Variations in the East Asian summer monsoon over the past 1 millennium and their links to the Tropic Pacific and North 2 Atlantic oceans

Duan, Fucai, Zhang, Zhenqiu, Wang, Yi, Chen, Jianshun, Liao, Zebo, Chen, Shitao, Shao, Qingfeng and Zhao, Kan (2020) Variations in the East Asian summer monsoon over the past 1 millennium and their links to the Tropic Pacific and North 2 Atlantic oceans. Climate of the Past Discussions. ISSN 1814-9340

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Abstract

Variations of East Asian summer monsoon (EASM) during the last millennium could help enlighten the monsoonal response to future global warming. Here we present a precisely dated and highly resolved stalagmite δ18O record from the Yongxing Cave, central China. Our new record, combined with a previously published one from the same cave, indicates that the EASM has changed dramatically in association with the global temperature rising. In particular, our record shows that the EASM has intensified during the Medieval Climate Anomaly (MCA) and the Current Warm Period (CWP) but weakened during the Little Ice Age (LIA). We find that the EASM intensity is similar during the MCA and CWP periods in both northern and central China, but relatively stronger during the CWP in southern China. This discrepancy indicates a complicated regional response of the EASM to the anthropogenic forcing. The intensified and weakened EASM during the MCA and LIA matches well with the warm and cold phases of Northern Hemisphere surface air temperature, respectively. This EASM pattern also corresponds well with the rainfall over the tropical Indo-Pacific warm pool. Surprisingly, our record shows a strong association with the North Atlantic climate as well. The intensified (weakened) EASM correlates well with positive (negative) phases of North Atlantic Oscillation. In addition, our record links well with the strong (weak) Atlantic meridional overturning circulation during the MCA (LIA) period. All above-mentioned correlations indicate that the EASM tightly couples with oceanic processes in the tropical Pacific and North Atlantic oceans during the MCA and LIA.

Item Type: Article
Additional Information: This record reflected the discussed paper, the final record can be found - http://sro.sussex.ac.uk/id/eprint/89774/
Schools and Departments: School of Global Studies > Geography
Depositing User: Sharon Krummel
Date Deposited: 04 Sep 2019 16:37
Last Modified: 19 Mar 2020 11:43
URI: http://sro.sussex.ac.uk/id/eprint/85629

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Project NameSussex Project NumberFunderFunder Ref
UnsetUnsetZhejiang Provincial Natural Science FoundationLY19D020001
UnsetUnsetNational Natural Science Foundation of China41602181, 41572340 and 41572151