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Southern Hemisphere forcing of South Asian monsoon precipitation over the past ~1 million years

Author

Listed:
  • D. Gebregiorgis

    (GEOMAR Helmholtz Centre for Ocean Research Kiel
    Georgia State University)

  • E. C. Hathorne

    (GEOMAR Helmholtz Centre for Ocean Research Kiel)

  • L. Giosan

    (Woods Hole Oceanographic Institution)

  • S. Clemens

    (Brown University)

  • D. Nürnberg

    (GEOMAR Helmholtz Centre for Ocean Research Kiel)

  • M. Frank

    (GEOMAR Helmholtz Centre for Ocean Research Kiel)

Abstract

The orbital-scale timing of South Asian monsoon (SAM) precipitation is poorly understood. Here we present new SST and seawater δ18O (δ18Osw) records from the Bay of Bengal, the core convective region of the South Asian monsoon, over the past 1 million years. Our records reveal that SAM precipitation peaked in the precession band ~9 kyrs after Northern Hemisphere summer insolation maxima, in phase with records of SAM winds in the Arabian Sea and eastern Indian Ocean. Precession-band variance, however, accounts for ~30% of the total variance of SAM precipitation while it was either absent or dominant in records of the East Asian monsoon (EAM). This and the observation that SAM precipitation was phase locked with obliquity minima and was sensitive to Southern Hemisphere warming provides clear evidence that SAM and EAM precipitation responded differently to orbital forcing and highlights the importance of internal processes forcing monsoon variability.

Suggested Citation

  • D. Gebregiorgis & E. C. Hathorne & L. Giosan & S. Clemens & D. Nürnberg & M. Frank, 2018. "Southern Hemisphere forcing of South Asian monsoon precipitation over the past ~1 million years," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-07076-2
    DOI: 10.1038/s41467-018-07076-2
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    Cited by:

    1. Yiping Yang & Lanlan Zhang & Liang Yi & Fuchang Zhong & Zhengyao Lu & Sui Wan & Yan Du & Rong Xiang, 2023. "A contracting Intertropical Convergence Zone during the Early Heinrich Stadial 1," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Ye Tian & Dominik Fleitmann & Qiong Zhang & Lijuan Sha & Jasper. A. Wassenburg & Josefine Axelsson & Haiwei Zhang & Xianglei Li & Jun Hu & Hanying Li & Liang Zhao & Yanjun Cai & Youfeng Ning & Hai Che, 2023. "Holocene climate change in southern Oman deciphered by speleothem records and climate model simulations," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    3. Zhengquan Yao & Xuefa Shi & Zhengtang Guo & Xinzhou Li & B. Nagender Nath & Christian Betzler & Hui Zhang & Sebastian Lindhorst & Pavan Miriyala, 2023. "Weakening of the South Asian summer monsoon linked to interhemispheric ice-sheet growth since 12 Ma," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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