Decoupling of the East Asian summer monsoon and Indian summer monsoon between 20 and 17 ka |
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| Authors: | Xiuyang Jiang Yaoqi He Chuan-Chou Shen Shi-Yu Lee Bang Yang Ke Lin Zhizhong Li |
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| Institution: | 1. Key Laboratory of Humid Subtropical Eco-geographical Processes, Ministry of Education, College of Geography Science, Fujian Normal University, Fuzhou 350007, China;2. High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan;3. College of Tourism and Air Service, Guizhou Minzu University, Guiyang 550025, China;4. Research Center for Environment Changes, Academia Sinica, Taipei 11529, Taiwan |
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| Abstract: | Marine Oxygen Isotope Stage (MIS) 2, with its profound environmental and climatic changes from before the last glacial maximum (LGM) to the last deglaciation, is an ideal period for understanding the evolution of the East Asian summer monsoon (EASM) and Indian summer monsoon (ISM), two Asian monsoon sub-systems. With 875 stable oxygen isotope ratios and 43 230Th dates from stalagmites in Sanxing Cave, southwestern China, we construct and interpret a new, replicated, Asian summer monsoon (ASM) record covering 30.9–9.7 ka with decadal resolution. δ18O records from this site and other reported Chinese caves display similar long-term orbitally dominated trends and synchronous millennial-scale strong and weak monsoonal events associated with climate changes in high northern latitudes. Interestingly, Sanxing δ18O and Arabian Sea records show a weakening ISM from 22 to 17 ka, while the Hulu and Qingtian records from East and Central China express a 3-ka intensifying EASM from 20 to 17 ka. This decoupling between EASM and ISM may be due to different sensitivities of the two ASM sub-systems in response to internal feedback mechanisms associated with the complex geographical or land-ocean configurations. |
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| Keywords: | East Asian summer monsoon Indian summer monsoon MIS 2 Decoupling Stalagmite |
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