Chinese cave records and the East Asia Summer Monsoon
Chinese cave records and the East Asia Summer Monsoon
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中国洞穴记录与东亚夏季风
DOI：
10.1016/j.quascirev.2013.10.021
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发表时间：
2014-01-01
影响因子：
4
通讯作者：
Yang, Hao
中科院分区：
文献类型：
--
作者：
Liu, Zhengyu;Wen, Xinyu;Yang, Hao
中国东南部的洞穴沉积记录为过去的环境变化提供了重要证据。然而，这些代用指标的气候解释仍然存在很大的争议。早期的工作解释了洞穴三角洲18 O信号与东亚夏季风（EASM）或中国上游季风降水的区域性降雨。最近的同位素模拟支持后者，但在中国的降水三角洲18 O和降雨之间的对应关系很少。在这里，我们研究了过去21,000年来气候和降水三角洲18 O的演变模型和观测。认识到东亚夏季风降水的区域差异，我们提出了一个解释中国三角洲18 O记录，调和其代表性的东亚夏季风和上游枯竭的驱动机制。δ 18 O记录确实代表了东亚夏季风系统的强度。季风强度的最佳特征是增强的偏南季风风，这与中国上空的负三角洲18 O和增强的季风降水在北方中国，以及在上游地区的大陆尺度亚洲季风降水响应密切相关。(C)2013爱思唯尔有限公司保留所有权利。
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 delta 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 delta 18O and rainfall in China. Here, we examine the evolution of the climate and precipitation delta 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 delta 18O record that reconciles its representativeness of EASM and its driving mechanism of upstream depletion. The delta 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 delta 18O over China and enhanced monsoon rainfall in northern China, as well as the continental scale Asian monsoon rainfall response in the upstream regions. (C) 2013 Elsevier Ltd. All rights reserved.