Tibet forcing of mid-Pleistocene synchronous enhancement of East Asian winter and summer monsoons revealed by Chinese loess record
Tibet forcing of mid-Pleistocene synchronous enhancement of East Asian winter and summer monsoons revealed by Chinese loess record
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DOI：
10.1016/j.yqres.2012.05.001
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发表时间：
2012-09-01
影响因子：
2.3
通讯作者：
Berger, Andre
中科院分区：
文献类型：
--
作者：
Han, Wenxia;Fang, Xiaomin;Berger, Andre
中更新世全球气候系统的转换是第四纪气候演化的基本谜团之一，其标志是大约在中更新世，全球气候系统由以前占主导地位的41 ka周期向后来占主导地位的100 ka周期转变。MPT的过程和起源仍然是持续的兴趣和猜测。在这里，我们提出了高分辨率的天文调谐磁化率（MS）和粒度记录从一个完整的黄土-古土壤序列在中国黄土高原中部朝那。这两个代理是众所周知的东亚夏季风和冬季风的敏感指标，分别。记录显示，一个显着的两步同时增强东亚夏季风和冬季风分别在0.9 Ma和0.64 Ma，伴随着一个明确的100 ka周期的开始在0.9 Ma和一个最终的，占主导地位的100 ka周期开始在0.64 Ma。中更新世青藏高原的逐步快速隆升可能是东亚夏季风和冬季风同时增强和周期性转换的机制。(c)2012年华盛顿大学。爱思唯尔公司出版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.