Arid
DOI10.5194/cp-10-21-2014
Open Access Quantitative reconstruction of precipitation changes on the NE Tibetan Plateau since the Last Glacial Maximum - extending the concept of pollen source area to pollen-based climate reconstructions from large lakes
Wang, Y.1,2; Herzschuh, U.1,2; Shumilovskikh, L. S.3; Mischke, S.2,4; Birks, H. J. B.5,6,7,8; Wischnewski, J.1,2; Boehner, J.9; Schluetz, F.3,10; Lehmkuhl, F.11; Diekmann, B.1; Wuennemann, B.12; Zhang, C.13
通讯作者Wang, Y.
来源期刊CLIMATE OF THE PAST
ISSN1814-9324
EISSN1814-9332
出版年2014
卷号10期号:1页码:21-39
英文摘要

Pollen records from large lakes have been used for quantitative palaeoclimate reconstruction, but the influences that lake size (as a result of species-specific variations in pollen dispersal patterns that smaller pollen grains are more easily transported to lake centre) and taphonomy have on these climatic signals have not previously been systematically investigated. We introduce the concept of pollen source area to pollen-based climate calibration using the north-eastern Tibetan Plateau as our study area. We present a pollen data set collected from large lakes in the arid to semi-arid region of central Asia. The influences that lake size and the inferred pollen source areas have on pollen compositions have been investigated through comparisons with pollen assemblages in neighbouring lakes of various sizes. Modern pollen samples collected from different parts of Lake Donggi Cona (in the north-eastern part of the Tibetan Plateau) reveal variations in pollen assemblages within this large lake, which are interpreted in terms of the species-specific dispersal and depositional patterns for different types of pollen, and in terms of fluvial input components. We have estimated the pollen source area for each lake individually and used this information to infer modern climate data with which to then develop a modern calibration data set, using both the multivariate regression tree (MRT) and weighted-averaging partial least squares (WA-PLS) approaches. Fossil pollen data from Lake Donggi Cona have been used to reconstruct the climate history of the north-eastern part of the Tibetan Plateau since the Last Glacial Maximum (LGM). The meanannual precipitation was quantitatively reconstructed using WA-PLS: extremely dry conditions are found to have dominated the LGM, with annual precipitation of around 100 mm, which is only 32% of present-day precipitation. A gradually increasing trend in moisture conditions during the Late Glacial is terminated by an abrupt reversion to a dry phase that lasts for about 1000 yr and coincides with "Heinrich event 1" in the North Atlantic region. Subsequent periods corresponding to the Bolling/Allerod interstadial, with annual precipitation (P-ann) of about 350 mm, and the Younger Dryas event (about 270 mm P-ann) are followed by moist conditions in the early Holocene, with annual precipitation of up to 400 mm. A drier trend after 9 cal. ka BP is followed by a second wet phase in the middle Holocene, lasting until 4.5 cal. ka BP. Relatively steady conditions with only slight fluctuations then dominate the late Holocene, resulting in the present climatic conditions. The climate changes since the LGM have been primarily driven by deglaciation and fluctuations in the intensity of the Asian summer monsoon that resulted from changes in the Northern Hemisphere summer solar insolation, as well as from changes in the North Atlantic climate through variations in the circulation patterns and intensity of the westerlies.


类型Article
语种英语
国家Germany ; Norway ; England ; Peoples R China
收录类别SCI-E
WOS记录号WOS:000333837600002
WOS关键词DONGGI CONA ; BIOME RECONSTRUCTIONS ; ZOOPLANKTIVOROUS FISH ; MACROPHYTE DENSITY ; INDIAN MONSOON ; ASIAN MONSOON ; DAIHAI LAKE ; SEDIMENTS ; QINGHAI ; RECORD
WOS类目Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS研究方向Geology ; Meteorology & Atmospheric Sciences
来源机构兰州大学 ; 南京大学 ; University of London ; University of Oxford
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/181412
作者单位1.Alfred Wegener Inst Polar & Marine Res, Res Unit Potsdam, D-14473 Potsdam, Germany;
2.Univ Potsdam, Inst Earth & Environm Sci, D-14476 Potsdam, Germany;
3.Univ Gottingen, Dept Palynol & Climate Dynam, Albrecht von Haller Inst Plant Sci, D-37073 Gottingen, Germany;
4.Free Univ Berlin, Inst Geol Sci, D-12249 Berlin, Germany;
5.Univ Bergen, Dept Biol, N-5006 Bergen, Norway;
6.Bjerknes Ctr Climate Res, N-5007 Bergen, Norway;
7.UCL, Environm Change Res Ctr, London WC1E 6BT, England;
8.Univ Oxford, Sch Geog & Environm, Oxford OX1 3QY, England;
9.Univ Hamburg, Inst Geog, D-20145 Hamburg, Germany;
10.Free Univ Berlin, Inst Geog Sci, D-12249 Berlin, Germany;
11.Rhein Westfal TH Aachen, Dept Geog, D-52056 Aachen, Germany;
12.Nanjing Univ, Sch Geog & Oceanog, Nanjing 210093, Jiangsu, Peoples R China;
13.Lanzhou Univ, Sch Resources & Environm Sci, Ctr Arid Environm & Paleoclimate Res, Lanzhou 730000, Peoples R China
推荐引用方式
GB/T 7714
Wang, Y.,Herzschuh, U.,Shumilovskikh, L. S.,et al. Open Access Quantitative reconstruction of precipitation changes on the NE Tibetan Plateau since the Last Glacial Maximum - extending the concept of pollen source area to pollen-based climate reconstructions from large lakes[J]. 兰州大学, 南京大学, University of London, University of Oxford,2014,10(1):21-39.
APA Wang, Y..,Herzschuh, U..,Shumilovskikh, L. S..,Mischke, S..,Birks, H. J. B..,...&Zhang, C..(2014).Open Access Quantitative reconstruction of precipitation changes on the NE Tibetan Plateau since the Last Glacial Maximum - extending the concept of pollen source area to pollen-based climate reconstructions from large lakes.CLIMATE OF THE PAST,10(1),21-39.
MLA Wang, Y.,et al."Open Access Quantitative reconstruction of precipitation changes on the NE Tibetan Plateau since the Last Glacial Maximum - extending the concept of pollen source area to pollen-based climate reconstructions from large lakes".CLIMATE OF THE PAST 10.1(2014):21-39.
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