination (HR), in which BRCA1 plays a key role, or the more error-prone process of non-homologous end joining (NHEJ), which relies on 53BP1. The balance between NHEJ and HR depends, in part, on whether 53BP1 predominates in binding to damage sites, where it protects the DNA ends from resection. The nucleoporin Nup153 has been implicated in the DNA damage response, attributed to a role in promoting nuclear import of 53BP1. Here, we define a distinct requirement for Nup153 in 53BP1 intranuclear targeting to damage foci and report that Nup153 likely facilitates the role of another nucleoporin, Nup50, in 53BP1 targeting. The requirement for Nup153 and Nup50 in promoting 53BP1 recruitment to damage foci induced by either etoposide or olaparib is abrogated in cells deficient for BRCA1 or its partner BARD1, but not in cells deficient for BRCA2. Together, our results further highlight the antagonistic relationship between 53BP1 and BRCA1, and place Nup153 and Nup50 in a molecular pathway that regulates 53BP1 function by counteracting BRCA1-mediated events. © 2017. Published by The Company of Biologists Ltd.

  16. Worldwide delta initiation, the beginning of the 8.2-ka event, and the base of the Middle Holocene

    NARCIS (Netherlands)

    Cohen, K.M.; Hijma, M.P.

    2015-01-01

    Session P09 Holocene rapid climate changes. Abstract T00351 The Early Holocene is globally characterised by steady postglacial climatic warming and the drowning of continental shelves due to sea level rise (SLR). The 8.2-event sits as a superimposed event on both the climatic and the sea-level recor

  17. The Y. D. and climate abrupt events in the early and middle Holocene: Stalagmite oxygen isotope record from Maolan, Guizhou, China

    Institute of Scientific and Technical Information of China (English)

    QIN Jiaming; YUAN Daoxian; CHENG Hai; LIN Yushi; ZHANG Meiliang; WANG Fuxing; R. L. Edwards; WANG Hua; RAN Jingcheng

    2005-01-01

    The isotope records which range from 3.9 kaBP to 15.7 kaBP with an average resolution of 90 a have been obtained from 45 cm to 193.6 cm of the upper part of D4 stalagmite from Dongguo Cave in Libo, Guizhou, by using system TIMS U-series dating and carbon and oxygen stable isotope analyses.The study indicates that the last cold event, the YD (Younger Dryas) event, of the last glacial period was apparently shown in D4 record, which started from 12.80 kaBP and ended in 11.58 kaBP, with a great range of drop in temperature. The end of the last glacial period was consistent with the termination I in oceanic isotope records and was with time limit of 11.3 kaBP. The three most distinct cold events in the early and middle Holocene occurred respectively in 10.91 kaBP, 8.27 kaBP and 4.75 kaBP, with a range of drop in temperature reaching 2-5℃. The climate abrupt events in thousand and hundred years scale recorded in stalagmite δ18O can be compared to those in GISP2 ice cores from Greenland in their happening time and the range of their lasting time. The cold events in 8.27 kaBP and 4.75 kaBP can also be compared to CC3 stalagmite records in Ireland, which indicate that climate changes of short range in China monsoon areas, western Europe and polar regions, have the same driving factor. This has a global significance. In addition, the trend of record curves in some time- stages is apparently different, which reflects probably the difference between environment in monsoon climate areas and in polar regions.

  18. A high-resolution 14C chronology from the Cormor alluvial megafan (Tagliamento glacier, NE Italy) for the reconstruction of Alpine glacier activity during 50-20 ka BP

    Science.gov (United States)

    Hippe, Kristina; Fontana, Alessandro; Hajdas, Irka; Ivy-Ochs, Susan

    2016-04-01

    During the Last Glacial Maximum (LGM), the Cormor alluvial megafan was delivering large amounts of glacial sediment from the Alpine Tagliamento glacier onto the southern Alpine foreland basin. Rate and character of sedimentation were primarily controlled by the glacier activity and, thus, by variations in climate. To gain a better understanding of the late-Pleistocene sedimentary processes in the Alpine foreland alluvial megafans and their response to climate changes, we have performed high-resolution radiocarbon dating of a drilling core (PNC1, 65 m deep) located in the distal sector of the Cormor alluvial megafan, near the Marano Lagoon [1]. The stratigraphic sequence of the core is characterized by an alternation of silt and clay deposits with the intercalation of several peaty and humic horizons. These organic layers (5-40 cm thick) correspond to phases of locally inactive fluvioglacial sedimentation, allowing plant remains to be accumulated at the surface. A series of about 55 peat samples between 33 to 4 m of depth with sample distances of few cm-dm were dated with radiocarbon. Half of these samples were separated into various fractions in order to check for systematic age differences with regard to the size and/or type of the organic particles. Additionally, the influence of sample pre-treatment was evaluated by using the ABA treatment as well as two different ABOX treatment protocols for each sample fraction. While no systematic age differences with size and/or type of the organic particles was observed, some samples indicate a shift towards younger ages after ABOX treatment. Moreover, deposits containing old carbon (too old ages) were observed suggesting that a careful approach and high-resolution sampling is an imperative in obtaining accurate chronologies. Radiocarbon ages obtained for the PNC1 record range from ~50-20 cal ka BP and provide a detailed chronology of the pre-LGM and LGM fluvioglacial sequence. Due to the immediate connection of the Cormor

  19. Environmental change of Gucheng Lake of Jiangsu in the past 15 ka and its relation to palaeomonsoon

    Institute of Scientific and Technical Information of China (English)

    王苏民; 羊向东; 马燕; 潘红玺; 童国榜; 吴锡浩

    1996-01-01

    The high-resolution and multi-proxy analysis of lacustrine sediments from the Gucheng Lake has revealed the palaeodimatic and palaeoenvironmental evolutionary process since 15 ka B.P. The formation, expansion and shrinkage of the lake is closely related to monsoon rain caused by strength change of monsoon circulation which is controlled by orbit forcing. An abrupt descending of temperature occurring from 11.3 to 11.0ka B.P. may be correlative to Younger Dryas event, which trancated the monsoon climate cycle. Through the correlation with adjacent regions, it can be known that there were twice north shifts and twice south migrations for polar front of monsoon.

  20. Drowning of a barrier coastline under rapid rates of relative sea-level rise during the 8.2 ka cooling event: Cause or coincidence?

    Science.gov (United States)

    Mellett, C.; Hodgson, D. M.; Lang, A.; Mauz, B.; Plater, A. J.

    2012-12-01

    Examples where barrier landforms and deposits are preserved offshore of a highstand shoreline are rare on contemporary continental shelves, and in the rock record. Therefore, understanding of the conditions required for preservation and the sedimentary processes-response to such factors is limited and heavily dependent on simulation models. Here, an integrated dataset of multibeam bathymetry and 2D seismic reflection profiles has uncovered an exceptionally well preserved drowned barrier complex at Hastings Bank, on the English Channel continental shelf, offshore of southeast England. Mapping of nine seismic stratigraphic units calibrated with lithological information from multiple vibrocores has enabled the interpretation of fluvial, shoreface, barrier, washover fan, back-barrier and tidal environments of deposition. Stratigraphic architecture is used as the basis for landscape evolution reconstructions that reveal phases of barrier progradation, degradation and retreat. Optical Stimulated Luminescence (OSL) dating of shoreface and beach deposits revealed ages in the range of 8.4 ± 0.2 ka and 7.8 ± 0.2 ka. These ages indicate the barrier developed under rapid rates of early Holocene sea-level rise and more specifically, correlate to the time period surrounding the 8.2 ka cooling event and associated sea-level 'jump'. To preserve a barrier beach including the barrier foreshore under such rapid rates of relative sea-level rise, sediment supply would have to be sufficient to keep pace to prevent the shoreline responding through continuous reworking, i.e. rollover. Further, the rate of transgression is conditioned by inherited topography with higher rates of retreat, and hence greater potential for drowning, expected across the shallowly dipping substrate. Using Hastings Bank as an example, it has also been demonstrated that the morphodynamic state of the barrier complex in terms of its ability to respond dynamically to relative sea-level rise, conditions its

  1. Youger Dryas and Heinrich events recorded by magnetic susceptibility of sediments from the central temperature area of Western Pacific Warm Pool

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    Three short geomagnetic excursions, the Go thenburg, Mono Lake and Mungo (or Maelifell) in the Brunhes Positive Polarity period, were revealed based on the studies of magnetostratigraphy, susceptibility (x) and δ18O of sediments in core WP 92-5 from the central temperature area of the Western Pacific Warm Pool (WPWP), and the ages of them are 12.1-11.3 kaBP, 25.0-24.0 kaBP, and 31.0-28.0 kaBP respectively. Furthermore, the Younger Dryas (YD) and Heinrich (H) cold events were also discov-ered in this core by the susceptibility record. The YD cold event occurred at the depth of 30-22 cm with an age of 11.5-10.6 kaBP; H1, H2 and H3 cold events occurred at depths of 51-39 cm, 108-91 cm and 140-126 cm with ages of 15.1-13.0 kaBP, 25.0-22.1 kaBP and 30.6-28.2 kaBP respectively, which well correspond to the H1, H2, H3 events recorded by susceptibility of core SU90-09 from middle At-lantic, indicating that the susceptibility change of marine sediments can be an important sign of climatic frequent fluc- tuations.

  2. The 100-133 ka record of Italian explosive volcanism and revised tephrochronology of Lago Grande di Monticchio

    Science.gov (United States)

    Wulf, Sabine; Keller, Jörg; Paterne, Martine; Mingram, Jens; Lauterbach, Stefan; Opitz, Stephan; Sottili, Gianluca; Giaccio, Biagio; Albert, Paul G.; Satow, Chris; Tomlinson, Emma L.; Viccaro, Marco; Brauer, Achim

    2012-12-01

    Laminated sediments of the maar lake Lago Grande di Monticchio in southern Italy exhibit a unique sequence of numerous primary tephra events that provide both insights into the Late Quaternary eruptive history of Italian volcanoes and an archive of essential marker horizons for dating and linking palaeoclimate records throughout the Central and Eastern Mediterranean. The acquisition of new sediment cores from this lake now extends the existing 100 ka-tephra record back to 133 ka BP, the end of the penultimate Glacial. The additional ca 30 m of sediments host a total number of 52 single tephra layers forming 21 tephra clusters that have been characterised on the basis of detailed geochemical and petrographical examinations. Tephras can be assigned to hitherto poorly known Plinian to sub-Plinian eruptive events of the nearby Campanian (Ischia Island, Phlegrean Fields), Roman (Sabatini volcanic district) and Aeolian-Sicilian volcanoes (Etna, Stromboli, Salina) and are dated according to the varve and sedimentation rate chronology of Monticchio sediments. The most prominent tephra layers within the interval of investigation - TM-25 and TM-27 - can be firmly correlated with Ionian Sea tephras X-5 (ca 105 ka BP) and X-6 (ca 108-110 ka BP). In addition, a further 26 tephra layers are correlated with radiometrically and radioisotopically dated volcanic events providing the basis for a robust revised tephrochronology of the entire Monticchio sediment sequence for the last 133 ka.

  3. Climate warming and vegetation response at the end of Heinrich event 1 (16 700–16 000 cal yr BP in Europe south of the Alps

    Directory of Open Access Journals (Sweden)

    S. Samartin

    2012-05-01

    Full Text Available Chironomids preserved in a sediment core from Lago di Origlio (416 m a.s.l., a lake in the foreland of the Southern Swiss Alps, allowed quantitative reconstruction of Late Glacial and early Holocene temperatures using a combined Swiss-Norwegian temperature inference model based on chironomid assemblages from 274 lakes. We reconstruct July air temperatures of ca. 10 °C between 17 300 and 16 000 cal yr BP, a rather abrupt warming to ca. 12.0 °C at ca. 16 500–16 000 cal yr BP, and a strong temperature increase at the transition to the Bølling/Allerød Interstadial with average temperatures of about 14 °C. During the Younger Dryas and earliest Holocene very similar temperatures are reconstructed as for the interstadial. The rather abrupt warming at 16 500–16 000 cal yr BP is consistent with sea-surface temperature as well as speleotherm records, which indicate a marked Pre-Bølling warming after the end of Heinrich event 1 in southern Europe and the Mediterranean Sea. The pollen record of Origlio and other sites from southern Switzerland and northern Italy indicate an early reforestation of the lowlands prior to the large-scale afforestation at the onset of the Bølling period at 14 700 cal yr BP in Central Europe. Our results suggest that these afforestation processes in the formerly glaciated areas of southern Switzerland and Northern Italy have been promoted by increasing temperatures.

  4. Climate warming and vegetation response after Heinrich event 1 (16 700–16 000 cal yr BP in Europe south of the Alps

    Directory of Open Access Journals (Sweden)

    W. Tinner

    2012-11-01

    Full Text Available Chironomids preserved in a sediment core from Lago di Origlio (416 m a.s.l., a lake in the foreland of the Southern Swiss Alps, allowed quantitative reconstruction of Late Glacial and Early Holocene summer temperatures using a combined Swiss–Norwegian temperature inference model based on chironomid assemblages from 274 lakes. We reconstruct July air temperatures of ca. 10 °C between 17 300 and 16 000 cal yr BP, a rather abrupt warming to ca. 12.0 °C at ca. 16 500–16 000 cal yr BP, and a strong temperature increase at the transition to the Bølling/Allerød interstadial with average temperatures of about 14 °C. During the Younger Dryas and earliest Holocene similar temperatures are reconstructed as for the interstadial. The rather abrupt warming at 16 500–16 000 cal yr BP is consistent with sea-surface temperature as well as speleothem records, which indicate a warming after the end of Heinrich event 1 (sensu stricto and before the Bølling/Allerød interstadial in southern Europe and the Mediterranean Sea. Pollen records from Origlio and other sites in southern Switzerland and northern Italy indicate an early reforestation of the lowlands 2000–1500 yr prior to the large-scale afforestation of Central Europe at the onset of the Bølling/Allerød period at ca. 14 700–14 600 cal yr BP. Our results suggest that these early afforestation processes in the formerly glaciated areas of northern Italy and southern Switzerland have been promoted by increasing temperatures.

  5. Pre-eruptive conditions of dacitic magma erupted during the 21.7 ka Plinian event at Nevado de Toluca volcano, Central Mexico

    Science.gov (United States)

    Arce, J. L.; Gardner, J. E.; Macías, J. L.

    2013-01-01

    The Nevado de Toluca volcano in Central Mexico has been active over the last ca. 42 ka, during which tens of km3 of pyroclastic material were erupted and two important Plinian-type eruptions occurred at ca. 21.7 ka (Lower Toluca Pumice: LTP) and ca. 10.5 ka (Upper Toluca Pumice: UTP). Samples from both the LTP and UTP contain plagioclase, amphibole, iron-titanium oxides, and minor anhedral biotite, set in a vesicular, rhyolitic, glassy matrix. In addition, UTP dacites contain orthopyroxene. Analysis of melt inclusions in plagioclase phenocrysts yields H2O contents of 2-3.5 wt.% for LTP and 1.3-3.6 wt.% for UTP samples. Ilmenite-ulvospinel geothermometry yields an average temperature of ~ 868 °C for the LTP magma (hotter than the UTP magma, ~ 842 °C; Arce et al., 2006), whereas amphibole-plagioclase geothermometry yields a temperature of 825-859 °C for the LTP magma. Water-saturated experiments using LTP dacite suggest that: (i) amphibole is stable above 100 MPa and below 900 °C; (ii) plagioclase crystallizes below 250-100 MPa at temperatures of 850-900 °C; and (iii) pyroxene is stable only below pressures of 200-100 MPa and temperatures of 825-900 °C. Comparison of natural and experimental data suggests that the LTP dacitic magma was stored at 150-200 MPa (5.8-7.7 km below the volcano summit). No differences in pressure found between 21.7 ka and 10.5 ka suggest that these two magmas were stored at similar depths. Orthopyroxene produced in lower temperature LTP experiments is compositionally different to those found in UTP natural samples, suggesting that they originated in two different magma batches. Whole-rock chemistry, petrographic features, and mineral compositions suggest that magma mixing was responsible for the generation of the dacitic Plinian LTP eruption.

  6. Geochemical properties and environmental impacts of seven Campanian tephra layers deposited between 40 and 38 ka BP in the varved lake sediments of Lago Grande di Monticchio, southern Italy

    Science.gov (United States)

    Wutke, Kristina; Wulf, Sabine; Tomlinson, Emma L.; Hardiman, Mark; Dulski, Peter; Luterbacher, Jürg; Brauer, Achim

    2015-06-01

    We present the results of new tephrostratigraphical and environmental impact studies of the 40-38 ka varved sediment section of Lago Grande di Monticchio (southern Italy). The sediments in this time zone are correlated with the Heinrich H4-stadial that occurred between Greenland Interstadials GI-9 and GI-8, and include the widespread Campanian Ignimbrite (CI, 39.3 ka) as a thick tephra layer in the middle of the H4 stadial. The CI in the Monticchio record is overlain by the Schiava tephra from Vesuvius, c. 1240 varve-years younger than the CI, and preceded by four tephras from small-scale eruptions of the Phlegrean Fields and by an Ischia-derived tephra. The four Phlegrean Field-derived tephras were deposited 600 varve-years or fewer prior to the deposition of the CI and show very similar major, minor, and trace element glass compositions to those of the CI. This close similarity in composition and age could compromise the accurate linking and synchronisation of palaeoenvironmental records in the central Mediterranean area. Microfacies analyses and μ-XRF core scanning were used to characterise primary and secondary depositional features of all seven tephra layers and to evaluate environmental and ecological responses after tephra deposition. Higher concentrations of tephra-derived material (mainly glass shards and pumices) in primary and reworked layers were detected by elevated K-counts in μ-XRF elemental core scans. Reworked tephra derives mainly from in-washing from the littoral zone and the catchment and occurs within five to 30 years, and up to 1240 varve years, after the deposition of thinner (1-5 mm) and thicker (5-230 mm) tephra fallout deposits, respectively. An obvious response of diatom population growth directly after the primary tephra deposition was observed for the thicker tephra layers (>1 mm) during the first 1-8 years after deposition of the primary deposit indicating that the additional input of potential nutrients (glass shards) temporarily

  7. Younger Dryas Event and Cold Events in Early-Mid Holocene: Record from the sediment of Erhai Lake%新仙女木事件及全新世早中期降温事件——来自洱海湖泊沉积的记录

    Institute of Scientific and Technical Information of China (English)

    周静; 王苏民; 杨桂山

    2007-01-01

    Three cold events (the Younger Dryas, 9.4 ka cal BP, 5.8 ka cal BP) since the 13 ka cal BP in Erhai (EH) Lake catchment, Yunnan Province, were analyzed using the Total Organic Carbon (TOC) series of the EH core. By comparison of the EH core, Qinghai Lake core and Guliya ice core, differences of these cold events were determined. Erhai Lake's responses to the global cold events were lagged in time and weakened in intensity in comparison with Qinghai Lake's. The latitude location of Erhai Lake and the obstruction of Tibetan Plateau may in part explain the differences. However, the remarkable cold event of 8.2 ka cal BP in the Guliya ice core was absent in the records of Erhai Lake and Qinghai Lake. Power spectrum analysis of the TOC proxy series shows that there were three kinds of millennial cycles, i.e. 5 ka, 2.3 ka, and 1.5 ka, in climate changes in Erhai Lake, which reveal the responses of climate to suborbit cycles.

  8. Kuulus dress ka Evelinile!

    Index Scriptorium Estoniae

    2009-01-01

    Proua Evelin Ilves kinkis Eestis esinenud popstaar Madonnale eesti rahvusmotiividega dressid. Sarnased spordirõivad tulevad müügile ka Tallinnas Viru keskuses Bastioni esinduskaupluses. Proua Evelin Ilvesele valmistatakse ainulaadsed valgest kangast dressid

  9. Kuulus dress ka Evelinile!

    Index Scriptorium Estoniae

    2009-01-01

    Proua Evelin Ilves kinkis Eestis esinenud popstaar Madonnale eesti rahvusmotiividega dressid. Sarnased spordirõivad tulevad müügile ka Tallinnas Viru keskuses Bastioni esinduskaupluses. Proua Evelin Ilvesele valmistatakse ainulaadsed valgest kangast dressid

  10. Seasonal hypoxia was a natural feature of the coastal zone in the Little Belt, Denmark, during the past 8 ka

    NARCIS (Netherlands)

    van Helmond, N.A.G.M.; Krupinski, Nadine Quintana; Lougheed, Bryan; Obrochta, Stephen; Andrén, Thomas; Slomp, C.P.

    2017-01-01

    The extent of the hypoxic area in the Baltic Sea has rapidly expanded over the past century. Two previous phases of widespread hypoxia, coinciding with the Holocene Thermal Maximum (HTM; 8–4 ka before present; BP) and the Medieval Climate Anomaly (MCA; 2–0.8 ka BP), have been identified. Relatively

  11. 中全新世云南寻甸地区气候演化与冷干事件的石笋记录%Stalagmite Records of Climate Change and Cold-Dry Events During the Middle Holocene in Xundian, Yunnan

    Institute of Scientific and Technical Information of China (English)

    张会领; 蒲晓强

    2011-01-01

    通过对云南寻甸XR1石笋进行TIMS-U系测年、氧碳同位素和沉积速率变化分析,重建了寻甸地区中全新世季风气候演化模式:(1)8.0~6.0 ka BP为温暖湿润期;(2)6.0~5.1 ka BP为气候突变期,温湿向冷干转变;(3)5.1~2.1 ka BP为气候恢复期,气候从冷干逐渐恢复到中全新世正常的气候水平.XR1石笋还揭示了该地区中全新世出现的四次冷干气候事件:6.0~5.1 ka BP冷干事件相当于考古学上的仰韶中期的寒冷期,被Denton称为第二次小冰期;4.7~4.5 ka BP气候事件是气候回暖过程中一次短暂的变冷事件;3.1~2.5kaBP间的降温事件在中国历史文献中被称为西周寒冷期,相当于北半球新冰期中的第三次新冰期.2.5~2.1ka BP降温阶段相当于我国近5000年气候变化的第二次冷期.%Based on age-dating of TIMS-U series and analyzing carbon and oxygen isotopes and deposition velocity on XR1 stalagmite from Xianren cave in Xundian, Yunnan, the authors revealed the monsoon climate change pattern during the middle Holocene in Xundian. The climate change in Xundian can be divided into three periods approximately: (1) 8.0 ~ 6.0kaBP was a warm and wet period; (2) 6.0~5.1ka BP was a climate change period, with climate changing from wet and warm to cold and dry; (3) 5.1~2.1kaBP was a climate recovering period, during which the climate changed from cold and dry to the average climate level of the Middle Holocene.The authors also detected four clod and dry climate events during the Middle Holocene in Xundian, which perfectly responded to the global change. The first climate event that lasted from 6.0 ka BP to 5.1ka BP corresponded to the cold period during the Middle Yangshao age in archaeology, and is also called the second little ice age by Denton. The second climate event whose age span was from 4.7kaBPto 4.5kaBP was a short cooling event during the climate recovering period. The third cooling event that lasted from 3.1kaBP to 2

  12. A biomass burning record from the Lingtai Loess Section during the last 370 ka and implication for climate and environment

    Institute of Scientific and Technical Information of China (English)

    ZHOU Bin; SHEN Chengde; SUN Yanmin; YANG Ying; YI Weixi

    2006-01-01

    The history of natural fire and its relationship with climate and vegetation are revealed from the content of elemental carbon and associated pollen data and paleoclimatic substitutive indicators for the loess of Lingtai Section in the last 370 ka BP. The study indicates that intense episodes of vegetation fires occurred during the interim especially when the climate was changing from wet to drought. The average content of elemental carbon in the interglaciers is higher than that in the glaciers, which coincides with the biomass change locally (or globally). The content of elemental carbon increases in the stage around 130 ka BP, indicating that the vegetation and climate pattern have changed, which may contribute to the variation of CO2. As a whole, the content of elemental carbon increasing with the time reflects the increasing aridity trend to some degree. In addition, the occurrence of the maximum peak and the highest average content of elemental carbon in the Holocene reflects the occurrence of a rapid climate event in 5900 a BP and more frequent fires caused by anthropic activities.

  13. A deadly cocktail: How a drought around 4200 cal. yr BP caused mass mortality events at the infamous ‘dodo swamp’in Mauritius

    NARCIS (Netherlands)

    de Boer, E.J.; Vélez, M.I.; Rijsdijk, K.F.; de Louw, P.G.B.; Vernimmen, T.J.J.; Visser, P.M.; Tjallingii, R.; Hooghiemstra, H.

    2015-01-01

    Analyses of pollen, diatoms, XRF geochemistry, and pigments provide a unique window into how an insular ecosystem in Mauritius responded to an extreme drought event 4200 years ago. We provide a reconstruction of regional vegetation change and local wetland development under influence of sea level ri

  14. A 16 ka climate record deduced from δ13C and C/N ratio in Qinghai Lake sediments, northeastern Tibetan Plateau

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    On the basis of multi-proxy analysis on TOC, TN, C/N, organic δ13C and grain size, sediment record from Qinghai Lake provides evidences of stepwise-patterned climatic change since 16 ka BP.Results show that Qinghai Lake underwent six environmental stages. From 16.2 to 14.3 ka BP and from 4.0 to 2.1 ka BP, the organic δ13C value was controlled by the concentration of atmospheric CO2. Relative higher organic δ13C values occurred between 14.3 to 10.4 ka BP indicative of water hardness decrease resulted from melting ice water, corresponding to two intervals of C/N peak values to the Bo1ing and Allerod warm periods in Europe respectively. From 10.4 ka BP, Qinghai Lake entered the Holocene and the climate was warm and a little dry. The Megathermal appeared at about 6.7 ka BP when the vegetation around the lake transformed into a forest. Between 6.3 ka BP and 4.0 ka BP, the temperature decreased and δ13C value was controlled by the expansion of C3 plants and the retreat of C4 plants in river catchment.Since 4.0 ka BP, the climate gradually became cold and dry. From 2.1 ka BP, the cold-dry climate and human activity resulted in an abrupt increase in C/N with deceased δ13C value; meanwhile, many coarse grains appeared in sediments.

  15. Events

    Directory of Open Access Journals (Sweden)

    Igor V. Karyakin

    2016-02-01

    Full Text Available The 9th ARRCN Symposium 2015 was held during 21st–25th October 2015 at the Novotel Hotel, Chumphon, Thailand, one of the most favored travel destinations in Asia. The 10th ARRCN Symposium 2017 will be held during October 2017 in the Davao, Philippines. International Symposium on the Montagu's Harrier (Circus pygargus «The Montagu's Harrier in Europe. Status. Threats. Protection», organized by the environmental organization «Landesbund für Vogelschutz in Bayern e.V.» (LBV was held on November 20-22, 2015 in Germany. The location of this event was the city of Wurzburg in Bavaria.

  16. Carbonate and carbon fluctuations in the Eastern Arabian Sea over 140 ka: Implications on productivity changes?

    Digital Repository Service at National Institute of Oceanography (India)

    Guptha, M.V.S.; Naidu, P.D.; Haake, B.G.; Schiebel, R.

    orientation. ARTICLE IN PRESS Table1 Core depth, age, stable oxygen isotope data, linear sedimenta- tion rate (LSR), and calcite and organic carbon concentration ofsedimentcoreSL-1 Depth (cm) Age (kaBP) d 18 O (%) LSR (cm/ka) CaCO 3 (%) C org (%) 1 0.49 47....96 0.50 225 44.00 30.85 0.38 230 45.00 C00.49 5.02 33.34 0.49 235 45.99 32.38 0.73 240 46.99 C00.24 5.02 38.10 0.56 Table1(continued) Depth (cm) Age (kaBP) d 18 O (%) LSR (cm/ka) CaCO 3 (%) C org (%) 245 47.98 45.24 0.48 250 48.98 C00.50 5.02 45.10 0...

  17. Latest Quaternary palaeoceanographic change in the eastern North Atlantic based upon a dinoflagellate cyst event ecostratigraphy

    Directory of Open Access Journals (Sweden)

    Rex Harland

    2016-05-01

    Full Text Available The analyses of dinoflagellate cyst records, from the latest Quaternary sediments recovered from DSDP Core 610A taken on the Feni Ridge in the southern Rockall Trough, and part of core MD01-2461 on the continental margin of the Porcupine Seabight in the eastern North Atlantic Ocean, has provided evidence for significant oceanographic change encompassing the Last Glacial Maximum (LGM and part of the Holocene. This together with other published records has led to a regional evaluation of oceanographic change in the eastern North Atlantic over the past 68 ka, based upon a distinctive dinoflagellate event ecostratigraphy. These changes reflect changes in the surface waters of the North Atlantic Current (NAC, and perhaps the deeper thermohaline Atlantic Meridional Overturning Circulation (AMOC, driving fundamental regime changes within the phytoplanktonic communities. Three distinctive dinoflagellate cyst associations based upon both factor and cluster analyses have been recognised. Associations characterised by Bitectatodinium tepikiense (between 61.1 ± 6.2 to 13.4 ± 1.1 ka BP, Nematosphaeropsis labyrinthus (between 10.5 ± 0.3 and 11.45 ± 0.8 ka. BP, and the cyst of Protoceratium reticulatum (between 8.5 ± 0.9 and 5.2 ± 1.3 ka. BP indicate major change within the eastern North Atlantic oceanography. The transitions between these changes occur over a relatively short time span (c.1.5 ka, given our sampling resolution, and have the potential to be incorporated into an event stratigraphy through the latest Quaternary as recommended by the INTIMATE (INTegrating Ice core, MArine and TErrestrial records group. The inclusion of a dinoflagellate cyst event stratigraphy would highlight changes within the phytoplankton of the North Atlantic Ocean as a fully glacial world changed to our present interglacial.

  18. Latest Quaternary palaeoceanographic change in the eastern North Atlantic based upon a dinoflagellate cyst event ecostratigraphy.

    Science.gov (United States)

    Harland, Rex; Polovodova Asteman, Irina; Morley, Audrey; Morris, Angela; Harris, Anthony; Howe, John A

    2016-05-01

    The analyses of dinoflagellate cyst records, from the latest Quaternary sediments recovered from DSDP Core 610A taken on the Feni Ridge in the southern Rockall Trough, and part of core MD01-2461 on the continental margin of the Porcupine Seabight in the eastern North Atlantic Ocean, has provided evidence for significant oceanographic change encompassing the Last Glacial Maximum (LGM) and part of the Holocene. This together with other published records has led to a regional evaluation of oceanographic change in the eastern North Atlantic over the past 68 ka, based upon a distinctive dinoflagellate event ecostratigraphy. These changes reflect changes in the surface waters of the North Atlantic Current (NAC), and perhaps the deeper thermohaline Atlantic Meridional Overturning Circulation (AMOC), driving fundamental regime changes within the phytoplanktonic communities. Three distinctive dinoflagellate cyst associations based upon both factor and cluster analyses have been recognised. Associations characterised by Bitectatodinium tepikiense (between 61.1 ± 6.2 to 13.4 ± 1.1 ka BP), Nematosphaeropsis labyrinthus (between 10.5 ± 0.3 and 11.45 ± 0.8 ka. BP), and the cyst of Protoceratium reticulatum (between 8.5 ± 0.9 and 5.2 ± 1.3 ka. BP) indicate major change within the eastern North Atlantic oceanography. The transitions between these changes occur over a relatively short time span (c.1.5 ka), given our sampling resolution, and have the potential to be incorporated into an event stratigraphy through the latest Quaternary as recommended by the INTIMATE (INTegrating Ice core, MArine and TErrestrial records) group. The inclusion of a dinoflagellate cyst event stratigraphy would highlight changes within the phytoplankton of the North Atlantic Ocean as a fully glacial world changed to our present interglacial.

  19. Molecular Paleoclimate Reconstructions over the Last 9 ka from a Peat Sequence in South China.

    Science.gov (United States)

    Wang, Xinxin; Huang, Xianyu; Sachse, Dirk; Ding, Weihua; Xue, Jiantao

    2016-01-01

    To achieve a better understanding of Holocene climate change in the monsoon regions of China, we investigated the molecular distributions and carbon and hydrogen isotope compositions (δ13C and δD values) of long-chain n-alkanes in a peat core from the Shiwangutian (SWGT) peatland, south China over the last 9 ka. By comparisons with other climate records, we found that the δ13C values of the long-chain n-alkanes can be a proxy for humidity, while the δD values of the long-chain n-alkanes primarily recorded the moisture source δD signal during 9-1.8 ka BP and responded to the dry climate during 1.8-0.3 ka BP. Together with the average chain length (ACL) and the carbon preference index (CPI) data, the climate evolution over last 9 ka in the SWGT peatland can be divided into three stages. During the first stage (9-5 ka BP), the δ13C values were depleted and CPI and Paq values were low, while ACL values were high. They reveal a period of warm and wet climate, which is regarded as the Holocene optimum. The second stage (5-1.8 ka BP) witnessed a shift to relatively cool and dry climate, as indicated by the more positive δ13C values and lower ACL values. During the third stage (1.8-0.3 ka BP), the δ13C, δD, CPI and Paq values showed marked increase and ACL values varied greatly, implying an abrupt change to cold and dry conditions. This climate pattern corresponds to the broad decline in Asian monsoon intensity through the latter part of the Holocene. Our results do not support a later Holocene optimum in south China as suggested by previous studies.

  20. Study on the Characters of the Geochemical Elements and Changes of Paleoclimate since about 4 000 a B.P. in Niya Section%南疆尼雅地区4 000 a来的地化元素分布特征 与古气候环境演化的初步研究

    Institute of Scientific and Technical Information of China (English)

    舒强; 钟巍; 熊黑钢; 塔西甫拉提; 高村宏毅

    2001-01-01

    value appeared, consistent with the second high temperature event of Dunde ice core(3.0~2.9 ka B.P.) in Holocene.   (2) 3.0~2.2 ka B.P., relative cold-moisture in climate. Around 2.7 ka B.P., a short dry period in climate appeared, consistent with the cold-moisture period(3.0~2.0 ka B.P.) in Boston Lake area basically, also consistent with the third Neo-glacial epoch in north hemisphere and relative cold-moisture in climate (2.5 ka B.P.) in south Zhili.   (3) 2.2~1.6 ka B.P., relative warm-dry period in climate. During the period, it was getting drier in climate obviously. Large scale drought lasting for several years appeared in south and east Xinjiang. Jinjue (relics of Niya) and Yumi, which were small countries in the west region in West-Han Dynasty, disappeared in desert, and the Silk Road moved toward south, according to the apparent warm-dry period in Boston Lake of Tarim Basin, also according to the fifth severe cold period in east China and sub-Atlantic period in climate in south Zhili.   (4) 1.6~1.0 ka B.P., it grew colder and went into cold-moisture period. A warm-dry change appeared at about 1.2 ka B.P., according to the warm period appearing around 7 century found in Guliya ice core.   (5) 1.0 ka B.P. to present. There was a warm-dry trend again in 1.0 ka B.P., consistent with the record of Guliya ice core. After that, for about 1 000 years, warm-dry appeared in climate on the whole.

  1. ATLAS distributed computing operations in the GridKa cloud

    Energy Technology Data Exchange (ETDEWEB)

    Duckeck, Guenter; Serfon, Cedric; Walker, Rodney [Ludwig-Maximilians-Universitaet, Garching (Germany); Harenberg, Torsten; Kalinin, Sergey; Schultes, Joachim [Bergische Universitaet, Wuppertal (Germany); Kawamura, Gen [Johannes-Gutenberg-Universitaet, Mainz (Germany); Leffhalm, Kai [DESY, Zeuthen (Germany); Meyer, Joerg [Georg-August-Universitaet, Goettingen (Germany); Petzold, Andreas [Karlsruher Institut fuer Technologie (Germany); Sundermann, Jan Erik [Albert-Ludwigs-Universitaet, Freiburg (Germany)

    2011-07-01

    The ATLAS Grid Computing resources in Germany, Poland, the Czech Republic, Austria, and Switzerland consist of a cloud of 12 Tier-2 computing centers grouped around the Tier-1 center GridKa at the Steinbuch Centre for Computing at KIT. While the Tier-1 center serves as a hub for data management in the cloud and is the principal resource for reprocessing and custodial storage of raw ATLAS data, the Tier-2 centers provide the resources for user analysis and production of simulated events. During the first full year of data taking at the LHC, the GridKa cloud has successfully contributed to the overall ATLAS computing effort, enabling physicists to quickly analyze the large volume of new incoming data and the corresponding simulated events. This talk covers the computing operations in the GridKa cloud with focus on performance and experiences at both the Tier-1 and Tier-2 centers.

  2. Ostracod assemblages and their environmental significance from the lake core of the Nam Co on the Tibetan Plateau 8.4 kaBP%8.4 ka以来纳木错湖芯介形类组合的环境变化意义

    Institute of Scientific and Technical Information of China (English)

    谢曼平; 朱立平; 彭萍; 王君波; 汪勇; SCHWALB Antje

    2009-01-01

    A 332-cm long lacustrine core was drilled in the Nam Co in the central-southern part of the Tibetan Plateau. From the core, 15 species of ostracods (Crustacea: Ostracoda), which belong to 6 genera have been identified. According to the variations of the ostracod assem-blages and the ostracods ecological features, which are sensitive to the changing environ-ment, three main stages can be distinguished as follows: Stage I was from 8400 to 6800 a BP, during which the climate was cold-humid, and the lake depth changed from shallow to deep. Stage II was from 6400 to 2500 a BP, during which the climate changed from warm-humid to cold-humid, and then to cold-dry. The lake depth gradually became deep. The shifting of cli-mate, from wet-cold to dry-cold during this period, had constructed the basis of present en-vironment in the Nam Co. Stage III was from 2500 a BP to the present, which showed a trait of lake depth increasing. At the earlier period of this stage, the climate kept as cold-dry as that in the former stage, but the salinity of the lake increased. At the later period of this stage, the degree of cold-dry was enhanced, and the activities of land surface runoff tended to be weakened. Our research also found that the peak values of ostracods with black shell was coherent with the maximum production of the ostracods, and agreed with the increasing sedimentary water dynamics. This indicated that the ostracods with black shell was simulta-neous with the high prolificacy of ostracod, and transported from other places. The abun-dance of Candona juvenile shells reflected the high mortality of that kind of ostracods under an unfavorable condition. This was probably a result of the rapid change of water dynamics of sedimentary environment.

  3. A broad deglacial δ13C minimum event in planktonic foraminiferal records in the Okinawa Trough

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    The equatorial Pacific upwelling zone has been suspected of playing an important role in the global atmospheric CO2 changes associated with glacial-interglacial cycles.In order to assess the influencing scope of the surface water deglacial δ13C minimum in the tropical Iow-latitude Pacific,the core DGKS9603, collected from the middle Okinawa Trough, was examined for δ13C records of planktonic foraminifera N. dutertrei and G. ruber. The planktonic foraminiferal δ13C records show a clear decreasing event from 20 to 6 cal. kaBP., which is characterized by long duration of about 14 ka and amplitude shift of 0.4 × 10-3. Its minimum value occurred at 15.7 cai kaBP. The event shows fairly synchrony with the surface water deglacial δ13C minimum identiffed in the tropical Pacific and its marginal seas. Because there is no evidence in planktonic foraminiferal fauna and δ18O records for upwelling and river runoff enhancement,the broad deglacial δ13C minimum event in planktonic foraminiferal records revealed in core DGKS9603 might have been the direct influencing result of the deglacial surface water of the tropical Pacific. The identification for the event in the Okinawa Trough provides new evidence that the water evolution in the tropical low-latitude Pacific plays a key role in large regional, even global carbon cycle.

  4. Insights from a synthesis of old and new climate-proxy data from the Pyramid and Winnemucca lake basins for the period 48 to 11.5 cal ka

    Science.gov (United States)

    Benson, Larry; Smoot, J.P.; Lund, S.P.; Mensing, S.A.; Foit, F.F.; Rye, R.O.

    2013-01-01

    A synthesis of old and new paleoclimatic data from the Pyramid and Winnemucca lake basins indicates that, between 48.0 and 11.5·103 calibrated years BP (hereafter ka), the climate of the western Great Basin was, to a degree, linked with the climate of the North Atlantic. Paleomagnetic secular variation (PSV) records from Pyramid Lake core PLC08-1 were tied to the GISP2 ice-core record via PSV matches to North Atlantic sediment cores whose isotopic and(or) carbonate records could be linked to the GISP2 δ18O record. Relatively dry intervals in the western Great Basin were associated with cold Heinrich events and relatively wet intervals were associated with warm Dansgaard-Oeschger (DO) oscillations. The association of western Great Basin dry events with North Atlantic cold events (and vice versa) switched sometime after the Laurentide Ice Sheet (LIS) reached its maximum extent. For example, the Lahontan highstand, which culminated at 15.5 ka, and a period of elevated lake level between 13.1 and 11.7 ka were associated with cold North Atlantic conditions, the latter period with the Youngest Dryas event. Relatively dry periods were associated with the Bølling and Allerød warm events. A large percentage of the LIS may have been lost to the North Atlantic during Heinrich events 1 and 2 and may have resulted in the repositioning of the Polar Jet Stream over North America. The Trego Hot Springs, Wono, Carson Sink, and Marble Bluff tephras found in core PLC08-1 have been assigned GISP2 calendar ages of respectively, 29.9, 33.7, 34.1, and 43.2 ka. Given its unique trace-element chemistry, the Carson Sink Bed is the same as Wilson Creek Ash 15 in the Mono Lake Basin. This implies that the Mono Lake magnetic excursion occurred at approximately 34 ka and it is not the Laschamp magnetic excursion. The entrance of the First Americans into the northern Great Basin is dated to approximately 14.4 ka, a time when the climate was relatively dry. Evidence for human occupation of

  5. Prunskiene tahab lepet ka Keskerakonnaga

    Index Scriptorium Estoniae

    2011-01-01

    Leedu Rahvaerakonna (LLP) juht Kazimira Prunskeine käis Moskvas Ühtse Venemaa kongressil ning allkirjastas leppe oma erakonna ja Ühtse Venemaa vahel, samasuguse leppe kavatseb ta allkirjastada ka Eesti Keskerakonnaga, Kasahstanis võimul oleva Nur Otani partei ja Kreeka erakonnaga Uus Demokraatia

  6. Ajateenistust alustab ka viis neidu

    Index Scriptorium Estoniae

    2013-01-01

    Tuleval nädalal alustab ajateenistust üle 1600 noormehe, lisaks alustab juulis Kuperjanovi jala­väepataljonis vabatahtlikuna ajateenistust ka viis neidu. Juulikuise teenistusse kutsumisega alustavad teenistust ajateenijad, kelle ametikoht eeldab 11-kuulist ajateenistust ehk autojuhid, erialaspet­sialistid, allohvitserid ja reservrühmaülemad

  7. Late Quaternary Glaciations in the Central Peruvian Andes (10°-11°S) and Evidence for a Link to Heinrich Events

    Science.gov (United States)

    Smith, J. A.; Farber, D. L.; Finkel, R. C.; Rodbell, D. T.; Seltzer, G. O.

    2009-05-01

    Seven cosmogenic 10Be ages from a moraine in the Santuario Nacional Bosque de Piedras de Huayllay (BP) in the Western Cordillera of the central Peruvian Andes (10°59'S, 76°20'W, 4180-4200 masl) are consistent with 10Be ages on moraines in both the Eastern Cordillera (40-45 km to the east) and Nevado Jeulla Rajo (NJR) massif (10°00'S, 77°16'W) at the southern end of the Cordillera Blanca (150 km to the northwest). In the BP, 10Be ages are ~14-15 ka on four ignimbrite boulders, ~26 and ~20 ka on two quartz boulders, and ~45 ka on ignimbrite bedrock below the trimline in the valley wall. In the Eastern Cordillera bordering Lake Junin, the most extensive glaciations are >150 ka, but end moraines farther upvalley date to the local last glacial maximum (LLGM; 25-30 ka) and a late-glacial stillstand or readvance (14-18 ka). In NJR, 10Be ages indicate that the largest lateral moraines were deposited during similar intervals (27-32 ka and 14-18 ka). Avulsion of a glacial valley preserved an older, smaller pair of lateral moraines (56-65 ka) in NJR; correlative moraines were apparently not preserved in the Junin valleys. We have found no moraines in NJR that date to the global LGM (ca. 19-24 ka), but see some evidence for an advance ca. 40-48 ka. Outwash deposits (ca. 43-50 ka) located beyond the termini of NJR moraines are underlain by lodgement till that extends ca. 6 km across the Conococha Plain, suggesting that at least one older glaciation was far more extensive than any of the late Quaternary NJR advances dated by 10Be (ages calculated using CRONUS-Earth Online Calculator v. 2.2, Lal/Stone time-dependent scaling, and zero erosion). The timing of glacial advances in the central Peruvian Andes since 70 ka suggests a correlation to Heinrich events and associated southward shifts of the Intertropical Convergence Zone (ITCZ) in the Atlantic Ocean. We propose that Peruvian glaciers typically expanded when southward migration of the ITCZ resulted in increased

  8. Long-term trend and abrupt events of the Holocene Asian monsoon inferred from a stalagmite δ18O record from Shennongjia in Central China

    Institute of Scientific and Technical Information of China (English)

    SHAO Xiaohua; WANG Yongjin; CHENG Hai; KONG Xinggong; WU Jiangying; EDWARDS R. Lawrence

    2006-01-01

    A high-resolution oxygen-isotope record from a thorium-uranium-dated stalagmite from Shanbao Cave at Shennongjia reflects variations in the amount of monsoon precipitation for the period from 11.5 to 2.1 ka (1 ka = 1000 cal aBP). Between 11.5 and 9.3 ka, a sharp decrease in δ18O indicates a rapid increase in monsoon precipitation. An interval of generally high monsoon precipitation is observed between 9.3 and 4.4 ka. An arid period has prevailed between 4.4 and 2.1 ka. The long-term trend of Shanbao record appears to follow summer insolation at 33°N latitude. An abrupt decrease in monsoon precipitation around 4.3 ka is synchronous with the collapse of Neolithic culture in central China. This abrupt change could have resulted from the amplification of the gradually decreased summer insolation by the positive vegetation-atmosphere-aerosol feedback. The weakened Asian monsoon events were in concert with decreased Greenland temperature during the early Holocene, centered at 8.2, 8.6, 9.3, 10.2 and 11.0 ka. This correlation suggests that changes in low-latitude monsoon are connected with climate change in high-latitude polar region.

  9. The rise and fall of Lake Bonneville between 45 and 10.5 ka

    Science.gov (United States)

    Benson, L.V.; Lund, S.P.; Smoot, J.P.; Rhode, D.E.; Spencer, R.J.; Verosub, K.L.; Louderback, L.A.; Johnson, C.A.; Rye, R.O.; Negrini, R.M.

    2011-01-01

    A sediment core taken from the western edge of the Bonneville Basin has provided high-resolution proxy records of relative lake-size change for the period 45.1-10.5 calendar ka (hereafter ka). Age control was provided by a paleomagnetic secular variation (PSV)-based age model for Blue Lake core BL04-4. Continuous records of ??18O and total inorganic carbon (TIC) generally match an earlier lake-level envelope based on outcrops and geomorphic features, but with differences in the timing of some hydrologic events/states. The Stansbury Oscillation was found to consist of two oscillations centered on 25 and 24 ka. Lake Bonneville appears to have reached its geomorphic highstand and began spilling at 18.5 ka. The fall from the highstand to the Provo level occurred at 17.0 ka and the lake intermittently overflowed at the Provo level until 15.2 ka, at which time the lake fell again, bottoming out at ~14.7 ka. The lake also fell briefly below the Provo level at ~15.9 ka. Carbonate and ??18O data indicate that between 14.7 and 13.1 ka the lake slowly rose to the Gilbert shoreline and remained at about that elevation until 11.6 ka, when it fell again. Chemical and sedimentological data indicate that a marsh formed in the Blue Lake area at 10.5 ka.Relatively dry periods in the BL04-4 records are associated with Heinrich events H1-H4, suggesting that either the warming that closely followed a Heinrich event increased the evaporation rate in the Bonneville Basin and (or) that the core of the polar jet stream (PJS) shifted north of the Bonneville Basin in response to massive losses of ice from the Laurentide Ice Sheet (LIS) during the Heinrich event. The second Stansbury Oscillation occurred during Heinrich event H2, and the Gilbert wet event occurred during the Younger Dryas cold interval. Several relatively wet events in BL04-4 occur during Dansgaard-Oeschger (DO) warm events.The growth of the Bear River glacier between 32 and 17 ka paralleled changes in the values of proxy

  10. A ˜25 ka Indian Ocean monsoon variability record from the Andaman Sea

    Science.gov (United States)

    Rashid, H.; Flower, B. P.; Poore, R. Z.; Quinn, T. M.

    2007-10-01

    Recent paleoclimatic work on terrestrial and marine deposits from Asia and the Indian Ocean has indicated abrupt changes in the strength of the Asian monsoon during the last deglaciation. Comparison of marine paleoclimate records that track salinity changes from Asian rivers can help evaluate the coherence of the Indian Ocean monsoon (IOM) with the larger Asian monsoon. Here we present paired Mg/Ca and δ 18O data on the planktic foraminifer Globigerinoides ruber (white) from Andaman Sea core RC12-344 that provide records of sea-surface temperature (SST) and δ 18O of seawater (δ 18O sw) over the past 25,000 years (ka) before present (BP). Age control is based on nine accelerator mass spectrometry (AMS) dates on mixed planktic foraminifera. Mg/Ca-SST data indicate that SST was ˜3 °C cooler during the last glacial maximum (LGM) than the late Holocene. Andaman Sea δ 18O sw exhibited higher than present values during the Lateglacial interval ca 19-15 ka BP and briefly during the Younger Dryas ca 12 ka BP. Lower than present δ 18O sw values during the BØlling/AllerØd ca 14.5-12.6 ka BP and during the early Holocene ca 10.8-5.5 ka BP are interpreted to indicate lower salinity, reflect some combination of decreased evaporation-precipitation (E-P) over the Andaman Sea and increased Irrawaddy River outflow. Our results are consistent with the suggestion that IOM intensity was stronger than present during the BØlling/AllerØd and early Holocene, and weaker during the late glaciation, Younger Dryas, and the late Holocene. These findings support the hypothesis that rapid climate change during the last deglaciation and Holocene included substantial hydrologic changes in the IOM system that were coherent with the larger Asian monsoon.

  11. Planktonic Foraminifera as Sensitive Recorders of Climate Variability in the Eastern Mediterranean During the Last ~90 ka

    Science.gov (United States)

    Almogi-Labin, A.; Bar-Matthews, M.; Ayalon, A.; Paterne, M.

    2014-12-01

    Planktonic foraminifera (PF) are widely used in Quaternary paleoceanography as carriers of oxygen stable isotope signal. This signal is one of the main tools for establishing chronostratigraphy and determining the nature of global and local glacial and interglacial cycles. In this study, the focus is on the PF assemblages which are sensitive recorders of climate and water column properties including the degree of water column stratification and trophic levels. In order to reconstruct the climate variability of the last ~90 ka, core MDVAL9501 (980 m water depth), taken by R/V Marion Dufresnae, SE of Cyprus, was studied. A δ18O-Globigerinoides ruber stratigraphy was established and correlated with well-dated (U/Th) speleothem records of Soreq Cave and radiocarbon dates. The sedimentary record in this core covers the last ~90ka. Variations in PF assemblage composition indicate that conditions shifted between two main climatic scenarios. During the last glacial cooler, more aerated, less stratified and more mesotrophic water column persisted with distinct seasonality. This is evident from the occurrence of two deep water dwellers Globorotalia inflata being abundant from 75 to 50 ka BP and G. scitula from 55 to 15 ka BP (with respective SST of 15-16 ºC and 11-13 ºC) and accompanied continuously by the cold water species Neogloboqudrina pachyderma and Globigerina bulloides. Among the "warm" water species G. ruber is nearly the only "survivor" during the glacial period comprising 25-50% of the assemblage with lower values corresponding to minima in D-O events. During Holocene, water column was warmer, more stratified, mostly oligotrophic with reduced seasonality. The dominating species were G. ruber and other "warm" water species comprising >75% of the assemblage and occurring in low numbers. An exception are sapropel S1 (early Holocene) and S3 (MIS 5.1) periods, when lower δ18O and highest TOC values prevail with significantly increased numerical abundance of PF

  12. Was the 12.1 ka Icelandic Vedde Ash one of a kind?

    Science.gov (United States)

    Lane, C. S.; Blockley, S. P. E.; Mangerud, J.; Smith, V. C.; Lohne, Ø. S.; Tomlinson, E. L.; Matthews, I. P.; Lotter, A. F.

    2012-02-01

    The Vedde Ash is the most important volcanic event marker layer for the correlation of Late Quaternary palaeoenvironmental archives in Europe and the North Atlantic. First defined from its type site localities near Ålesund, Western Norway, the Vedde Ash has now been traced across much of northern and central Europe, into northwest Russia, within North Atlantic marine sediments and into the Greenland ice cores. The Vedde Ash is thought to derive from an eruption of the Katla volcano in Iceland that occurred midway through the Younger Dryas/Greenland Stadial 1 (GS-1), ˜12.1 ka BP. Visible and cryptotephra deposits of the Vedde Ash have been found in numerous stratified sites with robust chronologies, which allow its age to be constrained and its dispersal to be mapped. The eruption must have been highly explosive, however few proximal outcrops have been confirmed and this crucial ash layer remains almost exclusively distally-described and characterised using major element glass compositions. The widespread distribution, stratigraphic associations and consistent major element glass chemistry have led the Quaternary tephrochronological community to see the Vedde Ash as a robust and unique chronological marker layer for the Last Glacial to Interglacial Transition (˜10-18 ka BP). Here we present new glass analyses of the Vedde Ash from multiple sites around the dispersal area, using a full suite of compositional analysis, including for the first time, single-grain trace element data. These data demonstrate the strong compositional coherence of Vedde Ash deposits. However, comparison with major, minor, and trace element compositional data from several other distally-described Icelandic tephras reveals that both before and after the Younger Dryas chronozone, there were eruptions that generated widespread tephra layers that have comparable glass shard compositions to the Vedde Ash. This implies that these numerous events not only hail from the same volcanic system, but

  13. Reply to comment by K.A. Duderstadt et al. on "Atmospheric ionization by high-fluence, hard spectrum solar proton events and their probable appearance in the ice core archive"

    CERN Document Server

    Laird, Claude M; Thomas, Brian C; Neuenswander, Ben; Atri, Dimitra

    2016-01-01

    Duderstadt et al. [2016b] comment that the Melott et al. [2016] study of nitrate formation by solar proton events (SPEs) and comparison with the ice core archive is "fundamentally flawed," because it does not include pre-existing HNO3 in the stratosphere. We show that they exaggerate both the enhancement predicted by our findings and pre-industrial HNO3 levels in their model, and fail to prove this assertion. Our feasibility study matched expected SPE nitrate production with ground truth measurements. It is not clear that their approach is more realistic and absence of a detailed mechanism does not disprove our results. Models can be no better than the information they are provided and in this case there continue to be significant unknowns and uncertainties, especially in the role of polar stratospheric clouds (PSCs) and possible interactions with cosmic rays that constitute lower boundary conditions. Duderstadt et al. [2014; 2016a] used incomplete, poorly-constrained and incorrect initial and boundary condit...

  14. Large-scale Ice Discharge Events in a Pure Ice Sheet Model

    Science.gov (United States)

    Alverson, K.; Legrand, P.; Papa, B. D.; Mysak, L. A.; Wang, Z.

    2004-05-01

    Sediment cores in the North Atlantic show evidence of periodic large-scale ice discharge events between 60 ka and 10 ka BP. These events occurred with a typical period between 5 kyr and 10 kyr. During each event, a significant amount of ice was discharged from the Hudson Bay region through the Hudson Strait and into the North Atlantic. This input of freshwater through the melting of icebergs is thought to have strongly affected the Atlantic thermohaline circulation. One theory is that these periodic ice discharge events represent an internal oscillation of the ice sheet under constant forcing. A second theory requires some variable external forcing on an unstable ice sheet to produce a discharge event. Using the ice sheet model of Marshall, an attempt is made to simulate periodic large-scale ice discharge events within the framework of the first theory. In this case, ice sheet surges and large-scale discharge events occur as a free oscillation of the ice sheet. An analysis of the activation of ice surge events and the thermodynamic controls on these events is also made.

  15. Sea surface temperatures in the North Atlantic Ocean from 30ka to 10ka

    Science.gov (United States)

    Barrack, Kerr; Greenop, Rosanna; Burke, Andrea; Barker, Stephen; Chalk, Thomas; Crocker, Anya

    2016-04-01

    Some of the most striking features of the Late Pleistocene interval are the rapid changes in climate between warmer interstadial and cold stadial periods which, when coupled, are termed Dansgaard-Oeschger (D-O) events. This shift between warm and cold climates has been interpreted to result from changes in the thermohaline circulation (Broecker et al., 1985) triggered by, for instance, freshwater input from the collapse of the Laurentide ice sheet (Zahn et al., 1997). However, a recent study suggests that major ice rafting events cannot be the 'trigger' for the centennial to millennial scale cooling events identified over the past 500kyr (Barker at al., 2015). Polar planktic foraminiferal and lithogenic/terrigenous grain counts reveal that the southward migration of the polar front occurs before the deposition of ice rafted debris and therefore the rafting of ice during stadial periods. Based upon this evidence, Barker et al. suggest that the transition to a stadial state is a non-linear response to gradual cooling in the region. In order to test this hypothesis, our study reconstructs sea surface temperature across D-O events and the deglaciation in the North Atlantic between 30ka and 10ka using Mg/ Ca paleothermometry in Globigerina bulloides at ODP Sites 980 and 983 (the same sites as used in Barker et al., 2015) with an average sampling resolution of 300 years. With our new record we evaluate the timing of surface ocean temperature change, frontal shift movement, and ice rafting to investigate variations in the temperature gradient across the polar front over D-O events. References: Barker, S., Chen, J., Gong, X., Jonkers, L., Knorr, G., Thornalley, D., 2015. Icebergs not the trigger for North Atlantic cold events. Nature, 520(7547), pp.333-336. Broecker, W.S., Peteer, D.M., Rind, D., 1985. Does the ocean-atmosphere system have more than one stable mode of operation? Nature, 315 (6014), pp.21-26. Zahn, R., Schönfeld, J., Kudrass, H.-R., Park, M

  16. Past climate variability between 97 and 7 ka reconstructed from a multi proxy speleothem record from Western Cuba

    Science.gov (United States)

    Winterhalder, Sophie; Scholz, Denis; Mangini, Augusto; Spötl, Christoph; Jochum, Klaus Peter; Pajón, Jesús M.

    2016-04-01

    The tropical hydrological cycle plays a key role in regulating global climate, mainly through the export of heat and moisture to higher latitudes, and is highly sensitive to climate change, for instance due to changes in the position of the Intertropical Convergence Zone (ITCZ). Previous work on Caribbean stalagmites suggests a strong connection of precipitation variability to North Atlantic (NA) sea surface temperatures on multidecadal to millenial timescales (Fensterer et al., 2012; Fensterer et al., 2013; Winter et al., 2011). Cold phases in the NA potentially lead to a southward shift of the ITCZ and thus drier conditions in Cuba. On orbital timescales, Cuban stalagmites suggest a relation of speleothem δ18O values with the δ18O value of Caribbean surface waters (Fensterer et al., 2013). Here we present an expansion of the Cuban speleothem record covering the whole last glacial period from the end of MIS5c (97 ka BP) until 7 ka with hiatuses between 93-80 ka, 37-35 ka and 13-10 ka. Stalagmite Cuba medio (CM) has been precisely dated with 60 230Th/U-ages, mainly performed by the MC-ICPMS technique. The δ18O and δ13C records are completed by a continuous, high resolution LA-ICPMS trace element profile. These data allow for the first time to establish a multi-proxy climate reconstruction for the North Western Caribbean at decadal to centennial resolution for this period. The long-term variability of the δ18O values probably reflects rainfall amount in Cuba. The response to some Dansgaard/Oeschger and Heinrich stadials confirms the previously observed correlation between Caribbean and NA climate variability. However, this connection is not clearly imprinted throughout the record. Furthermore, trace elements, such as Mg, do not proof without ambiguity drier conditions in Cuba during NA cold events, such as the Heinrich stadials. This suggests that climate variability in Cuba was more complex during the last 100ka, and that the NA was not the only driving factor

  17. KaVA ESTEMA project

    Science.gov (United States)

    Oyadomari, Miyako; Imai, Hiroshi; Cho, Se-Hyung; Asaki, Yoshiharu; Choi, Yoon-Kyong; Kim, Jaeheon; Yun, Youngjoo; Matsumoto, Naoko; Min, Cheul-Hong; Oyama, Tomoaki; Yoon, Sung-Chul; Yoon, Dong-Hwan; Kim, Dong-Jin; Dodson, Richard; Rioja, Maria; Burns, Ross; Orosz, Gabor; Nakagawa, Akiharu; Chibueze O, James; Nakashima, Jun-ichi; Sobolev, Andrey

    2016-07-01

    The ESTEMA (Expanded Study on Stellar Masers) project is one of three Large Programs of the KaVA (the combined array of the Korean VLBI Network and Japanese VLBI Exploration of Radio Astrometry), and conducted in 2015-2016. It aims to publish a database of the largest sample of VLBI images of circumstellar water (H2O) and silicon-monoxide (SiO) maser sources towards circumstellar envelopes (CSEs) of 80 evolved stars in late AGB to early post-AGB phase. Here we present the specifications of the ESTEMA observations and the planned scientific goals in order to share the basic information of the ESTEMA with astronomical community and encourage future collaborations with the ESTEMA and future follow-up observations for the targeted stars.

  18. Fade Mitigation Techniques at Ka-Band

    Science.gov (United States)

    Dissanayake, Asoka (Editor)

    1996-01-01

    Rain fading is the dominant propagation impairment affecting Ka-band satellite links and rain fade mitigation is a key element in the design of Ka-band satellite networks. Some of the common fade mitigation techniques include: power control, diversity, adaptive coding, and resource sharing. The Advanced Communications Technology Satellite (ACTS) provides an excellent opportunity to develop and test Ka-band rain impairment amelioration techniques. Up-link power control and diversity are discussed in this paper.

  19. Ka Band Parabolic Deployable Antenna (KaPDA) for Interplanetary CubeSat Communications Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Ka Band Parabolic Deployable Antenna (KaPDA) for Interplanetary CubeSat Communications allowing moving up from UHF, S or X to get higher gain for a given diameter.

  20. Response of mollusk assemblages from the Luochuan loess section to orbital forcing since the last 250 ka

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    This note presents a new result of terrestrial mollusk study from the Luochuan loess section since the last 250 ka. A total of 213 samples,taken at intervals of 10 cm in the S0-L3 portion,were analyzed for fossil mollusks. Generally,150 600 individuals were counted in each sample. According to the distribution of mollusk fossil assemblages in the loess section,11 mollusk fossil zones have been recognized,representing different climatic and ecological conditions. Three main ecological groups were identified according to the temperature and moisture requirements of each taxon. The cold-aridiphilous group shows maxima at about 240 220,190 182,150 140 and 74 66 ka BP. The thermo-humidiphilous set has high abundances for at least 6 times in the section at about 246 240,220 216,170 158,92 86,60 44 and 10 kaBP. Our results show that variations in mollusk ecological groups are related with changes in the Earth orbital parameters at the 41 and 20 ka frequencies. Maxima in thermo-humidiphilous taxa are in phase with accretion intervals of obliquity (41 ka period),reflecting the East Asian summer monsoon with 41 ka period in controlling variations in terrestrial mollusk ecological groups. In addition,maxima in thermo- humidiphilous taxa appearing at about 246 240,220 216,60 and 10 kaBP,are consistent with procession (20 ka period) maxima,indicating that the procession period also plays an important role in adjusting the ecological pattern of mollusk groups.

  1. 河流对0.8 Ma B.P.环境突变事件的地貌响应研究%Geomorphic Response of the River to the Environmental Change Event at 0.8 Ma B.P.

    Institute of Scientific and Technical Information of China (English)

    胡春生; 周迎秋

    2014-01-01

    以兰州盆地0.8 Ma B.P.阶地为例证,运用古地磁测年方法,通过收集相关文献,分析讨论了0.8 Ma B.P.阶地与0.8 Ma B.P.环境突变事件的联系。结果表明:①0.8 Ma B.P.环境突变事件主要表现在气候转型、构造运动等方面,具有群发性和全球性特点;②兰州盆地以及其他区域0.8 Ma B.P.阶地存在的证据,表明河流在0.8 Ma B.P.前后普遍发生过一次下切事件;③0.8 Ma B.P.阶地是河流对0.8 Ma B.P.环境突变事件的地貌响应,构造运动为提供了下切驱动力,而气候变化则控制了下切时间。%Based on a large number of research data on the environmental change events at 0.8 Ma B.P. and the 0.8 Ma B.P. terraces, this paper, which takes the Lanzhou Basin as an example, discusses the internal relation-ship between the 0.8 Ma B.P. terraces and the events of environmental change at 0.8 Ma B.P.. In the Lanzhou Basin, there are two river terraces, namely the Zaoshugou terrace and the Wuyishan terrace, which are selected respectively as the study terraces. For the Zaoshugou terrace, the altitude of gravel stratum is 80 m higher than the river level. The top of the gravel stratum is covered by at least 64 m eolian loess, and the paleosol S8 is at the bottom of the eolian loess. While for the Wuyishan terrace, the altitude of gravel stratum is 140 m higher than the river level. The top of the gravel stratum is overlain by about 100 m eolian loess, and the paleosol S8 is also at the bottom of the eolian loess. Through the paleomagnetic dating and loess-paleosol sequence match-ing, it is discovered that these two terraces have the same age, and both were developed at about 0.865 Ma B. P.. According to the analysis of sedimentary characteristics and the correlative literature of tectonic movement, these two terraces show significant attribute of the tectonic movement genesis. At the same time, they also have similar lithology that there is a paleosol developed on

  2. Ka-band MMIC subarray technology program (Ka-Mist)

    Science.gov (United States)

    Pottinger, W.

    1995-09-01

    Ka-band monolithic microwave integrated circuit (MMIC) arrays have been considered as having high potential for increasing the capability of space, aircraft, and land mobile communication systems in terms of scan performance, data rate, link margin, and flexibility while offering a significant reduction in size, weight, and power consumption. Insertion of MMIC technology into antenna systems, particularly at millimeter wave frequencies using low power and low noise amplifiers in closed proximity to the radiating elements, offers a significant improvement in the array transmit efficiency, receive system noise figure, and overall array reliability. Application of active array technology also leads to the use of advanced beamforming techniques that can improve beam agility, diversity, and adaptivity to complex signal environments. The objective of this program was to demonstrate the technical feasibility of the 'tile' array packaging architecture at EHF via the insertion of 1990 MMIC technology into a functional tile array or subarray module. The means test of this objective was to demonstrate and deliver to NASA a minimum of two 4 x 4 (16 radiating element) subarray modules operating in a transmit mode at 29.6 GHz. Available (1990) MMIC technology was chosen to focus the program effort on the novel interconnect schemes and packaging requirements rather than focusing on MMIC development. Major technical achievements of this program include the successful integration of two 4 x 4 subarray modules into a single antenna array. This 32 element array demonstrates a transmit EIRP of over 300 watts yielding an effective directive power gain in excess of 55 dB at 29.63 GHz. The array has been actively used as the transmit link in airborne/terrestrial mobile communication experiments accomplished via the ACTS satellite launched in August 1993.

  3. Ka-band InSAR Imaging and Analysis Based on IMU Data

    Directory of Open Access Journals (Sweden)

    Shi Jun

    2014-02-01

    Full Text Available Compared with other bands, the millimeter wave Interferometric Synthetic Aperture Radar (InSAR has high accuracy and small size, which is a hot topic in InSAR research. On the other hand, shorter wavelength causes difficulties in 2D imaging and interferometric phase extraction. In this study, the imaging and phase performance of the streaming Back Projection (BP method combined with IMU data are analyzed and discussed on the basis of actual Ka-band InSAR data. It is found that because the wavelength of the Ka-band is short, it is more sensitive to the antenna phase-center history. To ensure the phase-preserving capacity, the IMU data must be used with accurate motion error compensation. Furthermore, during data processing, we verify the flat-earth-removing capacity of the BP algorithm that calculates and compensates the master and slave antenna phase centers individually.

  4. Maximizing MST's inductive capability with a Bp programmable power supply

    Science.gov (United States)

    Chapman, B. E.; Holly, D. J.; Jacobson, C. M.; McCollam, K. J.; Morin, J. C.; Sarff, J. S.; Squitieri, A.

    2016-10-01

    A major goal of the MST program is the advancement of inductive control for the development of both the RFP's fusion potential and, synergistically, the predictive capability of fusion science. This entails programmable power supplies (PPS's) for the Bt and Bp circuits. A Bt PPS is already in place, allowing advanced RFP operation and the production of tokamak plasmas, and a Bp PPS prototype is under construction. To explore some of the new capabilities to be provided by the Bp PPS, the existing Bt PPS has been temporarily connected to the Bp circuit. One key result is new-found access to very low Ip (20 kA) and very low Lundquist number, S (104). At this low S, simulation of RFP plasmas with the MHD code NIMROD is readily achievable, and work toward validation of extended MHD models using NIMROD is underway with direct comparisons to these MST plasmas. The full Bp PPS will also provide higher Ip and S than presently possible, allowing MST to produce plasmas with S spanning as much as five orders of magnitude, a dramatic extension of MST's capability. In these initial tests, the PPS has also increased five-fold MST's Ip flattop duration, to about 100 ms. This, coupled with the recently demonstrated PPS ability to drive large-amplitude sinusoidal oscillations in Ip, will allow tests of extended-duration oscillating field current drive, the goal of which is ac sustainment of a quasi-dc plasma current. Work supported by US DOE.

  5. Climate and sea level changes and the role of shelf morphology in recording in Sibuyan Sea Basin, Philippines during the last 14 kyBP

    Science.gov (United States)

    Lloren, R. B.; Siringan, F. P.

    2014-12-01

    In this study, we reconstruct changes in precipitation using geochemical and grain size proxies and we look at how shelf morphology can influence the nature of sedimentary record of climate and oceanographic events. A 9.6m long sediment core from Sibuyan Sea basin within the internal seas of the Philippines, was raised from a water depth of 1660m. It was analyzed using an XRF core scanner at 1 cm resolution. Grain size was determined using a laser particle analyzer. Thirteen AMS radiocarbon dates from bulk organics provide age control spanning back to 14 kyBP. Overall, the trends of precipitation proxies Ti, Al and Al/Ti follow the 10o N insolation curve. A 1.4 ky periodicity rides on this general trend. But a stepwise decrease of these precipitation proxies occur at about 9ka and 4ka. The former correpond to the melt water pulse 1-c rapid sea level rise of about 15m while the latter correlates time-wise to a period of aridification. The Younger Dryas period, ca. 12.9-11.6 ka, another known dry period, does not show a shift or decrease in sediment input. Similarly, MWP -1B does no register a distinct signal in the core. The insensitivity of the core in reflecting the older climate and sea level events is attributed to the steep morphology of the sea floor where shoreline translations took place during the earlier sea level events; with a steeper sea floor, sediment sequestration near the shoreline will be low and therefore the basin will not feel much change in sediment input. For the younger climate and sea level events, the shoreline positions were already adjacent to sea floor with relatively gentler gradient where sediment sequestration is greater and where a sea level rise of a certain magnitude will translate the shoreline much farther.

  6. Impact of climate variability on terrestrial environment in Western Europe between 45 and 9 kyr cal. BP: vegetation dynamics recorded by the Bergsee Lake (Black Forest, Germany).

    Science.gov (United States)

    Duprat-Oualid, Fanny; Begeot, Carole; Rius, Damien; Millet, Laurent; Magny, Michel

    2016-04-01

    changes at millennial/pluri-millennial scale. The well-known afforestation of the Late-Glacial interstadial and the Holocene (with pine and hazel-dominated forests respectively) are recorded. Our results also reveal a three-phase sequence in the Last-Glacial. The persistence of very cold conditions between 24 and 30 kyr cal. BP favored a drastic steppe grassland. In contrast, trees proportion increased during the two other periods (14.7-24 and 30-45 kyr cal. BP) in correlation with a relative favorable climate. Second, the respons of vegetation to centennial scale climatic events is characterized by the successive rapid establishment of two different landscapes. GS are dominated by steppic taxa (Artemisia, Helianthemum), whereas more or less complete ecological successions Juniperus-Betula-Pinus seem to occur for most GIs when edaphic conditions became more favorable. Therefore, we suggest a global forcing defined by the strong impact of the climate variability on vegetation changes. We also propose the contribution of local characteristics (latitude, topography) which favored flora migration and long distance pollen inputs from refuge areas. Heiri O., Koinig K.A., Spötl C., Barrett S, Brauer A., Drescher-Schneider R., Gaar D., Ivy-Ochs S., Kerschner H., Luetscher M., Moran A., Nicolussi K., Preusser F., Schmidt R., Schoeneich P., Schwörer C., Sprafke T., Terhorst B., Tinner W. -2014- "Palaeoclimate records 60-8 ka in the Austrian and Swiss Alps and their forelands", Quaternary Science Review, 106 : 186-205.

  7. Effects of Plinian Eruptions of Somma-vesuvius On People, Animals, Structures and Objects: Inferences From Avellino (3760 Yr B.p.) and Pompei (79 A.d.) Events.

    Science.gov (United States)

    Mastrolorenzo, G.; Petrone, P. P.; Geraci, G.; Guarino, F.; Incoronato, A.

    An interdisciplinary approach to the archaeological sites affected by Avellino (3750 yr. B.P.) and Pompei (79 A.D.) plinian eruptions of Somma-Vesuvius provides new data relative to the depositional mechanisms. Large scale stratigraphy and local evi- dences provide new informations about the physical conditions at the emplacement of PDCs and their effects on structures, people and environment. Field evidences indicate that fine grained pyroclastic deposits related to the column collapses propagate up to a distance of about 15 km from the crater and emplaced with conspicuous thickness. In both Avellino and Pompei eruptions, direct evidences from archaeological sites in- dicate that the emplacement in intermediate and distal areas was relatively quite (low mechanical energy). The recognition of thin, continuous, fine grained surge deposits up to a distance of ca. 15 km from the crater suggests that turbulence was important and the PDCs advanced as a relatively thick dilute current, very poorly controlled by the topography. Furthermore, due to the very small sizes, the particles were always transported in suspension, even at very low current velocity, thus avoiding vertical grading to occur. However, due to the very high depositional mass rate, the emplace- ment was very rapid causing buildings and hut, objects, animals and people to be engulfed within the ash deposits thus preserving their original position, as seen at Herculaneum, Oplontis, Pompeii (79 AD) and Nola (3760 bp). The skeletons of hu- man as well animal victims show high temperature effects. In particular, microscopic bones texture of the victims in the sites affected by the 79 A.D are consistent with very high temperatures, which are anomalous in pyroclastic surge clouds.

  8. Environment and paleoecology of a 12 ka mid-North American Younger Dryas forest chronicled in tree rings

    Science.gov (United States)

    Panyushkina, Irina P.; Leavitt, Steven W.; Thompson, Todd A.; Schneider, Allan F.; Lange, Todd

    2008-01-01

    Until now, availability of wood from the Younger Dryas abrupt cooling event (YDE) in N. America ca. 12.9 to 11.6 ka has been insufficient to develop high-resolution chronologies for refining our understanding of YDE conditions. Here we present a multi-proxy tree-ring chronology (ring widths, “events” evidenced by microanatomy and macro features, stable isotopes) from a buried black spruce forest in the Great Lakes area (Liverpool East site), spanning 116 yr at ca. 12,000 cal yr BP. During this largely cold and wet period, the proxies convey a coherent and precise forest history including frost events, tilting, drowning and burial in estuarine sands as the Laurentide Ice Sheet deteriorated. In the middle of the period, a short mild interval appears to have launched the final and largest episode of tree recruitment. Ultimately the tops of the trees were sheared off after death, perhaps by wind-driven ice floes, culminating an interval of rising water and sediment deposition around the base of the trees. Although relative influences of the continental ice sheet and local effects from ancestral Lake Michigan are indeterminate, the tree-ring proxies provide important insight into environment and ecology of a N. American YDE boreal forest stand.

  9. Evidence for Indonesian Throughflow slowdown during Heinrich events 3-5

    Science.gov (United States)

    Zuraida, Rina; Holbourn, Ann; Nürnberg, Dirk; Kuhnt, Wolfgang; Dürkop, Anke; Erichsen, A.

    2009-06-01

    We present sea surface and upper thermocline temperature records (60-100 year temporal resolution) spanning marine isotope stage 3 (˜24-62 ka B.P.) from International Marine Global Change Study core MD01-2378 (121°47.27'E and 13°04.95'S; 1783 m water depth) located in the outflow area of the Indonesian Throughflow within the Timor Sea. Stable isotopes and Mg/Ca of the near-surface-dwelling planktonic foraminifer Globigerinoides ruber (white) and the upper thermocline-dwelling Pulleniatina obliquiloculata reveal rapid changes in the thermal structure of the upper ocean during Heinrich events. Thermocline warming and increased δ18Oseawater (P. obliquiloculata record) during Heinrich events 3, 4, and 5 reflect weakening of the relatively cool and fresh thermocline flow and reduced export of less saline water from the North Pacific and Indonesian Seas to the tropical Indian Ocean. Three main factors influenced Indonesian Throughflow variability during marine isotope stage 3: (1) global slowdown in thermohaline circulation during Heinrich events triggered by Northern Hemisphere cooling, (2) increased freshwater export from the Java Sea into the Indonesian Throughflow controlled by rising sea level from ˜60 to 47 ka, and (3) insolation-related changes in the Australasian monsoon with associated migration of hydrological fronts between Indian Ocean- and Indonesian Throughflow-derived water masses at ˜46-40 ka.

  10. Hydrological variability in northern Levant over the past 250 ka

    Directory of Open Access Journals (Sweden)

    F. Gasse

    2011-05-01

    Full Text Available The Levant features sharp climatic gradients from North to South and from West to East resulting in a large environmental diversity. The lack of long-term record from the northern Levant limits our understanding of the regional response to glacial-interglacial boundary conditions in this key area. The 250 ka paleoenvironmental reconstruction presented here is a first step to fill this geographical gap.

    The record comes from a 36 m lacustrine-palustrine sequence cored in the small intra-mountainous karstic basin of Yammoûneh (northern Lebanon. The paper combines times series of sediment properties, paleovegetation, and carbonate oxygen isotopes, to yield a comprehensive view of paleohydrologic-paleoclimatic fluctuations in the basin over the two last glacial-interglacial cycles. Efficient moisture was higher than today during interglacial peaks around 240, 215–220, ~130–120 ka and 11–9 ka (although under different Precipitation minus Evaporation balance. Moderate wetting events took place around 170, 150, 105–100, 85–75, 60–55 and 35 ka. The penultimate glacial period was generally wetter than the last glacial stage. Local aridity culminated from the LGM to 15 ka, possibly linked to water storage as ice in the surrounding highlands. An overall decrease in local water availability is observed from the profile base to top. Fluctuations in available water seem to be primarily governed by changes in local summer insolation controlled by the orbital eccentricity modulated by the precession cycle, and by changes in precipitation and temperature seasonality.

    Our record is roughly consistent with long-term climatic fluctuations in northeastern Mediterranean lands, except during the penultimate glacial phase. It shares some features with speleothem records of western Israel. Conversely, after 130 ka, it is clearly out of phase with hydrological changes in the Dead Sea basin. Potential causes of these spatial heterogeneities

  11. Event layers in the Japanese Lake Suigetsu 'SG06' sediment core: description, interpretation and climatic implications

    Science.gov (United States)

    Schlolaut, Gordon; Brauer, Achim; Marshall, Michael H.; Nakagawa, Takeshi; Staff, Richard A.; Bronk Ramsey, Christopher; Lamb, Henry F.; Bryant, Charlotte L.; Naumann, Rudolf; Dulski, Peter; Brock, Fiona; Yokoyama, Yusuke; Tada, Ryuji; Haraguchi, Tsuyoshi

    2014-01-01

    Event layers in lake sediments are indicators of past extreme events, mostly the results of floods or earthquakes. Detailed characterisation of the layers allows the discrimination of the sedimentation processes involved, such as surface runoff, landslides or subaqueous slope failures. These processes can then be interpreted in terms of their triggering mechanisms. Here we present a 40 ka event layer chronology from Lake Suigetsu, Japan. The event layers were characterised using a multi-proxy approach, employing light microscopy and μXRF for microfacies analysis. The vast majority of event layers in Lake Suigetsu was produced by flood events (362 out of 369), allowing the construction of the first long-term, quantitative (with respect to recurrence) and well dated flood chronology from the region. The flood layer frequency shows a high variability over the last 40 ka, and it appears that extreme precipitation events were decoupled from the average long-term precipitation. For instance, the flood layer frequency is highest in the Glacial at around 25 ka BP, at which time Japan was experiencing a generally cold and dry climate. Other cold episodes, such as Heinrich Event 1 or the Late Glacial stadial, show a low flood layer frequency. Both observations together exclude a simple, straightforward relationship with average precipitation and temperature. We argue that, especially during Glacial times, changes in typhoon genesis/typhoon tracks are the most likely control on the flood layer frequency, rather than changes in the monsoon front or snow melts. Spectral analysis of the flood chronology revealed periodic variations on centennial and millennial time scales, with 220 yr, 450 yr and a 2000 yr cyclicity most pronounced. However, the flood layer frequency appears to have not only been influenced by climate changes, but also by changes in erosion rates due to, for instance, earthquakes.

  12. AltiKa in-flight performances

    Science.gov (United States)

    Boy, Francois; Desjonquères, Jean-Damien; Steunou, Nathalie

    2015-04-01

    The SARAL/AltiKa satellite has been launched the 25th of February 2013 from the launch pad of Sriharikota (India). Since this date, AltiKa provides measurements and affords the first altimetry results in Ka band. This paper recalls the instrument design and assesses the in-flight performance. The SARAL/AltiKa mission has been developed in the frame of a cooperation between CNES (French Space Agency) and ISRO (Indian Space Research Organization). AltiKa is a single frequency Ka-band altimeter with a bi-frequency radiometer embedded. Both altimeter and radiometer share the same antenna. Altimeter expertise and routine calibrations performed during assessment phase demonstrate the stability of the instrument. Moreover the performance assessed over ocean are noteworthy such as 0.9 cm on epoch 1 Hz noise for 2 m of SWH, which is fully consistent with simulations and ground pre-flight tests results. The data availability is also very good and very few altimeter measurements are lost due to rain attenuation. Radiometer data analysis shows that the instrument is very stable and its performances are consistent with pre-flight tests results.

  13. Ionization constants pKa of cardiolipin.

    Directory of Open Access Journals (Sweden)

    Gerd Olofsson

    Full Text Available Cardiolipin is a phospholipid found in the inner mitochondrial membrane and in bacteria, and it is associated with many physiological functions. Cardiolipin has a dimeric structure consisting of two phosphatidyl residues connected by a glycerol bridge and four acyl chains, and therefore it can carry two negative charges. The pKa values of the phosphate groups have previously been reported to differ widely with pKa1 = 2.8 and pKa2 = 7.5-9.5. Still, there are several examples of experimental observations from cardiolipin-containing systems that do not fit with this dissociation behavior. Therefore, we have carried out pH-titration and titration calorimetric experiments on two synthetic cardiolipins, 1,1',2,2'-tetradecanoyl cardiolipin, CL (C14:0, and 1,1',2,2'-tetraoctadecenoyl cardiolipin, CL (C18:1. Our results show that both behave as strong dibasic acids with pKa1 about the same as the first pKa of phosphoric acid, 2.15, and pKa2 about one unit larger. The characterization of the acidic properties of cardiolipin is crucial for the understanding of the molecular organization in self-assembled systems that contain cardiolipin, and for their biological function.

  14. Patterns of millennial variability over the last 500 ka

    Directory of Open Access Journals (Sweden)

    M. Siddall

    2010-01-01

    Full Text Available Millennial variability is a robust feature of many paleoclimate records, at least throughout the last several glacial cycles. Here we use the signal from an Antarctic climate event to probe the EPICA Dome C temperature proxy reconstruction through the last 500 ka for similar millennial-scale events. We find that clusters of millennial events occurred in a regular fashion over half of the time during this with a mean recurrence interval of 21 kyr. We find that there is no consistent link between ice-rafted debris deposition and millennial variability. Instead we speculate that changes in the zonality of atmospheric circulation over the North Atlantic form a viable alternative to freshwater release from icebergs as a trigger for millennial variability. We suggest that millennial changes in the zonality of atmospheric circulation over the North Atlantic are linked to precession and that this relationship is modified by the presence of the large, Northern Hemisphere ice sheets during glacial periods.

  15. Impact of relative sea level and extreme climate events on the Southern Skhira coastline (Gulf of Gabes, Tunisia) during Holocene times: Ostracodes and foraminifera associations' response

    Science.gov (United States)

    Zaïbi, Chahira; Kamoun, Fekri; Viehberg, Finn; Carbonel, Pierre; Jedoui, Younes; Abida, Habib; Fontugny, Michel

    2016-06-01

    This study examines the evolution of the Skhira coast (Southeastern Tunisia) during Holocene times, by analyzing ostracodes, foraminifera and mollusk associations in subsurface sediments of both sebkhas of Dreîaa and El Guettiate. Nine biofacies represented by (1) five categories of lagoon namely widely opened, opened, brackish estuarine, closed and emerged; (2) the maximum of closure of environment revealed by continental and sebkha biofacies; (3) a peculiar two biofacies, formed by coarse sands or shelly clays and dominated by mollusk fragments and showing a mixture of lagoonal, marine and brackish taxa of mollusk, ostracods and foraminifera which provide evidence of high energy events (storms). The lower Holocene continental sediments are overlain by two transgressive categories of biofacies. The first one corresponds to a widely opened lagoon biofacies, related to the first Holocene marine transgression, around 7.46 ka cal BP. The second one, more important, consists of an opened lagoon biofacies between 6.67 and 5.91 ka cal BP. Sudden changes, during Holocene time, in the numerical distribution of foraminifera and ostracods species up cores are used to infer the change from widely opened lagoon, subjected to estuarine influences, to sebkha by passing by a close lagoonal environment. The enrichment of the sediment in quartz grains coupled with the action of the current drift authorized the build-up of sandy spits in front of the estuaries and the genesis of lagoon that preserve a rich assemblage of euryhaline foraminifera, ostracods and mollusks species. This process was interrupted by two distinct high-energy events. The break of sand spits induced the introduction of washover clay deposits at 5.418 ka cal BP and washover coarse sands at 644 a cal BP rich in mixture of brackish and marine macrofauna and microfauna.

  16. Detrital carbonate peaks on the Labrador shelf, a 13-7 ka template for freshwater forcing from the Hudson Strait outlet of the Laurentide Ice Sheet into the subpolar gyre

    Science.gov (United States)

    Jennings, Anne; Andrews, John; Pearce, Christof; Wilson, Lindsay; Ólfasdótttir, Sædís

    2015-01-01

    The Laurentide Ice Sheet (LIS) was a large, dynamic ice sheet in the early Holocene. The glacial events through Hudson Strait leading to its eventual demise are recorded in the well-dated Labrador shelf core, MD99-2236 from the Cartwright Saddle. We develop a detailed history of the timing of ice-sheet discharge events from the Hudson Strait outlet of the LIS during the Holocene using high-resolution detrital carbonate, ice rafted detritus (IRD), δ18O, and sediment color data. Eight detrital carbonate peaks (DCPs) associated with IRD peaks and light oxygen isotope events punctuate the MD99-2236 record between 11.5 and 8.0 ka. We use the stratigraphy of the DCPs developed from MD99-2236 to select the appropriate ΔR to calibrate the ages of recorded glacial events in Hudson Bay and Hudson Strait such that they match the DCPs in MD99-2236. We associate the eight DCPs with H0, Gold Cove advance, Noble Inlet advance, initial retreat of the Hudson Strait ice stream (HSIS) from Hudson Strait, opening of the Tyrrell Sea, and drainage of glacial lakes Agassiz and Ojibway. The opening of Foxe Channel and retreat of glacial ice from Foxe Basin are represented by a shoulder in the carbonate data. ΔR of 350 years applied to the radiocarbon ages constraining glacial events H0 through the opening of the Tyrell Sea provided the best match with the MD99-2236 DCPs; ΔR values and ages from the literature are used for the younger events. A very close age match was achieved between the 8.2 ka cold event in the Greenland ice cores, DCP7 (8.15 ka BP), and the drainage of glacial lakes Agassiz and Ojibway. Our stratigraphic comparison between the DCPs in MD99-2236 and the calibrated ages of Hudson Strait/Bay deglacial events shows that the retreat of the HSIS, the opening of the Tyrell Sea, and the catastrophic drainage of glacial lakes Agassiz and Ojibway at 8.2 ka are separate events that have been combined in previous estimates of the timing of the 8.2 ka event from marine records

  17. The palaeogeographic setting and the local environmental impact of the 130 ka Falconiera tuff-cone eruption (Ustica island, Italy)

    Science.gov (United States)

    de Vita, Sandro; Foresta Martin, Franco

    2017-04-01

    This research focuses on the effects of the last eruption at Ustica (Suthern Tyrrhenian Sea, Italy), which formed the Falconiera tuff-cone at around 130 ka BP in the north-eastern tip of the island. This eruption was mainly explosive and phreatomagmatic, and emplaced a series of pyroclastic surge beds that formed an asymmetric tuff cone. This is the most easily recognizable volcanic edifice on Ustica, although its north-eastern sector has been partially eroded. A section of the feeding conduit is exposed northward, and is composed of lavas that fed the last stages of the eruption characterized by an intracrateric lava lake and a Strombolian scoria-fallout deposit. The eruption occurred during Upper Pleistocene Marine Isotopic Substage 5.5, a warm period characterized by a high sea-level stand (6±3 m above the present sea level in stable areas) and the diffusion of subtropical flora and fauna across the Mediterranean sea. This eruption slightly modified the morphology of Ustica, but impacted both marine and terrestrial environments, burying beach deposits rich in mollusk shells (i.e. Strombus bubonius, Conus testudinarius, Brachidontes puniceus), colonies of corals (Cladocora caespitosa) and subaerial plants (Chamaerops humilis). These organisms, found in some cases in their life position, along with other lines of evidence, provide information on the palaeogeography of this sector of the island at the time of the eruption, and on the local impact of this event on the environment.

  18. Changes in the content of eolian iron during the past 900 ka and the implications

    Institute of Scientific and Technical Information of China (English)

    WEI Jianjing; GUO Zhengtang

    2003-01-01

    In this study, total Fe2O3 content (Fet) in two parallel sections fromthe central Loess Plateau (Xifeng and Changwu) is analyzed to address the variations of eolian iron in the past 900 ka. The obtained timeseries indicate that Fet values in some glacial intervals are comparable to that of interglacial periods and its oscillations do not generally correspond to the long-term glacial-interglacial changes. Rather, it exhibits higher frequency fluctuations without detectable 100 ka period, but with a strong 20 ka period and a clear 40 ka period. The combination of 20 ka and 40 ka periods suggest that eolian iron content was relatively independent of glacial-interglacial changes, but more strongly influenced by the insolation changes in the northern hemisphere. Higher iron content was observed for the S5-1 soil that is correlative to marine δ 18O stage 13. In marine records, this stage is characterized by higher δ 13C values, suggesting that the event is of global significance.

  19. Data of evolutionary structure change: 1KA4A-1WGZA [Confc[Archive

    Lifescience Database Archive (English)

    Full Text Available 1KA4A-1WGZA 1KA4 1WGZ A A EVFQNETIKQILAKYRRIWAIGHAQSVLGWDLEVNMPKE...confEVID> 0 1KA4 A 1KA4A...tryChain> 1KA4 A 1KA4A FPLGTRARLD... CA 334 SER CA 255 1KA4 A 1KA4A LEEGKVPREHP HH

  20. Timing of wet episodes in Atacama Desert over the last 15 ka. The Groundwater Discharge Deposits (GWD) from Domeyko Range at 25°S.

    Science.gov (United States)

    Sáez, Alberto; Godfrey, Linda V.; Herrera, Christian; Chong, Guillermo; Pueyo, Juan J.

    2016-08-01

    A chronologically robust reconstruction of timing and dynamics of millennial time scale wet episodes encompassing the entire Atacama Desert during the last 15 ka has been constructed. To accomplish this, a new composite paleoclimatic record from Groundwater Discharge Deposits (GWD) in the Sierra de Varas (Domeyko Range, southern Atacama in Chile at 25°S) has been compiled and compared with other published paleohydrologic records from the Atacama region. In Sierra de Varas (SV), three millennial timescale wet climate phases have been characterized: around 14.5 ka cal BP, 12.2-9.8 ka cal BP, and 4.7 ka cal BP to the present day. These wet phases are interpreted from intervals of GWD facies formed during periods when the springs were active. GWD facies include: (1) black organic peat, rooted mudstones and sandstones formed in local wetland environments, and (2) gypsum-carbonate rich layers formed by interstitial growth. GWD intervals alternate with gravelly alluvial material deposited during arid phases. A trend towards less humid conditions during the Late Holocene wet episode characterizes GWD sedimentary series in Sierra the Varas, suggesting the onset of a dry episode over the last few centuries. Around 0.7 ka BP a very short wet episode is recorded in the central part of the desert suggesting this was the time of maximum humidity for the entire late Holocene wet period. A brief arid phase occurred between 1.5 and 2.0 ka BP indicated by the absence of GWD in the Domeyko Range. The paleoclimatic reconstruction encompassing the entire Atacama region shows that both the intensity and occurrence of wetter conditions were governed mainly by the distance to the source of moisture, and secondarily by the elevation of the sites. In the northern Atacama (16-20°S), four wet phases fed by N-NE summer monsoon precipitations have been proposed: Tauca phase (18-14 ka cal BP) and Coipasa phase (13-10 ka cal BP) during the Late Glacial, followed by Early Holocene and Late

  1. Subtropical freshwater event at the onset of Younger Dryas

    Science.gov (United States)

    Weinelt, M.; Repschläger, J.; Balmer, S.; Schwab, C.; Andersen, N.; Blanz, T.; Sarnthein, M.

    2012-12-01

    The Younger Dryas (YD) (12.79-11.6 ka BP) cold spell during the last deglaciation is associated with a major breakdown of the Atlantic meridional overturning circulation (AMOC), the details of which are still controversial. Catastrophic events like a bolide impact or a major outflow of meltwater stored in the proglacial Lake Agassiz, which led to the capping of North Atlantic deep water convection sites, have been suggested to trigger the AMOC shutdown. However the geomorphological evidence for such a meltwater flood is not in agreement with the timing of the YD. Also, the YD was postulated to be part of a deglacial sequence of events generally characteristic of glacial terminations involving the displacement of major climatic zones and oceanographic fronts. We present detailed paleoceanographic records from sediment cores MD08-3180/ GEOFAR KF16 (38°N; 31.13°W, 3050 m w.d.) retrieved immediately east of the Mid Atlantic ridge south of the Azores Islands. At present, this site is located at the northern rim of the Azores Current, which delineates the subtropical gyre, recirculating warm waters of the North Atlantic Current. Due to its position at the boundary between temperate North East Atlantic waters and subtropical gyre waters, the site is ideally suited to trace past changes in the alternating influence of both water masses. Parallel stable-oxygen isotope records of surface water dwelling foraminifera Globigerinoides ruber w. (habitat depth 0-25m) and Globigerina bulloides (habitat depth 0-300m) may document the structure of surface waters. Sea Surface Temperatures (SST) were derived from the UK'37 index and from planktonic foraminifera (PF) assemblages using transfer functions. d18Ow-ice and Sea Surface Salinities were estimated using the d18O G.ruber w. record corrected for SST and changes in global ice volume. The d18O records of G.ruber w. and G.bulloides diverge between 13.4 ka and 12.95 ka BP. d18Ow data show a gradual increase in the freshening of

  2. A 20-ka reconstruction of a Sahelo-Sudanian paleoenvironment using multi-method dating on pedogenic carbonate

    Science.gov (United States)

    Diaz, Nathalie; Dietrich, Fabienne; King, Georgina E.; Valla, Pierre G.; Sebag, David; Herman, Frédéric; Verrecchia, Eric P.

    2016-04-01

    Soils can be precious environmental archives as they are open systems resulting from external persistent disturbance, or forcing (Jenny, 1941). Pedogenic carbonate nodules associated with clay-rich soils have been investigated in the Far North region of Cameroon in non-carbonate watersheds (Chad Basin). Nodule bearing soils have mima-like mound morphologies, within stream networks. Such settings raise questions on the processes leading to carbonate precipitation as well as landscape genesis. The mima-like mounds have been identified as degraded Vertisols, resulting from differential erosion induced by a former gilgai micro-relief (Diaz et al., 2016). Non-degraded Vertisols occur in waterlogged areas, located downstream from mima-like mound locations (Braband and Gavaud, 1985). Therefore during a former wetter period Vertisols may have been extended to the mima-like mound areas, followed by a shift toward drier conditions and erosion (Diaz et al., 2016). Consequently, mima-like mounds and associated carbonate nodules are inherited from climatic changes during the Late Pleistocene-Holocene period. The aim of this study is to validate the scenario above using the carbonate nodules collected in a mima-like mound as time archives. Optically stimulated luminescence (OSL) dating of K-feldspars trapped within the nodules is used to assess the deposition time of the soil parent material, composing the mima-like mounds. The carbonate and organic nodule parts have been radiocarbon dated with the aim of assessing the carbonate precipitation age and the age range of soil formation, respectively. Results show that the soil parent material was deposited between 18 ka and 12 ka BP and that the nodules precipitated between 7 ka and 5 ka BP. These results suggest that the deposition occurred during the arid climatic period of the Bossoumian (20 ka to 15 ka BP; Hervieu, 1970) and during the first drier part of the African Humid Period (14.8 ka to 11.5 ka BP; deMenocal et al., 2000

  3. The Mars Global Surveyor Ka-Band Link Experiment (MGS/KaBLE-II)

    Science.gov (United States)

    Morabito, D.; Butman, S.; Shambayati, S.

    1999-01-01

    The Mars Global Surveyor (MGS) spacecraft, launched on November 7, 1996, carries an experimental space-to-ground telecommunications link at Ka-band (32 GHz) along with the primary X-band (8.4-GHz) downlink. The signals are simultaneously transmitted from a 1.5-m-diameter parabolic antenna on MGS and received by a beam-waveguide (BWG) research and development (R&D) 34-meter a ntenna located in NASA's Goldstone Deep Space Network (DSN) complex near Barstow, California. This Ka-band link experiment (KaBLE-II) allows the performances of the Ka-band and X-band signals to be compared under nearly identical conditions. The two signals have been regularly tracked during the past 2 years. This article presents carrier-signal-level data (P_c/N_o) for both X-band and Ka-band acquired over a wide range of station elevation angles, weather conditions, and solar elongation angles. The cruise phase of the mission covered the period from launch (November 7, 1996) to Mars orbit capture (September 12, 1997). Since September 12, 1997, MGS has been in orbit around Mars. The measurements confirm that Ka-band could increase data capacity by at least a factor of three (5 dB) as compared with X-band. During May 1998, the solar corona experiment, in which the effects of solar plasma on the X-band and Ka-band links were studied, was conducted. In addition, frequency and difference frequency (f_x - f_(Ka)/3.8), ranging, and telemetry data results are presented. MGS/KaBLE-II measured signal strengths (for 54 percent of the experiments conducted) that were in reasonable agreement with predicted values based on preflight knowledge, and frequency residuals that agreed between bands and whose statistics were consistent with expected noise sources. For passes in which measured signal strengths disagreed with predicted values, the problems were traced to known deficiencies, for example, equipment operating under certain conditions, such as a cold Ka-band solid-state power amplifier (SSPA

  4. Paleointensities on 8 ka obsidian from Mayor Island, New Zealand

    Directory of Open Access Journals (Sweden)

    A. Ferk

    2011-11-01

    Full Text Available The 8 ka BP (6050 BCE pantelleritic obsidian flow on Mayor Island, Bay of Plenty, New Zealand, has been investigated using 30 samples from two sites. Due to a very high paramagnetic/ferromagnetic ratio, it was not possible to determine the remanence carriers. This is despite the fact that the samples were studied intensively at low, room, and high temperatures. We infer that a stable remanence within the samples is carried by single- or close to single-domain particles. Experiments to determine the anisotropy of thermoremanence tensor and the dependency on cooling rate were hampered due to alteration resulting from the repeated heating of the samples to temperatures just below the glass transition. Nonetheless, a well-defined mean paleointensity of 57.0 ± 1.0 μT, based on individual high quality paleointensity determinations, was obtained. This field value compares very well to a paleointensity of 58.1 ± 2.9 μT, which Tanaka et al. (2009 obtained for 5500 BCE at a site 100 km distant. Agreement with geomagnetic field models, however, is poor. Thus, gathering more high-quality paleointensity data for the Pacific region and for the southern hemisphere in general to better constrain global field models is very important.

  5. Modulation transfer functions at Ka band

    Science.gov (United States)

    Hesany, Vahid; Sistani, Bita; Salam, Asif; Haimov, Samuel; Gogineni, Prasad; Moore, Richard K.

    The modulation transfer function (MTF) is often used to describe the modulation of the radar signal by the long waves. MTFs were measured at 35 GHz (Ka band) with a switched-beam vector slope gauge/scatterometer on the research platform NORDSEE as part of the SAXON-FPN experiment. Three independent measurements of the scattering were available for each height measurement. This provided the opportunity to average the time series to reduce the effects of fading noise and sea spikes, or, alternatively, to append the time series to achieve more degrees of freedom in the spectral estimates. For upwind measurements, the phase of the VV-polarized Ka-band MTF was always positive, which implies that the maximum of the radar return originates from the forward face of the long-scale waves. This phase increases with increasing wind speed. The magnitude of the MTF decreases with increasing wind speed.

  6. KaKa带你杀大网

    Institute of Scientific and Technical Information of China (English)

    昊月

    2005-01-01

    上期和大家一起漫步dust2,体会了其中的妙处,这期KaKa带你去inferno这张地图探个究竟。inferno是一张对于警匪都比较平衡的地图,攻守都有各自的优势,如何利用这些优势让自己在大网里的杀人数剧增,是KaKa这期要告诉大家的重点。上次KaKa教大家如果做匪徒在大网里杀人,这次咱做警察,练练如何在大网里防守,这次我们进一个开局金钱数16000的大网里,免得初期还要手枪肉搏。一切准备就绪,开局买上M4,炸宙,闪光再带把拆包器,可能会有人有疑问。”又不是打比赛,要买拆包器干吗?杀光敌人不就得了吗。”KaKa在这里还要提醒你一点.1.5版和1.6版其中的一个小区别就是如果警察成功拆除炸弹的话,可以增加3个杀人数,所以只要有机会就奋不顾身去抢拆包,这也算是提高自己在大网里杀人数一个“歪门邪道”,可比你和3个匪徒周旋半天划得来哦。

  7. Eolian depositional phases during the past 50 ka and inferred climate variability for the Pampean Sand Sea, western Pampas, Argentina

    Science.gov (United States)

    Tripaldi, Alfonsina; Forman, Steven L.

    2016-05-01

    The Pampean Sand Sea, which occurs from the Argentinian Pampas to the eastern Andean piedmont, hosts presently stabilized dune fields spanning the late Quaternary. This study integrates previous results and presents new geomorphic, stratigraphic, sedimentological, and chronologic data for nineteen >2 m-thick eolian successions for the San Luis paleo-dune field, western Pampas, to better constrain the depositional history. Six eolian depositional phases are identified spanning the past 50 ka, interposed with paleosols and/or bounded by erosive surfaces. Age control was from 61 OSL ages of small aliquots of quartz grains from eolian stratigraphic units. The inferred timing of eolian phases are at ca. 70 ± 10 yr, 190 ± 20 yr, 12 to 1 ka, 22 to 17 ka, 29 to 24 ka, and 40 to 32 ka. A maximum span for periods of pedogenesis at ca. 12 to 17 ka, 22 to 24 ka, and 29 to 32 ka was provided by bounding OSL ages, which broadly overlap with high stands of pluvial lakes and glacier advances in the central Andes. We infer that the added precipitation may reflect expansion of the Southern Hemisphere monsoon, associated with Northern Hemisphere Heinrich events, leading to episodes of significantly wetter conditions (>350 mm MAP) to at least 35° S. Most of the Holocene (12 ka to 0.8 ka) was characterized by sand sheet deposit under drier than present conditions (100-450 mm MAP), associated with Monte-type vegetation (shrub steppe). The latest two eolian depositional phases, occurred at ca. 190 and 70 yr ago, during the historic period with European settlement and are related to anthropogenic landscape disturbance, though the youngest phase was concomitant with 1930s drought. Wet conditions dominated since ca. AD 1970 with new lakes and rivers forming across this eolian terrain; an incongruous environmental response in reference to drier conditions for most of the Holocene.

  8. A Discussion on the Effects of Deteriorated Environment Event on the Neolithic Culture of China, around 5 000 a BP%距今五千年左右环境恶化事件对我国新石器文化的影响及其原因的初步探讨

    Institute of Scientific and Technical Information of China (English)

    朱艳; 陈发虎; 张家武; 安成邦

    2001-01-01

    距今五千年左右全球普遍存在一次变化幅度较大的突发性环境恶化事件,此事件导致各地生态环境发生了较大的变化,与此同时的我国新石器文化表现为衰退和在某些地点的中断.气候环境变化是该时段影响人类文化发展变化的主要因素.环境变化对史前文化影响的可能原因是:气候变化导致生态环境变化,生态环境变化导致直接影响人类生存的生物营养源的变化,进而导致史前文化的变化.%A number of environmental records reveal that there was a rapid environmental deterioating event all over the world ca 5000 a BP. During this period, there was a movement of vegetations zone to south in the southern China, lower sea level along the coast in the southern and eastern China, and desertification in some sites of northern China. Meanwhile, there was a fargoing regradation or discontinuity of Neolithic culture in China. Furthermore, we have noticed some special clues which would help us to insure the result that deteriorated environment caused deteriorating of planting plants. For example, comparisons between early and late epochs of ca 5000 a BP. find that the sites number of the millet dud out declined in Yellow River drainage area; just only straw and shuck of paddy were discovered in the archaeological sites without rice in Yangtse River delta; the activities of fishing-hunting were less, yet activities of feeding domestic animal were more all over China ca 5000 a BP. At the same time, there were also many records of the state of culture development consistent with the environmental changes all over the world. We propose that the degradation and discontinuity of Neolithic culture was caused by the deteriorated environmental conditions. It may be the environmental changes that affected the prehistoric culture. Vegetations are the nutrition resources of human. The past global changes (PAGES) have validated that climatic changes is at bottom of the changes

  9. Pollen-based paleoenvironmental and paleoclimatic change at Lake Ohrid (SE Europe during the past 500 ka

    Directory of Open Access Journals (Sweden)

    L. Sadori

    2015-09-01

    Full Text Available Lake Ohrid is located at the border between FYROM and Albania and formed during the latest phases of Alpine orogenesis. It is the deepest, the largest and the oldest tectonic lake in Europe. To better understand the paleoclimatic and paleoenvironmental evolution of Lake Ohrid a deep drilling was carried out in 2013 within the framework of the Scientific Collaboration on Past Speciation Conditions (SCOPSCO project that was funded by the International Continental Drilling Program (ICDP. Preliminary results indicate that lacustrine sedimentation of Lake Ohrid started between 1.2 and 1.9 Ma ago. Here we present new pollen data (selected percentage and concentration taxa/groups of the uppermost ~200 m of the 569 m-long DEEP core drilled in the depocenter of Lake Ohrid. The study is the fruit of a cooperative work carried out in several European palynological laboratories. The age model is based on nine tephra layers and on tuning of biogeochemical proxy data to orbital parameters and to the global benthic isotope stack LR04. According to the age model the studied sequence covers the last ~500 000 years at a millennial-scale resolution (~1.6 ka and record the major vegetation and climate changes that occurred during the last 12 (13 only pro parte marine isotope stages (MIS. Our results indicate that there is a general good correspondence between forested/non-forested periods and glacial/interglacial cycles of marine isotope stratigraphy. Our record shows a progressive change from cooler and wetter to warmer and dryer interglacial conditions. This shift is visible also in glacial vegetation. The interglacial phase corresponding to MIS11 (pollen assemblage zone, PAZ OD-12, 488–455 ka BP and OD-19, 367–328 ka BP is dominated by montane trees such as conifers. The two younger interglacial periods, MIS5 (PAZ OD-3, 126–70 ka BP and MIS1 (PAZ OD-1, 12 ka BP to present are marked by dominance of mesophilous elements such as deciduous and semi

  10. Validation of GPM Ka-Radar Algorithm Using a Ground-based Ka-Radar System

    Science.gov (United States)

    Nakamura, Kenji; Kaneko, Yuki; Nakagawa, Katsuhiro; Furukawa, Kinji; Suzuki, Kenji

    2016-04-01

    GPM led by the Japan Aerospace Exploration Agency (JAXA) and the National Aeronautics and Space Administration of US (NASA) aims to observe global precipitation. The core satellite is equipped with a microwave radiometer (GMI) and a dual-frequency radar (DPR) which is the first spaceborne Ku/Ka-band dual-wavelength radar dedicated for precipitation measurement. In the DPR algorithm, measured radar reflectivity is converted to effective radar reflectivity by estimating the rain attenuation. Here, the scattering/attenuation characteristics of Ka-band radiowaves are crucial, particularly for wet snow. A melting layer observation using a dual Ka-band radar system developed by JAXA was conducted along the slope of Mt. Zao in Yamagata Prefecture, Japan. The dual Ka-band radar system consists of two nearly identical Ka-band FM-CW radars, and the precipitation systems between two radars were observed in opposite directions. From this experiment, equivalent radar reflectivity (Ze) and specific attenuation (k) were obtained. The experiments were conducted for two winter seasons. During the data analyses, it was found that k estimate easily fluctuates because the estimate is based on double difference calculation. With much temporal and spatial averaging, k-Ze relationship was obtained for melting layers. One of the results is that the height of the peak of k seems slightly higher than that of Ze. The results are compared with in-situ precipitation particle measurements.

  11. RECORDS OF HIGH-RESOLUTION CLIMATE EVENTS FROM STALAGMITES SINCE 160000 a B.P.IN GUANGXI AND GUIZHOU PROVINCES, CHINA%黔桂地区最近16万年高分辨率石笋记录的气候事件

    Institute of Scientific and Technical Information of China (English)

    覃嘉铭; 袁道先; 林玉石; 张美良

    2001-01-01

    Global change is a modern frontier project of earth science. Inorder to predict future climate change and well understand the dynamic process of earth evolution, the high-resolution climate change history of the last two glaciations must be studied and reconstructed. On the basis of sedimentation investigation of several large stalagmites, the high-resolution record of climate change since 160 000a B.P. in Guangxi and Guizhou provinces have been studied using carbon and oxygen stable isotope, αU-series, and TIMS U-series.The records of the climate change from stalagmites since 160 000a B.P. can be correlated with the 1 to 6 stages of that from the ocean. The time of the beginning and ending points of the last glaciation were estimated as(130.1 ±1.0) ka B.P. and (11.2±0.1) ka B.P. The accuracy from the stalagmite record is much higher than that from other record. The results indicates the epochs of Heinrich climate oscillation from stalagmite are H1 14~15 ka B.P., H2 21~23 ka B.P., H3 25~27 ka B.P. and H4 41~42 ka B.P. Furthermore, there was a large cold-event at 35~37 ka B.P. Therefore, the record of last glaciation from stalagmite may well correlate with the record from Greenland ice core.Regarding the existance epochs lagging or surpassing for long-term climate cycle to short-term abrupt climate event, perhaps, these were errors from different test-methods and test-objects (including test-error). If there would be more evidences, the epochs of some climate abrupt events in the global change could be confirmed to be in the same time. The dynamic mechanism of the short-term abrupt event might attribute to the astronomical factors as long-term climate cycle. However, the astronomical factors, which influenced the short-term abrupt climate event, cannot be recognized at present.%全球变化研究是当今地球科学最前沿的课题。要了解地球系统长期演变的动力过程,预测未来气候变化,就必须首先研究和重建最后2

  12. Patterns of millennial variability over the last 500 ka

    Directory of Open Access Journals (Sweden)

    M. Siddall

    2010-05-01

    Full Text Available Millennial variability is a robust feature of many paleoclimate records, at least throughout the last several glacial cycles. Here we use the mean signal from Antarctic climate events 1 to 4 to probe the EPICA Dome C temperature proxy reconstruction through the last 500 ka for similar millennial-scale events. We find that clusters of millennial events occurred in a regular fashion over half of the time during this with a mean recurrence interval of 21 kyr. We find that there is no consistent link between ice-rafted debris deposition and millennial variability. Instead we speculate that changes in the zonality of atmospheric circulation over the North Atlantic form a viable alternative to freshwater release from icebergs as a trigger for millennial variability. We suggest that millennial changes in the zonality of atmospheric circulation over the North Atlantic are linked to precession via sea-ice feedbacks and that this relationship is modified by the presence of the large, Northern Hemisphere ice sheets during glacial periods.

  13. Lake-Level Responses to Abrupt Climate Changes in North-Central Pennsylvania since >16 ka

    Science.gov (United States)

    Halstead, T. M.; Shuman, B. N.

    2016-12-01

    Water levels in small lakes and ponds have widely responded to late-Quaternary climate changes, and we use a combination of geophysical surveys and sediment cores to reconstruct the hydrologic history of Sunfish Pond near Leroy, Pennsylvania (41°38'N 76°41'W). The small lake sits atop Barclay Mountain, a narrow ridge of the Appalachian Mountains near the southern limit of the Wisconsin glaciation. Ground-penetrating radar (GPR) profiles and a transect of three sediment cores indicate that the shoreline position of the lake has shifted over time with sandy littoral sediments extending outward into the lake stratigraphy, which is primarily composed of organic-rich muds. Calibrated radiocarbon ages from a sediment core collected in 2.25 m of water indicate that the lake formed by ca. 16.1 ka. Deposition of organic-rich muds in the near-shore core indicates moderately high water levels during the period of Heinrich Event 1, the Younger Dryas, and portions of the early Holocene. Sand layers and exceptionally low sediment accumulation rates indicate low water, however, from <16-12.5 ka and again from 5.5-2.8 ka. The water level has been near its modern high level since 2.8 ka based on extensive deposition of rapidly accumulating, organic-rich muds across the basin. The changes coincide with major changes in regional pollen records, and confirm the hydrologic significance of late-Pleistocene abrupt events in the Mid-Atlantic region.

  14. Språka och lek

    DEFF Research Database (Denmark)

    Bylander, Helle Iben; Thomsen, Inge Benn

    Språka och Lek innehåller mer än 100 språklekar och idéer. Bokens aktiviteter är noggrant beskrivna med tydliga mål och anvisningar, så att den pedagogiska personalen i förskolan kan erbjuda spännande och värdefulla språkliga upplevelser med hjälp av vardagsföremål och massor av fantasi. Boken är...

  15. Ka-band waveguide rotary joint

    KAUST Repository

    Yevdokymov, Anatoliy

    2013-04-11

    The authors present a design of a waveguide rotary joint operating in Ka-band with central frequency of 33 GHz, which also acts as an antenna mount. The main unit consists of two flanges with a clearance between them; one of the flanges has three circular choke grooves. Utilisation of three choke grooves allows larger operating clearance. Two prototypes of the rotary joint have been manufactured and experimentally studied. The observed loss is from 0.4 to 0.8 dB in 1.5 GHz band.

  16. The 13 ka Pelée-Type Dome Collapse at Nevado de Toluca Volcano, México.

    Science.gov (United States)

    D'Antonio, M.; Capra, L.; Sarocchi, D.; Bellotti, F.

    2007-05-01

    The Nevado de Toluca is an active volcano located in the central sector of the Trans-Mexican Volcanic Belt, 80 km southwest of Mexico City. Activity at this andesitic to dacitic stratovolcano began ca. 2.6 Ma ago. During the last 42 ka, the volcano has been characterized by different eruptive styles, including five dome collapses dated at 37, 32, 28, 26, and 13 ka and five Plinian eruptions at 42 ka, 36 ka, 21.7 ka, 12.1 ka and 10.5 ka. The 13 ka dome collapse is the youngest event of this type, and originated a 0.11 km3 block-and-ash flow deposit on the north-eastern sector of the volcano. The deposit consists of two facies: channel-like, 10 m thick, monolitologic, that is composed of up to five units, with decimetric dacitic clasts set in a sandy matrix; and a lateral facies that consists of a gray, sandy horizon, up to 4 m thick, with a 30 cm-thick surge layer at the base. The main component is a dacitic lava, with different degree of vesciculation, with mineral association of Pl-Hbl-Opx. Plagioclases show two different textures: in equilibrium, with normal zoning (core = An37-64.3, rim = An30.7-45.8) or with spongy cellular texture with inverse zoning (core = An38-43.5, rim = An45-51.2). Hornblende is normally light green, barren of oxidation. The rock matrix contains up to 53 perc. of glass with abundant microlites, indicating over-pressure on the crystallizing magma and a rapid expulsion. All these stratigraphic and petrographic features indicate that the dome was quickly extruded on the summit of the volcano, probably triggered by a magma mixing process, and its collapse was accompanied by an explosive component, being classified as a Pelée-type event.

  17. Paleomagnetism and Mineralogy of Unusual Silicate Glasses and Baked Soils on the Surface of the Atacama Desert of Northern Chile: A Major Airburst Impact ~12ka ago?.

    Science.gov (United States)

    Roperch, P. J.; Blanco, N.; Valenzuela, M.; Gattacceca, J.; Devouard, B.; Lorand, J. P.; Tomlinson, A. J.; Arriagada, C.; Rochette, P.

    2015-12-01

    Unusual silicate glasses were found in northern Chile in one of the driest place on earth, the Atacama Desert. The scoria-type melted rocks are littered on the ground at several localities distributed along a longitudinal band of about 50km. The silicate glasses have a stable natural remanent magnetization carried by fine-grained magnetite and acquired during cooling. At one locality, fine-grained overbank sediments were heated to form a 10 to 20 cm-thick layer of brick-type samples. Magnetic experiments on oriented samples demonstrate that the baked clays record a thermoremanent magnetization acquired in situ above 600°C down to more than 10cm depth and cooled under a normal polarity geomagnetic field with a paleointensity of 40μT. In some samples of the silicate glass, large grains of iron sulphides (troilite) are found in the glass matrix with numerous droplets of native iron, iron sulphides and iron phosphides indicating high temperature and strong redox conditions during melting. The paleomagnetic record of the baked clays and the unusual mineralogy of the silicate glasses indicate a formation mainly by in situ high temperature radiation. Paleomagnetic experiments and chemical analyses indicate that the silicate glasses are not fulgurite type rocks due to lightning events, nor volcanic glasses or even metallurgical slags related to mining activity. The existence of a well-developped baked clay layer indicates that the silicate glasses are not impact-related ejectas. The field, paleomagnetic and mineralogical observations support evidence for a thermal event likely related to a major airburst. The youngest calibrated 14C age on a charcoal sample closely associated with the glass indicates that the thermal event occurred around 12 to 13 ka BP. The good conservation of the surface effects of this thermal event in the Atacama Desert could provide a good opportunity to further estimate the threats posed by large asteroid airbursts.

  18. Proxy benchmarks for intercomparison of 8.2 ka simulations

    Directory of Open Access Journals (Sweden)

    C. Morrill

    2012-08-01

    Full Text Available The Paleoclimate Modelling Intercomparison Project (PMIP3 now includes the 8.2 ka event as a test of model sensitivity to North Atlantic freshwater forcing. To provide benchmarks for intercomparison, we compiled and analyzed high-resolution records spanning this event. Two previously-described anomaly patterns that emerge are cooling around the North Atlantic and drier conditions in the Northern Hemisphere tropics. Newer to this compilation are more robustly-defined wetter conditions in the Southern Hemisphere tropics and regionally-limited warming in the Southern Hemisphere. Most anomalies around the globe lasted on the order of 100 to 150 yr. More quantitative reconstructions are now available and indicate cooling of 1.0 to 1.2 °C and a ~20% decrease in precipitation in parts of Europe, as well as spatial gradients in δ18O from the high to low latitudes. Unresolved questions remain about the seasonality of the climate response to freshwater forcing and the extent to which the bipolar seesaw operated in the early Holocene.

  19. Application of genetic BP network to discriminating earthquakes and explosions

    Institute of Scientific and Technical Information of China (English)

    边银菊

    2002-01-01

    In this paper, we develop GA-BP algorithm by combining genetic algorithm (GA) with back propagation (BP) algorithm and establish genetic BP neural network. We also applied BP neural network based on BP algorithm and genetic BP neural network based on GA-BP algorithm to discriminate earthquakes and explosions. The obtained result shows that the discriminating performance of genetic BP network is slightly better than that of BP network.

  20. Origin and fate of sedimentary organic matter in the northern Bay of Bengal during the last 18 ka

    Science.gov (United States)

    Contreras-Rosales, L. A.; Schefuß, E.; Meyer, V.; Palamenghi, L.; Lückge, A.; Jennerjahn, T. C.

    2016-11-01

    The Northern Bay of Bengal (NBoB) is a globally important region for deep-sea organic matter (OM) deposition due to massive fluvial discharge from the Ganges-Brahmaputra-Meghna (G-B-M) rivers and moderate to high surface productivity. Previous studies have focused on carbon burial in turbiditic sediments of the Bengal Fan. However, little is known about the storage of carbon in pelagic and hemipelagic sediments of the Bay of Bengal over millennial time scales. This study presents a comprehensive history of OM origin and fate as well as a quantification of carbon sediment storage in the Eastern Bengal Slope (EBS) during the last 18 ka. Bulk organic proxies (TOC, TIC, TN, δ13CTOC, δ15NTN) and content and composition of total hydrolysable amino acids (THAA) in a sediment core (SO188-342KL) from the EBS were analyzed. Three periods of high OM accumulation were identified: the Late Glacial (LG), the Bölling/Alleröd (B/A), and the Early Holocene Climatic Optimum (EHCO). Lower eustatic sea level before 15 ka BP allowed a closer connection between the EBS and the fluvial debouch, favoring high terrestrial OM input to the core site. This connection was progressively lost between 15 and 7 ka BP as sea level rose to its present height and terrestrial OM input decreased considerably. Export and preservation of marine OM was stimulated during periods of summer monsoon intensification (B/A and EHCO) as a consequence of higher surface productivity enhanced by cyclonic-eddy nutrient pumping and fluvial nutrient delivery into the photic zone. Changes in the THAA composition indicate that the marine plankton community structure shifted from calcareous-dominated before 13 ka BP to siliceous-dominated afterwards. They also indicate that the relative proportion of marine versus terrestrial OM deposited at site 342KL was primarily driven by relative sea level and enlarged during the Holocene. The ballasting effect of lithogenic particles during periods of high coastal proximity and

  1. High Efficiency Ka-Band Spatial Combiner

    Directory of Open Access Journals (Sweden)

    D. Passi

    2014-12-01

    Full Text Available A Ka-Band, High Efficiency, Small Size Spatial Combiner (SPC is proposed in this paper, which uses an innovatively matched quadruple Fin Lines to microstrip (FLuS transitions. At the date of this paper and at the Author's best knowledge no such FLuS innovative transitions have been reported in literature before. These transitions are inserted into a WR28 waveguide T-junction, in order to allow the integration of 16 Monolithic Microwave Integrated Circuit (MMIC Solid State Power Amplifiers (SSPA's. A computational electromagnetic model using the finite elements method has been implemented. A mean insertion loss of 2 dB is achieved with a return loss better the 10 dB in the 31-37 GHz bandwidth.

  2. p Ka calculation of poliprotic acid: histamine

    Science.gov (United States)

    De Abreu, Heitor A.; De Almeida, Wagner B.; Duarte, Hélio A.

    2004-01-01

    Various theoretical studies have been reported addressing the performance of solvation models available to estimate p Ka values. However, no attention has been paid so far to the role played by the electronic, thermal and solvation energy individual contributions to the Gibbs free energy of the deprotonation process. In this work, we decompose the total Gibbs free energy into three distinct terms and then evaluate the dependence of each contribution on the level of theory employed for its determination using different levels of theory. The three possible p Kas of histamine have been estimated and compared with available experimental data. We found that the electronic energy term is sensitive to the level of theory and basis set, and, therefore, could be also a source of error in the theoretical calculation of p Kas.

  3. KaKa带你杀大网

    Institute of Scientific and Technical Information of China (English)

    昊月

    2005-01-01

    前两期的Dust2和Inferno相信大家杀得一定很过瘾吧?这期KaKa继续向大家介绍杀大网的奥妙,这次我们转战Train这张地图。这张地图的特点是阴人的特点是掩体多、整体的颜色比较暗,可以到处阴人。Train的空间感也比较强,上下移动的频率比较多,所以大家在玩这种地图的时候枪口上下移动会很频繁。对鼠标垫比较好的玩家来说,是比较耗损好的鼠标垫哦,希望大家不要心疼。

  4. Black carbon record of the wildfire history of western Sichuan Province in China over the last 12.8 ka

    Science.gov (United States)

    Sun, Weiwei; Zhang, Enlou; Shen, Ji; Chen, Rong; Liu, Enfeng

    2016-01-01

    Wildfire is recognized as a critical Earth system process which affects the global carbon cycle, atmospheric chemistry, and ecosystem dynamics. Estimating the potential impact of future climate change on the incidence of fire requires an understanding of the long-term interactions of fire, climate, vegetation, and human activity. Accordingly, we analyzed the black carbon content and the pollen stratigraphy of sediments spanning the past 12.8 ka from Lake Muge Co, an alpine lake in western Sichuan Province, in order to determine the main factors influencing regional fire regimes. The results demonstrate that wildfires occurred frequently and intensively during the late deglaciation and the early Holocene when the regional vegetation was dominated by deciduous forests. Wildfire occurrence decreased significantly during the Holocene climatic optimum between 9.2 and 5.6 cal ka BP. Overall, the wildfire history of western Sichuan Province is similar to that of the Chinese Loess Plateau and of East Asia as a whole, suggesting that regional-scale fires depended mainly on changes in the intensity of the Asian summer monsoon. In addition, the fire regime of western Sichuan Province may have been influenced by the establishment of human settlement and agriculture in western Sichuan Province and the southeastern Tibetan Plateau after about 5.5 cal ka BP, and by an intensification of cereal cultivation coupled with population expansion in southwestern China during the last two millennia.

  5. Oceanic Density Fronts Steering Bottom-Current Induced Sedimentation Deduced from a 50 ka Contourite-Drift Record and Numerical Modeling (off NW Spain)

    Science.gov (United States)

    Hanebuth, T. J. J.; Zhang, W.; Hofmann, A. L.; Lowemark, L. A.; Schwenk, T.

    2015-12-01

    How bottom-near hydrographic and sedimentary processes control the formation of bottom-current related confined deep-sea depocenters remains widely speculative. The geological approach of this study uses a transect of sediment cores and sediment echosounder profiles across a whole contourite system off NW Spain. This "mounded patch"-type contourite drift (18 km long, 20 km wide) with a 150-m deep moat has formed around an 800-m high structural obstacle. Past deposition was characterized by alternating calm and high-energy bottom-flow conditions. Calm conditions (Last Glacial period: 27-17 cal ka BP; late Holocene times: current-influenced deposition of fine-grained sediments (10 µm) over the entire basin. In contrast, waxing-and-waning high-energy conditions (D/O events during Marine Isotope Stage 3; the Deglacial/early Holocene time interval at 17-4 cal ka BP) resulted in coarse grained (70 µm) deposition. Process-based numerical modelling demonstrates that pulse-like oceanic density fronts travelling within the transition zone of two water masses (Labrador Sea Water, Mediterranean Outflow Water) provide a powerful mechanism for contouritic deposition, rather than the core of a water mass itself. These gravity-driven density fronts lead to local re-suspension of sand from the moat and to subsequent upward transport over the crest. Here, the oceanic density fronts produce additional km-scale eddies. These migrating eddies provide an efficient mechanism for further widespread sediment re-distribution. In comparison with paleoceanographic reconstructions, a downward migration or expansion of the Mediterranean Outflow Water by about 300 m led most probably to such temporary contouritic sand deposition. We finally propose a conceptual model to explain how seafloor obstacles redirect and perturbate bottom currents. This model proposes water mass transition zone as an important high-energy medium, for oceanic density fronts to travel. On the respective time scale, the

  6. Aeronautical applications of steerable K/Ka-band antennas

    Science.gov (United States)

    Helmken, Henry; Prather, Horton

    1995-01-01

    The expected growth of wideband data and video transmission via satellite will press existing satellite Ku-band services and push development of the Ka-band region. Isolated ground based K/Ka-band terminals can experience severe fading due to rain and weather phenomena. However, since aircraft generally fly above the severe weather, they are attractive platforms for developing commercial K/Ka-band communication links.

  7. A high-resolution lake sediment record of glacier activity from SE Greenland defines abrupt Holocene cooling events

    Science.gov (United States)

    Balascio, N. L.; Bradley, R. S.; D'Andrea, W. J.

    2013-12-01

    Orbital driven changes in high latitude summer insolation during the Holocene are responsible for the primary millennial-scale climate trends in the Arctic. Following deglaciation, maximum summer temperatures generally occurred during the early to mid-Holocene and declined through the late Holocene. Superimposed on this gradual cooling trend are centennial- and decadal-scale intervals that indicate more rapid perturbations of the arctic climate system. Highly resolved sedimentary records from terrestrial and marine sites help to better characterize climate system dynamics during the Holocene and investigate forcing and feedback mechanism that operate on different timescales. Reconstructing glacial activity can provide valuable paleoclimate information about trends in summer temperature and/or winter precipitation. Proglacial lakes contain sediment archives of meltwater input from glaciers and typically have high sedimentation rates preserving detailed information on glacial activity. However, interpreting proglacial sedimentary records can be difficult because 1) there may be significant input of sediment from non-glacial sources, 2) there is often a lack of organic material for radiocarbon dating, and 3) not all glaciers are sensitive to rapid climatic changes. Here we present a c. 10 cal ka BP record of glacier activity from Kulusuk Lake (65.6°N, 37.1°W; 202 m a.s.l.), a proglacial lake in southeast Greenland that is well constrained by radiocarbon dates and shows a clear signal of changes in glacial input throughout the Holocene. Kulusuk Lake is presently fed by meltwater from two cirque glaciers. It has a small catchment and no other significant source of sediment input. A 3.5 m sediment core contains distinct lithologic changes defined by grain size, magnetic susceptibility, organic content, and scanning XRF data. During the early Holocene, an overall decrease in meltwater input from 8.7-7.7 ka indicates the retreat of the glaciers in response to regional

  8. Carbon isotope (δ13C) excursions suggest times of major methane release during the last 14 ka in Fram Strait, the deep-water gateway to the Arctic

    Science.gov (United States)

    Consolaro, C.; Rasmussen, T. L.; Panieri, G.; Mienert, J.; Bünz, S.; Sztybor, K.

    2014-10-01

    We present results from a sediment core collected from a pockmark field on the Vestnesa Ridge (∼80° N) in the eastern Fram Strait. This is the only deep-water gateway to the Arctic, and one of the northernmost marine gas hydrate provinces in the world. Eight 14C AMS dating reveals a detailed chronology for the last 14 ka BP. The δ13C record measured on the benthic foraminiferal species Cassidulina neoteretis shows two distinct intervals with negative values, as low as -4.37‰ in the Bølling-Allerød interstadials and as low as -3.41‰ in the early Holocene. After cleaning procedure designed to remove all authigenic carbonate coatings on benthic foraminiferal tests, the 13C values are still negative (as low as -2.75‰). We have interpreted these negative carbon isotope excursions (CIEs) to record past methane release events, resulting from the incorporation of 13C-depleted carbon from methane emissions into the benthic foraminiferal shells. The CIEs during the Bølling-Allerød interstadials and the early Holocene relate to periods of ocean warming, sea level rise and increased concentrations of methane (CH4) in the atmosphere. CIEs with similar timing have been reported from other areas in the North Atlantic suggesting a regional event. The trigger mechanisms for such regional events remain to be determined. We speculate that sea-level rise and seabed loading due to high sediment supply in combination with increased seismic activity as a result of rapid deglaciation may have triggered the escape of significant amounts of methane to the seafloor and the water column above.

  9. Pollen-inferred vegetation and environmental changes in the central Tibetan Plateau since 8200 yr BP

    Institute of Scientific and Technical Information of China (English)

    LIU; Kam-Biu; Carrie; MORRILL; Jonathan; T.; OVERPECK; Julia; E.; COLE

    2009-01-01

    The ecotone between alpine steppe and meadow in the central Tibetan Plateau is sensitive to climate changes. Here we used the pollen records from three lakes in this region to reconstruct the evolution of local vegetation and climate since 8200 cal. yr BP. The history of temperature and precipitation was reconstructed quantitatively with multi-bioclimatic indexes and a transfer function from pollen records. Results show that the steppe/meadow dominated during the period of 8200―6500 cal. yr BP, especially 8200―7200 cal. yr BP, indicating the central Tibetan Plateau was controlled by strong monsoon. The steppe dominated during the periods of 6000―4900, 4400―3900, and 2800―2400 cal. yr BP. The steppe decreased gradually and the meadow expanded during the period of 4900―4400 cal. yr BP. Three century-scale drought events occurred during 5800―4900, 4400―3900 and 2800 cal. yr BP, respectively. The first time when the regional climate shifted to the present level was at 6500 cal. yr BP in the central Plateau. Since 3000 cal. yr BP, the temperature and precipitation have decreased gradually to the present level. However, the cold climate between 700―300 cal. yr BP likely corresponds to the Little Ice Age.

  10. Pollen-inferred vegetation and environmental changes in the central Tibetan Plateau since 8200 yr BP

    Institute of Scientific and Technical Information of China (English)

    TANG LingYu; SHEN CaiMing; LI ChunHai; PENG JinLan; LIU Hui; LIU Kam-Biu; Carrie MORRILL; Jonathan T. OVERPECK; Julia E. COLE; YANG Bao

    2009-01-01

    The ecotone between alpine steppe and meadow in the central Tibetan Plateau is sensitive to climate changes. Here we used the pollen records from three lakes in this region to reconstruct the evolution of local vegetation and climate since 8200 cal. Yr BP. The history of temperature and precipitation was reconstructed quantitatively with multi-bioclimatic indexes and a transfer function from pollen records.Results show that the steppe/meadow dominated during the period of 8200-6500 cal. Yr BP, especially 8200-7200 cal. Yr BP, indicating the central Tibetan Plateau was controlled by strong monsoon. The steppe dominated during the periods of 6000--4900, 4400--3900, and 2800--2400 cal. Yr BP. The steppe decreased gradually and the meadow expended during the period of 4900-4400 cal. Yr BP. Three century-scale drought events occurred during 5800-4900, 4400-3900 and 2800 cal. Yr BP, respectively. The first time when the regional climate shifted to the present level was at 6500 cal. Yr BP in the central Plateau. Since 3000 cal. Yr BP, the temperature and precipitation have decreased gradually to the present level. However, the cold climate between 700--300 cal. Yr BP likely corresponds to the Little ice Age.

  11. Palaeo-lakes and palaeo-climates in the circum western Indian ocean since 25 ka BP; Paleolacs et paleoclimats aux pourtours de l`ocean Indien occidental depuis 25 ka BP

    Energy Technology Data Exchange (ETDEWEB)

    Gasse, F.; Bergonzini, L.; Chalie, F.; Gibert, E.; Massault, M. [Paris-11 Univ., 91 - Orsay (France). Laboratoire d`Hydrologie et de Geochimie Isotopique; Melieres, F. [Centre National de la Recherche Scientifique (CNRS), 75 - Paris (France). Laboratoire de Geologie, MNHN

    1998-12-31

    Several lacustrine records from tropical regions of both Hemisphere (Tibet, Ethiopia, Tanganyika, Madagascar) illustrate the specificity of regional response to changes in the major forcing factors of the global climate system. Methodology and techniques are first briefly described. We then summarize major environmental changes recorded in the four regions considered. Hydro-climatic variations are partly explained by insolation forcing. All sites register a mean annual hydrological deficit during the Last Glacial Maximum, as expected from orbital forcing in the Northern Hemisphere, but not in he southern Hemisphere. Glacial climatic boundary conditions, i.e. lower tropical sea surface temperature and related availability in atmospheric moisture should be considered as the major cause. Other mechanisms have to be searched to account for short-term post-glacial variations that affect large geographical areas. (authors) 74 refs.

  12. DARHT 2 kA Cathode Development

    Energy Technology Data Exchange (ETDEWEB)

    Henestroza, E.; Houck, T.; Kwan, J.W.; Leitner, M.; Miram, G.; Prichard, B.; Roy, P.K.; Waldron, W.; Westenskow, G.; Yu, S.; Bieniosek, F.M.

    2009-03-09

    In the campaign to achieve 2 kA of electron beam current, we have made several changes to the DARHT-II injector during 2006-2007. These changes resulted in a significant increase in the beam current, achieving the 2 kA milestone. Until recently (before 2007), the maximum beam current that was produced from the 6.5-inch diameter (612M) cathode was about 1300 A when the cathode was operating at a maximum temperature of 1140 C. At this temperature level, the heat loss was dominated by radiation which is proportional to temperature to the fourth power. The maximum operating temperature was limited by the damage threshold of the potted filament and the capacity of the filament heater power supply, as well as the shortening of the cathode life time. There were also signs of overheating at other components in the cathode assembly. Thus it was clear that our approach to increase beam current could not be simply trying to run at a higher temperature and the preferred way was to operate with a cathode that has a lower work function. The dispenser cathode initially used was the type 612M made by SpectraMat. According to the manufacturer's bulletin, this cathode should be able to produce more than 10 A/cm{sup 2} of current density (corresponding to 2 kA of total beam current) at our operating conditions. Instead the measured emission (space charge limited) was 6 A/cm{sup 2}. The result was similar even after we had revised the activation and handling procedures to adhere more closely to the recommend steps (taking longer time and nonstop to do the out-gassing). Vacuum was a major concern in considering the cathode's performance. Although the vacuum gauges at the injector vessel indicated 10{sup -8} Torr, the actual vacuum condition near the cathode in the central region of the vessel, where there might be significant out-gassing from the heater region, was never determined. Poor vacuum at the surface of the cathode degraded the emission (by raising the work function

  13. AcEST: BP914941 [AcEST

    Lifescience Database Archive (English)

    Full Text Available ive uncharacterized protein OS=Oryza... 55 2e-06 tr|Q84KA5|Q84KA5_CUCME Selenium binding protein-like protei...007 >tr|Q84KA5|Q84KA5_CUCME Selenium binding protein-like protein OS=Cucumis melo GN=Sbp1 PE=4 SV=1 Length =

  14. Briti korruptsioonivastane seadus kehtib ka Eestis / Tõnis Tamme

    Index Scriptorium Estoniae

    Tamme, Tõnis, 1972-

    2011-01-01

    Suurbritannias jõustub 1. juulil 2011 uus korruptsioonivastane seadus (Bribery Act 2010), mis kehtib ühtmoodi nii Briti ettevõtetele kui ka mujal maailmas asutatud äriühingutele, kelle äritegevus või ka osa sellest omab puutumust Suurbritanniaga

  15. Assigning the pKa's of Polyprotic Acids.

    Science.gov (United States)

    Bodner, George M.

    1986-01-01

    Discusses (1) polyproptic acids for which the difference between K-a's is large; (2) the Henderson-Hasselbach equation; (3) polyprotic acids for which the difference between K-a's is small; (4) analysis of microscopic dissociation constants for cysteine; and (5) analysis of pK-a data. (JN)

  16. A compilation of Western European terrestrial records 60-8 ka BP: towards an understanding of latitudinal climatic gradients

    NARCIS (Netherlands)

    Moreno, A.; Svensson, A.; Brooks, S.J.; Connors, S.; Engels, S.; Fletcher, W.; Genty, D.; Heiri, O.; Labuhn, I.; Perşoiu, A.; Peyron, O.; Sadori, L.; Valero-Garcés, B.; Wulf, S.; Zanchetta, G; Data contributors, [Unknown

    2014-01-01

    Terrestrial records of past climatic conditions, such as lake sediments and speleothems, provide data of great importance for understanding environmental changes. However, unlike marine and ice core records, terrestrial palaeodata are often not available in databases or in a format that is easily ac

  17. High power Ka band TWT amplifier

    Energy Technology Data Exchange (ETDEWEB)

    Golkowski, C.; Ivers, J.D.; Nation, J.A.; Wang, P.; Schachter, L.

    1999-07-01

    Two high power 35 GHz TWT amplifiers driven by a relativistic pencil, 850 kV, 200A electron beam have been assembled and tested. The first had a dielectric slow wave structure and was primarily used to develop diagnostics, and to gain experience in working with high power systems in Ka band. The source of the input power for the amplifier was a magnetron producing a 30 kW, 200ns long pulse of which 10 kW as delivered to the experiment. The 30 cm long dielectric (Teflon) amplifier produced output power levels of about 1 MW with a gain of about 23 dB. These results are consistent with expectations from PIC code simulations for this arrangement. The second amplifier, which is a single stage disk loaded slow wave structure, has been designed. It consists of one hundred uniform cells with two sets of ten tapered calls at the ends to lower the reflection coefficient. The phase advance per cell is {pi}/2. The amplifier passband extends from 28 to 40 GHz. It is designed to increase the output power to about 20 MW. The amplifier is in construction and will be tested in the near future. Details of the design of both systems will be provided and initial results from the new amplifier presented.

  18. Palaeoenvironmental changes from pollen record in deep sea core PC-1 from northern Okinawa Trough, East China Sea during the past 24 ka

    Institute of Scientific and Technical Information of China (English)

    XU HongYan; CHANG FengMing; LUO YunLi; SUN XiangJun

    2009-01-01

    A pollen record of core PC-1 from the northern Okinawa Trough, East China Sea (ECS), provides in-formation on vegetation and climate changes since 24 cal. kaBP. A total of 103 samples were palyno-logically analyzed at 8 cm intervals with a time resolution of 230 a. Four pollen zones are recognized: zone I (812-715 cm, 24.2-21.1 cal. kaBP), zone II (715-451 cm, 21.1 -15.2 cal. kaBP), zone Ⅲ (451 -251 cm, 15.2-10.8 cal. kaBP), zone Ⅳ (251-0 cm, 10.8-0.3 cal. kaBP), corresponding to Late MIS 3, Last Glacial Maximum (LGM), deglaciation and Holocene, respectively. The LGM is characterized by the dominance of herbs, mainly Artemisia, and high pollen influx, implying an open vegetation on the ex-posed continental shelf and e cool and dry climate. The deglaciation is a climate warming stage with Pinus percentage increased and Artemisia percentage decreased and a rapid sea-level rise. The Holo-cene is characterized by predominance of tree pollen with rapid increase in Castanea-Castanopsis in-dicating the development of mixed evergreen and deciduous broad-leaved forest and a warm, humid climate. Low pollen influx during the Holocene probably implies submergence of the continental shelf and retreat of the pollen source area. The vegetation indicated by pollen assemblage found in this up-per zone is consistent with the present vegetation found in Kyushu, Japan. Originating from the humid mountain area of North Luzon of the Philippines, Tasmania and New Zealand, Phyllocladus with spo-radic occurrence throughout PC-1 core probably suggests the influence of Palaeo-Kuroshio Current or intense summer monsoon. The observed changes in Pinus and Herbs percentage indicate fluctuations of the sea level, and high Pinus percentage corresponds to high sea level. Spectrum analysis of the pollen percentage record reveals many millennial-scale periodicities, such as periodicities of 6.8, 3.8, 2.2, 1.6 ka.

  19. Eruptive history of Sundoro volcano, Central Java, Indonesia since 34 ka

    Science.gov (United States)

    Prambada, Oktory; Arakawa, Yoji; Ikehata, Kei; Furukawa, Ryuta; Takada, Akira; Wibowo, Haryo Edi; Nakagawa, Mitsuhiro; Kartadinata, M. Nugraha

    2016-11-01

    Reconstruction of the eruptive history of Sundoro volcano is needed to forecast the probability of future eruptions and eruptive volumes. Sundoro volcano is located in Central Java (Indonesia), 65 km northwest of Yogyakarta, and in one of the most densely populated areas of Indonesia. On the basis of stratigraphy, radiocarbon dating, petrography, and whole-rock geochemistry, we recognize the following 12 eruptive groups: (1) Ngadirejo, (2) Bansari, (3) Arum, (4) Kembang, (5) Kekep, (6) Garung, (7) Kertek, (8) Watu, (9) Liyangan, (10) Kledung, (11) Summit, and (12) Sibajak. The Ngadirejo (34 ka BP) to Kledung (1 ka) eruptive groups are inferred to have been the stratovolcano building phase. Based on compositions of deposits, one or more magma reservoirs of intermediate chemical composition are inferred to have existed below the volcano during the periods of time represented by the eruptive groups. SiO2 of juvenile eruptive products ranges from 50 to 63 wt%, and K2O contents range from high K to medium K. The chemical composition and phenocryst content of eruptive products change with time. The lower SiO2 products contain mainly plagioclase, clinopyroxene, and olivine, whereas the more evolved rocks contain plagioclase, clinopyroxene, orthopyroxene, and rare hornblende and olivine. Our work has defined Sundoro's eruptive history for the period 1-34 ka, and this history helps us to forecast future activity. We estimated that the total amount of magma discharged since 34 ka is approximately 4.4 km3. The average eruption rate over this group ranges from 0.14 to 0.17 km3/kyr. The eruption rate and the frequency of individual eruptions indicate that the volcano has been very active since 34 ka, and this activity in combination with our petrological data suggest the presence of one or more magma reservoirs that have been repeatedly filled and then discharged as eruptions have taken place. Our data further suggest that the volume of the crustal reservoir system has

  20. The effects of multiple features of alternatively spliced exons on the KA/KS ratio test

    Directory of Open Access Journals (Sweden)

    Chen Feng-Chi

    2006-05-01

    Full Text Available Abstract Background The evolution of alternatively spliced exons (ASEs is of primary interest because these exons are suggested to be a major source of functional diversity of proteins. Many exon features have been suggested to affect the evolution of ASEs. However, previous studies have relied on the KA/KS ratio test without taking into consideration information sufficiency (i.e., exon length > 75 bp, cross-species divergence > 5% of the studied exons, leading to potentially biased interpretations. Furthermore, which exon feature dominates the results of the KA/KS ratio test and whether multiple exon features have additive effects have remained unexplored. Results In this study, we collect two different datasets for analysis – the ASE dataset (which includes lineage-specific ASEs and conserved ASEs and the ACE dataset (which includes only conserved ASEs. We first show that information sufficiency can significantly affect the interpretation of relationship between exons features and the KA/KS ratio test results. After discarding exons with insufficient information, we use a Boolean method to analyze the relationship between test results and four exon features (namely length, protein domain overlapping, inclusion level, and exonic splicing enhancer (ESE frequency for the ASE dataset. We demonstrate that length and protein domain overlapping are dominant factors, and they have similar impacts on test results of ASEs. In addition, despite the weak impacts of inclusion level and ESE motif frequency when considered individually, combination of these two factors still have minor additive effects on test results. However, the ACE dataset shows a slightly different result in that inclusion level has a marginally significant effect on test results. Lineage-specific ASEs may have contributed to the difference. Overall, in both ASEs and ACEs, protein domain overlapping is the most dominant exon feature while ESE frequency is the weakest one in affecting

  1. Evidence for signiifcant climate impacts in monsoonal Asia at 8.2 ka from multiple proxies and model simulations

    Institute of Scientific and Technical Information of China (English)

    MORRILL Carrie; WAGNER Amy J; OTTO-BLIESNER Bette L; ROSENBLOOM Nan

    2011-01-01

    Given the likelihood of future reductions in the strength of the Atlantic Meridional Overturning Circulation (AMOC), it is important to document how changes in the AMOC have altered climate patterns in the past and to assess the skill of coupled climate models in reproducing these teleconnections. Of past abrupt changes in the AMOC, the 8.2 ka event provides a particularly useful case study because its duration, magnitude of AMOC reduction and background climate state are closest to conditions expected in the future. In this research, we present an expanded proxy synthesis of the 8.2 ka event in monsoonal Asia, including new high-resolution lake and bog records, more sites from the East Asia monsoon region and proxies of winter monsoon strength. We compare proxy evidence with a new simulation of the 8.2 ka event using the Community Climate System Model version 3 (CCSM3) and prescribing North Atlantic freshwater forcing according to the latest reconstructions. We ifnd clear and objectively-determined evidence for 8.2 ka climate anomalies at nearly all of the fourteen proxy sites, emphasizing the strong and widespread impacts of the event in monsoonal Asia during both summer and winter seasons. The model simulation corroborates that these anomalies, described generally as a weakening of the summer monsoon and strengthening of the winter monsoon, were likely caused by a reduction of the AMOC. Examination of regional anomalies in East Asia reveals some spatial heterogeneity, however, that in the model simulation is caused by contraction of the seasonal migration of the subtropical monsoon front. The duration of climate anomalies at 8.2 ka in monsoonal Asia, both in proxy records and the model simulation, generally matches the duration of the event in Greenland ice core δ18O, further supporting a tight connection to the North Atlantic.

  2. BP - bisnis põhjas? / Erik Aru

    Index Scriptorium Estoniae

    Aru, Erik

    2010-01-01

    Seoses Mehhiko lahe naftareostusega ootab BP-d kuni 21 mld. dollari suurune trahv, kahjude hüvitamiseks peab BP müüma osa oma varast. Ekspertide hinnangul tähendavad Mehhiko lahe sündmused suuri muutusi kogu naftaäris

  3. Korsun-Shevchenkivs’ka Offensive of Soviet Troops (January — February 1944

    Directory of Open Access Journals (Sweden)

    Sh. Ramazanov

    2016-07-01

    Full Text Available The author considers one of the many battles of the Second World War, which had a direct bearing on the liberation of Ukraine from German invaders. Analyzes the planning and preparation by the Soviet command Korsun-Shevchenkivs’ka Operation Ukeraine on the Right Bank. Events this operation unfolded mainly in the region of the Dnieper near Kaniv. Consider in detail the conduct of the Soviet offensive and the counterattack of the German command, which sought to rescue the encircled troops. The data of the Soviet and German historians regarding the loss of the German forces during the military operation. The author concludes that, due to implementation of Korsun-Shevchenkivs’ka operations for the Soviet army has opened up new opportunities to further advance and the final liberation of Ukraine from Nazi invaders.

  4. The sensitivity of the Late Saalian (140 ka) and LGM (21 ka) Eurasian ice sheets to sea surface conditions

    Energy Technology Data Exchange (ETDEWEB)

    Colleoni, Florence [Centro Euro-Mediterraneo per i Cambiamenti Climatici, Bologna (Italy); UJF, CNRS, Laboratoire de Glaciologie et Geophysique de l' Environnement, Saint Martin d' Heres Cedex (France); Stockholm University, Department of Geological Sciences, Stockhlom (Sweden); Liakka, Johan [Stockholm University, Department of Meteorology, Stockholm (Sweden); Krinner, Gerhard; Peyaud, Vincent [UJF, CNRS, Laboratoire de Glaciologie et Geophysique de l' Environnement, Saint Martin d' Heres Cedex (France); Jakobsson, Martin [Stockholm University, Department of Geological Sciences, Stockhlom (Sweden); Masina, Simona [Centro Euro-Mediterraneo per i Cambiamenti Climatici, Istituto Nazionale di Geofisica e Vulcanologia, Bologna (Italy)

    2011-08-15

    This work focuses on the Late Saalian (140 ka) Eurasian ice sheets' surface mass balance (SMB) sensitivity to changes in sea surface temperatures (SST). An Atmospheric General Circulation Model (AGCM), forced with two preexisting Last Glacial Maximum (LGM, 21 ka) SST reconstructions, is used to compute climate at 140 and 21 ka (reference glaciation). Contrary to the LGM, the ablation almost stopped at 140 ka due to the climatic cooling effect from the large ice sheet topography. Late Saalian SST are simulated using an AGCM coupled with a mixed layer ocean. Compared to the LGM, these 140 ka SST show an inter-hemispheric asymmetry caused by the larger ice-albedo feedback, cooling climate. The resulting Late Saalian ice sheet SMB is smaller due to the extensive simulated sea ice reducing the precipitation. In conclusion, SST are important for the stability and growth of the Late Saalian Eurasian ice sheet. (orig.)

  5. BP, cardiovascular disease, and death in the Folic Acid for Vascular Outcome Reduction in Transplantation trial.

    Science.gov (United States)

    Carpenter, Myra A; John, Alin; Weir, Matthew R; Smith, Stephen R; Hunsicker, Lawrence; Kasiske, Bertram L; Kusek, John W; Bostom, Andrew; Ivanova, Anastasia; Levey, Andrew S; Solomon, Scott; Pesavento, Todd; Weiner, Daniel E

    2014-07-01

    The optimal BP level in kidney transplant recipients remains uncertain. This post hoc analysis of the Folic Acid for Vascular Outcome Reduction in Transplantation (FAVORIT) trial cohort assessed associations of BP with a pooled cardiovascular disease (CVD) outcome and with all-cause mortality. In 3474 prevalent kidney transplant patients, mean age was 52±9 years, 63% were men, 76% were white, 20% had a history of CVD, 40% had a history of diabetes mellitus, and the median time since transplant was 4.1 years (25th to 75th percentiles, 1.7-7.4); mean systolic BP was 136±20 mmHg and mean diastolic BP was 79±12 mmHg. There were 497 CVD events and 406 deaths. After adjustment for demographic and transplant characteristics and CVD risk factors, each 20-mmHg increase in baseline systolic BP associated with a 32% increase in subsequent CVD risk (hazard ratio [HR], 1.32; 95% confidence interval [95% CI], 1.19 to 1.46) and a 13% increase in mortality risk (HR, 1.13; 95% CI, 1.01 to 1.27). Similarly, after adjustment, at diastolic BP levels70 mmHg, each 10-mmHg decrease in diastolic BP level associated with a 31% increase in CVD risk (HR, 1.31; 95% CI, 1.06 to 1.62) and a 31% increase in mortality risk (HR, 1.31; 95% CI, 1.03 to 1.66). However, at diastolic BP levels>70 mmHg, there was no significant relationship between diastolic BP and outcomes. Higher systolic BP strongly and independently associated with increased risk of CVD and all-cause mortality, without evidence of a J shape, whereas only lower levels of diastolic BP associated with increased risk of CVD and death in this trial.

  6. Initiation of the Mekong River delta at 8 ka: evidence from the sedimentary succession in the Cambodian lowland

    Science.gov (United States)

    Tamura, Toru; Saito, Yoshiki; Sieng, Sotham; Ben, Bunnarin; Kong, Meng; Sim, Im; Choup, Sokuntheara; Akiba, Fumio

    2009-02-01

    Modern deltas are understood to have initiated around 7.5-9 ka in response to the deceleration of sea-level rise. This episode of delta initiation is closely related to the last deglacial meltwater events and eustatic sea-level rises. The initial stage of the Mekong River delta, one of the world's largest deltas, is well recorded in Cambodian lowland sediments. This paper integrates analyses of sedimentary facies, diatom assemblages, and radiocarbon dates for three drill cores from the lowland to demonstrate Holocene sedimentary evolution in relation to sea-level changes. The cores are characterized by a tripartite succession: (1) aggrading flood plain to natural levee and tidal-fluvial channel during the postglacial sea-level rise (10-8.4 ka); (2) aggrading to prograding tidal flats and mangrove forests around and after the maximum flooding of the sea (8.4-6.3 ka); and (3) a prograding fluvial system on the delta plain (6.3 ka to the present). The maximum flooding of the sea occurred at 8.0 ± 0.1 ka, 2000 years before the mid-Holocene sea-level highstand, and tidal flats penetrated up to 20-50 km southeast of Phnom Penh after a period of abrupt ˜5 m sea-level rise at 8.5-8.4 ka. The delta progradation then initiated as a result of the sea-level stillstand at around 8-7.5 ka. Another rapid sea-level rise at 7.5-7 ka allowed thick mangrove peat to be widely deposited in the Cambodian lowland, and the peat accumulation endured until 6.3 ka. Since 6.3 ka, a fluvial system has characterized the delta plain, and the fluvial sediment discharge has contributed to rapid delta progradation. The uppermost part of the sedimentary succession, composed of flood plain to natural-levee sediments, reveals a sudden increase in sediment accumulation over the past 600-1000 years. This increase might reflect an increase in the sediment yield due to human activities in the upper to middle reaches of the Mekong, as with other Asian rivers.

  7. Paleoclimatological and paleoenvironmental records since 4 000 a B.P. in sediments of alpine lakes in Taiwan

    Institute of Scientific and Technical Information of China (English)

    罗建育; 陈镇东

    1997-01-01

    The 3 310-m-high Chia-min Lake records the climatic history since 4 ka B. P. in Taiwan. The warm/wet period before 2.2 ka B.P. seemed to correspond to the later part of the Holocene Megathermal, and the cold/dry period during 0-2/2 ka B. P. corresponded to the Katathermal. Before the termination of the Megathermal, an especially warm and humid segment (2, 2-2. 4 ka B. P. ) emerged. The paleoclimatic records from Yuen-yang and Chi-tsai Lakes support the notion that the Megathermal in Taiwan terminated during 2-2. 3 ka B. P. A warm segment (820-1 320 AD) in the Katathermal could be considered the Medieval Warm Period. The climate turned cold and dry after 1 320 AD and this indicated the onset of the Little Ice Age. These paleoclimatic variations are also in good agreement with those recorded in Great Ghost Lake.

  8. NASA SCaN Overview and Ka-Band Actvities

    Science.gov (United States)

    Stegeman, James D.; Midon, Marco Mario; Davarian, Faramaz; Geldzahler, Barry

    2014-01-01

    The Ka- and Broadband Communications Conference is an international forum attended by worldwide experts in the area of Ka-Band Propagation and satellite communications. Since its inception, NASA has taken the initiative of organizing and leading technical sections on RF Propagation and satellite communications, solidifying its worldwide leadership in the aforementioned areas. Consequently, participation in this conference through the contributions described below will maintain NASA leadership in Ka- and above RF Propagation as it relates to enhancing current and future satellite communication systems supporting space exploration.

  9. Onboard Interferometric SAR Processor for the Ka-Band Radar Interferometer (KaRIn)

    Science.gov (United States)

    Esteban-Fernandez, Daniel; Rodriquez, Ernesto; Peral, Eva; Clark, Duane I.; Wu, Xiaoqing

    2011-01-01

    An interferometric synthetic aperture radar (SAR) onboard processor concept and algorithm has been developed for the Ka-band radar interferometer (KaRIn) instrument on the Surface and Ocean Topography (SWOT) mission. This is a mission- critical subsystem that will perform interferometric SAR processing and multi-look averaging over the oceans to decrease the data rate by three orders of magnitude, and therefore enable the downlink of the radar data to the ground. The onboard processor performs demodulation, range compression, coregistration, and re-sampling, and forms nine azimuth squinted beams. For each of them, an interferogram is generated, including common-band spectral filtering to improve correlation, followed by averaging to the final 1 1-km ground resolution pixel. The onboard processor has been prototyped on a custom FPGA-based cPCI board, which will be part of the radar s digital subsystem. The level of complexity of this technology, dictated by the implementation of interferometric SAR processing at high resolution, the extremely tight level of accuracy required, and its implementation on FPGAs are unprecedented at the time of this reporting for an onboard processor for flight applications.

  10. Interoperability of wearable cuffless BP measuring devices.

    Science.gov (United States)

    Liu, Jing; Zhang, Yuan-Ting

    2014-01-01

    While a traditional cuff-based Blood Pressure (BP) measuring device can only take a snap shot of BP, real-time and continuous measurement of BP without an occluding cuff is preferred which usually use the pulse transit time (PTT) in combination with other physiological parameters to estimate or track BP over a certain period of time after an initial calibration. This article discusses some perspectives of interoperability of wearable medical devices, based on IEEE P1708 draft standard that focuses on the objective performance evaluation of wearable cuffless BP measuring devices. The ISO/IEEE 11073 family of standards, supporting the plug-and play feature, is intended to enable medical devices to interconnect and interoperate with other medical devices and with computerized healthcare information systems in a manner suitable for the clinical environment. In this paper, the possible adoption of ISO/IEEE 11073 for the interoperability of wearable cuffless BP devices is proposed. In the consideration of the difference of the continuous and cuffless BP measuring methods from the conventional ones, the existing device specialization standards of ISO/IEEE 11073 cannot be directly followed when designing the cuffless BP device. Specifically, this paper discusses how the domain information model (DIM), in which vital sign information is abstracted as objects, is used to structure the information about the device and that generated from the device. Though attention should also be paid to adopt the communication standards for other parts for the communication system, applying communication standards that enable plug-and-play feature allows achieving the interoperability of different cuffless BP measuring devices with possible different configurations.

  11. Quaternary sediment dynamics in the Belgica mound province, Porcupine Seabight: ice-rafting events and contour current processes

    Science.gov (United States)

    van Rooij, D.; Blamart, D.; Richter, T.; Wheeler, A.; Kozachenko, M.; Henriet, J.-P.

    2007-02-01

    The Belgica cold-water coral banks on the eastern slope of the Porcupine Seabight are closely associated with bottom currents. In order to better understand the local temporal and spatial characteristics, as well as the palaeoclimatologic influences, a 26 m long core, taken on a small contourite drift, was studied. This sediment record of approximately 100 ka BP reveals new insights into the regional glacial and sedimentary processes, which are intrinsically linked to several geological, climatological, biological and hydrodynamic variables. The glacial sequences in the core contain six ice-rafting events (IRE). They are comparable with the North Atlantic Heinrich Events, although their characteristics show dominant influences from the proximal British-Irish Ice Sheet (BIIS). These IRE have a low magnetic susceptibility and are deposited during two or three ice-rafting pulses. The record of ice-rafting suggests a millennial-scaled BIIS destabilisation and confirms the start of a final retreat about 25 ka ago. Additionally, the glacial sequence corresponds to a muddy contourite, influenced by bottom-current strength variations during interstadials, possibly triggered by sporadic reintroductions of Mediterranean Outflow Water in a glacial North Atlantic Ocean. The interglacial sequence features an 11-m thick deep-water massive sand unit, probably deposited under a high-energy bottom-current regime.

  12. Under tõi kirjanduse juurde ka Ilvese / Jaanus Kulli

    Index Scriptorium Estoniae

    Kulli, Jaanus, 1955-

    2009-01-01

    Sirje Kiini raamatust "Marie Under : elu, luuletaja identiteet ja teoste vastuvõtt" (Tallinn : Tänapäev, 2009), mille esitlus toimus 10. dets. Kirjanike Majas Tallinnas. Sõnavõtuga esines ka president Toomas Hendrik Ilves

  13. NOAA Ship Ka'imimoana Underway Meteorological Data, Quality Controlled

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA Ship Ka'imimoana Underway Meteorological Data (delayed ~10 days for quality control) are from the Shipboard Automated Meteorological and Oceanographic System...

  14. Key Science Observations of AGNs with KaVA Array

    CERN Document Server

    Kino, Motoki; Zhao, Guang-Yao; Sohn, Bong Won

    2015-01-01

    KaVA (KVN and VERA Array) is a new combined VLBI array with KVN (Korean VLBI Network) and VERA (VLBI Exploration of Radio Astrometry). First, we briefly review the imaging capabilities of KaVA array which actually achieves more than three times better dynamic range than that achieved by VERA alone. The KaVA images clearly show detailed structures of extended radio jets in AGNs. Next, we represent the key science program to be led by KaVA AGN sub working group. We will conduct the monitoring observations of Sgr A* and M87 because of the largeness of their central super-massive black hole angular sizes. The main science goals of the program are (i) testing magnetically-driven-jet paradigm by mapping velocity fields of the M87 jet, and (ii) obtaining tight constraints on physical properties of radio emitting region in Sgr A*.

  15. Autorid ja esitajad tahavad maksu ka mobiiltelefonidelt / Teele Tammeorg

    Index Scriptorium Estoniae

    Tammeorg, Teele

    2010-01-01

    Esitajate liidu arvates tuleks maksu alla minevate seadmete hulka arvata ka blu-ray plaadid, MP3-mängijad ja pleieriga mobiiltelefonid, millel on mälumahtu üle 128 MB. Elisa pressiesindaja Marika Raiski arvamus

  16. Rahvasaadik Pikhof toetab nii Tiibetit kui ka Hiinat / Mirko Ojakivi

    Index Scriptorium Estoniae

    Ojakivi, Mirko

    2007-01-01

    Riigikogu liige Heljo Pikhof on kirjas nii Riigikogu Tiibeti toetusrühmas kui ka Hiina parlamendirühmas, samuti Taiwani toetusrühmas. TÜ sinoloogiateaduri Märt Läänemetsa arvamus, H. Pikhofi selgitus

  17. Ka-Band MMIC T/R Module Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This proposal is specifically written to address the need for improved Ka-band T/R modules. The solicitation calls for investigation and development of core...

  18. Under tõi kirjanduse juurde ka Ilvese / Jaanus Kulli

    Index Scriptorium Estoniae

    Kulli, Jaanus, 1955-

    2009-01-01

    Sirje Kiini raamatust "Marie Under : elu, luuletaja identiteet ja teoste vastuvõtt" (Tallinn : Tänapäev, 2009), mille esitlus toimus 10. dets. Kirjanike Majas Tallinnas. Sõnavõtuga esines ka president Toomas Hendrik Ilves

  19. Autorid ja esitajad tahavad maksu ka mobiiltelefonidelt / Teele Tammeorg

    Index Scriptorium Estoniae

    Tammeorg, Teele

    2010-01-01

    Esitajate liidu arvates tuleks maksu alla minevate seadmete hulka arvata ka blu-ray plaadid, MP3-mängijad ja pleieriga mobiiltelefonid, millel on mälumahtu üle 128 MB. Elisa pressiesindaja Marika Raiski arvamus

  20. Kindralpolkovnik Maiorov : "Teie mured on ka meie mured!" / Tiit Tambi

    Index Scriptorium Estoniae

    Tambi, Tiit

    1993-01-01

    President Lennart Meri kohtumine Venemaa relvajõudude loode väegrupi ülemjuhataja kindralpolkovnik Leonid Majoroviga, 9. veebruar 1993. Ka kindralpolkovniku kohtumistest Eestis elavate sõjaveteranidega

  1. Võitlus terrorismiga on ka meie kohus / Ando Leps

    Index Scriptorium Estoniae

    Leps, Ando, 1935-

    2002-01-01

    Ilmunud ka: Kesknädal 25. september lk. 4 (lühendatult). Septembri alguses Toledo Ülikoolis toimunud Euroopa Kriminoloogia Assotsiatsiooni II konverentsist. Autori ettekandest "Rahvusvaheline terrorism ja Eesti". Autor: Keskerakond. Parlamendisaadik

  2. Ka-Band MMIC T/R Module Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This Phase II proposal is presented as the follow on to the Phase I SBIR contract number NNC06CB21C entitled "Ka-band MMIC T/R Module" For active microwave...

  3. A comparative study of RADAR Ka-band backscatter

    Science.gov (United States)

    Mapelli, D.; Pierdicca, N.; Guerriero, L.; Ferrazzoli, Paolo; Calleja, Eduardo; Rommen, B.; Giudici, D.; Monti Guarnieri, A.

    2014-10-01

    Ka-band RADAR frequency range has not yet been used for Synthetic Aperture Radar (SAR) from space so far, although this technology may lead to important applications for the next generation of SAR space sensors. Therefore, feasibility studies regarding a Ka-band SAR instrument have been started [1][2], for the next generation of SAR space sensors. In spite of this, the lack of trusted references on backscatter at Ka-band revealed to be the main limitation for the investigation of the potentialities of this technology. In the framework of the ESA project "Ka-band SAR backscatter analysis in support of future applications", this paper is aimed at the study of wave interaction at Ka-band for a wide range of targets in order to define a set of well calibrated and reliable Ka-band backscatter coefficients for different kinds of targets. We propose several examples of backscatter data resulting from a critical survey of available datasets at Ka-band, focusing on the most interesting cases and addressing both correspondences and differences. The reliability of the results will be assessed via a preliminary comparison with ElectroMagnetic (EM) theoretical models. Furthermore, in support of future technological applications, we have designed a prototypal software acting as a "library" of earth surface radar response. In our intention, the output of the study shall contribute to answer to the need of a trustworthy Ka-Band backscatter reference. It will be of great value for future technological applications, such as support to instrument analysis, design and requirements' definition (e.g.: Signal to Noise Ratio, Noise Equivalent Sigma Zero).

  4. BP Investment Exceeds $4 Bln in china

    Institute of Scientific and Technical Information of China (English)

    Wang Ping

    2008-01-01

    @@ British Petroleum (BP) recently signed a series of agreements with China including those in clean energy and wind power generation, during British Prime Minister Gordon Brown's visit to China in mid-January.

  5. The millimetre spectrum of BP Cru

    Science.gov (United States)

    Pestalozzi, Michele; Hobbs, George; Torkelsson, Ulf

    2010-04-01

    In this experiment we attempt to detect the millimetre emission from the high-mass X-ray binary BP Cru. This object is composed of a hypergiant (Wray 977) and a slow spinning X-ray pulsar (GX301-2). The recent ATCA observations of centimeter emission (Pestalozzi et al. 2009, this was the first detection of radio emission towards BP Cru) suggested that radio emission consists of two components, a transient non-thermal one and a persistent thermal one, probably arising from the large stellar wind of Wray 977. As stellar winds often show a positive spectral index, we ask to observe BP Cru at 13 and 7 mm, where we expect fluxes of around 1 mJy. Any detection will allow us to probe the inner parts of the wind and characterise the structure of the stellar wind of BP Cru. For this detection experiment we require 11 hours of observations with ATCA.

  6. The potentials for creating sustainable rural tourism in Bačka

    Directory of Open Access Journals (Sweden)

    Stankov Uglješa

    2007-01-01

    Full Text Available Average rural household in Bačka mostly depend on agricultural activities. Modern society changes, especially changes in agriculture production imply need for diversification of business activities. Rural tourism can be important part of rural economy for some villages in Bačka. Fertile plain, Danube, Tisa and other smaller rivers, animals and games represent base of natural tourist attractions of rural tourism. However, main competitive advantages of Bačka are anthropogenic values. Traditional pannonian houses, baroques churches, numerous rural festivities, and "melting point" of different nationalities make good base for rural tourism development. Different combinations of rural attractions create several tourist experiences of this region: authentic tourist experience at "szalashes", particular tourist experience in villages, intensive tourist experience of rural events and manifestations, not authentic tourist experiences of pseudo rural attractions and complex tourist experience in rural areas. Regarding to emitive centers of rural tourist demand can be specified tree regions for development of rural tourism - region of Novi Sad, Subotica, and Sombor. Rural tourism can make a valuable contribution to rural economies, job creation, landscape conservation, retention of rural population, support to rural culture and tradition, nature conservation and other. At the same time, rural tourism is facing various limitations. With in this context, rural tourism planning has to include principles of sustainable development.

  7. PALEOEARTHQUAKE EVENTS AND FORMATION OF RIVER TERRACES IN ACTIVE ANTICLINE REGION,NORTHERN PIEDMONT OF TIANSHAN MOUNTAINS, CHINA%天山北麓活动背斜区河流阶地与古地震事件

    Institute of Scientific and Technical Information of China (English)

    杨晓平; 李安; 黄伟亮; 张玲

    2011-01-01

    Using the aerial remote sensing photos and Google earth satellite images,we find seven terraces at the both sides along the Kuytun River in Dushanzi active anticline area, northern piedmont of Tians-han. Based on the field investigation, we find that all these terraces are pedestal terraces. The rock of pedestal is Pliocene mud rock, and on the top of each terrace pedestal are the stratums of sandy gravel or sandy clay with 2. 5 ~ 15m in thickness. We collected samples from deposits of all terraces for OSL (optically stimulated luminescence) geological dating using the SMAR( single-multiple-aliquot-regeneration) method on fine grains. We also performed dating using the C method to the samples from the deposit of terrace T, of the Kuytun River. The results show that the ages of all these deposits are the later phase of the Late Pleistocene. The accumulation time of the upper stratum for T, , T2, T3 , T5 , T6and T7 terraces is about 1. 7ka, 14. 98ka,20. 7 ~ 27. 3ka,29. 3 ~ 39. 2ka,47 ~ 56ka and 103 ~ 118ka,respectively. Combining with late Quaternary climate change,we believe that the formation age forT1 ~T7 terraces of Kuytun River are 1. 7ka, 14ka,20ka,25ka, 30ka,50ka and lOOkaBP. Paleo-earthquake data reveal that eight paleoearthquake events occurred on the Dushanzi-Anjihai reverse fault since about 25ka BP, respectively at 2ka, 3. 4ka, 4. 3ka, 5. 8ka, 7. 5ka, 12. 8ka, 18ka and 24ka BP. Comparing the ages of paleoearthquakes and terraces,we find that the ages of the latest,the sixth, the seventh and the eighth paleoearthquake are roughly corresponding to the formation times of T1 , T2 ,T3and T4 terraces,respectively. The other four paleoearthquake events occurred during the period after the formation of T2and before the formation of T,. In this time,no terraces developed along the Kuytun River, but the Kuytun River incised rapidly for 40m. We believe that the paleoearthquake e-vents resulted in the fast uplift of Dushanzi active anticline on the hanging wall of

  8. Relative role of El Niño events in the mid-Holocene global energetic changes

    Science.gov (United States)

    Saint-Lu, Marion; Braconnot, Pascale; Leoup, Julie; Marti, Olivier

    2016-04-01

    It has been shown that El Niño events contribute to discharge the warm pool excess of energy out of the tropical Pacific. In a different climate, in which the climatological Walker and Hadley circulations are modified - as it is likely to be the case in the future - , the ocean heat content in the tropical Pacific is altered, which might have an effect on the El Niño amplitude and/or frequency and thereby on the role of El Niño on the energy redistribution. The mid-Holocene (6ka BP) offers a good example of changes in the distribution of solar energy, since the equator-pole gradient is different from today. We analyze long stable simulations of 6ka BP and the pre-industrial era and discuss the mean and El Niño-related energy transports in the two climates. Comparing heat fluxes and transports during El Niño years and ``normal'' years, we show that the role of heat pump played by the tropical Pacific is reduced in the mid-Holocene in our simulations, during both normal years and El Niño years. We demonstrate that this is not a direct response to the radiative forcing but this is further amplified by changes in the large scale circulation. Furthermore, we analyze the relative contribution of El Niño events in the energy redistribution in each climate and show that it is reduced in the mid-Holocene compared to the pre-industrial.

  9. Environmental response to the cold climate event 8200 years ago as recorded at Hoejby Soe, Denmark

    Energy Technology Data Exchange (ETDEWEB)

    Rasmussen, Peter (Geological Survey of Denmark and Greenland, Copenhagen (Denmark)); Ulfeldt Hede, M.; Noe-Nygaard, N. (Univ. of Copenhagen, Dept. of Geography and Geology, Copenhagen (Denmark)); Clarke, A.L. (APEM Manchester Lab., Stockport (United Kingdom)); Vinebrooke, R.D. (Univ. of Alberta, Dept. of Biological Science - Freshwater Biodiversity Lab., Edmonton (Canada))

    2008-07-15

    The need for accurate predictions of future environmental change under conditions of global warming has led to a great interest in the most pronounced climate change known from the Holocene: an abrupt cooling event around 8200 years before present (present = A.D. 1950), also known as the '8.2 ka cooling event' (ka = kilo-annum = 1000 years). This event has been recorded as a negative delta18OMICRON excursion in the central Greenland ice cores (lasting 160 years with the lowest temperature at 8150) and in a variety of other palaeoclimatic archives including lake sediments, ocean cores, speleothems, tree rings, and glacier oscillations from most of the Northern Hemisphere. In Greenland the maximum cooling was estimated to be 6 +- 2 deg. C while in southern Fennoscandia and the Baltic countries pollenbased quantitative temperature reconstructions indicate a maximum annual mean temperature decrease of around 1.5 deg. C. Today there is a general consensus that the primary cause of the cooling event was the final collapse of the Laurentide ice sheet near Hudson Bay and the associated sudden drainage of the proglacial Lake Agassiz into the North Atlantic Ocean around 8400 B.P. . This freshwater outflow, estimated to amount to c. 164,000 km3 of water, reduced the strength of the North Atlantic thermohaline circulation and thereby the heat transported to the North Atlantic region, resulting in an atmospheric cooling. The climatic consequences of this meltwater flood are assumed to be a good geological analogue for future climate-change scenarios, as a freshening of the North Atlantic is projected by almost all global-warming models and is also currently being registered in the region. In an ongoing project, the influence of the 8.2 ka cooling event on a Danish terrestrial and lake ecosystem is being investigated using a variety of biological and geochemical proxy data from a sediment core extracted from Hojby So, north-west Sjaelland. Here we present data on

  10. Equipment Design for Oxidation of 1BP/2BP Using NO_x

    Institute of Scientific and Technical Information of China (English)

    ZHOU; Xian-ming; CHANG; Shang-wen; LI; Gao-liang; LAN; Tian; LIU; Jin-ping; TANG; Hong-bin; HE; Hui

    2013-01-01

    NOx can Oxidize the reductants in 1BP and 2BP feed of Purex process,and can adjust the oxidation state of plutonium as Pu(Ⅳ)to meet the need of 2AF feed.Using NOx in Purex process can reduce the volumn of solid waste effectively,and attract more and more interest of researchers.In this work the oxidation of reductants in 1BP/2BP feed were investigated in glass column as the same-current mode,in

  11. A long distance colonization event of Chinese endemic bat Myotis davidii%中国特有蝙蝠大卫鼠耳蝠种群长距离殖民事件

    Institute of Scientific and Technical Information of China (English)

    由玉岩; 杜江峰

    2011-01-01

    2001-2009年,在全国范围内采集了14个地理种群总计126个样本,以线粒体控制区作为分子标记,分析大卫鼠耳蝠种群系统发育关系和殖民历史.根据线粒体控制区序列构建的TCS网络图,将大卫鼠耳蝠的14个地理种群划分成3个地理区域,分别为中东部平原区、西南高原区和南方丘陵区.在53个单倍型中,浙江的单倍型14、贵州的单倍型47、广东的单倍型50分别为3个地理区域的祖先单倍型.Geodis、错配分布和中性检验的分析结果表明,中东部平原区(76.12和79.17 ka BP)和西南高原区(69.12 ka BP)曾发生过种群扩张事件,并于61.24 ka BP发生了一次由西南高原向中东部平原区的长距离殖民事件.分子生物学、仿生学、解剖学和空气动力学的证据,共同揭示了大卫鼠耳蝠具有长距离的迁移能力.%In order to reveal the population phylogenetic relationships and colonization history of Chinese endemic bat species Myotis davidii. a total of 126 samples from 14 populations in nationwide were collected in 2001-2009 , taking the mitochondrial control region as the molecular marker. Based on the TCS network diagram of the mitochondrial DNA control region sequences. the 14geographical populations were divided into three geographical regions, i. e. , mid-east plain region,southwest plateau region, and south hills region. In the 53 haplotypes, the No. 14 in Zhejiang Province. No. 47 in Guizhou Province. and No. 50 in Guangdong Province were the ancestors in the three regions, respectively. Based on Geodis analysis, mismatch distribution analysis. and neutrality test, the population expansion events were found in mid-eastern plain region (76. 12 and 79. 17 ka BP) and southwest plateau (69. 12 ka BP). In 61. 24 ka BP, a long distance migration event originated from the southwest plateau region to the mid-east plain region occurred. The evidences of molecular biology, bionics, anatomy, and aerodynamics all revealed

  12. Evolution of Jilantai Salt Lake, Inner Mongolia in the last 13.8 ka%13.8ka以来内蒙古吉兰泰盐湖的演化过程

    Institute of Scientific and Technical Information of China (English)

    于志同; 刘兴起; 王永; 葛兆帅; 潘存峰; 杨波

    2012-01-01

    Evolution of Jilantai Salt Lake in the last 13.8 ka was reconstructed based on the analysis of evaporate minerals, carbonate minerals and detrital minerals from the core JLT-20I0. The lake water was fresh or slightly salty between 13.8 and 11.7 cal ka BP. The lake began to shrink between 11.7 and 10.2 cal ka BP, and then it entered into the lagoon stage. Sulfate deposition occurred in Jilantai Salt Lake between 10.2 and 5.5 cal ka BP, meanwhile, from 9.0 to 8.2 cal ka BP there existed a significant desalination process. The lake reached full chloride deposition stage between 3.7 and 2.0 cal ka BP, and a short and obvious desalt period occurred between 2.0 and 1.7 cal ka BP. Overall, evaporate minerals appeared just at the beginning of the Holocene when temperature increased relative to the late glacial. As the regional arid climate continually affecting the area, Jilantai Salt Lake gradually shrank and salinized.%通过系统分析吉兰泰盐湖JLT-2010孔蒸发盐类矿物、碳酸盐矿物、碎屑岩矿物等,结合AMS14C测年获得的年代序列,研究该湖13.8 ka以来的演化过程.结果表明:吉兰泰盐湖13.8-11.7 calka BP期间水体较淡;11.7-10.2 calkaBP期间湖泊开始萎缩、咸化,进入咸水湖阶段;10.2-5.5 cal ka BP期间湖泊进入硫酸盐沉积阶段,其中9.0-8.2 cal kaBP经历了一个明显的淡化过程;5.5 cal ka BP以来,湖泊成盐作用进一步加强,由前期的硫酸盐沉积转变为氯化物沉积,其中3.7-2.0 cal ka BP达到全面氯化物沉积阶段,2.0- 1.7 cal ka BP又经历了一个短暂而明显的淡化过程;目前,该盐湖已进入干盐湖发展阶段.总体而言,吉兰泰盐湖蒸发盐类矿物主要是在全新世增温的背景条件下逐步萎缩形成的,由于区域性干旱气候的持续影响,吉兰泰盐湖逐步萎缩、咸化,进而析盐.

  13. Cyclone Xaver seen by SARAL/AltiKa

    Science.gov (United States)

    Scharroo, Remko; Fenoglio, Luciana; Annunziato, Alessandro

    2014-05-01

    meteorological forecasts produced by the European Centre for Medium-Range Weather Forecasts (ECMWF) to estimate (with a 2-day lead time) potential storm surges due to cyclone or general storm events. Departure between model and altimeter-derived values, in particularly wind, are investigated and discussed. The qualitative agreement is satisfactory; the maximum storm surge peak is correctly estimated by BSH but underestimated by JRC due to insufficient wind forcing. The wind speed of SARAL/AltiKa agrees well with the ECMWF model wind speed but is lower than the DWD model estimate. The authors acknowledge the kind support from the BSH, the Bundesumweltministerium (BMU), Projectträger Jülich (PTJ), and the Wasser- und Schifffahrtsverwaltung des Bundes (WSV).

  14. BP, Cardiovascular Disease, and Death in the Folic Acid for Vascular Outcome Reduction in Transplantation Trial

    Science.gov (United States)

    John, Alin; Weir, Matthew R.; Smith, Stephen R.; Hunsicker, Lawrence; Kasiske, Bertram L.; Kusek, John W.; Bostom, Andrew; Ivanova, Anastasia; Levey, Andrew S.; Solomon, Scott; Pesavento, Todd; Weiner, Daniel E.

    2014-01-01

    The optimal BP level in kidney transplant recipients remains uncertain. This post hoc analysis of the Folic Acid for Vascular Outcome Reduction in Transplantation (FAVORIT) trial cohort assessed associations of BP with a pooled cardiovascular disease (CVD) outcome and with all-cause mortality. In 3474 prevalent kidney transplant patients, mean age was 52±9 years, 63% were men, 76% were white, 20% had a history of CVD, 40% had a history of diabetes mellitus, and the median time since transplant was 4.1 years (25th to 75th percentiles, 1.7–7.4); mean systolic BP was 136±20 mmHg and mean diastolic BP was 79±12 mmHg. There were 497 CVD events and 406 deaths. After adjustment for demographic and transplant characteristics and CVD risk factors, each 20-mmHg increase in baseline systolic BP associated with a 32% increase in subsequent CVD risk (hazard ratio [HR], 1.32; 95% confidence interval [95% CI], 1.19 to 1.46) and a 13% increase in mortality risk (HR, 1.13; 95% CI, 1.01 to 1.27). Similarly, after adjustment, at diastolic BP levels70 mmHg, there was no significant relationship between diastolic BP and outcomes. Higher systolic BP strongly and independently associated with increased risk of CVD and all-cause mortality, without evidence of a J shape, whereas only lower levels of diastolic BP associated with increased risk of CVD and death in this trial. PMID:24627349

  15. THE CURRENT STAR FORMATION RATE OF K+A GALAXIES

    Energy Technology Data Exchange (ETDEWEB)

    Nielsen, Danielle M. [Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706 (United States); Ridgway, Susan E.; De Propris, Roberto [Cerro Tololo Inter-American Observatory Casilla 603, La Serena (Chile); Goto, Tomotsugu, E-mail: nielsen@astro.wisc.edu [Dark Cosmology Center, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen O (Denmark)

    2012-12-20

    We derive the stacked 1.4 GHz flux from the FIRST survey for 811 K+A galaxies selected from the Sloan Digital Sky Survey Data Release 7. For these objects we find a mean flux density of 56 {+-} 9 {mu}Jy. A similar stack of radio-quiet white dwarfs yields an upper limit of 43 {mu}Jy at a 5{sigma} significance to the flux in blank regions of the sky. This implies an average star formation rate of 1.6 {+-} 0.3 M{sub Sun} yr{sup -1} for K+A galaxies. However, the majority of the signal comes from {approx}4% of K+A fields that have aperture fluxes above the 5{sigma} noise level of the FIRST survey. A stack of the remaining galaxies shows little residual flux consistent with an upper limit on star formation of 1.3 M{sub Sun} yr{sup -1}. Even for a subset of 456 'young' (spectral ages <250 Myr) K+A galaxies, we find that the stacked 1.4 GHz flux is consistent with no current star formation. Our data suggest that the original starburst has been terminated in the majority of K+A galaxies, but that this may represent part of a duty cycle where a fraction of these galaxies may be active at a given moment with dusty starbursts and active galactic nuclei being present.

  16. BP to Increase Production Capacity of PTA at BP Zhuhai Chemical

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    BP has announced a strategic plan for its substantial development in China. It is actively proceeding with its project to increase its production capacity of purified terephthalic acid, or PTA, at the BP Zhuhai Chemical Company Limited facility i n Guangdong, China.

  17. Distribution of tetraether lipids in the 25-ka sedimentary record of Lake Challa: extracting reliable TEX86 and MBT/CBT palaeotemperatures from an equatorial African lake

    Science.gov (United States)

    Sinninghe Damsté, Jaap S.; Ossebaar, Jort; Schouten, Stefan; Verschuren, Dirk

    2012-09-01

    The distribution of isoprenoid and branched glycerol dialkyl glycerol tetraether (GDGT) lipids was studied in the sedimentary record of Lake Challa, a permanently stratified, partly anoxic crater lake on the southeastern slope of Mt. Kilimanjaro (Kenya/Tanzania), to examine if the GDGTs could be used to reconstruct past variation in regional temperature. The study material comprised 230 samples from a continuous sediment sequence spanning the last 25 ka with excellent age control based on high-resolution AMS 14C dating. The distribution of GDGTs showed large variation through time. In some time intervals (i.e., from 20.4 to 15.9 ka BP and during the Younger Dryas, 12.9-11.7 ka BP) crenarchaeol was the most abundant GDGT, whereas at other times (i.e., during the Early Holocene) branched GDGTs and GDGT-0 were the major GDGT constituents. In some intervals of the sequence the relative abundance of GDGT-0 and GDGT-2 was too high to be derived exclusively from lacustrine Thaumarchaeota, suggesting a sizable contribution from methanogens and other archaea. This severely complicated application of TEX86 palaeothermometry in this lake, and limited reliable reconstruction of lake water temperature to the time interval 25-13 ka BP, i.e. the Last Glacial Maximum and the period of post-glacial warming. The TEX86-inferred timing of this warming is similar to that recorded previously in two of the large African rift lakes, while its magnitude is slightly or much higher than that recorded at these other sites, depending on which lake-based TEX86 calibration is used. Application of calibration models based on distributions of branched GDGTs developed for lakes inferred temperatures of 15-18 °C for the Last Glacial Maximum and 19-22 °C for the Holocene. However, the MBT/CBT palaeothermometer reconstructs temperatures as low as 12 °C for a Lateglacial period centred on 15 ka BP. Variation in down-core values of the BIT index are mainly determined by the varying production rate of

  18. Ka-band MMIC microstrip array for high rate communications

    Science.gov (United States)

    Lee, R. Q.; Raquet, C. A.; Tolleson, J. B.; Sanzgiri, S. M.

    1991-01-01

    In a recent technology assessment of alternative communication systems for the space exploration initiative (SEI), Ka-band (18 to 40 GHz) communication technology was identified to meet the mission requirements of telecommunication, navigation, and information management. Compared to the lower frequency bands, Ka-band antennas offer higher gain and broader bandwidths; thus, they are more suitable for high data rate communications. Over the years, NASA has played an important role in monolithic microwave integrated circuit (MMIC) phased array technology development, and currently, has an ongoing contract with Texas Instrument (TI) to develop a modular Ka-band MMIC microstrip subarray (NAS3-25718). The TI contract emphasizes MMIC integration technology development and stipulates using existing MMIC devices to minimize the array development cost. The objective of this paper is to present array component technologies and integration techniques used to construct the subarray modules.

  19. Kažun kao prepoznatljiv element identiteta Istre

    OpenAIRE

    2013-01-01

    Temeljem terenskih istraživanja provedenih posljednjih desetljeća te prikupljene literature u članku se analizira pojam, funkcija i značaj građevine koja se u Istri označava najčešće imenom kažun, također casita (u nekoliko lokaliteta istroromanskoga govornog područja) te hižica, hiška, koča, kućica na sjevernom dijelu poluotoka. Konstrukcija kažuna podrazumijeva način građenja suhozidom na kružnoj osnovi: kameni prstenovi podižu se u kružni zid, a zatim sužavaju u „lažni svod“ koji se zasipa...

  20. Predicting pKa for proteins using COSMO-RS

    DEFF Research Database (Denmark)

    Andersson, Martin Peter; Jensen, Jan Halborg; Stipp, Susan Louise Svane

    2013-01-01

    We have used the COSMO-RS implicit solvation method to calculate the equilibrium constants, pKa, for deprotonation of the acidic residues of the ovomucoid inhibitor protein, OMTKY3. The root mean square error for comparison with experimental data is only 0.5 pH units and the maximum error 0.8 p......H units. The results show that the accuracy of pKa prediction using COSMO-RS is as good for large biomolecules as it is for smaller inorganic and organic acids and that the method compares very well to previous pKa predictions of the OMTKY3 protein using Quantum Mechanics/Molecular Mechanics. Our approach...

  1. Did Lake Bonneville Experience A Major Water-Budget Shift At 17.4 cal ka?

    Science.gov (United States)

    Oviatt, C.

    2009-12-01

    Lake Bonneville, in western Utah, had transgressed to its highest level by 18.3 cal ka, overflowed into the Snake River drainage basin until 17.4 cal ka, then catastrophically dropped 100 m as its overflow threshold was washed out. This event, which is referred to as the “Bonneville flood,” is well documented geomorphically, stratigraphically, and geochronologically. At the same time the Bonneville flood was occurring, the level of Lake Estancia in central New Mexico dropped over 30 m then returned to its previous high level in an event caused by climate change in that basin. The question is: “did Lake Bonneville experience a correlative climate-induced shift in its water budget (a decrease in the ratio of input to output), even while it continuously overflowed before, during, and after the Bonneville flood?” The answer to this question has a bearing on the global effects of the climate change that is well documented in the Estancia basin. Data from sediment cores from the Bonneville basin are providing a means to address the question. Data include: ostracode faunal changes, total inorganic carbon, stable isotopes, detrital sand, and mineralogy. The challenge is to identify the measurable characteristics of the sediment core that can be used to clearly separate the effects of water-budget change from those caused by the catastrophic (essentially instantaneous) 100-m lowering of Lake Bonneville.

  2. X-/Ka-band dichroic plate noise temperature reduction

    Science.gov (United States)

    Veruttipong, W.; Lee, P.

    1994-11-01

    The X-/Ka-band (8.4 GHz/32.0 GHz) dichroic plate installed as DSS 13 contributes an estimated 3 K to the system noise temperature at 32.0 GHz. Approximately 1 percent of the Ka-band incident field is reflected by the plate into the 300-K environment of the DSS-13 pedestal room. A low-cost, easily implemented method of reducing the noise temperature is presented. Using a curved reflector, the reflected field can be re-focused into an 80-K cold load, reducing the noise temperature contribution of the dichroic plate by about 2 K.

  3. Identiteto paieška šeimos fotografijose

    OpenAIRE

    Kniškaitė, Kristina

    2012-01-01

    Darbe nagrinėjamas identitetas ir jo paieška šeimos fotografijose. Keliamas tikslas išanalizuoti identitetą ir jo vizualumą formuojančius faktorius. Kadangi darbo tema susijusi su savęs paieška, analizės objektu tampa tapatumas, o šeima pasirinkta kaip priemonė jam atskleisti. Albuminės fotografijos šiame darbe naudojamos kaip giminės istorinis šaltinis, kaip paveldas, kurio pagalba ne tik vizualiai atkuriamas šeimos genealoginis medis, bet ir pereinama prie interpretacinio požiūrio į albumi...

  4. Pollen-climate relationships in time (9 ka, 6 ka, 0 ka) and space (upland vs. lowland) in eastern continental Asia

    Science.gov (United States)

    Tian, Fang; Cao, Xianyong; Dallmeyer, Anne; Zhao, Yan; Ni, Jian; Herzschuh, Ulrike

    2017-01-01

    Temporal and spatial stability of the vegetation-climate relationship is a basic ecological assumption for pollen-based quantitative inferences of past climate change and for predicting future vegetation. We explore this assumption for the Holocene in eastern continental Asia (China, Mongolia). Boosted regression trees (BRT) between fossil pollen taxa percentages (Abies, Artemisia, Betula, Chenopodiaceae, Cyperaceae, Ephedra, Picea, Pinus, Poaceae and Quercus) and climate model outputs of mean annual precipitation (Pann) and mean temperature of the warmest month (Mtwa) for 9 and 6 ka (ka = thousand years before present) were set up and results compared to those obtained from relating modern pollen to modern climate. Overall, our results reveal only slight temporal differences in the pollen-climate relationships. Our analyses suggest that the importance of Pann compared with Mtwa for taxa distribution is higher today than it was at 6 ka and 9 ka. In particular, the relevance of Pann for Picea and Pinus increases and has become the main determinant. This change in the climate-tree pollen relationship parallels a widespread tree pollen decrease in north-central China and the eastern Tibetan Plateau. We assume that this is at least partly related to vegetation-climate disequilibrium originating from human impact. Increased atmospheric CO2 concentration may have permitted the expansion of moisture-loving herb taxa (Cyperaceae and Poaceae) during the late Holocene into arid/semi-arid areas. We furthermore find that the pollen-climate relationship between north-central China and the eastern Tibetan Plateau is generally similar, but that regional differences are larger than temporal differences. In summary, vegetation-climate relationships in China are generally stable in space and time, and pollen-based climate reconstructions can be applied to the Holocene. Regional differences imply the calibration-set should be restricted spatially.

  5. Polysaccharide Nanoparticles for Efficient siRNA Targeting in Cancer Cells by Supramolecular pKa Shift

    Science.gov (United States)

    Zhang, Ying-Ming; Yang, Yang; Zhang, Yu-Hui; Liu, Yu

    2016-01-01

    Biomacromolecular pKa shifting is considered as one of the most ubiquitous processes in biochemical events, e.g., the enzyme-catalyzed reaction and protein conformational stabilization. In this paper, we report on the construction of biocompatible polysaccharide nanoparticle with targeting ability and lower toxicity by supramolecular pKa shift strategy. This was realized through a ternary assembly constructed by the dual host‒guest interactions of an adamantane-bis(diamine) conjugate (ADA) with cucurbit[6]uril (CB[6]) and a polysaccharide. The potential application of such biocompatible nanostructure was further implemented by the selective transportation of small interfering RNA (siRNA) in a controlled manner. It is demonstrated that the strong encapsulation of the ADA’s diammonium tail by CB[6] not only reduced the cytotoxicity of the nano-scaled vehicle but also dramatically enhanced cation density through an obvious positive macrocycle-induced pKa shift, which eventually facilitated the subsequent siRNA binding. With a targeted polysaccharide shell containing a cyclodextrin‒hyaluronic acid conjugate, macrocycle-incorporated siRNA polyplexes were specifically delivered into malignant human prostate PC-3 cells. The supramolecular polysaccharide nanoparticles, the formation of which was enabled and promoted by the complexation-assisted pKa shift, may be used as a versatile tool for controlled capture and release of biofunctional substrates. PMID:27363811

  6. Polysaccharide Nanoparticles for Efficient siRNA Targeting in Cancer Cells by Supramolecular pKa Shift

    Science.gov (United States)

    Zhang, Ying-Ming; Yang, Yang; Zhang, Yu-Hui; Liu, Yu

    2016-07-01

    Biomacromolecular pKa shifting is considered as one of the most ubiquitous processes in biochemical events, e.g., the enzyme-catalyzed reaction and protein conformational stabilization. In this paper, we report on the construction of biocompatible polysaccharide nanoparticle with targeting ability and lower toxicity by supramolecular pKa shift strategy. This was realized through a ternary assembly constructed by the dual host‒guest interactions of an adamantane-bis(diamine) conjugate (ADA) with cucurbit[6]uril (CB[6]) and a polysaccharide. The potential application of such biocompatible nanostructure was further implemented by the selective transportation of small interfering RNA (siRNA) in a controlled manner. It is demonstrated that the strong encapsulation of the ADA’s diammonium tail by CB[6] not only reduced the cytotoxicity of the nano-scaled vehicle but also dramatically enhanced cation density through an obvious positive macrocycle-induced pKa shift, which eventually facilitated the subsequent siRNA binding. With a targeted polysaccharide shell containing a cyclodextrin‒hyaluronic acid conjugate, macrocycle-incorporated siRNA polyplexes were specifically delivered into malignant human prostate PC-3 cells. The supramolecular polysaccharide nanoparticles, the formation of which was enabled and promoted by the complexation-assisted pKa shift, may be used as a versatile tool for controlled capture and release of biofunctional substrates.

  7. A New Sediment Core From Lake Elsinore, CA Reveals Evidence for Large Amplitude Hydrologic Change Between 9ka and 30ka

    Science.gov (United States)

    Kirby, M. E.; Feakins, S. J.; Fantozzi, J. M.; Lund, S.; Zimmerman, S. R.; Hiner, C.

    2011-12-01

    Lake Elsinore is the largest natural lake in coastal southwestern North America (CSWNA). Building on cores taken in 2003, a new 20-meter core (LEDC10-1) spanning 9ka to 30ka was acquired in 2010. Twenty-one AMS 14C dates, mostly on discrete organic material (e.g. seeds, charcoal), provide an initial age model. On average 1 cm equals 13 years of sedimentation making this new core the highest resolution, most complete glacial-age terrestrial archive yet obtained from CSWNA. We present initial multi-proxy results including magnetic susceptibility, organic and carbonate content, grain size, CN ratios, and δD plant leaf waxes to infer past climate state and change. The deglacial sequence is characterized by large amplitude hydrologic change: from a very wet full glacial to a dry Holocene. A δD shift of 100 per mil indicates a dramatic shift in either P:E ratio or changes in storm tracks/moisture sources. Sand % increases from the Holocene into the glacial, which is interpreted to indicate a wetter-than-present glacial climate in CSWNA. High amplitude sand variability at centennial-to-millennial scales also suggests a highly dynamic climate in CSWNA during the last glacial. Comparisons of the Elsinore record of abrupt hydrologic events to high latitude records show coherence with various climate intervals including Heinrich events 2 and 3. We also observe connections to local marine conditions in the Santa Barbara Basin. Future plans include additional dates, grain size, elemental data, compound specific isotope analyses, microfossil identification/counts, and palynology.

  8. A high-resolution stalagmite O-C isotope record from Nan-jing and its rapid response to climatic events

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Here we discussed rapid response of the cave temperature and vegetation to the four Dansgaard-Oeschger cold and warm cycles during 50-40 kaBP based on results of oxygen and carbon stable isotopic compositions from a stalagmite in Tangshan, Nanjing. It is found that the amount of C3 vegetation relative to C4-type declines during the D-O warm events, indicating the decrease of the effective meteoric precipitation. Compared with O-isotope records of the Greenland ice core, the stalagmite record displays a very similar pattern to Greenland ice core record over the decade-century time scale, suggesting that the changes of the East Asian monsoon climate are in accordance with the high-latitude polar climate in the short-term time scale. The age of the ice-rafted H5 event in the stalagmite record, however, preceded that of Greenland ice cores by 2 ka. This out of phase between the remote areas cannot be yet proven because the two time scales were determined from different dating methods.``

  9. CaCO3 CYCLES IN SALAWUSU RIVER BASIN SINCE 150KA B. P.

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    This paper, with Milanggouwan stratigraphic section as a typical section of the Salawusu River Basin,explores the relation between CaCO3 content distribution and climate change since 150 ka B.P. and concludes that: 1) The low-high changes of CaCO3 content in the section has a remarkable corresponding relation with the sedimentary cycles of ancient aeolian sand and overlying fluviolacustrine facies or palaeosols. 2) CaCO3 distribution in aeolian sand is relatively meagre, ranging from 0. 8% -7.18%, or on an average 2. 50% but relatively enriches in the fluviolacustrine faceis and palaeosols, ranging from 2. 20% - 14. 9%, or on an average 5.74%. This implies that they have different climatic backgrounds. The former was the product of erosion, transport and deposition by wind under arid and cold climatic conditions, whereas the latter was related to its special low-lying geomorphic position between the Ordos Plateau and Loess Plateau and warm-humid climatic environment. When the climatic became warm and humid, fluviola custrine and swamp facies developed, soil-forming action strengthened, and low-lying catchment condition was favor able to CaCO3 accumulation. 3) The basic cause responsible for the multicycie of CaCO3 migration and accumulation in the Milanggouwan section may be the multiple alterations of winter and summer monsoons over the Mu Us Desert under the influences of climatic fluctuation of glacial and interglacial periods in the Northern Hemisphere since 150ka B. P..

  10. 2000 Johnston Site 3B-P

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Underwater Site 3B-P was established at Johnston Atoll by Dr. James Maragos, U.S. Fish & Wildlife Service, on July 3, 2000. With a start point (meter 0) at...

  11. 2000 Johnston Site 1B-P

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Underwater Site 1B-P was established at Johnston Atoll by Dr. James Maragos, U.S. Fish & Wildlife Service, on June 29, 2000. With a start point (meter 0) at...

  12. 2000 Johnston Site 2B-P

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Underwater Site 2B-P was established at Johnston Atoll by Dr. James Maragos, U.S. Fish & Wildlife Service, on June 30, 2000. With a start point (meter 0) at...

  13. Sub-pluvial Saqqara and its possible impact on ancient Egyptian civilization in the Old Kingdom Period (4600 - 4100 yrs BP)

    Science.gov (United States)

    Welc, Fabian; Marks, Leszek

    2014-05-01

    ). A role of these wet intervals is incontestable and they can represent a sub-pluvial episode with two peaks at about 4600 and 4200 yrs BP, presumably of regional significance for north-eastern Africa. The authors suggest to name this relatively wet period the Saqqara Sub-pluvial. Based on the present knowledge, the extremely dynamic terminal phase of the second peak of the Saqqara Sub-pluvial and the following sudden desertification noted in deposits at archaeological sites in Saqqara and in the adjoining area (Abusir, Giza) should be roughly correlated with global climatic perturbation of the 3rd Bond Event or 4.2 ka Rapid Climate Change. The climate change in that time resulted in a collapse of the Egyptian civilization but also in rapid depopulation of Palestine, disintegration of the Acadian Empire in Mesopotamia and the Harappa Civilization in northwest India. Mechanism of this climate change is investigated within the project funded by National Science Centre in Poland (decision no. DEC-2012/05/B/ST10/00558).

  14. The closure of Pak1-dependent macropinosomes requires the phosphorylation of CtBP1/BARS.

    Science.gov (United States)

    Liberali, Prisca; Kakkonen, Elina; Turacchio, Gabriele; Valente, Carmen; Spaar, Alexander; Perinetti, Giuseppe; Böckmann, Rainer A; Corda, Daniela; Colanzi, Antonino; Marjomaki, Varpu; Luini, Alberto

    2008-04-09

    Membrane fission is an essential process in membrane trafficking and other cellular functions. While many fissioning and trafficking steps are mediated by the large GTPase dynamin, some fission events are dynamin independent and involve C-terminal-binding protein-1/brefeldinA-ADP ribosylated substrate (CtBP1/BARS). To gain an insight into the molecular mechanisms of CtBP1/BARS in fission, we have studied the role of this protein in macropinocytosis, a dynamin-independent endocytic pathway that can be synchronously activated by growth factors. Here, we show that upon activation of the epidermal growth factor receptor, CtBP1/BARS is (a) translocated to the macropinocytic cup and its surrounding membrane, (b) required for the fission of the macropinocytic cup and (c) phosphorylated on a specific serine that is a substrate for p21-activated kinase, with this phosphorylation being essential for the fission of the macropinocytic cup. Importantly, we also show that CtBP1/BARS is required for macropinocytic internalization and infection of echovirus 1. These results provide an insight into the molecular mechanisms of CtBP1/BARS activation in membrane fissioning, and extend the relevance of CtBP1/BARS-induced fission to human viral infection.

  15. Debris flow dominated alluvial fans in the Australian high country indicate that landscape denudation through the Holocene has been dominated by post-bushfire runoff events

    Science.gov (United States)

    Marren, Philip; Nyman, Petter; Kermode, Stephanie

    2016-04-01

    . The basal floodplain unit had a burnt upper silts unit overlying unburnt floodplain silts. Radiocarbon ages were measured from charcoal samples taken from all burnt units or debris flows with a fire signature. Ages reveal fire signatures at 10 ka BP, 8 ka BP (the burnt floodplain), then a fire at 1 ka intervals up to 3 ka BP, and fires at approximately 300 yr. intervals from 3 ka onwards. This archive of bushfire-triggered debris flows is distinctive in that it demonstrates a strong relationship between large bushfires, which vary in frequency according to regional climate changes during the Holocene, and enhanced landscape denudation, indicated by erosion of bedrock hillslope material. This enhanced erosion is coupled with transfer of sediment from hillslope to channel to alluvial fan and hence to the fluvial system. Sediment is primarily delivered directly to the river channel and transferred downstream during flood events, but there is also significant storage and remobilisation of bushfire-related sediment in the floodplain. This paper presents a model of hillslope response to bushfire in the context of sediment delivery to the fluvial system and Holocene climate changes.

  16. AcEST: BP919856 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000130_A02 514 Adiantum capillus-veneris mRNA. clone: YMU001_000130_A02. BP919856 - Show BP91985...is mRNA. clone: YMU001_000130_A02. Accession BP919856 Tissue type prothallium Developmental stage - Contig I...protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91985... generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919856|Adiantum c

  17. AcEST: BP919841 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000129_G06 496 Adiantum capillus-veneris mRNA. clone: YMU001_000129_G06. BP919841 - Show BP91984...is mRNA. clone: YMU001_000129_G06. Accession BP919841 Tissue type prothallium Developmental stage - Contig I...ase search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919841|Adiantum ca...e search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919841|Adiantum capi

  18. AcEST: BP919150 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000121_G08 485 Adiantum capillus-veneris mRNA. clone: YMU001_000121_G08. BP919150 - Show BP91915...is mRNA. clone: YMU001_000121_G08. Accession BP919150 Tissue type prothallium Developmental stage - Contig I...n of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91915... of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91915

  19. AcEST: BP920131 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_D06 495 Adiantum capillus-veneris mRNA. clone: YMU001_000133_D06. BP920131 - Show BP92013...is mRNA. clone: YMU001_000133_D06. Accession BP920131 Tissue type prothallium Developmental stage - Contig I..., Nucleic Acids Res. 25:3389-3402. Query= BP920131|Adiantum capillus-veneris mRNA...base search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920131|Adiantum c

  20. AcEST: BP919887 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000130_C10 511 Adiantum capillus-veneris mRNA. clone: YMU001_000130_C10. BP919887 - Show BP91988...is mRNA. clone: YMU001_000130_C10. Accession BP919887 Tissue type prothallium Developmental stage - Contig I...generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91988...on of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91988

  1. AcEST: BP920154 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_F09 487 Adiantum capillus-veneris mRNA. clone: YMU001_000133_F09. BP920154 - Show BP92015...is mRNA. clone: YMU001_000133_F09. Accession BP920154 Tissue type prothallium Developmental stage - Contig I...n database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920154|Adia...abase search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920154|Adiantum

  2. AcEST: BP921101 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000145_F04 489 Adiantum capillus-veneris mRNA. clone: YMU001_000145_F04. BP921101 - Show BP921101...is mRNA. clone: YMU001_000145_F04. Accession BP921101 Tissue type prothallium Developmental stage - Contig I...se search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921101|Adiantum cap... protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921101

  3. AcEST: BP914001 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000038_G04 493 Adiantum capillus-veneris mRNA. clone: YMU001_000038_G04. BP914001 - Show BP91400...is mRNA. clone: YMU001_000038_G04. Accession BP914001 Tissue type prothallium Developmental stage - Contig I...otein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP914001|...ic Acids Res. 25:3389-3402. Query= BP914001|Adiantum capillus-veneris mRNA, clone

  4. AcEST: BP919212 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000122_E05 508 Adiantum capillus-veneris mRNA. clone: YMU001_000122_E05. BP919212 - Show BP91921...is mRNA. clone: YMU001_000122_E05. Accession BP919212 Tissue type prothallium Developmental stage - Contig I... programs, Nucleic Acids Res. 25:3389-3402. Query= BP919212|Adiantum capillus-ven...ion of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919212|Adiantum capillus-

  5. AcEST: BP920173 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_H07 454 Adiantum capillus-veneris mRNA. clone: YMU001_000133_H07. BP920173 - Show BP92017...is mRNA. clone: YMU001_000133_H07. Accession BP920173 Tissue type prothallium Developmental stage - Contig I...Res. 25:3389-3402. Query= BP920173|Adiantum capillus-veneris mRNA, clone: YMU001_...arch programs, Nucleic Acids Res. 25:3389-3402. Query= BP920173|Adiantum capillus

  6. Multi-Step Ka/Ka Dichroic Plate with Rounded Corners for NASA's 34m Beam Waveguide Antenna

    Science.gov (United States)

    Veruttipong, Watt; Khayatian, Behrouz; Hoppe, Daniel; Long, Ezra

    2013-01-01

    A multi-step Ka/Ka dichroic plate Frequency Selective Surface (FSS structure) is designed, manufactured and tested for use in NASA's Deep Space Network (DSN) 34m Beam Waveguide (BWG) antennas. The proposed design allows ease of manufacturing and ability to handle the increased transmit power (reflected off the FSS) of the DSN BWG antennas from 20kW to 100 kW. The dichroic is designed using HFSS and results agree well with measured data considering the manufacturing tolerances that could be achieved on the dichroic.

  7. Multi-Step Ka/Ka Dichroic Plate with Rounded Corners for NASA's 34m Beam Waveguide Antenna

    Science.gov (United States)

    Veruttipong, Watt; Khayatian, Behrouz; Hoppe, Daniel; Long, Ezra

    2013-01-01

    A multi-step Ka/Ka dichroic plate Frequency Selective Surface (FSS structure) is designed, manufactured and tested for use in NASA's Deep Space Network (DSN) 34m Beam Waveguide (BWG) antennas. The proposed design allows ease of manufacturing and ability to handle the increased transmit power (reflected off the FSS) of the DSN BWG antennas from 20kW to 100 kW. The dichroic is designed using HFSS and results agree well with measured data considering the manufacturing tolerances that could be achieved on the dichroic.

  8. Reconstruction of hydrologic responses to late-Glacial (9-33ka) abrupt climate transitions in the coastal southwest United States

    Science.gov (United States)

    Wu, M.; Feakins, S. J.; Kirby, M. E.

    2013-12-01

    A sediment core retrieved from Lake Elsinore, the largest natural freshwater lake in southern California, spans an age of 9 to 33ka BP. The period includes several late-Glacial abrupt climate transitions such as the Heinrich events (HEs) 1-3, the Bølling-Allerød (B-A), and the Younger Dryas (YD). This terrestrial site provides a unique opportunity to evaluate changes in hydrology in coastal southwest United States across these key abrupt climate transition events. Hydrogen isotopic ratios (δDwax) of the long-chain C28 alkanoic acid, a biomarker for terrestrial leaf wax, extracted from the sediments, were analyzed to reveal the δD of precipitation water in the past (δDprecip). In the modern climate, higher δDprecip values are associated with moisture sourced from the tropical Pacific, which brings a drier and warmer climate, whereas lower δDprecip values are associated with moisture sourced from north Pacific brought by polar jet stream, causing a wetter and colder climate. δDwax ranges from about -210‰ to -100‰ between late-Glacial HEs and the beginning of Holocene. The pattern generally correlates with Greenland ice core and regional speleothem records, with lower δDwax values corresponding to colder periods (HEs), and higher δDwax values corresponding to warmer periods (B-A and early Holocene). We infer cold and wet climate with north Pacific sourced moisture during the glacial, followed by gradual warming and drying into the B-A and Holocene, when the moisture sources shifted to the tropical Pacific. There is no substantive response to the YD. The fluctuations of δDwax into and out of the HEs can be as large as about 60‰, suggesting greatly variable hydrology across these late-Glacial abrupt climate transition events. The large shifts in δDwax signal during deglaciation and HEs indicate that hydrology in the coastal southwest US has responded sensitively to climate change, and therefore has important implications for water resources in this

  9. Improvisatsioonilised filmietendus-kontserdid "Kas kino ka saab?"

    Index Scriptorium Estoniae

    2006-01-01

    Eesti Ajaloomuuseumi ja Eesti Film 100 poolt Suurgildi hoones korraldatud koostöönäitust "Elavad ja laulvad pildid" täiendab filmietenduste-kontsertide sari "Kas kino ka saab?", kus täna on kinoklassiku Georges Meliesi (1861-1938) filmiprogramm Jaak Lõhmuse kommenteeriva sõnavõtuga

  10. Che legend elab ka 40 aastat hiljem / Evelyn Kaldoja

    Index Scriptorium Estoniae

    Kaldoja, Evelyn, 1980-

    2007-01-01

    Ilmunud ka: Postimees : na russkom jazõke 9. okt. lk. 10. Argentinas sündinud ja 1967. aastal hukatud revolutsionääri Ernesto Che Guevara poliitikukarjäärist, tema panusest Kuuba revolutsiooni ja poliitikasse. Ernesto Che Guevara mälestamisest Ladina-Ameeerika riikides. Lisa: Kuuba revolutsioon; Che Guevara elu

  11. Additive manufacturing of Ka-band antennas for wireless communications

    DEFF Research Database (Denmark)

    Armendariz, Unai; Rommel, Simon; Rodríguez Páez, Juan Sebastián

    2016-01-01

    This paper presents the design and fabrication of WR-28 waveguide horn antennas operating in the Ka-band frequency range between 26.5 GHz and 40 GHz through 3D printing. Three different antennas are fabricated from polylactide acid filaments in conductive and non-conductive variants; the latter...

  12. Aju rehkendab pingsalt ka unelemise ajal / Tiit Kändler

    Index Scriptorium Estoniae

    Kändler, Tiit, 1948-

    2011-01-01

    Siiani arvati, et kui inimene ei tegutse, siis ei tegutse ka aju. Nüüdseks on selge, et aju on aktiivne alati. Ja matemaatiliste ülesannete lahendamisega seotud ajupiirkonnad on ühed, mis inimese ajus alati valvel püsivad

  13. Eesti Energia emissioonis on koht ka rahvaaktsiatel / Raimo Poom

    Index Scriptorium Estoniae

    Poom, Raimo

    2010-01-01

    Eesti Energia võimaliku aktsiaemissiooni korral tagatakse võimalus soetada aktsiaid ka jaeinvestoritel. Majandus- ja kommunikatsiooniminister Juhan Partsi sõnul tugevdaks see Eesti inimeste huvi energeetika vastu, samuti võimaldaks see paigutada oma sääste Eesti arenguga seotud ettevõttesse

  14. Suhkruturu reform : [ka teiste toiduainete turu reformist] / Ants Laansalu

    Index Scriptorium Estoniae

    Laansalu, Ants, 1938-2011

    2005-01-01

    Ilmunud ka: Agriculture and the development of rural life : overview 2004/2005. - Tallinn, 2005, lk. 83-86. Euroopa Komisjon esitles 2004. a juuli keskel suhkruturu reformikava, mille eesmärgiks on muuta sektor konkurentsivõimelisemaks, turu nõudlustele vastavaks, tarbija- ja keskkonnasõbralikumaks ning lõpetada ületootmine

  15. Eesti Energia emissioonis on koht ka rahvaaktsiatel / Raimo Poom

    Index Scriptorium Estoniae

    Poom, Raimo

    2010-01-01

    Eesti Energia võimaliku aktsiaemissiooni korral tagatakse võimalus soetada aktsiaid ka jaeinvestoritel. Majandus- ja kommunikatsiooniminister Juhan Partsi sõnul tugevdaks see Eesti inimeste huvi energeetika vastu, samuti võimaldaks see paigutada oma sääste Eesti arenguga seotud ettevõttesse

  16. Ehitusala tõus jätkus ka mullu

    Index Scriptorium Estoniae

    2004-01-01

    Ilmunud ka: Delovõje Vedomosti, 3. nov. 2004, lk. 14-15. Ehitusfirmade TOP 95 aastal 2003. Kasumi TOP 40. Käibe TOP 40. TOP-i koostamise metoodika. Kasumi kasvu TOP 20. Käibe kasvu TOP 20. Omakapitali tootluse TOP 20. Rentaabluse TOP 20. Ehitusettevõtete üld- ja finantsandmed

  17. Ottis osales ka ise kahtlases riigihankes / Villy Paimets

    Index Scriptorium Estoniae

    Paimets, Villy, 1972-

    2005-01-01

    AS-i Riigi Kinnisvara juht Tiit Ottis palus 2005. aasta mais keskkriminaalpolitseil algatada Kärdla piirivalvekordoni hangete uurimiseks kriminaalasi. Antud hankel osales ka Ottise loodud AS Gustaf, mis pakkus küll odavaimat hinda, kuid konkursi võitis AS Pameron. Vt. samas: Kriminaalasi algatati teo suhtes

  18. Che legend elab ka 40 aastat hiljem / Evelyn Kaldoja

    Index Scriptorium Estoniae

    Kaldoja, Evelyn, 1980-

    2007-01-01

    Ilmunud ka: Postimees : na russkom jazõke 9. okt. lk. 10. Argentinas sündinud ja 1967. aastal hukatud revolutsionääri Ernesto Che Guevara poliitikukarjäärist, tema panusest Kuuba revolutsiooni ja poliitikasse. Ernesto Che Guevara mälestamisest Ladina-Ameeerika riikides. Lisa: Kuuba revolutsioon; Che Guevara elu

  19. Kas läheb ka Ruudi tapmiseks? / Kati Murutar

    Index Scriptorium Estoniae

    Murutar, Kati, 1967-

    2006-01-01

    Lastefilm "Ruudi" : stsenaristid Katrin Laur, Aare Toikka, Aarne Mägi : režissöör Katrin Laur : nimiosas lapsnäitleja Paul Oskar Soe : Allfilm - MRP Matila Röhr Productions - Schmidtz Katze Filmkollektiv 2006. Võetud kõne alla ka Peeter Simmi "Kõrini!" ja Peeter Urbla "Stiilipeo" arvustaja meelest teenimatult mahategevad retsensioonid

  20. Ehitusala tõus jätkus ka mullu

    Index Scriptorium Estoniae

    2004-01-01

    Ilmunud ka: Delovõje Vedomosti, 3. nov. 2004, lk. 14-15. Ehitusfirmade TOP 95 aastal 2003. Kasumi TOP 40. Käibe TOP 40. TOP-i koostamise metoodika. Kasumi kasvu TOP 20. Käibe kasvu TOP 20. Omakapitali tootluse TOP 20. Rentaabluse TOP 20. Ehitusettevõtete üld- ja finantsandmed

  1. Experimental radio frequency link for Ka-band communications applications

    Science.gov (United States)

    Fujikawa, Gene; Conray, Martin J.; Saunders, Alan L.; Pope, Dale E.

    1988-01-01

    An experimental radio frequency link has been demonstrated to provide two-way communication between a remote user ground terminal and a ground-based Ka-band transponder. Bit-error-rate performance and radio frequency characteristics of the communication link were investigated.

  2. High Througput pKa Prediction Using Semi Empirical Methods

    CERN Document Server

    Jensen, Jan H

    2015-01-01

    A large proportion of organic molecules relevant to medicine and biotechnology contain one or more ionizable groups, which means that fundamental physical and chemical properties (e.g. the charge of the molecule) depend on the pH of the surroundings via the corresponding pKa values of the molecules. As drug- and material design increasingly is being done through high throughput screens, fast - yet accurate - computational pKa prediction methods are becoming crucial to the design process. Current empirical pKa predictors are increasingly found to fail because they are being applied to parts of chemical space for which experimental parameterization data is lacking. We propose to develop a pKa predictor that, due its quantum mechanical foundation, is more generally applicable but still fast enough to be used in high throughput screening. The method has the potential to impact virtually any biotechnological design process involving organic molecules as we will demonstrate for metabolic engineering and organic bat...

  3. Tõnu Talve "Ka" tuuritab Kadrinas ja Rakveres / Ants Juske

    Index Scriptorium Estoniae

    Juske, Ants, 1956-

    2005-01-01

    Tõnu Talve maalidest. Kadrinas esitatud trio Fragile performance'st ja näitusest tsüklist "Ka" Rakveres. Rakvere näitusel Teele Tuuna ja kolmeaastase tütre Anneliise tööd. Trio Fragile koosseisus on kitarrist Robert Jürjendal, trummar Arvo Urb ja maalija Tõnu Talve

  4. Holland soovib Maailmapanga juhi kohale ka teisi kandidaate / Kalev Vilgats

    Index Scriptorium Estoniae

    Vilgats, Kalev

    2005-01-01

    USA president George W. Bush nimetas Iraagi sõja peamise planeerija Paul Wolfowitzi Maailmapanga presidendi kandidaadiks. See valik on Euroopas põhjustanud vastuolusid, kuna temast kardetakse Bushi senise välispoliitilise stiili jätkajat ka Maailmapangas. Bill Clintonit peetakse üheks võimalikuks kandidaadiks ÜRO peasekräri kohale

  5. Improvisatsioonilised filmietendus-kontserdid "Kas kino ka saab?"

    Index Scriptorium Estoniae

    2006-01-01

    Eesti Ajaloomuuseumi ja Eesti Film 100 poolt Suurgildi hoones korraldatud koostöönäitust "Elavad ja laulvad pildid" täiendab filmietenduste-kontsertide sari "Kas kino ka saab?", kus täna on kinoklassiku Georges Meliesi (1861-1938) filmiprogramm Jaak Lõhmuse kommenteeriva sõnavõtuga

  6. Abrupt Atmospheric Methane Increases Associated With Hudson Strait Heinrich Events

    Science.gov (United States)

    Rhodes, R.; Brook, E.; Chiang, J. C. H.; Blunier, T.; Maselli, O. J.; McConnell, J. R.; Romanini, D.; Severinghaus, J. P.

    2015-12-01

    The drivers of abrupt climate change during the Last Glacial Period are not well understood. While Dansgaard-Oeschger (DO) cycles are thought to be linked to variations in the strength of the Atlantic Meridional Ocean Circulation (AMOC), it is not clear how or if Heinrich Events—extensive influxes of icebergs into the North Atlantic Ocean that impacted global climate and biogeochemistry—are related. An enduring problem is the difficultly in dating iceberg rafted debris deposits that typically lack foraminifera. Here we present an ultra-high resolution record of methane from the West Antarctic Ice Sheet Divide ice core at unprecedented, continuous temporal resolution from 67.2-9.8 ka BP, which we propose constrains the timing of Heinrich events. Our methane record essentially mirrors Greenland ice core stable isotope variability across D-O events, except during Heinrich stadials 1, 2, 4 and 5. Partway through these stadials only, methane increases abruptly and rapidly, as at the onset of a D-O event but Greenland temperature exhibits no equivalent response. Speleothem records exhibit signatures of drought in the Northern extra-tropics and intensified monsoonal activity over South America at these times. We use a simple heuristic model to propose that cold air temperatures and extensive sea ice in the North, resulting from Heinrich events, caused extreme reorganization of tropical hydroclimate. This involved curtailment of the seasonal northerly migration of tropical rain belts, leading to intensification of rainfall over Southern Hemisphere tropical wetlands, thus allowing production of excess methane relative to a 'normal' Greenland stadial. We note that this mechanism can operate if AMOC is already in a slowed state when a Heinrich event occurs, as paleo-evidence suggests it was. Heinrich events and associated sea ice cover would therefore act to prolong the duration of this AMOC state. Our findings place the big four Heinrich events of Hudson Strait origin

  7. The Geomagnetic Field Recorded in Sediments of the Tuzla Section (the Krasnodar Territory, Russia) over the Time Interval 120-70 ka

    DEFF Research Database (Denmark)

    Pilipenko, Olga; Abrahamsen, N.; Trubikhin, V. M.

    2007-01-01

    of the variation in the geomagnetic field inclination reveal an anomalous direction dated at ~110 ka which coincides with a similar anomalous direction in the Eltigen section (Ukraine) correlating with the Blake paleomagnetic event. The significant correlation between the time series NRM0.015/SIRM0.015 (Tuzla...

  8. Aspartate embedding depth affects pHLIP's insertion pKa.

    Science.gov (United States)

    Fendos, Justin; Barrera, Francisco N; Engelman, Donald M

    2013-07-09

    We have used the pHlow insertion peptide (pHLIP) family to study the role of aspartate embedding depth in pH-dependent transmembrane peptide insertion. pHLIP binds to the surface of a lipid bilayer as a largely unstructured monomer at neutral pH. When the pH is lowered, pHLIP inserts spontaneously across the membrane as a spanning α-helix. pHLIP insertion is reversible when the pH is adjusted back to a neutral value. One of the critical events facilitating pHLIP insertion is the protonation of aspartates in the spanning domain of the peptide: the negative side chains of these residues convert to uncharged, polar forms, facilitating insertion by altering the hydrophobicity of the spanning domain. To examine this protonation mechanism further, we created pHLIP sequence variants in which the two spanning aspartates (D14 and D25) were moved up or down in the sequence. We hypothesized that the aspartate depth in the inserted state would directly affect the proton affinity of the acidic side chains, altering the pKa of pH-dependent insertion. To this end, we also mutated the arginine at position 11 to determine whether arginine snorkeling modulates the insertion pKa by affecting the aspartate depth. Our results indicate that both types of mutations change the insertion pKa, supporting the idea that the aspartate depth is a participating parameter in determining the pH dependence. We also show that pHLIP's resistance to aggregation can be altered with our mutations, identifying a new criterion for improving the performance of pHLIP in vivo when targeting acidic disease tissues such as cancer and inflammation.

  9. The closure of Pak1-dependent macropinosomes requires the phosphorylation of CtBP1/BARS

    OpenAIRE

    Liberali, Prisca; Kakkonen, Elina; Turacchio, Gabriele; Valente, Carmen; Spaar, Alexander; Perinetti, Giuseppe; Böckmann, Rainer A.; Corda, Daniela; Colanzi, Antonino; Marjomaki, Varpu; Luini, Alberto

    2008-01-01

    Membrane fission is an essential process in membrane trafficking and other cellular functions. While many fissioning and trafficking steps are mediated by the large GTPase dynamin, some fission events are dynamin independent and involve C-terminal-binding protein-1/brefeldinA-ADP ribosylated substrate (CtBP1/BARS). To gain an insight into the molecular mechanisms of CtBP1/BARS in fission, we have studied the role of this protein in macropinocytosis, a dynamin-independent endocytic pathway tha...

  10. The new Ford Ka: a design for the future; Der neue Ford Ka: Ein Konzept fuer die Zukunftt

    Energy Technology Data Exchange (ETDEWEB)

    Becker, K.; Bietz, T.; Castro, P.; Cole, S.; Jansen, K.H.; McColm, A.

    1996-09-01

    One of the factors of success in the competitive world of today`s automotive industry is the ability to adapt quickly to changing customer requirements. Surveys in all European countries indicate an increasing demand for cars that are below the established small cars in terms of size and price. Ford is offering with the new Ford Ka a product in the Sub-B class, which gains new ground by a fascinating design as well as matches the B-class for safety and noise comfort. The Ka is fun-to-drive with lively, safe handling to `best in class` standard at an outstanding price/performance ratio. (orig.) [Deutsch] Befragungen in ganz Europa signalisieren einen steigenden Bedarf an Fahrzeugen, die in Groesse und Preis unterhalb der etablierten Kleinwagen positioniert sind. Ford bietet mit dem neuen Ka in der Sub-B-Klasse ein Produkt, das nicht nur durch wegweisendes Design besticht, sondern gleichzeitig Fahrvergnuegen durch agiles und sicheres Handling garantiert. Der Ka bietet Sicherheit und Geraeuschkomfort auf dem Niveau der naechsthoeheren Klasse und dies bei einem guten Preis-Leistungsverhaeltnis. (orig.)

  11. The 15q11.2 BP1–BP2 Microdeletion Syndrome: A Review

    Directory of Open Access Journals (Sweden)

    Devin M. Cox

    2015-02-01

    Full Text Available Patients with the 15q11.2 BP1–BP2 microdeletion can present with developmental and language delay, neurobehavioral disturbances and psychiatric problems. Autism, seizures, schizophrenia and mild dysmorphic features are less commonly seen. The 15q11.2 BP1–BP2 microdeletion involving four genes (i.e., TUBGCP5, CYFIP1, NIPA1, NIPA2 is emerging as a recognized syndrome with a prevalence ranging from 0.57%–1.27% of patients presenting for microarray analysis which is a two to four fold increase compared with controls. Review of clinical features from about 200 individuals were grouped into five categories and included developmental (73% and speech (67% delays; dysmorphic ears (46% and palatal anomalies (46%; writing (60% and reading (57% difficulties, memory problems (60% and verbal IQ scores ≤75 (50%; general behavioral problems, unspecified (55% and abnormal brain imaging (43%. Other clinical features noted but not considered as common were seizures/epilepsy (26%, autism spectrum disorder (27%, attention deficit disorder (ADD/attention deficit hyperactivity disorder (ADHD (35%, schizophrenia/paranoid psychosis (20% and motor delay (42%. Not all individuals with the deletion are clinically affected, yet the collection of findings appear to share biological pathways and presumed genetic mechanisms. Neuropsychiatric and behavior disturbances and mild dysmorphic features are associated with genomic imbalances of the 15q11.2 BP1–BP2 region, including microdeletions, but with an apparent incomplete penetrance and variable expressivity.

  12. The quantitative reconstruction of the palaeoclimate between 5200 and 4300 cal yr BP in the Tianshui Basin, NW China

    Directory of Open Access Journals (Sweden)

    N. Sun

    2012-03-01

    Full Text Available The quantitative reconstruction of the palaeoclimate is a prerequisite for understanding climate processes at time scales of centuries and millennia. Here, the coexistence approach (CA was applied to reconstruct climatic factors quantitatively based on the fossil charcoal records between 5200 and 4300 cal yr BP in the Tianshui Basin, NW China. The CA analysis showed that the climate of the Tianshui Basin belonged to the northern subtropical zone between 5200 and 4300 cal yr BP. The mean annual temperature (MAT was approximately 13.2 °C, and the mean annual precipitation (MAP was approximately 778 mm between 5200 and 4900 cal yr BP. The MAT was approximately 13.2 °C, and the MAP was approximately 688 mm between 4800 and 4300 cal yr BP. The MAT was approximately 2.2 °C higher than today, and the MAP was approximately 280 mm higher than today from 5200 to 4900 cal yr BP. The MAT was also approximately 2.2 °C higher than today from 4800 to 4300 cal yr BP, while the MAP was approximately 196 mm higher than today. No abrupt cold event occurred between 5200 and 4300 cal yr BP; however, a drought tendency appeared after around 4800 cal yr BP.

  13. Oxygen-dependent acetylation and dimerization of the corepressor CtBP2 in neural stem cells

    Energy Technology Data Exchange (ETDEWEB)

    Karaca, Esra; Lewicki, Jakub; Hermanson, Ola, E-mail: Ola.Hermanson@ki.se

    2015-03-01

    The transcriptional corepressor CtBP2 is essential for proper development of the nervous system. The factor exerts its repression by interacting in complexes with chromatin-modifying factors such as histone deacetylases (HDAC) 1/2 and the histone demethylase LSD1/KDM1. Notably, the histone acetyl transferase p300 acetylates CtBP2 and this is an important regulatory event of the activity and subcellular localization of the protein. We recently demonstrated an essential role for CtBPs as sensors of microenvironmental oxygen levels influencing the differentiation potential of neural stem cells (NSCs), but it is not known whether oxygen levels influence the acetylation levels of CtBP factors. Here we show by using proximity ligation assay (PLA) that CtBP2 acetylation levels increased significantly in undifferentiated, proliferating NSCs under hypoxic conditions. CtBP2 interacted with the class III HDAC Sirt1 but this interaction was unaltered in hypoxic conditions, and treatment with the Sirt1 inhibitor Ex527 did not result in any significant change in total CtBP2 acetylation levels. Instead, we revealed a significant decrease in PLA signal representing CtBP2 dimerization in NSCs under hypoxic conditions, negatively correlating with the acetylation levels. Our results suggest that microenvironmental oxygen levels influence the dimerization and acetylation levels, and thereby the activity, of CtBP2 in proliferating NSCs.

  14. Mars Global Surveyor Ka-Band Frequency Data Analysis

    Science.gov (United States)

    Morabito, D.; Butman, S.; Shambayati, S.

    2000-01-01

    The Mars Global Surveyor (MGS) spacecraft, launched on November 7, 1996, carries an experimental space-to-ground telecommunications link at Ka-band (32 GHz) along with the primary X-band (8.4 GHz) downlink. The signals are simultaneously transmitted from a 1.5-in diameter parabolic high gain antenna (HGA) on MGS and received by a beam-waveguide (BWG) R&D 34-meter antenna located in NASA's Goldstone Deep Space Network (DSN) complex near Barstow, California. The projected 5-dB link advantage of Ka-band relative to X-band was confirmed in previous reports using measurements of MGS signal strength data acquired during the first two years of the link experiment from December 1996 to December 1998. Analysis of X-band and Ka-band frequency data and difference frequency (fx-fka)/3.8 data will be presented here. On board the spacecraft, a low-power sample of the X-band downlink from the transponder is upconverted to 32 GHz, the Ka-band frequency, amplified to I-W using a Solid State Power Amplifier, and radiated from the dual X/Ka HGA. The X-band signal is amplified by one of two 25 W TWTAs. An upconverter first downconverts the 8.42 GHz X-band signal to 8 GHz and then multiplies using a X4 multiplier producing the 32 GHz Ka-band frequency. The frequency source selection is performed by an RF switch which can be commanded to select a VCO (Voltage Controlled Oscillator) or USO (Ultra-Stable Oscillator) reference. The Ka-band frequency can be either coherent with the X-band downlink reference or a hybrid combination of the USO and VCO derived frequencies. The data in this study were chosen such that the Ka-band signal is purely coherent with the X-band signal, that is the downconverter is driven by the same frequency source as the X-band downlink). The ground station used to acquire the data is DSS-13, a 34-meter BWG antenna which incorporates a series of mirrors inside beam waveguide tubes which guide the energy to a subterranean pedestal room, providing a stable environment

  15. Event Management

    OpenAIRE

    Havlenová, Tereza

    2016-01-01

    Event is an experience that is perceived by all the senses. Event management is a process involving the various activities that are assigned to staffers. Organizing special events became an individual field. If the manager understand the events as a communication platform gets into the hands of a modern, multifunctional and very impressive tool. The procedure to implement a successful event in a particular area is part of this work. The first part explains the issues of event management on th...

  16. Ka-band and X-band observations of the solar corona acquired during the Cassini 2001 superior conjunction

    Science.gov (United States)

    Morabito, D. D.

    2002-01-01

    Simultaneous dual-frequency Ka-band (32 GHz) and X-band (8.4 GHz) carrier signal data have been acquired during the superior conjunction of the Cassini spacecraft June 2001, using the NASA Deep Space Network's facilities located in Goldstone, California. The solar elongation angle of the observations varied from -4.1 degrees (-16 solar radii) to -0.6 degrees (-2.3 solar radii). The observed coronal and solar effects on the signals include spectral broadening, amplitude scintillation, phase scintillation, and increased noise. The measurements were generally consistent with existing solar models, except during solar transient events when the signatures of the measurements were observed to increase significantly above the quiet background levels. This is the second solar conjunction of Cassini for which simultaneous X/Ka data were acquired. Both solar conjunctions, conducted in May 2000 and June 2001, occurred near the peak of the current 11 year solar cycle.

  17. 13 kA Superconducting Busbars Manufacturing Process

    CERN Document Server

    Principe, R; Fornasiere, E

    2012-01-01

    In the LHC, the superconducting Main Bending magnets and Quadrupole magnets are series-connected electrically in different excitation circuits by means of superconducting busbars, carrying a maximum current of 13 kA. These superconducting busbars consist of a superconducting Rutherford cable thermally and electrically coupled to a copper section all along the length. The function of the copper section is essentially to provide an alternative path for the magnet current in case of resistive transition. The production of these components was originally outsourced. The decision to import the technology at CERN led to a global re-engineering of the standard process. Although based on the procedures adopted during the LHC construction, a few modifications and improvements have been implemented, profiting of the experience gained in the last few years. This document details the manufacturing process of the 13 kA busbars as it is actually performed at CERN, emphasizing the new solutions adopted during the first mon...

  18. NOVEL MLANTJARAN KA SASAK: FROM DILLEMATIC TEACHERS TO HUMOROUS ONES

    Directory of Open Access Journals (Sweden)

    I Nyoman Tingkat

    2015-07-01

    Full Text Available This article discusses the representation of the image of teachers in the novel entitled Mlantjaran ka Sasak written by Gde Srawana. Using the theory of literary sociology and the theory of representation as the basis of analysis, it was found that teachers were  imaged of being dilemmatic, humanistic idealistic, caring about the Balinese culture, and being humorous. Sociologically, the novel entitled Mlantjaran ka Sasak pictured the life background of the Balinese society during 1930s, indicated by the critical attitude of the intellectuals through I Made Sarati and Ida Ayu Priya, the characters who played a role as teachers, towards the caste feudalism in marriage. Such a critical attitude was expressed in such an inciting way that the ethic and aesthetic values needed to educate society were not neglected.

  19. Late Pleistocene/Holocene wetland events recorded in southeast Tengger Desert lake sediments, NW China

    Institute of Scientific and Technical Information of China (English)

    D. B. Madsen; CHEN Fahu; Ch. G. Oviatt; ZHU Yan; P. J. Brantingham; R. G. Elston; R. L. Bettinger

    2003-01-01

    The area along the eastern and southeastern margins of the Tengger Desert, NW China, which is sensitive to the summer monsoon variations, was selectedfor studying the environmental conditions surrounding the transition between Paleolithic foragers and Neolithic farmer/pastoral- ists. Short cores were obtained from four lake basins in the southwestern Tengger using a hand-driven piston coring device. Proxies from these cores were supplemented by ra- diocarbon ages obtained from lake sediment cores, shoreline features and spring mound deposits. Together these records provide evidence of millennial-scale climate change events from the Pleistocene-Holocene transition to the present. Lake/wetland events, representing periods of more intensive summer monsoon, occur in the records at ~12.7-11.6, ~10.1, ~9.3, ~8.0, ~5.4, ~1.5, and ~0.8 ka BP. They do suggest that century- to millennial-scale climatic cycles are characteristic of the Holocene in the southeastern Tengger Desert although the chronology must be considered extremely tentative.

  20. Anatomically modern human in Southeast Asia (Laos) by 46 ka

    OpenAIRE

    Demeter, Fabrice; Shackelford, Laura L.; Bacon, Anne-Marie; Duringer, Philippe; Westaway, Kira; Sayavongkhamdy, Thongsa; Braga, José; Sichanthongtip, Phonephanh; Khamdalavong, Phimmasaeng; Ponche, Jean-Luc; wang, Hong; Lundstrom, Craig; Patole-Edoumba, Elise; Karpoff, Anne-marie

    2012-01-01

    Uncertainties surround the timing of modern human emergence and occupation in East and Southeast Asia. Although genetic and archeological data indicate a rapid migration out of Africa and into Southeast Asia by at least 60 ka, mainland Southeast Asia is notable for its absence of fossil evidence for early modern human occupation. Here we report on a modern human cranium from Tam Pa Ling, Laos, which was recovered from a secure stratigraphic context. Radiocarbon and luminescence dating of the ...

  1. Riigikogus tehakse ka tööd / Vilja Savisaar

    Index Scriptorium Estoniae

    Savisaar, Vilja, 1962-

    2007-01-01

    Ilmunud ka: Sakala, 13. juuni 2007, lk. 2; Lääne Elu, 14. juuni 2007, lk. 2; Põhjarannik, 14. juuni 2007, lk. 2; Severnoje Poberezhje, 14. juuni 2007, lk. 2; Vooremaa, 14. juuni 2007, lk. 2; Harju Ekspress, 15. juuni 2007, lk. 8; Järva Teataja, 16. juuni 2007, lk. 2; Koit, 21. juuni 2007, lk. 6. Parlamendiliige Keskerakonna fraktsiooni poolt parlamendis algatatud eelnõudest

  2. Kui suudab Steve, suudab ka Apple / Tarvo Vaarmets

    Index Scriptorium Estoniae

    Vaarmets, Tarvo

    2008-01-01

    Ehkki Apple'i kolmanda kvartali kasum kasvas kolmandiku võrra ja oli oodatust kümnendiku jagu suurem, langes ettevõtte aktsia hind börsil. Investoreid teeb rahutuks nii ettevõtte juhi Steve Jobsi tervis kui ka Apple'i majandusprognoos neljandaks kvartaliks. Lisa: Analüütikud on aktsia suhtes üksmeelel. Diagramm: Aktsia hinnal taas suund alla

  3. Euroopa Liit toetab ka väiketalupidajaid / Rein Aidma

    Index Scriptorium Estoniae

    Aidma, Rein, 1950-

    2003-01-01

    Ilmunud ka: Vali Uudised 12. nov. lk. 4, Harjumaa, Hiiu Leht, Sakala 14. nov. lk. 3,2,2, Koit 18. nov. lk. 6, Põhjarannik, Severnoje Poberezhje 21. nov. lk. 4, Järva Teataja 25. nov. lk. 2. Väiksematel põllumajandusega tegelevatel ettevõtetel on võimalus saada ajutist abi paremaks toimetulekuks võimalike muutuste korral, mis leiavad aset liitumisjärgsel perioodil

  4. Ka omavalitsus vastutab palkade eest / Aivar Õun

    Index Scriptorium Estoniae

    Õun, Aivar, 1959-

    2003-01-01

    Ilmunud ka: Nädaline, Koit 11. nov. lk.4,6, Põhjarannik, Severnoje Poberezhje, Hiiumaa, Järva Teataja 11. nov. lk. 2, Pärnu Postimees 12. nov. lk. 15, Vali Uudised 14. nov. lk. 2, Valgamaalane 18. nov. lk. 2, Vooremaa 25. nov. lk. 2. Kohalike omavalitsuste võimalustest õpetajate ja kultuuritöötajate palkade täiendavaks tõstmiseks 2004. aastal

  5. Riigikogus tehakse ka tööd / Vilja Savisaar

    Index Scriptorium Estoniae

    Savisaar, Vilja, 1962-

    2007-01-01

    Ilmunud ka: Sakala, 13. juuni 2007, lk. 2; Lääne Elu, 14. juuni 2007, lk. 2; Põhjarannik, 14. juuni 2007, lk. 2; Severnoje Poberezhje, 14. juuni 2007, lk. 2; Vooremaa, 14. juuni 2007, lk. 2; Harju Ekspress, 15. juuni 2007, lk. 8; Järva Teataja, 16. juuni 2007, lk. 2; Koit, 21. juuni 2007, lk. 6. Parlamendiliige Keskerakonna fraktsiooni poolt parlamendis algatatud eelnõudest

  6. Ka omavalitsus vastutab palkade eest / Aivar Õun

    Index Scriptorium Estoniae

    Õun, Aivar, 1959-

    2003-01-01

    Ilmunud ka: Nädaline, Koit 11. nov. lk.4,6, Põhjarannik, Severnoje Poberezhje, Hiiumaa, Järva Teataja 11. nov. lk. 2, Pärnu Postimees 12. nov. lk. 15, Vali Uudised 14. nov. lk. 2, Valgamaalane 18. nov. lk. 2, Vooremaa 25. nov. lk. 2. Kohalike omavalitsuste võimalustest õpetajate ja kultuuritöötajate palkade täiendavaks tõstmiseks 2004. aastal

  7. Eestil on Euroopas ka oma tee / Jürgen Ligi

    Index Scriptorium Estoniae

    Ligi, Jürgen, 1959-

    2004-01-01

    Ilmunud ka: Põhjarannik, 17. apr. 2004, lk. 2; Severnoje Poberezhje, 17. apr. 2004, lk. 2; Koit,17. apr. 2004, lk. 6; Meie Maa, 17. apr. 2004, lk. 2; Hiiu Leht, 20. apr. 2004, lk. 2; Virumaa Nädalaleht, 23. apr. 2004, lk. 2; Sakala, 23. apr. 2004, lk. 2; Valgamaalane, 8. mai 2004, lk. 2. Maksu- ja sotsiaalpoliitika otsustusõigusest ning kaitsmisest EL-i riikides

  8. Kui suudab Steve, suudab ka Apple / Tarvo Vaarmets

    Index Scriptorium Estoniae

    Vaarmets, Tarvo

    2008-01-01

    Ehkki Apple'i kolmanda kvartali kasum kasvas kolmandiku võrra ja oli oodatust kümnendiku jagu suurem, langes ettevõtte aktsia hind börsil. Investoreid teeb rahutuks nii ettevõtte juhi Steve Jobsi tervis kui ka Apple'i majandusprognoos neljandaks kvartaliks. Lisa: Analüütikud on aktsia suhtes üksmeelel. Diagramm: Aktsia hinnal taas suund alla

  9. Socialization as a factor of influence on the satisfaction of participants of the Fruška gora mountaineering marathon

    Directory of Open Access Journals (Sweden)

    Marković Jelica

    2015-01-01

    Full Text Available Customer satisfaction is a guarantee of success in all fields, including those related to the organization of sport events. As a consequence of the event quality appears visitor satisfaction which significantly impacts on the their loyalty and 'word of mouth' promotion, so examination of these categories is especially important to the event organizers in order to control and improve the event. Sports events can be viewed in a broader context, where it is not of primary importance reaching the sports results, but is more emphasized its non-competitive nature. In this case, the sport events include recreation, relaxation, entertainment and leisure, with a significantly different approach and intentions of the organization. Such events lead to intercultural exchange, increase the level of socialization and promote physical activity as a function of improving health. Having in mind that it assumed the characteristics of mass and has become an influential factor in the Vojvodina tourism, this study aims to analyze the quality of the Mountaineering marathon on Fruška gora from the perspective of the participants' satisfaction. For collecting the data, it was used the questionnaire. The sample included 134 participants of the 35th Mountaineering marathon on Fruška gora. For measuring this event quality, it was used modified model SEQSS with 4 dimensions: quality of marathon program, quality of interaction, quality of outcomes and quality of the physical environment. The results have shown that the quality of all measured dimensions is at a high level and that measuring dimension the quality outcome, which includes the socialization and valence, has the greatest impact on the satisfaction of the participants.

  10. Precision Deployable Mast for the SWOT KaRIn Instrument Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Design and prototype a lightweight, precision-deployable mast for the Ka-band Radar Interferometer (KaRIn) antennas in the Surface Water and Ocean Topography (SWOT)...

  11. Air Monitoring Data for BP Spill/Deepwater Horizon

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Deepwater Horizon oil spill (also referred to as the BP oil spill) began on 20 April 2010 in the Gulf of Mexico on the BP-operated Macondo Prospect. Following...

  12. Air Sampling Data for BP Spill/Deepwater Horizon

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Deepwater Horizon oil spill (also referred to as the BP oil spill) began on 20 April 2010 in the Gulf of Mexico on the BP-operated Macondo Prospect. Following...

  13. Waste Sampling Data for BP Spill/Deepwater Horizon

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Deepwater Horizon oil spill (also referred to as the BP oil spill) began on 20 April 2010 in the Gulf of Mexico on the BP-operated Macondo Prospect. Following...

  14. Water Sampling Data for BP Spill/Deepwater Horizon

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Deepwater Horizon oil spill (also referred to as the BP oil spill) began on 20 April 2010 in the Gulf of Mexico on the BP-operated Macondo Prospect. Following...

  15. Sediment Sampling Data for BP Spill/Deepwater Horizon

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Deepwater Horizon oil spill (also referred to as the BP oil spill) began on 20 April 2010 in the Gulf of Mexico on the BP-operated Macondo Prospect. Following...

  16. Surface Water Sampling Data for BP Spill/Deepwater Horizon

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Deepwater Horizon oil spill (also referred to as the BP oil spill) began on 20 April 2010 in the Gulf of Mexico on the BP-operated Macondo Prospect. Following...

  17. Use of Roud Wood in Kaingáng Houses

    Directory of Open Access Journals (Sweden)

    Ricardo Dias Silva

    2002-01-01

    Full Text Available This work has the purpose of describing and analyzing the evolutionary habitation process of the Kaingáng. Its main focus is the typological reading of the shelters as well as the registration of the wooden building system used in the construction of the houses in the “Äpucaraninha” Reserve, located in a district of Londrina. The research proceeds with the elaboration of the genealogy of the kaingáng’s habitation through the consultation to the published historical reports and their chronological organization. The data collection within the group was accomplished through informal interviews, photographic survey and in loco observations. Aspects related to the use of the round wood as well as the other elements that are part of the construction, were verified at this stage. The raw material used in every building system is obtained in the Reserve itself, being the wood used not only in the structure but also in the sealing. The connections are made through fittings and fastenings with liana. In spite of the mixture of values and meanings that the Kaingáng community experiences through the contact with other cultures, traditional aspects related to the building of the “traditional house” are preserved, with no domain of other techniques by most of the group. The registration intends to contribute towards the identification and understanding of important issues related to the spaces built by the man.

  18. Rain Fade Compensation Alternatives for Ka Band Communication Satellites

    Science.gov (United States)

    Acosta, Roberto J.

    1997-01-01

    Future satellite communications systems operating in Ka-band frequency band are subject to degradation produced by the troposphere which is much more severe than those found at lower frequency bands. These impairments include signal absorption by rain, clouds and gases, and amplitude scintillation's arising from refractive index irregularities. For example, rain attenuation at 20 GHz is almost three times that at 11 GHz. Although some of these impairments can be overcome by oversizing the ground station antennas and high power amplifiers, the current trend is using small (less than 20 inches apertures), low-cost ground stations (less than $1000) that can be easily deployed at user premises. As a consequence, most Ka-band systems are expected to employ different forms of fade mitigation that can be implemented relatively easily and at modest cost. The rain fade mitigation approaches are defined by three types of Ka-band communications systems - a low service rate (less than 1.5 Mb/s), a moderate service rate (1.5 to 6 Mb/s) system and a high service rate (greater than 43 Mb/s) system. The ACTS VSAT network, which includes an adaptive rain fade technique, is an example of a moderate service rate.

  19. ATLAS computing operations within the GridKa Cloud

    Energy Technology Data Exchange (ETDEWEB)

    Kennedy, J; Walker, R [LMU Munich (Germany); Olszewski, A [Institute of Nuclear Physics Krakow (Poland); Nderitu, S [University of Bonn (Germany); Serfon, C; Duckeck, G

    2010-04-01

    The organisation and operations model of the ATLAS T1-T2 federation/Cloud associated to the GridKa T1 in Karlsruhe is described. Attention is paid to Cloud level services and the experience gained during the last years of operation. The ATLAS GridKa Cloud is large and divers spanning 5 countries, 2 ROC's and is currently comprised of 13 core sites. A well defined and tested operations model in such a Cloud is of the utmost importance. We have defined the core Cloud services required by the ATLAS experiment and ensured that they are performed in a managed and sustainable manner. Services such as Distributed Data Management involving data replication,deletion and consistency checks, Monte Carlo Production, software installation and data reprocessing are described in greater detail. In addition to providing these central services we have undertaken several Cloud level stress tests and developed monitoring tools to aid with Cloud diagnostics. Furthermore we have defined good channels of communication between ATLAS, the T1 and the T2's and have pro-active contributions from the T2 manpower. A brief introduction to the GridKa Cloud is provided followed by a more detailed discussion of the operations model and ATLAS services within the Cloud.

  20. Utjecaj materijala za pakiranje na kvalitetu Kačkavalja

    Directory of Open Access Journals (Sweden)

    Goce Talevski

    2017-02-01

    Full Text Available U ovom radu ispitivan je utjecaj različitog ambalažnog materijala (A - kontrolni uzorak, B - polimerna emulzija, C - vosak i D - polimerna folija na kvalitetu Kačkavalja. Najnižu pH vrijednost imao je uzorak zaštićen voskom, što je rezultat zadržavanja nastalih organskih kiselina i plinova od strane ambalažnog materijala. Statistički značajan utjecaj ambalažnih materijala (p<0.01 bio je utvrđen kod sadržaja suhe tvari, proteina i pepela, dok statistička značajnost nije bila utvrđena kod sadržaja masti kod Kačkavalja. Proteolitički procesi bili su izraženiji kod uzorka zaštićenog voskom i polimernom folijom, s višim razinama topljivog dušika, primarnih i sekundarnih dušičnih spojeva i koeficijenta zrelosti u odnosu na kontrolni uzorak i uzorak zaštićen polimernom emulzijom.

  1. Land surface temperature changes in Northern Iberia since 4000 yr BP, based on δ13C of speleothems

    Science.gov (United States)

    Martín-Chivelet, Javier; Muñoz-García, M. Belén; Edwards, R. Lawrence; Turrero, María J.; Ortega, Ana I.

    2011-05-01

    The surface temperature changes for the last 4000 years in northern inland Iberia (an area particularly sensitive to climate change) are determined by a high resolution study of carbon stable isotope records of stalagmites from three caves (Kaite, Cueva del Cobre, and Cueva Mayor) separated several tens of kilometers away in N Spain. Despite the local conditions of each cave, the isotopic series show a good overall coherence, and resulted to be strongly sensitive to surface temperature changes. The record reflects alternating warmer and colder intervals, always within a temperature range of 1.6 °C. The timing and duration of the intervals were provided by 43 230Th- 234U (ICP-MS) ages. Main climatic recognized periods are: (1) 3950-3000 yr BP: warm period punctuated by cool events around ~ 3950, 3550 and 3250 yr BP; (2) 2850-2500 yr BP cold interval (Iron Age Cold Period); (3) 2500-1650 yr BP moderate warm period (Roman Warm Period), with maximum temperatures between 2150 and 1750 yr BP; (4) 1650-1350 yr BP cold interval (Dark Ages Cold Period), with a thermal minimum at ~ 1500 yr BP; (5) 1350-750 yr BP warm period (Medieval Warm Period) punctuated by two cooler events at ~ 1250 and ~ 850 yr BP; (6) 750-100 yr BP cold period (Little Ice Age) with extremes occurring at 600-500 yr BP, 350-300 yr BP, and 150-100 yr BP; and (7) the last 150 years, characterized by rapid but no linear warming (Modern Warming). Remarkably, the presented records allow direct comparison of recent warming with former warm intervals such as the Roman or the Medieval periods. That comparison reveals the 20th century as the time with highest surface temperatures of the last 4000 years for the studied area. Spectral analysis of the time series shows consistent climatic cycles of ~ 400, ~ 900 and ~ 1300 yr, comparable with those recognized in the North Atlantic marine record, the Greenland ice cores, and other terrestrial records for the middle-late Holocene, suggesting common climate forcing

  2. Components of the CtBP1/BARS-dependent fission machinery.

    Science.gov (United States)

    Valente, Carmen; Luini, Alberto; Corda, Daniela

    2013-10-01

    The brefeldin A ADP-ribosylated substrate, a member of the C-terminal-binding protein family that is referred to as CtBP1/BARS, is a dual-function protein that acts as a transcriptional co-repressor in the nucleus and as an inducer of membrane fission in the cytoplasm. In this review, we first discuss the mechanisms that enable CtBP1/BARS to shift between the nuclear transcriptional co-repressor and the cytosolic fission-inducing activities. Then, we focus on the role of CtBP1/BARS in membrane fission. CtBP1/BARS controls several fission events including macropinocytosis, fluid-phase endocytosis, COPI-coated vesicle formation, basolaterally directed post-Golgi carrier formation, and Golgi partitioning in mitosis. We report on recent advances in our understanding of the CtBP1/BARS membrane fission machineries that operate at the trans-side and at the cis-side of the Golgi complex. Specifically, we discuss how these machineries are assembled and regulated, and how they operate in the formation of the basolaterally directed post-Golgi carriers.

  3. Event marketing

    OpenAIRE

    Novotná, Michaela

    2008-01-01

    This study aims to analyze event-marketing activities of the small firm and propose new events. At first the theoretical part describes marketing and communication mix and then especially planning and development of event marketing campaign. Research data were collected by the method of survey to propose the new events. Randomly selected customers were asked to fill the questionnaire. Its results were integrated into the proposal of the new events. The interview was realized with the owner of...

  4. Long-term monitoring of Sgr A* at 7 mm with VERA and KaVA

    CERN Document Server

    Akiyama, Kazunori; Sohn, Bong Won; Lee, Sang Sung; Trippe, Sascha; Honma, Mareki

    2013-01-01

    We present the results of radio monitoring observations of Sgr A* at 7 mm (i.e. 43 GHz) with VLBI Exploration of Radio Astrometry (VERA), which is a VLBI array in Japan. VERA provides angular resolutions on millisecond scales, resolving structure within ~100 Schwarzschild radii of Sgr A* similar to Very Large Baseline Array (VLBA). We performed multi-epoch observations of Sgr A* in 2005 - 2008, and started monitoring it again with VERA from January 2013 for tracing the current G2 encounter event. Our preliminary results in 2013 show that Sgr A* on mas scales has been in ordinary state as of August 2013, although some fraction of the G2 cloud already passed pericenter of Sgr A* in April 2013. We will continue on monitoring Sgr A* with VERA and newly developed KaVA (KVN and VERA Array).

  5. Climatic variations in the past 140 ka recorded in core RM, east Qinghai-Xizang Plateau

    Institute of Scientific and Technical Information of China (English)

    吴敬禄; 王苏民; 潘红玺; 夏威岚

    1997-01-01

    The sequences of climatic evolution are reconstructed by the analyses of δ13C and δ18O of carbonate from core RM in the Zoige Basin since 140 kaB. P. During the Last Glaciation there existed at least seven warm climatic fluctuations and five cold events correlated with the records of ice core and deep sea, and during the preceding last in-terglacial period there were two cold climatic variations coinciding with the record of ice core GRIP. These results depict climatic instability in east Qinghai-Xizang Plateau over the last interglacial period. In addition, the environmental proxies of the carbonate content and pigments indicate the similar results to the stable isotope record from core RM.

  6. AltiKa: a Ka-band Altimetry Payload and System for Operational Altimetry during the GMES Period

    Science.gov (United States)

    Vincent, Patrick; Steunou, Nathalie; Caubet, Eric; Phalippou, Laurent; Rey, Laurent; Thouvenot, Eric; Verron, Jacques

    2006-01-01

    This paper describes the Ka-band altimetry payload and system that has been studied for several years by CNES, ALCATEL SPACE and some science laboratories. Altimetry is one of the major elements of the ocean observing system to be made sustainable through the GEOSS (Global Earth Observation System of Systems) and GMES (Global Monitoring of the Environment and Security) programs. A short review of some mission objectives to be fulfilled in terms of mesoscale oceanography in the frame of the GEOSS and GMES programs is performed. To answer the corresponding requirements, the approach consisting in a constellation of nadir altimeter is discussed. A coupled Ka-band altimeter-radiometer payload is then described; technical items are detailed to explain how this payload shall meet the science and operational requirements, and expected performances are displayed. The current status of the payload development and flight perspectives are given.

  7. AltiKa: a Ka-band Altimetry Payload and System for Operational Altimetry during the GMES Period

    Directory of Open Access Journals (Sweden)

    Jacques Verron

    2006-03-01

    Full Text Available This paper describes the Ka-band altimetry payload and system that has beenstudied for several years by CNES, ALCATEL SPACE and some science laboratories.Altimetry is one of the major elements of the ocean observing system to be madesustainable through the GEOSS (Global Earth Observation System of Systems and GMES(Global Monitoring of the Environment and Security programs. A short review of somemission objectives to be fulfilled in terms of mesoscale oceanography in the frame of theGEOSS and GMES programs is performed. To answer the corresponding requirements, theapproach consisting in a constellation of nadir altimeter is discussed. A coupled Ka-bandaltimeter-radiometer payload is then described; technical items are detailed to explain howthis payload shall meet the science and operational requirements, and expectedperformances are displayed. The current status of the payload development and flightperspectives are given.

  8. AcEST: BP917073 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000095_E10 67 Adiantum capillus-veneris mRNA. clone: YMU001_000095_E10. BP917073 - Show BP91707... mRNA. clone: YMU001_000095_E10. Accession BP917073 Tissue type prothallium Developmental stage - Contig ID

  9. AcEST: BP919848 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000129_H02 84 Adiantum capillus-veneris mRNA. clone: YMU001_000129_H02. BP919848 - Show BP91984... mRNA. clone: YMU001_000129_H02. Accession BP919848 Tissue type prothallium Developmental stage - Contig ID

  10. AcEST: BP912001 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000011_H05 68 Adiantum capillus-veneris mRNA. clone: YMU001_000011_H05. BP912001 - Show BP9120... mRNA. clone: YMU001_000011_H05. Accession BP912001 Tissue type prothallium Developmental stage - Contig ID

  11. AcEST: BP920096 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000132_H11 24 Adiantum capillus-veneris mRNA. clone: YMU001_000132_H11. BP920096 - Show BP9200... mRNA. clone: YMU001_000132_H11. Accession BP920096 Tissue type prothallium Developmental stage - Contig ID

  12. AcEST: BP915983 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_D10 68 Adiantum capillus-veneris mRNA. clone: YMU001_000081_D10. BP915983 - Show BP9159... mRNA. clone: YMU001_000081_D10. Accession BP915983 Tissue type prothallium Developmental stage - Contig ID

  13. AcEST: BP915976 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_C10 41 Adiantum capillus-veneris mRNA. clone: YMU001_000081_C10. BP915976 - Show BP9159... mRNA. clone: YMU001_000081_C10. Accession BP915976 Tissue type prothallium Developmental stage - Contig ID

  14. AcEST: BP915990 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_E12 98 Adiantum capillus-veneris mRNA. clone: YMU001_000081_E12. BP915990 - Show BP9159... mRNA. clone: YMU001_000081_E12. Accession BP915990 Tissue type prothallium Developmental stage - Contig ID

  15. AcEST: BP915963 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_B02 67 Adiantum capillus-veneris mRNA. clone: YMU001_000081_B02. BP915963 - Show BP9159... mRNA. clone: YMU001_000081_B02. Accession BP915963 Tissue type prothallium Developmental stage - Contig ID

  16. AcEST: BP915998 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_F12 46 Adiantum capillus-veneris mRNA. clone: YMU001_000081_F12. BP915998 - Show BP9159... mRNA. clone: YMU001_000081_F12. Accession BP915998 Tissue type prothallium Developmental stage - Contig ID

  17. AcEST: BP915935 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000079_F11 64 Adiantum capillus-veneris mRNA. clone: YMU001_000079_F11. BP915935 - Show BP9159... mRNA. clone: YMU001_000079_F11. Accession BP915935 Tissue type prothallium Developmental stage - Contig ID

  18. AcEST: BP911835 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000009_G02 27 Adiantum capillus-veneris mRNA. clone: YMU001_000009_G02. BP911835 - Show BP91183... mRNA. clone: YMU001_000009_G02. Accession BP911835 Tissue type prothallium Developmental stage - Contig ID

  19. AcEST: BP911839 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000009_G06 76 Adiantum capillus-veneris mRNA. clone: YMU001_000009_G06. BP911839 - Show BP91183... mRNA. clone: YMU001_000009_G06. Accession BP911839 Tissue type prothallium Developmental stage - Contig ID

  20. AcEST: BP919947 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000131_A11 35 Adiantum capillus-veneris mRNA. clone: YMU001_000131_A11. BP919947 - Show BP91994... mRNA. clone: YMU001_000131_A11. Accession BP919947 Tissue type prothallium Developmental stage - Contig ID

  1. AcEST: BP915006 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000065_D07 96 Adiantum capillus-veneris mRNA. clone: YMU001_000065_D07. BP915006 - Show BP91500... mRNA. clone: YMU001_000065_D07. Accession BP915006 Tissue type prothallium Developmental stage - Contig ID

  2. AcEST: BP920020 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000132_B05 91 Adiantum capillus-veneris mRNA. clone: YMU001_000132_B05. BP920020 - Show BP920020... mRNA. clone: YMU001_000132_B05. Accession BP920020 Tissue type prothallium Developmental stage - Contig ID

  3. AcEST: BP915916 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000079_D12 73 Adiantum capillus-veneris mRNA. clone: YMU001_000079_D12. BP915916 - Show BP91591... mRNA. clone: YMU001_000079_D12. Accession BP915916 Tissue type prothallium Developmental stage - Contig ID

  4. Rock magnetic response to climatic changes in west Philippine Sea for the last 780 ka:Discussion based on relative paleointensity assisted chronology

    Institute of Scientific and Technical Information of China (English)

    Shulan GE; Xuefa SHI; Gang YANG; Yonghua WU

    2008-01-01

    of revelation of climatic fluctuation by magnetic size is also found in the South China Sea,which shows a common pattern of magnetic signals to climate at least within East Asia.The concentration of ARM(representing more about fine grain)also shows similar response to glacial and interglacial cycles,that is,high in interglacial cycle and low in glacial cycle£"but k and SIRM(reflecting more about coarse grain)lack the response to the climatic cycles.At the same time,Sratio lacks the correlation with aeolian dust record and rhythmic changes,indicating the dominant source of main magnetic carrier(low coercivity magnetite)is the suspended matter instead of dust.The decreasing trend of sedimentation rate from west to east also reveals that the sediments are mainly from west Luzon and adjacent land.Grain sizes first became coarse and then stable around 400 ka B.P., and at the same time all the magnetic contents lowered and amplitude Of magnetic mineral changes increased.The magnetic transition around 400 ka B.P.is simultaneous with the decreases of carbonate content,reflecting a global carbonate dissolution event.i.e.mid Brunhes event.The synchronization of magnetic content and grain size with climatic cycles of glacials and interglacials imply the validity of paleointesnityassisted chronology.Also,the response of rock magnetic signals to stable oxygen isotope changes and carbonate variation reveals that rock magnetism method can be an effective tool for paleoclimatic and paleoceanographic research.

  5. Deficiency in Either 4E-BP1 or 4E-BP2 Augments Innate Antiviral Immune Responses

    Science.gov (United States)

    Nehdi, Atef; Sean, Polen; Linares, Izzar; Colina, Rodney; Jaramillo, Maritza; Alain, Tommy

    2014-01-01

    Genetic deletion of both 4E-BP1 and 4E-BP2 was found to protect cells against viral infections. Here we demonstrate that the individual loss of either 4E-BP1 or 4E-BP2 in mouse embryonic fibroblasts (MEFs) is sufficient to confer viral resistance. shRNA-mediated silencing of 4E-BP1 or 4E-BP2 renders MEFs resistant to viruses, and compared to wild type cells, MEFs knockout for either 4E-BP1 or 4E-BP2 exhibit enhanced translation of Irf-7 and consequently increased innate immune response to viruses. Accordingly, the replication of vesicular stomatitis virus, encephalomyocarditis virus, influenza virus and Sindbis virus is markedly suppressed in these cells. Importantly, expression of either 4E-BP1 or 4E-BP2 in double knockout or respective single knockout cells diminishes their resistance to viral infection. Our data show that loss of 4E-BP1 or 4E-BP2 potentiates innate antiviral immunity. These results provide further evidence for translational control of innate immunity and support targeting translational effectors as an antiviral strategy. PMID:25531441

  6. AcEST: BP912479 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000019_H10 595 Adiantum capillus-veneris mRNA. clone: YMU001_000019_H10. BP912479 - Show BP91247...is mRNA. clone: YMU001_000019_H10. Accession BP912479 Tissue type prothallium Developmental stage - Contig I...T and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91247...PSVNQRCLGG 325 + + + E+ KVPSV + G Sbjct: 2452 STTFVSD---RSLEKHPKVPSVEAVTVNG 2477 ...h programs, Nucleic Acids Res. 25:3389-3402. Query= BP912479|Adiantum capillus-veneris mRNA, clone: YMU001_0

  7. AcEST: BP912472 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000019_H03 369 Adiantum capillus-veneris mRNA. clone: YMU001_000019_H03. BP912472 - Show BP91247...is mRNA. clone: YMU001_000019_H03. Accession BP912472 Tissue type prothallium Developmental stage - Contig I...abase search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912472|Adiantum capillus-veneris mRNA, clon...ams, Nucleic Acids Res. 25:3389-3402. Query= BP912472|Adiantum capillus-veneris mRNA, clone: YMU001_000019_H

  8. AcEST: BP912470 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000019_H01 466 Adiantum capillus-veneris mRNA. clone: YMU001_000019_H01. BP91247...0 CL266Contig1 Show BP912470 Clone id YMU001_000019_H01 Library YMU01 Length 466 Definition Adiantum cap...illus-veneris mRNA. clone: YMU001_000019_H01. Accession BP912470 Tissue type prothallium Developmental stage...programs, Nucleic Acids Res. 25:3389-3402. Query= BP912470|Adiantum capillus-vene... BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91247

  9. AcEST: BP921247 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000147_D10 328 Adiantum capillus-veneris mRNA. clone: YMU001_000147_D10. BP921247... CL2844Contig1 Show BP921247 Clone id YMU001_000147_D10 Library YMU01 Length 328 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000147_D10. Accession BP921247 Tissue type prothallium Developmental stag...25:3389-3402. Query= BP921247|Adiantum capillus-veneris mRNA, clone: YMU001_000147_D10. (311 letters) Databa...generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921247|Adiantum ca

  10. AcEST: BP912471 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000019_H02 517 Adiantum capillus-veneris mRNA. clone: YMU001_000019_H02. BP912471 - Show BP91247...is mRNA. clone: YMU001_000019_H02. Accession BP912471 Tissue type prothallium Developmental stage - Contig I... of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91247...(34%), Positives = 38/78 (48%), Gaps = 6/78 (7%) Frame = -1 Query: 247 KDNAITDDSLKRFESQQKN-IFDWFRKKGAPEA---V...ase search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912471|Adiantum ca

  11. AcEST: BP913247 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000028_B06 567 Adiantum capillus-veneris mRNA. clone: YMU001_000028_B06. BP913247 - Show BP913247...is mRNA. clone: YMU001_000028_B06. Accession BP913247 Tissue type prothallium Developmental stage - Contig I...se search programs, Nucleic Acids Res. 25:3389-3402. Query= BP913247|Adiantum capillus-veneris mRNA, clone: ...ucleic Acids Res. 25:3389-3402. Query= BP913247|Adiantum capillus-veneris mRNA, c

  12. AcEST: BP912474 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000019_H05 367 Adiantum capillus-veneris mRNA. clone: YMU001_000019_H05. BP91247...4 CL2087Contig1 Show BP912474 Clone id YMU001_000019_H05 Library YMU01 Length 367 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000019_H05. Accession BP912474 Tissue type prothallium Developmental stag... generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912474|Adiantum c...eration of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912474|Adiantum capil

  13. AcEST: BP920247 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000134_G05 431 Adiantum capillus-veneris mRNA. clone: YMU001_000134_G05. BP920247 - Show BP920247...is mRNA. clone: YMU001_000134_G05. Accession BP920247 Tissue type prothallium Developmental stage - Contig I...AST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920247...ped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920247

  14. AcEST: BP918247 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000111_C03 349 Adiantum capillus-veneris mRNA. clone: YMU001_000111_C03. BP918247 - Show BP918247...is mRNA. clone: YMU001_000111_C03. Accession BP918247 Tissue type prothallium Developmental stage - Contig I... Nucleic Acids Res. 25:3389-3402. Query= BP918247|Adiantum capillus-veneris mRNA, clone: YMU001_000111_C03. ...I-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP918247

  15. AcEST: BP912247 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000016_G11 467 Adiantum capillus-veneris mRNA. clone: YMU001_000016_G11. BP912247 - Show BP912247...is mRNA. clone: YMU001_000016_G11. Accession BP912247 Tissue type prothallium Developmental stage - Contig I...f protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912247...ein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912247|Adiantum capillus-veneris mRN

  16. AcEST: BP915247 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000069_C06 538 Adiantum capillus-veneris mRNA. clone: YMU001_000069_C06. BP915247... CL4212Contig1 Show BP915247 Clone id YMU001_000069_C06 Library YMU01 Length 538 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000069_C06. Accession BP915247 Tissue type prothallium Developmental stag...otein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915247|Adiantum capillus-veneris m... PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915247

  17. AcEST: BP919684 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000127_H09 516 Adiantum capillus-veneris mRNA. clone: YMU001_000127_H09. BP919684 - Show BP91968...is mRNA. clone: YMU001_000127_H09. Accession BP919684 Tissue type prothallium Developmental stage - Contig I...rotein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919684...BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91968

  18. AcEST: BP919685 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000127_H10 544 Adiantum capillus-veneris mRNA. clone: YMU001_000127_H10. BP919685 - Show BP91968...is mRNA. clone: YMU001_000127_H10. Accession BP919685 Tissue type prothallium Developmental stage - Contig I... Res. 25:3389-3402. Query= BP919685|Adiantum capillus-veneris mRNA, clone: YMU001_000127_H10. (544 letters) ...eneration of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91968

  19. AcEST: BP919687 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000128_A01 517 Adiantum capillus-veneris mRNA. clone: YMU001_000128_A01. BP919687 - Show BP91968...is mRNA. clone: YMU001_000128_A01. Accession BP919687 Tissue type prothallium Developmental stage - Contig I...AST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91968...PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91968

  20. AcEST: BP919681 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000127_H06 556 Adiantum capillus-veneris mRNA. clone: YMU001_000127_H06. BP919681 - Show BP91968...is mRNA. clone: YMU001_000127_H06. Accession BP919681 Tissue type prothallium Developmental stage - Contig I...otein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919681|Adiantum capillus-veneris m...ucleic Acids Res. 25:3389-3402. Query= BP919681|Adiantum capillus-veneris mRNA, clone: YMU001_000127_H06. (5

  1. AcEST: BP919683 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000127_H08 545 Adiantum capillus-veneris mRNA. clone: YMU001_000127_H08. BP919683 - Show BP91968...is mRNA. clone: YMU001_000127_H08. Accession BP919683 Tissue type prothallium Developmental stage - Contig I...Acids Res. 25:3389-3402. Query= BP919683|Adiantum capillus-veneris mRNA, clone: YMU001_000127_H08. (545 lett... protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919683|Adiantum capillus-veneri

  2. AcEST: BP912209 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000016_D06 540 Adiantum capillus-veneris mRNA. clone: YMU001_000016_D06. BP912209 - Show BP91220...is mRNA. clone: YMU001_000016_D06. Accession BP912209 Tissue type prothallium Developmental stage - Contig I...protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912209|Adiantum capillus-veneris... programs, Nucleic Acids Res. 25:3389-3402. Query= BP912209|Adiantum capillus-veneris mRNA, clone: YMU001_00

  3. AcEST: BP919858 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000130_A04 328 Adiantum capillus-veneris mRNA. clone: YMU001_000130_A04. BP919858 - Show BP91985...is mRNA. clone: YMU001_000130_A04. Accession BP919858 Tissue type prothallium Developmental stage - Contig I...AST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91985...ation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919858|Adiantum capillu

  4. AcEST: BP919857 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000130_A03 501 Adiantum capillus-veneris mRNA. clone: YMU001_000130_A03. BP91985...7 CL3173Contig1 Show BP919857 Clone id YMU001_000130_A03 Library YMU01 Length 501 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000130_A03. Accession BP919857 Tissue type prothallium Developmental stag...eration of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91985...T: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919857|Ad

  5. AcEST: BP919852 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000129_H07 499 Adiantum capillus-veneris mRNA. clone: YMU001_000129_H07. BP919852 - Show BP91985...is mRNA. clone: YMU001_000129_H07. Accession BP919852 Tissue type prothallium Developmental stage - Contig I..., Nucleic Acids Res. 25:3389-3402. Query= BP919852|Adiantum capillus-veneris mRNA...tabase search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919852|Adiantum capillus-veneris mRNA, clo

  6. AcEST: BP911985 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000011_F08 421 Adiantum capillus-veneris mRNA. clone: YMU001_000011_F08. BP911985 - Show BP911985...is mRNA. clone: YMU001_000011_F08. Accession BP911985 Tissue type prothallium Developmental stage - Contig I...7), Gapped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91198...rams, Nucleic Acids Res. 25:3389-3402. Query= BP911985|Adiantum capillus-veneris

  7. AcEST: BP917474 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000101_C07 287 Adiantum capillus-veneris mRNA. clone: YMU001_000101_C07. BP917474... CL2332Contig1 Show BP917474 Clone id YMU001_000101_C07 Library YMU01 Length 287 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000101_C07. Accession BP917474 Tissue type prothallium Developmental stag...eration of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP917474|Adiantum capil...ch programs, Nucleic Acids Res. 25:3389-3402. Query= BP917474|Adiantum capillus-veneris mRNA, clone: YMU001_

  8. AcEST: BP921003 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000144_D08 457 Adiantum capillus-veneris mRNA. clone: YMU001_000144_D08. BP92100...3 CL1992Contig1 Show BP921003 Clone id YMU001_000144_D08 Library YMU01 Length 457 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000144_D08. Accession BP921003 Tissue type prothallium Developmental stag...ds Res. 25:3389-3402. Query= BP921003|Adiantum capillus-veneris mRNA, clone: YMU0...f protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921003|Adiantum capillus-vener

  9. AcEST: BP921008 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000144_E02 477 Adiantum capillus-veneris mRNA. clone: YMU001_000144_E02. BP921008 - Show BP92100...is mRNA. clone: YMU001_000144_E02. Accession BP921008 Tissue type prothallium Developmental stage - Contig I...c Acids Res. 25:3389-3402. Query= BP921008|Adiantum capillus-veneris mRNA, clone:...ion of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921008|Adiantum capillus-

  10. AcEST: BP921007 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000144_E01 460 Adiantum capillus-veneris mRNA. clone: YMU001_000144_E01. BP92100...7 CL57Contig1 Show BP921007 Clone id YMU001_000144_E01 Library YMU01 Length 460 Definition Adiantum capi...llus-veneris mRNA. clone: YMU001_000144_E01. Accession BP921007 Tissue type prothallium Developmental stage ...search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921007|Adiantum capill... protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921007|Adiantum capillus-veneri

  11. AcEST: BP916167 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000084_A11 268 Adiantum capillus-veneris mRNA. clone: YMU001_000084_A11. BP916167 - Show BP91616...is mRNA. clone: YMU001_000084_A11. Accession BP916167 Tissue type prothallium Developmental stage - Contig I... database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP916167|Adiantum capillus-veneris mRNA, ...ds Res. 25:3389-3402. Query= BP916167|Adiantum capillus-veneris mRNA, clone: YMU001_000084_A11. (253 letters

  12. AcEST: BP911616 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000007_B05 303 Adiantum capillus-veneris mRNA. clone: YMU001_000007_B05. BP911616 - Show BP911616...is mRNA. clone: YMU001_000007_B05. Accession BP911616 Tissue type prothallium Developmental stage - Contig I...ion of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP911616|Adiantum capillus-... and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP911616...132 PE=4 SV=1 Length = 278 Score = 69.7 bits (169), Expect = 7e-11 Identities = 2

  13. AcEST: BP920305 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000135_E03 413 Adiantum capillus-veneris mRNA. clone: YMU001_000135_E03. BP920305 - Show BP92030...is mRNA. clone: YMU001_000135_E03. Accession BP920305 Tissue type prothallium Developmental stage - Contig I...rotein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920305|Adiantum capillus-veneris ... new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920305|Adiant

  14. AcEST: BP920306 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000135_E04 480 Adiantum capillus-veneris mRNA. clone: YMU001_000135_E04. BP920306 - Show BP92030...is mRNA. clone: YMU001_000135_E04. Accession BP920306 Tissue type prothallium Developmental stage - Contig I...n of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92030...ST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92030

  15. AcEST: BP920303 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000135_E01 493 Adiantum capillus-veneris mRNA. clone: YMU001_000135_E01. BP920303 - Show BP92030...is mRNA. clone: YMU001_000135_E01. Accession BP920303 Tissue type prothallium Developmental stage - Contig I...f protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92030...ion of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920303|Adiantum capillus-

  16. AcEST: BP920307 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000135_E05 493 Adiantum capillus-veneris mRNA. clone: YMU001_000135_E05. BP920307 - Show BP92030...is mRNA. clone: YMU001_000135_E05. Accession BP920307 Tissue type prothallium Developmental stage - Contig I...arch programs, Nucleic Acids Res. 25:3389-3402. Query= BP920307|Adiantum capillus...-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92030

  17. AcEST: BP920309 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000135_E07 488 Adiantum capillus-veneris mRNA. clone: YMU001_000135_E07. BP920309 - Show BP92030...is mRNA. clone: YMU001_000135_E07. Accession BP920309 Tissue type prothallium Developmental stage - Contig I...tabase search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920309|Adiantum... a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920309|Adia

  18. AcEST: BP914147 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000042_D12 534 Adiantum capillus-veneris mRNA. clone: YMU001_000042_D12. BP914147 - Show BP91414...is mRNA. clone: YMU001_000042_D12. Accession BP914147 Tissue type prothallium Developmental stage - Contig I...T: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91414...niprot_sprot.fasta 412,525 sequences; 148,809,765 total letters Searching......................................ids Res. 25:3389-3402. Query= BP914147|Adiantum capillus-veneris mRNA, clone: YMU001_000042_D12. (534 letter

  19. AcEST: BP917072 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000095_E09 516 Adiantum capillus-veneris mRNA. clone: YMU001_000095_E09. BP917072 - Show BP91707...is mRNA. clone: YMU001_000095_E09. Accession BP917072 Tissue type prothallium Developmental stage - Contig I... Acids Res. 25:3389-3402. Query= BP917072|Adiantum capillus-veneris mRNA, clone: YMU001_000095_E09. (516 let...LAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91707

  20. AcEST: BP917078 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000095_F03 438 Adiantum capillus-veneris mRNA. clone: YMU001_000095_F03. BP91707...8 CL4266Contig1 Show BP917078 Clone id YMU001_000095_F03 Library YMU01 Length 438 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000095_F03. Accession BP917078 Tissue type prothallium Developmental stag...Gapped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91707...programs, Nucleic Acids Res. 25:3389-3402. Query= BP917078|Adiantum capillus-vene

  1. AcEST: BP917071 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000095_E08 525 Adiantum capillus-veneris mRNA. clone: YMU001_000095_E08. BP917071 - Show BP91707...is mRNA. clone: YMU001_000095_E08. Accession BP917071 Tissue type prothallium Developmental stage - Contig I...ew generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91707...earch programs, Nucleic Acids Res. 25:3389-3402. Query= BP917071|Adiantum capillus-veneris mRNA, clone: YMU0

  2. AcEST: BP917077 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000095_F02 487 Adiantum capillus-veneris mRNA. clone: YMU001_000095_F02. BP91707...7 CL10Contig1 Show BP917077 Clone id YMU001_000095_F02 Library YMU01 Length 487 Definition Adiantum capi...llus-veneris mRNA. clone: YMU001_000095_F02. Accession BP917077 Tissue type prothallium Developmental stage ... protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91707...AST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP917077|

  3. AcEST: BP917074 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000095_E11 418 Adiantum capillus-veneris mRNA. clone: YMU001_000095_E11. BP91707...4 CL413Contig1 Show BP917074 Clone id YMU001_000095_E11 Library YMU01 Length 418 Definition Adiantum cap...illus-veneris mRNA. clone: YMU001_000095_E11. Accession BP917074 Tissue type prothallium Developmental stage...w generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP917074|Adiantum ...ograms, Nucleic Acids Res. 25:3389-3402. Query= BP917074|Adiantum capillus-veneri

  4. AcEST: BP917070 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000095_E07 451 Adiantum capillus-veneris mRNA. clone: YMU001_000095_E07. BP917070 - Show BP91707...is mRNA. clone: YMU001_000095_E07. Accession BP917070 Tissue type prothallium Developmental stage - Contig I...Gapped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91707...s. 25:3389-3402. Query= BP917070|Adiantum capillus-veneris mRNA, clone: YMU001_000095_E07. (451 letters) Dat

  5. AcEST: BP920002 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000131_G12 513 Adiantum capillus-veneris mRNA. clone: YMU001_000131_G12. BP92000...2 CL642Contig1 Show BP920002 Clone id YMU001_000131_G12 Library YMU01 Length 513 Definition Adiantum cap...illus-veneris mRNA. clone: YMU001_000131_G12. Accession BP920002 Tissue type prothallium Developmental stage...on of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92000...new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920002|Adiantu

  6. AcEST: BP920008 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000131_H10 566 Adiantum capillus-veneris mRNA. clone: YMU001_000131_H10. BP920008 - Show BP92000...is mRNA. clone: YMU001_000131_H10. Accession BP920008 Tissue type prothallium Developmental stage - Contig I...n database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920008|Adiantum capillus-veneris mRNA,...Acids Res. 25:3389-3402. Query= BP920008|Adiantum capillus-veneris mRNA, clone: YMU001_000131_H10. (566 lett

  7. AcEST: BP920006 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000131_H08 454 Adiantum capillus-veneris mRNA. clone: YMU001_000131_H08. BP92000...6 CL749Contig1 Show BP920006 Clone id YMU001_000131_H08 Library YMU01 Length 454 Definition Adiantum cap...illus-veneris mRNA. clone: YMU001_000131_H08. Accession BP920006 Tissue type prothallium Developmental stage...rch programs, Nucleic Acids Res. 25:3389-3402. Query= BP920006|Adiantum capillus-...n of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920006|Adiantum capillus-ve

  8. AcEST: BP920004 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000131_H06 151 Adiantum capillus-veneris mRNA. clone: YMU001_000131_H06. BP920004 - Show BP92000...is mRNA. clone: YMU001_000131_H06. Accession BP920004 Tissue type prothallium Developmental stage - Contig I...ds Res. 25:3389-3402. Query= BP920004|Adiantum capillus-veneris mRNA, clone: YMU0...AST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920004|

  9. AcEST: BP920000 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000131_G10 490 Adiantum capillus-veneris mRNA. clone: YMU001_000131_G10. BP920000 - Show BP92000...is mRNA. clone: YMU001_000131_G10. Accession BP920000 Tissue type prothallium Developmental stage - Contig I...eneration of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92000...eration of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920000|Adiantum capil

  10. AcEST: BP913220 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000027_G12 489 Adiantum capillus-veneris mRNA. clone: YMU001_000027_G12. BP913220 - Show BP913220...is mRNA. clone: YMU001_000027_G12. Accession BP913220 Tissue type prothallium Developmental stage - Contig I...grams, Nucleic Acids Res. 25:3389-3402. Query= BP913220|Adiantum capillus-veneris...LAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP913220

  11. AcEST: BP917220 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000097_G09 125 Adiantum capillus-veneris mRNA. clone: YMU001_000097_G09. BP917220 - Show BP917220...is mRNA. clone: YMU001_000097_G09. Accession BP917220 Tissue type prothallium Developmental stage - Contig I...T and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP917220...rotein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP917220|Adiantum capillus-veneris

  12. AcEST: BP912220 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000016_E08 357 Adiantum capillus-veneris mRNA. clone: YMU001_000016_E08. BP912220 - Show BP912220...is mRNA. clone: YMU001_000016_E08. Accession BP912220 Tissue type prothallium Developmental stage - Contig I...), Gapped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912220...PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912220

  13. AcEST: BP912200 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000016_C08 572 Adiantum capillus-veneris mRNA. clone: YMU001_000016_C08. BP91220...0 CL3270Contig1 Show BP912200 Clone id YMU001_000016_C08 Library YMU01 Length 572 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000016_C08. Accession BP912200 Tissue type prothallium Developmental stag...tabase search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912200|Adiantum capillus-veneris mRNA, clo...rograms, Nucleic Acids Res. 25:3389-3402. Query= BP912200|Adiantum capillus-vener

  14. AcEST: BP921220 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000147_B06 550 Adiantum capillus-veneris mRNA. clone: YMU001_000147_B06. BP921220 - Show BP921220...is mRNA. clone: YMU001_000147_B06. Accession BP921220 Tissue type prothallium Developmental stage - Contig I...base search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921220|Adiantum capillus-veneris mRNA, clone...database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921220|Adiantum capillus-veneris mRNA, c

  15. AcEST: BP912207 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000016_D04 249 Adiantum capillus-veneris mRNA. clone: YMU001_000016_D04. BP912207 - Show BP91220...is mRNA. clone: YMU001_000016_D04. Accession BP912207 Tissue type prothallium Developmental stage - Contig I...I-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91220...SI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91220

  16. AcEST: BP912206 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000016_D03 484 Adiantum capillus-veneris mRNA. clone: YMU001_000016_D03. BP912206 - Show BP91220...is mRNA. clone: YMU001_000016_D03. Accession BP912206 Tissue type prothallium Developmental stage - Contig I...e search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912206|Adiantum capi...-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91220

  17. AcEST: BP915220 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000067_H10 510 Adiantum capillus-veneris mRNA. clone: YMU001_000067_H10. BP915220 - Show BP915220...is mRNA. clone: YMU001_000067_H10. Accession BP915220 Tissue type prothallium Developmental stage - Contig I...tion of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915220...search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915220|Adiantum capillus-veneris mRNA, clone: YMU

  18. AcEST: BP920168 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_H02 390 Adiantum capillus-veneris mRNA. clone: YMU001_000133_H02. BP920168 - Show BP92016...is mRNA. clone: YMU001_000133_H02. Accession BP920168 Tissue type prothallium Developmental stage - Contig I...n database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920168|Adiantum capillus-veneris mRNA,...c Acids Res. 25:3389-3402. Query= BP920168|Adiantum capillus-veneris mRNA, clone: YMU001_000133_H02. (390 le

  19. AcEST: BP920169 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_H03 505 Adiantum capillus-veneris mRNA. clone: YMU001_000133_H03. BP920169 - Show BP92016...is mRNA. clone: YMU001_000133_H03. Accession BP920169 Tissue type prothallium Developmental stage - Contig I...eration of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92016...eneration of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920169|Adiantum cap

  20. AcEST: BP920167 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_H01 152 Adiantum capillus-veneris mRNA. clone: YMU001_000133_H01. BP920167 - Show BP92016...is mRNA. clone: YMU001_000133_H01. Accession BP920167 Tissue type prothallium Developmental stage - Contig I...ids Res. 25:3389-3402. Query= BP920167|Adiantum capillus-veneris mRNA, clone: YMU...LAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920167

  1. AcEST: BP920161 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_G06 542 Adiantum capillus-veneris mRNA. clone: YMU001_000133_G06. BP920161 - Show BP92016...is mRNA. clone: YMU001_000133_G06. Accession BP920161 Tissue type prothallium Developmental stage - Contig I...LAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9201...ped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92016

  2. AcEST: BP920166 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_G12 149 Adiantum capillus-veneris mRNA. clone: YMU001_000133_G12. BP920166 - Show BP92016...is mRNA. clone: YMU001_000133_G12. Accession BP920166 Tissue type prothallium Developmental stage - Contig I...w generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92016...protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920166|Adiantum capillus-veneris

  3. AcEST: BP920164 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_G09 447 Adiantum capillus-veneris mRNA. clone: YMU001_000133_G09. BP920164 - Show BP92016...is mRNA. clone: YMU001_000133_G09. Accession BP920164 Tissue type prothallium Developmental stage - Contig I...ST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920164|A...se search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920164|Adiantum cap

  4. AcEST: BP920163 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_G08 372 Adiantum capillus-veneris mRNA. clone: YMU001_000133_G08. BP92016...3 CL2472Contig1 Show BP920163 Clone id YMU001_000133_G08 Library YMU01 Length 372 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000133_G08. Accession BP920163 Tissue type prothallium Developmental stag...eneration of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920163|Adiantum cap... search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920163|Adiantum capillus-veneris mRNA, clone: YM

  5. AcEST: BP920165 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_G11 301 Adiantum capillus-veneris mRNA. clone: YMU001_000133_G11. BP920165 - Show BP92016...is mRNA. clone: YMU001_000133_G11. Accession BP920165 Tissue type prothallium Developmental stage - Contig I...LAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920165...and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92016

  6. AcEST: BP917075 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000095_E12 529 Adiantum capillus-veneris mRNA. clone: YMU001_000095_E12. BP917075 - Show BP917075...is mRNA. clone: YMU001_000095_E12. Accession BP917075 Tissue type prothallium Developmental stage - Contig I...generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP917075...in database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP917075|Adiantum capillus-veneris mRNA

  7. AcEST: BP919847 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000129_H01 512 Adiantum capillus-veneris mRNA. clone: YMU001_000129_H01. BP919847 - Show BP91984...is mRNA. clone: YMU001_000129_H01. Accession BP919847 Tissue type prothallium Developmental stage - Contig I... new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91984...earch programs, Nucleic Acids Res. 25:3389-3402. Query= BP919847|Adiantum capillus-veneris mRNA, clone: YMU0

  8. AcEST: BP919842 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000129_G07 567 Adiantum capillus-veneris mRNA. clone: YMU001_000129_G07. BP919842 - Show BP91984...is mRNA. clone: YMU001_000129_G07. Accession BP919842 Tissue type prothallium Developmental stage - Contig I...otein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919842|Adiantum capillus-veneris m...c Acids Res. 25:3389-3402. Query= BP919842|Adiantum capillus-veneris mRNA, clone: YMU001_000129_G07. (567 le

  9. AcEST: BP919840 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000129_G05 476 Adiantum capillus-veneris mRNA. clone: YMU001_000129_G05. BP919840 - Show BP91984...is mRNA. clone: YMU001_000129_G05. Accession BP919840 Tissue type prothallium Developmental stage - Contig I...Res. 25:3389-3402. Query= BP919840|Adiantum capillus-veneris mRNA, clone: YMU001_...es. 25:3389-3402. Query= BP919840|Adiantum capillus-veneris mRNA, clone: YMU001_0

  10. AcEST: BP919843 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000129_G09 473 Adiantum capillus-veneris mRNA. clone: YMU001_000129_G09. BP91984...3 CL2697Contig1 Show BP919843 Clone id YMU001_000129_G09 Library YMU01 Length 473 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000129_G09. Accession BP919843 Tissue type prothallium Developmental stag...ein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919843|Ad...rotein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919843|Adiantum capillus-veneris

  11. AcEST: BP911984 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000011_F07 566 Adiantum capillus-veneris mRNA. clone: YMU001_000011_F07. BP911984... CL2332Contig1 Show BP911984 Clone id YMU001_000011_F07 Library YMU01 Length 566 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000011_F07. Accession BP911984 Tissue type prothallium Developmental stag...tein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP911984|Adiantum capillus-veneris mR...I-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP911984

  12. AcEST: BP919845 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000129_G11 376 Adiantum capillus-veneris mRNA. clone: YMU001_000129_G11. BP919845 - Show BP91984...is mRNA. clone: YMU001_000129_G11. Accession BP919845 Tissue type prothallium Developmental stage - Contig I...ms, Nucleic Acids Res. 25:3389-3402. Query= BP919845|Adiantum capillus-veneris mRNA, clone: YMU001_000129_G1...tion of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919845|Adiantum capillus

  13. AcEST: BP919849 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000129_H04 454 Adiantum capillus-veneris mRNA. clone: YMU001_000129_H04. BP919849 - Show BP91984...is mRNA. clone: YMU001_000129_H04. Accession BP919849 Tissue type prothallium Developmental stage - Contig I...s. 25:3389-3402. Query= BP919849|Adiantum capillus-veneris mRNA, clone: YMU001_00...rograms, Nucleic Acids Res. 25:3389-3402. Query= BP919849|Adiantum capillus-veneris mRNA, clone: YMU001_0001

  14. AcEST: BP918650 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000116_A01 560 Adiantum capillus-veneris mRNA. clone: YMU001_000116_A01. BP918650... CL552Contig1 Show BP918650 Clone id YMU001_000116_A01 Library YMU01 Length 560 Definition Adiantum cap...illus-veneris mRNA. clone: YMU001_000116_A01. Accession BP918650 Tissue type prothallium Developmental stage...n of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP918650|Adiantum capillus-ve...database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP918650|Adiant

  15. AcEST: BP916000 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_G02 533 Adiantum capillus-veneris mRNA. clone: YMU001_000081_G02. BP916000 - Show BP916000...is mRNA. clone: YMU001_000081_G02. Accession BP916000 Tissue type prothallium Developmental stage - Contig I...generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP916000...s Res. 25:3389-3402. Query= BP916000|Adiantum capillus-veneris mRNA, clone: YMU001_000081_G02. (533 letters)

  16. AcEST: BP912094 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000015_A09 564 Adiantum capillus-veneris mRNA. clone: YMU001_000015_A09. BP9120...94 CL2967Contig1 Show BP912094 Clone id YMU001_000015_A09 Library YMU01 Length 564 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000015_A09. Accession BP912094 Tissue type prothallium Developmental stag... generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912094|Adiantum c...PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9120

  17. AcEST: BP912057 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000012_E09 528 Adiantum capillus-veneris mRNA. clone: YMU001_000012_E09. BP9120...57 CL1892Contig1 Show BP912057 Clone id YMU001_000012_E09 Library YMU01 Length 528 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000012_E09. Accession BP912057 Tissue type prothallium Developmental stag...Acids Res. 25:3389-3402. Query= BP912057|Adiantum capillus-veneris mRNA, clone: YMU001_000012_E09. (528 lett... protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9120

  18. AcEST: BP921209 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000147_A04 535 Adiantum capillus-veneris mRNA. clone: YMU001_000147_A04. BP921209 - Show BP92120...is mRNA. clone: YMU001_000147_A04. Accession BP921209 Tissue type prothallium Developmental stage - Contig I...on of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92120...grams, Nucleic Acids Res. 25:3389-3402. Query= BP921209|Adiantum capillus-veneris mRNA, clone: YMU001_000147

  19. AcEST: BP912061 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000012_F01 532 Adiantum capillus-veneris mRNA. clone: YMU001_000012_F01. BP912061 - Show BP9120...is mRNA. clone: YMU001_000012_F01. Accession BP912061 Tissue type prothallium Developmental stage - Contig I...AST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9120...d BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9120

  20. AcEST: BP912036 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000012_C09 555 Adiantum capillus-veneris mRNA. clone: YMU001_000012_C09. BP912036 - Show BP9120...is mRNA. clone: YMU001_000012_C09. Accession BP912036 Tissue type prothallium Developmental stage - Contig I...ms, Nucleic Acids Res. 25:3389-3402. Query= BP912036|Adiantum capillus-veneris mRNA, clone: YMU001_000012_C0... of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912036|Adiantum capillus-ven

  1. AcEST: BP912025 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000012_B09 484 Adiantum capillus-veneris mRNA. clone: YMU001_000012_B09. BP9120...25 CL1441Contig1 Show BP912025 Clone id YMU001_000012_B09 Library YMU01 Length 484 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000012_B09. Accession BP912025 Tissue type prothallium Developmental stag...on of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9120...and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9120

  2. AcEST: BP912042 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000012_D05 541 Adiantum capillus-veneris mRNA. clone: YMU001_000012_D05. BP912042 - Show BP9120...is mRNA. clone: YMU001_000012_D05. Accession BP912042 Tissue type prothallium Developmental stage - Contig I...c Acids Res. 25:3389-3402. Query= BP912042|Adiantum capillus-veneris mRNA, clone: YMU001_000012_D05. (541 le...eration of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912042|Adiantum capil

  3. AcEST: BP921208 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000147_A03 436 Adiantum capillus-veneris mRNA. clone: YMU001_000147_A03. BP921208 - Show BP92120...is mRNA. clone: YMU001_000147_A03. Accession BP921208 Tissue type prothallium Developmental stage - Contig I..., Gapped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92120... generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921208|Adiantum c

  4. AcEST: BP912056 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000012_E08 538 Adiantum capillus-veneris mRNA. clone: YMU001_000012_E08. BP912056 - Show BP9120...is mRNA. clone: YMU001_000012_E08. Accession BP912056 Tissue type prothallium Developmental stage - Contig I...base search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912056|Adiantum capillus-veneris mRNA, clone... Gapped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9120

  5. AcEST: BP921120 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000146_A02 427 Adiantum capillus-veneris mRNA. clone: YMU001_000146_A02. BP921120 - Show BP921120...is mRNA. clone: YMU001_000146_A02. Accession BP921120 Tissue type prothallium Developmental stage - Contig I... Acids Res. 25:3389-3402. Query= BP921120|Adiantum capillus-veneris mRNA, clone: ...a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921120|Adian

  6. AcEST: BP912009 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000012_A03 561 Adiantum capillus-veneris mRNA. clone: YMU001_000012_A03. BP912009 - Show BP9120...is mRNA. clone: YMU001_000012_A03. Accession BP912009 Tissue type prothallium Developmental stage - Contig I...s, Nucleic Acids Res. 25:3389-3402. Query= BP912009|Adiantum capillus-veneris mRNA, clone: YMU001_000012_A03... database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912009|Adian

  7. AcEST: BP912030 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000012_C03 525 Adiantum capillus-veneris mRNA. clone: YMU001_000012_C03. BP912030 - Show BP9120...is mRNA. clone: YMU001_000012_C03. Accession BP912030 Tissue type prothallium Developmental stage - Contig I...ein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912030|Ad...cids Res. 25:3389-3402. Query= BP912030|Adiantum capillus-veneris mRNA, clone: YMU001_000012_C03. (513 lette

  8. AcEST: BP912050 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000012_E01 544 Adiantum capillus-veneris mRNA. clone: YMU001_000012_E01. BP912050 - Show BP9120...is mRNA. clone: YMU001_000012_E01. Accession BP912050 Tissue type prothallium Developmental stage - Contig I...database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP912050|Adiantum capillus-veneris mRNA, c.... 25:3389-3402. Query= BP912050|Adiantum capillus-veneris mRNA, clone: YMU001_000

  9. AcEST: BP919570 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000126_F05 404 Adiantum capillus-veneris mRNA. clone: YMU001_000126_F05. BP91957...0 CL2080Contig1 Show BP919570 Clone id YMU001_000126_F05 Library YMU01 Length 404 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000126_F05. Accession BP919570 Tissue type prothallium Developmental stag...ST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919570|A... generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919570|Adiantum c

  10. AcEST: BP919578 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000126_G03 472 Adiantum capillus-veneris mRNA. clone: YMU001_000126_G03. BP919578 - Show BP91957...is mRNA. clone: YMU001_000126_G03. Accession BP919578 Tissue type prothallium Developmental stage - Contig I...grams, Nucleic Acids Res. 25:3389-3402. Query= BP919578|Adiantum capillus-veneris...e search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919578|Adiantum capillus-veneris mRNA, clone: Y

  11. AcEST: BP919577 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000126_G02 494 Adiantum capillus-veneris mRNA. clone: YMU001_000126_G02. BP91957...7 CL2728Contig1 Show BP919577 Clone id YMU001_000126_G02 Library YMU01 Length 494 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000126_G02. Accession BP919577 Tissue type prothallium Developmental stag...search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919577|Adiantum capill...Acids Res. 25:3389-3402. Query= BP919577|Adiantum capillus-veneris mRNA, clone: YMU001_000126_G02. (494 lett

  12. AcEST: BP911957 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000011_C07 599 Adiantum capillus-veneris mRNA. clone: YMU001_000011_C07. BP911957... CL144Contig1 Show BP911957 Clone id YMU001_000011_C07 Library YMU01 Length 599 Definition Adiantum cap...illus-veneris mRNA. clone: YMU001_000011_C07. Accession BP911957 Tissue type prothallium Developmental stage...n of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP911957|Adiantum capillus-ve... new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP911957|Adiant

  13. AcEST: BP919158 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000121_H06 381 Adiantum capillus-veneris mRNA. clone: YMU001_000121_H06. BP919158 - Show BP91915...is mRNA. clone: YMU001_000121_H06. Accession BP919158 Tissue type prothallium Developmental stage - Contig I... programs, Nucleic Acids Res. 25:3389-3402. Query= BP919158|Adiantum capillus-veneris mRNA, clone: YMU001_00...and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91915

  14. AcEST: BP919153 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000121_G11 445 Adiantum capillus-veneris mRNA. clone: YMU001_000121_G11. BP919153 - Show BP91915...is mRNA. clone: YMU001_000121_G11. Accession BP919153 Tissue type prothallium Developmental stage - Contig I.... 25:3389-3402. Query= BP919153|Adiantum capillus-veneris mRNA, clone: YMU001_000...base search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919153|Adiantum capillus-veneris mRNA, clone

  15. AcEST: BP919159 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000121_H07 370 Adiantum capillus-veneris mRNA. clone: YMU001_000121_H07. BP919159 - Show BP91915...is mRNA. clone: YMU001_000121_H07. Accession BP919159 Tissue type prothallium Developmental stage - Contig I...c Acids Res. 25:3389-3402. Query= BP919159|Adiantum capillus-veneris mRNA, clone: YMU001_000121_H07. (370 le...tion of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919159|Adiantum capillus

  16. AcEST: BP919157 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000121_H05 491 Adiantum capillus-veneris mRNA. clone: YMU001_000121_H05. BP919157 - Show BP91915...is mRNA. clone: YMU001_000121_H05. Accession BP919157 Tissue type prothallium Developmental stage - Contig I...earch programs, Nucleic Acids Res. 25:3389-3402. Query= BP919157|Adiantum capillu.... 25:3389-3402. Query= BP919157|Adiantum capillus-veneris mRNA, clone: YMU001_000

  17. AcEST: BP911915 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000010_B01 450 Adiantum capillus-veneris mRNA. clone: YMU001_000010_B01. BP911915 - Show BP911915...is mRNA. clone: YMU001_000010_B01. Accession BP911915 Tissue type prothallium Developmental stage - Contig I...pped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP911915...7), Gapped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91191

  18. AcEST: BP919156 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000121_H04 416 Adiantum capillus-veneris mRNA. clone: YMU001_000121_H04. BP919156 - Show BP91915...is mRNA. clone: YMU001_000121_H04. Accession BP919156 Tissue type prothallium Developmental stage - Contig I...atabase search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919156|Adiantum capillus-veneris mRNA, cl...ids Res. 25:3389-3402. Query= BP919156|Adiantum capillus-veneris mRNA, clone: YMU001_000121_H04. (416 letter

  19. AcEST: BP919154 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000121_H01 347 Adiantum capillus-veneris mRNA. clone: YMU001_000121_H01. BP919154 - Show BP91915...is mRNA. clone: YMU001_000121_H01. Accession BP919154 Tissue type prothallium Developmental stage - Contig I...cleic Acids Res. 25:3389-3402. Query= BP919154|Adiantum capillus-veneris mRNA, clone: YMU001_000121_H01. (34...e search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919154|Adiantum capi

  20. AcEST: BP921593 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000151_H04 435 Adiantum capillus-veneris mRNA. clone: YMU001_000151_H04. BP921593 - Show BP92159...is mRNA. clone: YMU001_000151_H04. Accession BP921593 Tissue type prothallium Developmental stage - Contig I...new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921593|Adiantu...n of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921593|Adiantum capillus-ve

  1. AcEST: BP915953 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000079_H11 379 Adiantum capillus-veneris mRNA. clone: YMU001_000079_H11. BP915953 - Show BP9159...is mRNA. clone: YMU001_000079_H11. Accession BP915953 Tissue type prothallium Developmental stage - Contig I...atabase search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915953|Adiantum capillus-veneris mRNA, cl...ograms, Nucleic Acids Res. 25:3389-3402. Query= BP915953|Adiantum capillus-veneris mRNA, clone: YMU001_00007

  2. AcEST: BP911596 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000006_H03 483 Adiantum capillus-veneris mRNA. clone: YMU001_000006_H03. BP91159...6 CL3750Contig1 Show BP911596 Clone id YMU001_000006_H03 Library YMU01 Length 483 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000006_H03. Accession BP911596 Tissue type prothallium Developmental stag...protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91159...cleic Acids Res. 25:3389-3402. Query= BP911596|Adiantum capillus-veneris mRNA, cl

  3. AcEST: BP921596 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000151_H07 266 Adiantum capillus-veneris mRNA. clone: YMU001_000151_H07. BP921596 - Show BP92159...is mRNA. clone: YMU001_000151_H07. Accession BP921596 Tissue type prothallium Developmental stage - Contig I...Res. 25:3389-3402. Query= BP921596|Adiantum capillus-veneris mRNA, clone: YMU001_000151_H07. (266 letters) D...ed BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92159

  4. AcEST: BP921595 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000151_H06 534 Adiantum capillus-veneris mRNA. clone: YMU001_000151_H06. BP921595 - Show BP92159...is mRNA. clone: YMU001_000151_H06. Accession BP921595 Tissue type prothallium Developmental stage - Contig I...base search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921595|Adiantum capillus-veneris mRNA, clone...YTMTSVLKAASSLPEGLSLSKQVHVHAIKINNVSDSF 453 Query: 159 VGSSLVYSYAKCGLLADAKDVLRALPME...rotein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921595|Adiantum capillus-veneris

  5. AcEST: BP915989 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_E06 446 Adiantum capillus-veneris mRNA. clone: YMU001_000081_E06. BP915989 - Show BP9159...is mRNA. clone: YMU001_000081_E06. Accession BP915989 Tissue type prothallium Developmental stage - Contig I...new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915989|Adiantu... new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915989|Adiant

  6. AcEST: BP915993 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_F03 459 Adiantum capillus-veneris mRNA. clone: YMU001_000081_F03. BP9159...93 CL3815Contig1 Show BP915993 Clone id YMU001_000081_F03 Library YMU01 Length 459 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000081_F03. Accession BP915993 Tissue type prothallium Developmental stag...grams, Nucleic Acids Res. 25:3389-3402. Query= BP915993|Adiantum capillus-veneris...ein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915993|Ad

  7. AcEST: BP915967 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_B08 257 Adiantum capillus-veneris mRNA. clone: YMU001_000081_B08. BP915967 - Show BP9159...is mRNA. clone: YMU001_000081_B08. Accession BP915967 Tissue type prothallium Developmental stage - Contig I... Acids Res. 25:3389-3402. Query= BP915967|Adiantum capillus-veneris mRNA, clone: YMU001_000081_B08. (257 let...leic Acids Res. 25:3389-3402. Query= BP915967|Adiantum capillus-veneris mRNA, clone: YMU001_000081_B08. (257

  8. AcEST: BP915943 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000079_G09 414 Adiantum capillus-veneris mRNA. clone: YMU001_000079_G09. BP9159...43 CL2212Contig1 Show BP915943 Clone id YMU001_000079_G09 Library YMU01 Length 414 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000079_G09. Accession BP915943 Tissue type prothallium Developmental stag... PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9159... search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915943|Adiantum capil

  9. AcEST: BP914159 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000042_F04 523 Adiantum capillus-veneris mRNA. clone: YMU001_000042_F04. BP914159 - Show BP914159...is mRNA. clone: YMU001_000042_F04. Accession BP914159 Tissue type prothallium Developmental stage - Contig I...ein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP914159|Ad... Nucleic Acids Res. 25:3389-3402. Query= BP914159|Adiantum capillus-veneris mRNA, clone: YMU001_000042_F04. ...ccus ... 164 3e-39 tr|Q2SL81|Q2SL81_HAHCH Predicted oxidoreductase (Related to aryl... 159

  10. AcEST: BP921159 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000146_D08 139 Adiantum capillus-veneris mRNA. clone: YMU001_000146_D08. BP921159 - Show BP921159...is mRNA. clone: YMU001_000146_D08. Accession BP921159 Tissue type prothallium Developmental stage - Contig I...), Gapped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921159...eneration of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921159|Adiantum cap

  11. AcEST: BP915987 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_E04 561 Adiantum capillus-veneris mRNA. clone: YMU001_000081_E04. BP9159...87 CL3121Contig1 Show BP915987 Clone id YMU001_000081_E04 Library YMU01 Length 561 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000081_E04. Accession BP915987 Tissue type prothallium Developmental stag...otein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915987|Adiantum capillus-veneris m...cids Res. 25:3389-3402. Query= BP915987|Adiantum capillus-veneris mRNA, clone: YM

  12. AcEST: BP921599 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000151_H10 118 Adiantum capillus-veneris mRNA. clone: YMU001_000151_H10. BP921599 - Show BP92159...is mRNA. clone: YMU001_000151_H10. Accession BP921599 Tissue type prothallium Developmental stage - Contig I...I-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92159...atabase search programs, Nucleic Acids Res. 25:3389-3402. Query= BP921599|Adiantum capillus-veneris mRNA, cl

  13. AcEST: BP915936 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000079_F12 539 Adiantum capillus-veneris mRNA. clone: YMU001_000079_F12. BP915936 - Show BP9159...is mRNA. clone: YMU001_000079_F12. Accession BP915936 Tissue type prothallium Developmental stage - Contig I...programs, Nucleic Acids Res. 25:3389-3402. Query= BP915936|Adiantum capillus-veneris mRNA, clone: YMU001_000...base search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915936|Adiantum capillus-veneris mRNA, clone

  14. AcEST: BP911592 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000006_G08 335 Adiantum capillus-veneris mRNA. clone: YMU001_000006_G08. BP911592 - Show BP91159...is mRNA. clone: YMU001_000006_G08. Accession BP911592 Tissue type prothallium Developmental stage - Contig I...Gapped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91159...leic Acids Res. 25:3389-3402. Query= BP911592|Adiantum capillus-veneris mRNA, clo

  15. AcEST: BP915940 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000079_G05 434 Adiantum capillus-veneris mRNA. clone: YMU001_000079_G05. BP915940 - Show BP9159...is mRNA. clone: YMU001_000079_G05. Accession BP915940 Tissue type prothallium Developmental stage - Contig I...-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9159...-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9159

  16. AcEST: BP915950 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000079_H07 391 Adiantum capillus-veneris mRNA. clone: YMU001_000079_H07. BP9159...50 CL180Contig1 Show BP915950 Clone id YMU001_000079_H07 Library YMU01 Length 391 Definition Adiantum cap...illus-veneris mRNA. clone: YMU001_000079_H07. Accession BP915950 Tissue type prothallium Developmental stage...w generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915950|Adiantum ...ds Res. 25:3389-3402. Query= BP915950|Adiantum capillus-veneris mRNA, clone: YMU0

  17. AcEST: BP915903 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000079_C09 388 Adiantum capillus-veneris mRNA. clone: YMU001_000079_C09. BP915903 - Show BP9159...is mRNA. clone: YMU001_000079_C09. Accession BP915903 Tissue type prothallium Developmental stage - Contig I...ion of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915903|Adiantum capillus-...Acids Res. 25:3389-3402. Query= BP915903|Adiantum capillus-veneris mRNA, clone: Y

  18. AcEST: BP915923 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000079_E07 554 Adiantum capillus-veneris mRNA. clone: YMU001_000079_E07. BP915923 - Show BP9159...is mRNA. clone: YMU001_000079_E07. Accession BP915923 Tissue type prothallium Developmental stage - Contig I...programs, Nucleic Acids Res. 25:3389-3402. Query= BP915923|Adiantum capillus-veneris mRNA, clone: YMU001_000...protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915923|Adiantum capillus-veneris

  19. AcEST: BP915973 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_C06 192 Adiantum capillus-veneris mRNA. clone: YMU001_000081_C06. BP915973 - Show BP9159...is mRNA. clone: YMU001_000081_C06. Accession BP915973 Tissue type prothallium Developmental stage - Contig I...neration of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915973|Adiantum capi... database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915973|Adiantum capillus-veneris mRNA,

  20. AcEST: BP921597 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000151_H08 523 Adiantum capillus-veneris mRNA. clone: YMU001_000151_H08. BP921597 - Show BP92159...is mRNA. clone: YMU001_000151_H08. Accession BP921597 Tissue type prothallium Developmental stage - Contig I...c Acids Res. 25:3389-3402. Query= BP921597|Adiantum capillus-veneris mRNA, clone: YMU001_000151_H08. (523 le...s. 25:3389-3402. Query= BP921597|Adiantum capillus-veneris mRNA, clone: YMU001_000151_H08. (523 letters) Dat

  1. AcEST: BP915934 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000079_F09 314 Adiantum capillus-veneris mRNA. clone: YMU001_000079_F09. BP9159...34 CL780Contig1 Show BP915934 Clone id YMU001_000079_F09 Library YMU01 Length 314 Definition Adiantum cap...illus-veneris mRNA. clone: YMU001_000079_F09. Accession BP915934 Tissue type prothallium Developmental stage... 25:3389-3402. Query= BP915934|Adiantum capillus-veneris mRNA, clone: YMU001_000079_F09. (314 letters) Datab..., Nucleic Acids Res. 25:3389-3402. Query= BP915934|Adiantum capillus-veneris mRNA

  2. AcEST: BP911590 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000006_G05 493 Adiantum capillus-veneris mRNA. clone: YMU001_000006_G05. BP911590 - Show BP91159...is mRNA. clone: YMU001_000006_G05. Accession BP911590 Tissue type prothallium Developmental stage - Contig I...rams, Nucleic Acids Res. 25:3389-3402. Query= BP911590|Adiantum capillus-veneris ...-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91159

  3. AcEST: BP915997 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_F11 339 Adiantum capillus-veneris mRNA. clone: YMU001_000081_F11. BP915997 - Show BP9159...is mRNA. clone: YMU001_000081_F11. Accession BP915997 Tissue type prothallium Developmental stage - Contig I...es. 25:3389-3402. Query= BP915997|Adiantum capillus-veneris mRNA, clone: YMU001_000081_F11. (339 letters) Da...ic Acids Res. 25:3389-3402. Query= BP915997|Adiantum capillus-veneris mRNA, clone

  4. AcEST: BP915974 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_C07 482 Adiantum capillus-veneris mRNA. clone: YMU001_000081_C07. BP915974 - Show BP9159...is mRNA. clone: YMU001_000081_C07. Accession BP915974 Tissue type prothallium Developmental stage - Contig I...Acids Res. 25:3389-3402. Query= BP915974|Adiantum capillus-veneris mRNA, clone: Y...ST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915974|A

  5. AcEST: BP915977 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_D01 114 Adiantum capillus-veneris mRNA. clone: YMU001_000081_D01. BP9159...77 CL784Contig1 Show BP915977 Clone id YMU001_000081_D01 Library YMU01 Length 114 Definition Adiantum cap...illus-veneris mRNA. clone: YMU001_000081_D01. Accession BP915977 Tissue type prothallium Developmental stage... new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9159...arch programs, Nucleic Acids Res. 25:3389-3402. Query= BP915977|Adiantum capillus

  6. AcEST: BP915994 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_F04 459 Adiantum capillus-veneris mRNA. clone: YMU001_000081_F04. BP9159...94 CL758Contig1 Show BP915994 Clone id YMU001_000081_F04 Library YMU01 Length 459 Definition Adiantum cap...illus-veneris mRNA. clone: YMU001_000081_F04. Accession BP915994 Tissue type prothallium Developmental stage... database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915994|Adian...T and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9159

  7. AcEST: BP915920 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000079_E04 504 Adiantum capillus-veneris mRNA. clone: YMU001_000079_E04. BP9159...20 CL1388Contig1 Show BP915920 Clone id YMU001_000079_E04 Library YMU01 Length 504 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000079_E04. Accession BP915920 Tissue type prothallium Developmental stag...ST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9159...ids Res. 25:3389-3402. Query= BP915920|Adiantum capillus-veneris mRNA, clone: YMU

  8. AcEST: BP915958 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_A06 197 Adiantum capillus-veneris mRNA. clone: YMU001_000081_A06. BP915958 - Show BP9159...is mRNA. clone: YMU001_000081_A06. Accession BP915958 Tissue type prothallium Developmental stage - Contig I... Gapped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9159...VEHEDSEEAIELYREM 48 Y+ GK+E+AR D ++ RD+ W+ ++ Y + ++ + L++ M Sbjct: 159 YARCGKMEE...atabase search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915958|Adiantum capillus-veneris mRNA, cl

  9. AcEST: BP915981 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_D06 333 Adiantum capillus-veneris mRNA. clone: YMU001_000081_D06. BP915981 - Show BP9159...is mRNA. clone: YMU001_000081_D06. Accession BP915981 Tissue type prothallium Developmental stage - Contig I...es. 25:3389-3402. Query= BP915981|Adiantum capillus-veneris mRNA, clone: YMU001_000081_D06. (333 letters) Da...: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915981|Adi

  10. AcEST: BP915900 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000079_C05 595 Adiantum capillus-veneris mRNA. clone: YMU001_000079_C05. BP9159...00 CL1444Contig1 Show BP915900 Clone id YMU001_000079_C05 Library YMU01 Length 595 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000079_C05. Accession BP915900 Tissue type prothallium Developmental stag...w generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915900|Adiantum ... a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9159

  11. AcEST: BP915909 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000079_D04 507 Adiantum capillus-veneris mRNA. clone: YMU001_000079_D04. BP915909 - Show BP9159...is mRNA. clone: YMU001_000079_D04. Accession BP915909 Tissue type prothallium Developmental stage - Contig I...ams, Nucleic Acids Res. 25:3389-3402. Query= BP915909|Adiantum capillus-veneris m... Res. 25:3389-3402. Query= BP915909|Adiantum capillus-veneris mRNA, clone: YMU001_000079_D04. (507 letters)

  12. AcEST: BP915979 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_D03 267 Adiantum capillus-veneris mRNA. clone: YMU001_000081_D03. BP915979 - Show BP9159...is mRNA. clone: YMU001_000081_D03. Accession BP915979 Tissue type prothallium Developmental stage - Contig I...protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915979|Adiantum capillus-veneris...ed BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9159

  13. AcEST: BP915959 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000081_A07 490 Adiantum capillus-veneris mRNA. clone: YMU001_000081_A07. BP915959 - Show BP9159...is mRNA. clone: YMU001_000081_A07. Accession BP915959 Tissue type prothallium Developmental stage - Contig I... programs, Nucleic Acids Res. 25:3389-3402. Query= BP915959|Adiantum capillus-ven...BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9159

  14. AcEST: BP921590 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000151_G12 506 Adiantum capillus-veneris mRNA. clone: YMU001_000151_G12. BP921590 - Show BP92159...is mRNA. clone: YMU001_000151_G12. Accession BP921590 Tissue type prothallium Developmental stage - Contig I...ew generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92159...ids Res. 25:3389-3402. Query= BP921590|Adiantum capillus-veneris mRNA, clone: YMU

  15. AcEST: BP921594 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000151_H05 354 Adiantum capillus-veneris mRNA. clone: YMU001_000151_H05. BP92159...4 CL410Contig1 Show BP921594 Clone id YMU001_000151_H05 Library YMU01 Length 354 Definition Adiantum cap...illus-veneris mRNA. clone: YMU001_000151_H05. Accession BP921594 Tissue type prothallium Developmental stage... Nucleic Acids Res. 25:3389-3402. Query= BP921594|Adiantum capillus-veneris mRNA, clone: YMU001_000151_H05. ...ion of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92159

  16. AcEST: BP918306 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000112_A03 562 Adiantum capillus-veneris mRNA. clone: YMU001_000112_A03. BP918306 - Show BP91830...is mRNA. clone: YMU001_000112_A03. Accession BP918306 Tissue type prothallium Developmental stage - Contig I...rams, Nucleic Acids Res. 25:3389-3402. Query= BP918306|Adiantum capillus-veneris mRNA, clone: YMU001_000112_...grams, Nucleic Acids Res. 25:3389-3402. Query= BP918306|Adiantum capillus-veneris mRNA, clone: YMU001_000112

  17. AcEST: BP918302 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000111_H03 457 Adiantum capillus-veneris mRNA. clone: YMU001_000111_H03. BP918302 - Show BP91830...is mRNA. clone: YMU001_000111_H03. Accession BP918302 Tissue type prothallium Developmental stage - Contig I...ST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91830...generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP918302|Adiantum ca

  18. AcEST: BP915830 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000077_E09 601 Adiantum capillus-veneris mRNA. clone: YMU001_000077_E09. BP915830 - Show BP915830...is mRNA. clone: YMU001_000077_E09. Accession BP915830 Tissue type prothallium Developmental stage - Contig I...new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915830|Adiantu...otein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915830|Adiantum capillus-veneris m

  19. AcEST: BP918830 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000118_A03 482 Adiantum capillus-veneris mRNA. clone: YMU001_000118_A03. BP918830... CL578Contig1 Show BP918830 Clone id YMU001_000118_A03 Library YMU01 Length 482 Definition Adiantum cap...illus-veneris mRNA. clone: YMU001_000118_A03. Accession BP918830 Tissue type prothallium Developmental stage...f protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP918830...s, Nucleic Acids Res. 25:3389-3402. Query= BP918830|Adiantum capillus-veneris mRNA, clone: YMU001_000118_A03

  20. AcEST: BP919830 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000129_F05 476 Adiantum capillus-veneris mRNA. clone: YMU001_000129_F05. BP919830... CL2022Contig1 Show BP919830 Clone id YMU001_000129_F05 Library YMU01 Length 476 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000129_F05. Accession BP919830 Tissue type prothallium Developmental stag... generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP919830...leic Acids Res. 25:3389-3402. Query= BP919830|Adiantum capillus-veneris mRNA, clone: YMU001_000129_F05. (458

  1. AcEST: BP917830 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000106_A10 487 Adiantum capillus-veneris mRNA. clone: YMU001_000106_A10. BP917830 - Show BP917830...is mRNA. clone: YMU001_000106_A10. Accession BP917830 Tissue type prothallium Developmental stage - Contig I...abase search programs, Nucleic Acids Res. 25:3389-3402. Query= BP917830|Adiantum ...ST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP917830|A

  2. AcEST: BP914830 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000063_D03 538 Adiantum capillus-veneris mRNA. clone: YMU001_000063_D03. BP914830 - Show BP914830...is mRNA. clone: YMU001_000063_D03. Accession BP914830 Tissue type prothallium Developmental stage - Contig I...rams, Nucleic Acids Res. 25:3389-3402. Query= BP914830|Adiantum capillus-veneris mRNA, clone: YMU001_000063_...programs, Nucleic Acids Res. 25:3389-3402. Query= BP914830|Adiantum capillus-vene

  3. AcEST: BP918309 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000112_A06 512 Adiantum capillus-veneris mRNA. clone: YMU001_000112_A06. BP91830...9 CL856Contig1 Show BP918309 Clone id YMU001_000112_A06 Library YMU01 Length 512 Definition Adiantum cap...illus-veneris mRNA. clone: YMU001_000112_A06. Accession BP918309 Tissue type prothallium Developmental stage...ograms, Nucleic Acids Res. 25:3389-3402. Query= BP918309|Adiantum capillus-veneris mRNA, clone: YMU001_00011... new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP91830

  4. AcEST: BP918814 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000117_G04 548 Adiantum capillus-veneris mRNA. clone: YMU001_000117_G04. BP918814 - Show BP918814...is mRNA. clone: YMU001_000117_G04. Accession BP918814 Tissue type prothallium Developmental stage - Contig I...s. 25:3389-3402. Query= BP918814|Adiantum capillus-veneris mRNA, clone: YMU001_000117_G04. (548 letters) Dat... Res. 25:3389-3402. Query= BP918814|Adiantum capillus-veneris mRNA, clone: YMU001_000117_G04. (548 letters)

  5. AcEST: BP920856 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000142_E09 470 Adiantum capillus-veneris mRNA. clone: YMU001_000142_E09. BP920856... CL4215Contig1 Show BP920856 Clone id YMU001_000142_E09 Library YMU01 Length 470 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000142_E09. Accession BP920856 Tissue type prothallium Developmental stag...rch programs, Nucleic Acids Res. 25:3389-3402. Query= BP920856|Adiantum capillus-... search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920856|Adiantum capil

  6. AcEST: BP920144 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_E09 265 Adiantum capillus-veneris mRNA. clone: YMU001_000133_E09. BP920144 - Show BP92014...is mRNA. clone: YMU001_000133_E09. Accession BP920144 Tissue type prothallium Developmental stage - Contig I...rch programs, Nucleic Acids Res. 25:3389-3402. Query= BP920144|Adiantum capillus-veneris mRNA, clone: YMU001...LAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92014

  7. AcEST: BP920141 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_E04 528 Adiantum capillus-veneris mRNA. clone: YMU001_000133_E04. BP920141 - Show BP92014...is mRNA. clone: YMU001_000133_E04. Accession BP920141 Tissue type prothallium Developmental stage - Contig I...cids Res. 25:3389-3402. Query= BP920141|Adiantum capillus-veneris mRNA, clone: YMU001_000133_E04. (528 lette...cleic Acids Res. 25:3389-3402. Query= BP920141|Adiantum capillus-veneris mRNA, clone: YMU001_000133_E04. (52

  8. AcEST: BP920148 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_F02 429 Adiantum capillus-veneris mRNA. clone: YMU001_000133_F02. BP92014...8 CL3819Contig1 Show BP920148 Clone id YMU001_000133_F02 Library YMU01 Length 429 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000133_F02. Accession BP920148 Tissue type prothallium Developmental stag...rograms, Nucleic Acids Res. 25:3389-3402. Query= BP920148|Adiantum capillus-vener...ed BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92014

  9. AcEST: BP920140 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_E03 489 Adiantum capillus-veneris mRNA. clone: YMU001_000133_E03. BP92014...0 CL2574Contig1 Show BP920140 Clone id YMU001_000133_E03 Library YMU01 Length 489 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000133_E03. Accession BP920140 Tissue type prothallium Developmental stag... database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920140|Adian... and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP92014

  10. AcEST: BP920142 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_E05 486 Adiantum capillus-veneris mRNA. clone: YMU001_000133_E05. BP920142 - Show BP92014...is mRNA. clone: YMU001_000133_E05. Accession BP920142 Tissue type prothallium Developmental stage - Contig I...rotein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920142|Adiantum capillus-veneris ...rograms, Nucleic Acids Res. 25:3389-3402. Query= BP920142|Adiantum capillus-veneris mRNA, clone: YMU001_0001

  11. AcEST: BP920147 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_F01 365 Adiantum capillus-veneris mRNA. clone: YMU001_000133_F01. BP920147 - Show BP92014...is mRNA. clone: YMU001_000133_F01. Accession BP920147 Tissue type prothallium Developmental stage - Contig I...ch programs, Nucleic Acids Res. 25:3389-3402. Query= BP920147|Adiantum capillus-veneris mRNA, clone: YMU001_...97), Gapped BLAST and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9201

  12. AcEST: BP920145 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_E11 274 Adiantum capillus-veneris mRNA. clone: YMU001_000133_E11. BP920145 - Show BP92014...is mRNA. clone: YMU001_000133_E11. Accession BP920145 Tissue type prothallium Developmental stage - Contig I..., Nucleic Acids Res. 25:3389-3402. Query= BP920145|Adiantum capillus-veneris mRNA, clone: YMU001_000133_E11.... database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920145|Adian

  13. AcEST: BP920143 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000133_E07 533 Adiantum capillus-veneris mRNA. clone: YMU001_000133_E07. BP92014...3 CL2377Contig1 Show BP920143 Clone id YMU001_000133_E07 Library YMU01 Length 533 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000133_E07. Accession BP920143 Tissue type prothallium Developmental stag...ms, Nucleic Acids Res. 25:3389-3402. Query= BP920143|Adiantum capillus-veneris mRNA, clone: YMU001_000133_E0...tabase search programs, Nucleic Acids Res. 25:3389-3402. Query= BP920143|Adiantum

  14. AcEST: BP915615 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000073_F08 475 Adiantum capillus-veneris mRNA. clone: YMU001_000073_F08. BP915615... CL3512Contig1 Show BP915615 Clone id YMU001_000073_F08 Library YMU01 Length 475 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000073_F08. Accession BP915615 Tissue type prothallium Developmental stag...search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915615|Adiantum capill...abase search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915615|Adiantum capillus-veneris mRNA, clon

  15. AcEST: BP915815 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000077_C11 552 Adiantum capillus-veneris mRNA. clone: YMU001_000077_C11. BP915815... CL3742Contig1 Show BP915815 Clone id YMU001_000077_C11 Library YMU01 Length 552 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000077_C11. Accession BP915815 Tissue type prothallium Developmental stag...rch programs, Nucleic Acids Res. 25:3389-3402. Query= BP915815|Adiantum capillus-veneris mRNA, clone: YMU001... new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915815|Adiant

  16. AcEST: BP915155 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000067_B08 468 Adiantum capillus-veneris mRNA. clone: YMU001_000067_B08. BP91515...5 CL2592Contig1 Show BP915155 Clone id YMU001_000067_B08 Library YMU01 Length 468 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000067_B08. Accession BP915155 Tissue type prothallium Developmental stag... of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915155|Adiantum capillus-ven...AST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915

  17. AcEST: BP918377 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000112_G07 508 Adiantum capillus-veneris mRNA. clone: YMU001_000112_G07. BP9183...77 CL44Contig1 Show BP918377 Clone id YMU001_000112_G07 Library YMU01 Length 508 Definition Adiantum capi...llus-veneris mRNA. clone: YMU001_000112_G07. Accession BP918377 Tissue type prothallium Developmental stage ...T: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9183...in database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP918377|Adi

  18. AcEST: BP918324 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000112_B09 441 Adiantum capillus-veneris mRNA. clone: YMU001_000112_B09. BP918324 - Show BP9183...is mRNA. clone: YMU001_000112_B09. Accession BP918324 Tissue type prothallium Developmental stage - Contig I... PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP9183...rotein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP918324|Adiantum capillus-veneris

  19. AcEST: BP915183 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000067_E04 303 Adiantum capillus-veneris mRNA. clone: YMU001_000067_E04. BP915183 - Show BP915183...is mRNA. clone: YMU001_000067_E04. Accession BP915183 Tissue type prothallium Developmental stage - Contig I...and PSI-BLAST: a new generation of protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP915183...es. 25:3389-3402. Query= BP915183|Adiantum capillus-veneris mRNA, clone: YMU001_0

  20. AcEST: BP918359 [AcEST

    Lifescience Database Archive (English)

    Full Text Available YMU001_000112_E12 553 Adiantum capillus-veneris mRNA. clone: YMU001_000112_E12. BP9183...59 CL3958Contig1 Show BP918359 Clone id YMU001_000112_E12 Library YMU01 Length 553 Definition Adiantum ca...pillus-veneris mRNA. clone: YMU001_000112_E12. Accession BP918359 Tissue type prothallium Developmental stag... protein database search programs, Nucleic Acids Res. 25:3389-3402. Query= BP918359|Adiantum capillus-veneri...e search programs, Nucleic Acids Res. 25:3389-3402. Query= BP918359|Adiantum capillus-veneris mRNA, clone: Y