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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/cp-2019-93
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2019-93
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 12 Aug 2019

Submitted as: research article | 12 Aug 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).

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

Fucai Duan1, Zhenqiu Zhang2,3, Yi Wang4,5, Jianshun Chen1, Zebo Liao3, Shitao Chen3, Qingfeng Shao3, and Kan Zhao3 Fucai Duan et al.
  • 1College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
  • 2School of Life Sciences, Nanjing Normal University, Nanjing 210023, China
  • 3College of Geography Science, Nanjing Normal University, Nanjing 210023, China
  • 4Department of Geography and School of Global Studies, University of Sussex, Falmer, Brighton BN1 9QJ, UK
  • 5Department of Earth System Science, Institute for Global Change Studies, Tsinghua University, Beijing 100084, China

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.

Fucai Duan et al.
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Short summary
We reconstruct a detailed history of the East Asian summer monsoon (EASM) using stalagmite records in central China during the last millennium. We estimate responses of the EASM to anthropogenic global warming, by comparing its relative intensity between the Current Warm Period and Medieval Climate Anomaly, two recent warm periods. Besides, we study potential links of the EASM to the Tropical Pacific and North Atlantic oceans. This work advances our understanding of the EASM dynamics.
We reconstruct a detailed history of the East Asian summer monsoon (EASM) using stalagmite...
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