The climatic cyclicity in semiarid-arid central Asia over the past 500,000 years
Cheng, H (Cheng, H.)[1,2]; Zhang, PZ (Zhang, P. Z.)[3]; Spotl, C (Spoetl, C.)[4]; Edwards, RL (Edwards, R. L.)[2]; Cai, YJ (Cai, Y. J.)[5]; Zhang, DZ (Zhang, D. Z.)[3]; Sang, WC (Sang, W. C.)[3]; Tan, M (Tan, M.)[6]; An, ZS (An, Z. S.)[5]
2012-01-13
发表期刊GEOPHYSICAL RESEARCH LETTERS
卷号39页码:L01705
文章类型期刊论文
摘要

Central Asia is currently a semiarid-arid region, dominated by the Westerlies. It is important to understand mechanisms of climate and precipitation changes here, as water availability in the region is crucial today and in the future. High-resolution, absolutely-dated oxygen isotope (delta(18)O) records of stalagmites from Kesang Cave characterize a dynamic precipitation history over most of the past 500,000 years. This record demonstrates, for the first time, that climate change in the region exhibits a processional rhythm with abrupt inceptions of low delta(18)O speleothem growth at times of high Northern Hemisphere summer insolation followed by gradual delta(18)O increases that track decreases of insolation. These observations and interpretations contrast with the interpretation of nearby, but higher elevation ice core records. The absolutely-dated cave delta(18)O shifts can be used to correlate the regional climate variability by providing chronological marks. Combined with other paleoclimate records, the Kesang observations suggest that possible incursions of Asian summer monsoon rainfall or related moisture into the Kesang site and/or adjacent areas during the high insolation times may play an important role in changing orbital-scale hydrology of the region. Based on our record, arid climate will prevail in this region for the next several millennia, providing that anthropogenic effects do not supersede natural processes.

DOI10.1029/2011GL050202
收录类别SCI ; EI
语种英语
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/10209
专题黄土与第四纪地质国家重点实验室(2010~)
通讯作者Cheng, H (Cheng, H.)[1,2]
作者单位1.Institute of Global Environmental Change, Xi’an Jiaotong University,Xi’an, China;
2.Department of Earth Sciences, University of Minnesota, Minneapolis,Minnesota, USA;
3.College of Earth and Environment Sciences, Lanzhou University,Lanzhou, China;
4.Institut für Geologie und Paläontologie, Leopold-Franzens-Universität,Innsbruck, Austria;
5.Institute of Earth Environment, Chinese Academy of Sciences, Xi’an,China;
6.Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing, China
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Cheng, H ,Zhang, PZ ,Spotl, C ,et al. The climatic cyclicity in semiarid-arid central Asia over the past 500,000 years[J]. GEOPHYSICAL RESEARCH LETTERS,2012,39:L01705.
APA Cheng, H .,Zhang, PZ .,Spotl, C .,Edwards, RL .,Cai, YJ .,...&An, ZS .(2012).The climatic cyclicity in semiarid-arid central Asia over the past 500,000 years.GEOPHYSICAL RESEARCH LETTERS,39,L01705.
MLA Cheng, H ,et al."The climatic cyclicity in semiarid-arid central Asia over the past 500,000 years".GEOPHYSICAL RESEARCH LETTERS 39(2012):L01705.
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