Chinese cave records and the East Asia Summer Monsoon

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• 作者：Zhengyu Liu ; Xinyu Wen ; E.C. Brady ; B. Otto-Bliesner ; Ge Yu ; Huayu Lu ; Hai Cheng ; Yongjin Wang ; Weipeng Zheng ; Yihui Ding ; R.L. Edwards ; Jun Cheng ; Wei Liu ; Hao Yang
• 关键词：East Asia summer monsoon ; Oxygen isotope ; Climate modeling ; Isotope modeling
• 刊名：Quaternary Science Reviews
• 出版年：1 January, 2014
• 年：2014
• 卷：83
• 期：Complete
• 页码：115-128
• 全文大小：7189 K

文摘

Speleothem records in southeastern China provide key evidence for past environmental changes. However, the climatic interpretation of these proxies has remained a great controversy. Earlier work interprets the cave 未¹⁸O signal associated with regional rainfall of the East Asia Summer Monsoon (EASM) or monsoon rainfall upstream of China. Recent isotope modeling supports the latter but show little correspondence between the precipitation 未¹⁸O and rainfall in China. Here, we examine the evolution of the climate and precipitation 未¹⁸O for the last 21,000 years in models and observations. Recognizing the regional difference of the EASM rainfall, we propose an interpretation of the Chinese 未¹⁸O record that reconciles its representativeness of EASM and its driving mechanism of upstream depletion. The 未¹⁸O records do represent the intensity of the EASM system. The monsoon intensity is best characterized by enhanced southerly monsoon winds, which correlate strongly with negative 未¹⁸O over China and enhanced monsoon rainfall in northern China, as well as the continental scale Asian monsoon rainfall response in the upstream regions.