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Book Chapter

Non-stationary response of Plio-Pleistocene East Asian winter monsoon variation to ice volume forcing

By
Youbin Sun
Youbin Sun
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academic of Sciences, Xian 710075, China
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Zhisheng An
Zhisheng An
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academic of Sciences, Xian 710075, China
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Steven C. Clemens
Steven C. Clemens
Department of Geology, Brown University, Providence, RI 02912-1846, USA
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Published:
January 01, 2010

Abstract

Recent progress both in studies of Chinese loess and deep-sea sediments have provided robust and longer records of winter monsoon variation and ice volume change back to the Late Miocene. However, when and how the winter monsoon became coupled with global ice volume change remains uncertain. Here we compare quartz grain size (a reliable winter monsoon proxy) generated from two loess-palaeosol and red clay sequences with a stacked benthic δ18O record (a global ice volume proxy). Our results indicate that at longer (>500 ka) timescales, the winter monsoon became strongly coupled with global ice volume change at 2.1 Ma, while at orbital timescales the winter monsoon variations started to be influenced by global ice volume change at c. 3.3 Ma. Correlation coefficients between these two records further indicate that winter monsoon intensity was strongly coupled with global ice volume change during intervals of 0–1.1 Ma, 1.4–1.8 Ma, and 2–2.85 Ma. In spite of these close connections amplitude mismatches between these two records are evident in terms of both long-term trend and glacial–interglacial fluctuations, suggesting that additional processes might have played a role in modulating the response of the winter monsoon variation to ice volume forcing.

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Contents

Geological Society, London, Special Publications

Monsoon Evolution and Tectonic–Climate Linkage in Asia

P. D. Clift
P. D. Clift
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R. Tada
R. Tada
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H. Zheng
H. Zheng
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Geological Society of London
Volume
342
ISBN electronic:
9781862395909
Publication date:
January 01, 2010

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