Glacial-Interglacial Indian Summer Monsoon Dynamics

作者：Zhisheng An, Steven C. Clemens, Ji Shen, Xiaoke Qiang, Zhangdong Jin, Youbin Sun, Warren L Prell, Jing‐Jia Luo, Sumin Wang, Hai Xu, Yanjun Cai, Weijian Zhou, Xiaodong Liu, Weiguo Liu, Zhengguo Shi, Libin Yan, Xiayun Xiao, Hong Chang, Feng Wu, Li Ai, Fengyan Lu · 发表于：Science · 年份：2011 · DOI：10.1126/science.1203752 · 被引用次数：553 · 研究领域：Geology and Paleoclimatology Research、Pleistocene-Era Hominins and Archaeology、Geological formations and processes

The modern Indian summer monsoon (ISM) is characterized by exceptionally strong interhemispheric transport, indicating the importance of both Northern and Southern Hemisphere processes driving monsoon variability. Here, we present a high-resolution continental record from southwestern China that demonstrates the importance of interhemispheric forcing in driving ISM variability at the glacial-interglacial time scale as well. Interglacial ISM maxima are dominated by an enhanced Indian low associated with global ice volume minima. In contrast, the glacial ISM reaches a minimum, and actually begins to increase, before global ice volume reaches a maximum. We attribute this early strengthening to an increased cross-equatorial pressure gradient derived from Southern Hemisphere high-latitude cooling. This mechanism explains much of the nonorbital scale variance in the Pleistocene ISM record.