Climate instability during the last deglaciation in central Asia, reconstructed by pollen data from Yili Valley, NW China
Zhao, KL (Zhao, Keliang)[ 1,2 ]; Li, XQ (Li, Xiaoqiang)[ 1,2 ]; Dodson, J (Dodson, John)[ 3 ]; Zhou, XY (Zhou, Xinying)[ 1,2 ]; Atahan, P (Atahan, Pia)[ 3 ]
2013-02-15
发表期刊REVIEW OF PALAEOBOTANY AND PALYNOLOGY
卷号189页码:8-17
文章类型期刊论文
摘要

An extended pollen record with grain size analysis and AMS C-14 dating is provided for a palaeolake section which is located in an intermountain basin in Yili Valley, Xinjiang, NW China. Covering the late MIS 3, early MIS 2 and the last deglaciation, vegetation variations and climate events are discussed in relation to changes in pollen assemblages and Artemisia/Chenopodiaceae (A/C) ratios. The presence of montane forest-steppe dominated by Picea and Taraxacum indicates a relative humid climate in the study area during late MIS 3 (before 31.5 cal kyr BP). Picea forest disappeared and the vegetation dominated by Chenopodiaceae shows the climate became dry from 31.5 to 14.7 cal kyr BP. The sediments of Last Glacial Maximum (LGM) period are absent in the section probably. Betula-Picea mixed forest occurred at 14.7 cal kyr BP and corresponds to the onset of the warm Bolling period in the North Atlantic. A long dry period was detected from 14.5 to 13.6 cal kyr BP on the basis of the occurrence of Chenopodiaceae desert. A subalpine meadow community dominated by Geranium covered the area during 13.6-13.4 cal kyr BP, suggesting lower temperatures at this time. This may coincide with the Older Dryas (OD). The most humid period in the record occurred between 13.4 and 12.9 cal kyr BP, which coincides with the warm Allerod period. Dry conditions prevailed from similar to 12.9 to 11.7 cal kyr BP in the area, coinciding with the Younger Dryas (YD) in the North Atlantic. Within this period a three-phase climate fluctuation was detected, which can be summarized as follows: a dry early YD (12.9-12.6 cal kyr BP), a slightly moister mid-YD (12.6-12.0 cal kyr BP) and a very dry late YD (12.0-11.7 cal kyr BP). These millennial to century-scale climatic events in Yili Valley correlate well with other palaeoclimate records in North Hemisphere, suggesting that these events probably originate from same mechanisms.

关键词Yili Valley Central Asia Late Mis3 Last Deglaciationbølling–allerød Warm Period Younger Dryas
DOI10.1016/j.revpalbo.2012.10.005
收录类别SCI
语种英语
引用统计
被引频次:19[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/10061
专题黄土与第四纪地质国家重点实验室(2010~)
通讯作者Li, XQ (Li, Xiaoqiang)[ 1,2 ]
作者单位1.The Laboratory of Human Evolution, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, 142 Xizhimenwai Street, Beijing 100044, China;
2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China;
3.Institute for Environmental Research, Australian Nuclear Science and Technology Organisation, Kirrawee, NSW 2232, Australia
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Zhao, KL ,Li, XQ ,Dodson, J ,et al. Climate instability during the last deglaciation in central Asia, reconstructed by pollen data from Yili Valley, NW China[J]. REVIEW OF PALAEOBOTANY AND PALYNOLOGY,2013,189:8-17.
APA Zhao, KL ,Li, XQ ,Dodson, J ,Zhou, XY ,&Atahan, P .(2013).Climate instability during the last deglaciation in central Asia, reconstructed by pollen data from Yili Valley, NW China.REVIEW OF PALAEOBOTANY AND PALYNOLOGY,189,8-17.
MLA Zhao, KL ,et al."Climate instability during the last deglaciation in central Asia, reconstructed by pollen data from Yili Valley, NW China".REVIEW OF PALAEOBOTANY AND PALYNOLOGY 189(2013):8-17.
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