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Hemisphere-asymmetric tropical cyclones response to anthropogenic aerosol forcing

Author

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  • Jian Cao

    (Nanjing University of Information Science and Technology
    Nanjing University of Information Science and Technology)

  • Haikun Zhao

    (Nanjing University of Information Science and Technology)

  • Bin Wang

    (Nanjing University of Information Science and Technology
    University of Hawaii at Mānoa)

  • Liguang Wu

    (Fudan University)

Abstract

How anthropogenic forcing could change tropical cyclones (TCs) is a keen societal concern owing to its significant socio-economic impacts. However, a global picture of the anthropogenic aerosol effect on TCs has not yet emerged. Here we show that anthropogenic aerosol emission can reduce northern hemisphere (NH) TCs but increase southern hemisphere (SH) TCs primarily through altering vertical wind shear and mid-tropospheric upward motion in the TC formation zones. These circulation changes are driven by anthropogenic aerosol-induced NH-cooler-than-SH and NH-increased versus SH-decreased meridional (equator to mid-latitudes) temperature gradients. The cooler NH produces a low-level southward cross-equatorial transport of moist static energy, weakening the NH ascent in the TC formation zones; meanwhile, the increased meridional temperature gradients strengthen vertical wind shear, reducing NH TC genesis. The opposite is true for the SH. The results may help to constrain the models’ uncertainty in the future TC projection. Reduction of anthropogenic aerosol emission may increase the NH TCs threat.

Suggested Citation

  • Jian Cao & Haikun Zhao & Bin Wang & Liguang Wu, 2021. "Hemisphere-asymmetric tropical cyclones response to anthropogenic aerosol forcing," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-27030-z
    DOI: 10.1038/s41467-021-27030-z
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    References listed on IDEAS

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    Cited by:

    1. Cong Gao & Lei Zhou & Chunzai Wang & I.-I. Lin & Raghu Murtugudde, 2022. "Unexpected limitation of tropical cyclone genesis by subsurface tropical central-north Pacific during El Niño," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    2. Junhua Yang & Shichang Kang & Deliang Chen & Lin Zhao & Zhenming Ji & Keqin Duan & Haijun Deng & Lekhendra Tripathee & Wentao Du & Mukesh Rai & Fangping Yan & Yuan Li & Robert R. Gillies, 2022. "South Asian black carbon is threatening the water sustainability of the Asian Water Tower," Nature Communications, Nature, vol. 13(1), pages 1-11, December.

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