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

Published online by Cambridge University Press:  08 June 2012

Wenxia Han ,
Xiaomin Fang  and
André Berger
Wenxia Han
Affiliation:
Key Lab of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China Institute of Tibet Plateau Research, Chinese Academy of Sciences, Beijing 100085, China
Xiaomin Fang*
Affiliation:
Institute of Tibet Plateau Research, Chinese Academy of Sciences, Beijing 100085, China
André Berger
Affiliation:
Université Catholique de Louvain, Institut d'Astronomie et de Géophysique G. Lemaître and Center for Earth and Climate Research, 2 Chemin du Cyclotron, B-1348 Louvain-la-Neuve, Belgium
*
⁎Corresponding author. Fax: + 86 10 6284 9886. Email Address:fangxm@itpcas.ac.cn
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Abstract

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 MPT by complex positive feedbacks.

Keywords

Mid-Pleistocene climatic transitionAsian monsoon evolutionChinese Loess PlateauAstronomical tuningTibetan Plateau uplift forcing
Type
Articles
Information
Quaternary Research , Volume 78 , Issue 2 , September 2012 , pp. 174 - 184
Copyright
University of Washington

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