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Greenhouse gases modulate the strength of millennial-scale subtropical rainfall, consistent with future predictions
  • +4
  • Fei Guo,
  • Steven C Clemens,
  • Yuming Liu,
  • Ting Wang,
  • Huimin Fan,
  • Xingxing Liu,
  • Youbin Sun
Fei Guo
Institute of Earth Environment, CAS, Institute of Earth Environment, CAS

Corresponding Author:[email protected]

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Steven C Clemens
Brown University, Brown University
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Yuming Liu
Institute of Earth Environment, CAS, Institute of Earth Environment, CAS
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Ting Wang
Institute of Earth Environment, Chinese Adademy of Sciences, Institute of Earth Environment, Chinese Adademy of Sciences
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Huimin Fan
Institute of Earth Environment, Chinese Adademy of Sciences, Institute of Earth Environment, Chinese Adademy of Sciences
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Xingxing Liu
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences
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Youbin Sun
Institute of Earth Environment, Chinese Academy of Sciences, Institute of Earth Environment, Chinese Academy of Sciences
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Abstract

Millennial scale East Asian monsoon variability is closely associated with natural hazards through long-term variability in flood and drought cycles. Here we present a new East Asian summer monsoon (EASM) rainfall reconstruction from the northwest Chinese loess plateau spanning the past 650,000 years. The magnitude of millennial monsoon variability (MMV) in EASM rainfall is strongly linked to ice volume and greenhouse gas (GHG) at the 100,000-year earth-orbital eccentricity band and to GHG and summer insolation at the 23,000-year precession band. At the precession band, times of stronger insolation and increased atmospheric GHG lead to increases in the MMV of EASM rainfall. These findings indicate increased extreme precipitation events under future warming scenarios, consistent with model results.