Tibet forcing of mid-Pleistocene synchronous enhancement of East Asianwinter and summer monsoons revealed by Chinese loess record

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	Tibet forcing of mid-Pleistocene synchronous enhancement of East Asianwinter and summer monsoons revealed by Chinese loess record
	Han, Wenxia; Fang, Xiaomin; Berger, Andre
	2012
发表期刊	QUATERNARY RESEARCH
ISSN	0033-5894
卷号	78 期号:2 页码:174-184
关键词	Mid-pleistocene Climatic Transition Asian Monsoon Evolution Chinese
摘要	The mid-Pleistocene transition (MPT) of the global climate system, marked by a shift of previously dominant 41-ka cycles to lately dominant 100-ka cycles roughly in the mid-Pleistocene, is one of the fundamental enigma in the Quaternary climate evolution. The process and origin of the MPT remain of persistent interest and conjecture. Here we present high-resolution astronomically tuned magnetic susceptibility (MS) and grain-size records from a complete loess-paleosol sequence at Chaona on the central Chinese Loess Plateau. These two proxies are well-known sensitive indicators to the East Asian summer and winter monsoons, respectively. The records reveal a remarkable two-step simultaneous enhancement of the East Asian summer and winter monsoons at 0.9 Ma and 0.64 Ma, respectively, accompanied with an onset of a clear 100-ka cycle at 0.9 Ma and of a final, predominant 100-ka cycle starting at 0.64 Ma. The mid-Pleistocene stepwise rapid uplift of the Tibetan Plateau could be the mechanism driving the simultaneous enhancement of East Asian summer and winter monsoons and the shift of the periodicities during the kin by complex positive feedbacks. (c) 2012 University of Washington. Published by Elsevier Inc. All rights reserved. The mid-Pleistocene transition (MPT) of the global climate system, marked by a shift of previously dominant 41-ka cycles to lately dominant 100-ka cycles roughly in the mid-Pleistocene, is one of the fundamental enigma in the Quaternary climate evolution. The process and origin of the MPT remain of persistent interest and conjecture. Here we present high-resolution astronomically tuned magnetic susceptibility (MS) and grain-size records from a complete loess-paleosol sequence at Chaona on the central Chinese Loess Plateau. These two proxies are well-known sensitive indicators to the East Asian summer and winter monsoons, respectively. The records reveal a remarkable two-step simultaneous enhancement of the East Asian summer and winter monsoons at 0.9 Ma and 0.64 Ma, respectively, accompanied with an onset of a clear 100-ka cycle at 0.9 Ma and of a final, predominant 100-ka cycle starting at 0.64 Ma. The mid-Pleistocene stepwise rapid uplift of the Tibetan Plateau could be the mechanism driving the simultaneous enhancement of East Asian summer and winter monsoons and the shift of the periodicities during the kin by complex positive feedbacks. (c) 2012 University of Washington. Published by Elsevier Inc. All rights reserved.
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/2031
专题	青海盐湖研究所知识仓储
推荐引用方式 GB/T 7714	Han, Wenxia,Fang, Xiaomin,Berger, Andre. Tibet forcing of mid-Pleistocene synchronous enhancement of East Asianwinter and summer monsoons revealed by Chinese loess record[J]. QUATERNARY RESEARCH,2012,78(2):174-184.
APA	Han, Wenxia,Fang, Xiaomin,&Berger, Andre.(2012).Tibet forcing of mid-Pleistocene synchronous enhancement of East Asianwinter and summer monsoons revealed by Chinese loess record.QUATERNARY RESEARCH,78(2),174-184.
MLA	Han, Wenxia,et al."Tibet forcing of mid-Pleistocene synchronous enhancement of East Asianwinter and summer monsoons revealed by Chinese loess record".QUATERNARY RESEARCH 78.2(2012):174-184.

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