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Deglacial variability of South China hydroclimate heavily contributed by autumn rainfall

Author

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  • Chengfei He

    (Nanjing University of Information Science and Technology
    The Ohio State University
    Open Studio for Ocean-Climate-Isotope Modeling, Pilot National Laboratory for Marine Science and Technology)

  • Zhengyu Liu

    (The Ohio State University)

  • Bette L. Otto-Bliesner

    (Climate and Global Dynamics Laboratory, National Center for Atmospheric Research)

  • Esther C. Brady

    (Climate and Global Dynamics Laboratory, National Center for Atmospheric Research)

  • Chenyu Zhu

    (Open Studio for Ocean-Climate-Isotope Modeling, Pilot National Laboratory for Marine Science and Technology
    Ocean University of China)

  • Robert Tomas

    (Climate and Global Dynamics Laboratory, National Center for Atmospheric Research)

  • Sifan Gu

    (Open Studio for Ocean-Climate-Isotope Modeling, Pilot National Laboratory for Marine Science and Technology
    Shanghai Jiao Tong University)

  • Jing Han

    (Peking University)

  • Yishuai Jin

    (Ocean University of China)

Abstract

The deglacial hydroclimate in South China remains a long-standing topic of debate due to the lack of reliable moisture proxies and inconsistent model simulations. A recent hydroclimate proxy suggests that South China became wet in cold stadials during the last deglaciation, with the intensification proposed to be contributed mostly by the East Asian summer monsoon (EASM). Here, based on a deglacial simulation in a state-of-the-art climate model that well reproduces the evolution of EASM, winter monsoon (EAWM) and the associated water isotopes in East Asia, we propose that the intensified hydroclimate in South China is also contributed heavily by the rainfall in autumn, during the transition between EASM and EAWM. The excessive rainfall in autumn results from the convergence between anomalous northerly wind due to amplified land-sea thermal contrast and anomalous southerly wind associated with the anticyclone over Western North Pacific, both of which are, in turn, forced by the slowdown of the Atlantic thermohaline circulation. Regardless the rainfall change, however, the modeled δ18Op remains largely unchanged in autumn. Our results provide new insights to East Asia monsoon associated with climate change in the North Atlantic.

Suggested Citation

  • Chengfei He & Zhengyu Liu & Bette L. Otto-Bliesner & Esther C. Brady & Chenyu Zhu & Robert Tomas & Sifan Gu & Jing Han & Yishuai Jin, 2021. "Deglacial variability of South China hydroclimate heavily contributed by autumn rainfall," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26106-0
    DOI: 10.1038/s41467-021-26106-0
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    References listed on IDEAS

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