A Model Investigation of Aerosol‐Induced Changes in the East Asian Winter Monsoon

Zhen Liu; Yi Ming; Lin Wang; Massimo Bollasina; Ming Luo; Ngar‐cheung Lau; Steve Hung‐lam Yim

doi:10.1029/2019GL084228

A Model Investigation of Aerosol‐Induced Changes in the East Asian Winter Monsoon

Zhen Liu, Yi Ming, Lin Wang, Massimo Bollasina, Ming Luo, Ngar‐cheung Lau, Steve Hung‐lam Yim

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Abstract / Description of output

The response of the East Asian winter monsoon (EAWM) circulation to aerosols is studied using a coupled atmosphere‐slab ocean general circulation model. In the extratropics, the aerosol‐induced cooling in the mid‐latitudes leads to an intensified subtropical jet stream, a deepened East Asian trough, and thus an enhanced EAWM. In the tropics, the local Hadley circulation shifts southward to compensate for the interhemispheric asymmetry in aerosol radiative cooling. Anomalous subsidence at around 10°N leads to a salient anticyclone to the southwest of the Philippines. The associated southwesterlies advect abundant moisture to South China, resulting in local precipitation increase and suggesting a weaker EAWM. The EAWM response to aerosol forcing is thus driven by a competition between tropical and extratropical mechanisms, which has important implications for the future monsoon evolution as aerosol changes may follow different regional‐dependent trajectories.

Original language	English
Journal	Geophysical Research Letters
DOIs	https://doi.org/10.1029/2019GL084228
Publication status	Published - 23 Aug 2019

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10.1029/2019GL084228

109266340. Bollasina. AAMAccepted author manuscript, 1.69 MBLicence: All Rights Reserved

https://onlinelibrary.wiley.com/doi/abs/10.1029/2019GL084228

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title = "A Model Investigation of Aerosol‐Induced Changes in the East Asian Winter Monsoon",

abstract = "The response of the East Asian winter monsoon (EAWM) circulation to aerosols is studied using a coupled atmosphere‐slab ocean general circulation model. In the extratropics, the aerosol‐induced cooling in the mid‐latitudes leads to an intensified subtropical jet stream, a deepened East Asian trough, and thus an enhanced EAWM. In the tropics, the local Hadley circulation shifts southward to compensate for the interhemispheric asymmetry in aerosol radiative cooling. Anomalous subsidence at around 10°N leads to a salient anticyclone to the southwest of the Philippines. The associated southwesterlies advect abundant moisture to South China, resulting in local precipitation increase and suggesting a weaker EAWM. The EAWM response to aerosol forcing is thus driven by a competition between tropical and extratropical mechanisms, which has important implications for the future monsoon evolution as aerosol changes may follow different regional‐dependent trajectories.",

author = "Zhen Liu and Yi Ming and Lin Wang and Massimo Bollasina and Ming Luo and Ngar‐cheung Lau and Yim, {Steve Hung‐lam}",

note = "Met Office Climate Science for Service Partnership China as part of the Newton Fund for supporting Zhen Liu and Massimo A. Bollasina on the paper revision effort. ",

year = "2019",

month = aug,

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doi = "10.1029/2019GL084228",

language = "English",

journal = "Geophysical Research Letters",

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T1 - A Model Investigation of Aerosol‐Induced Changes in the East Asian Winter Monsoon

AU - Liu, Zhen

AU - Ming, Yi

AU - Wang, Lin

AU - Bollasina, Massimo

AU - Luo, Ming

AU - Lau, Ngar‐cheung

AU - Yim, Steve Hung‐lam

N1 - Met Office Climate Science for Service Partnership China as part of the Newton Fund for supporting Zhen Liu and Massimo A. Bollasina on the paper revision effort.

PY - 2019/8/23

Y1 - 2019/8/23

N2 - The response of the East Asian winter monsoon (EAWM) circulation to aerosols is studied using a coupled atmosphere‐slab ocean general circulation model. In the extratropics, the aerosol‐induced cooling in the mid‐latitudes leads to an intensified subtropical jet stream, a deepened East Asian trough, and thus an enhanced EAWM. In the tropics, the local Hadley circulation shifts southward to compensate for the interhemispheric asymmetry in aerosol radiative cooling. Anomalous subsidence at around 10°N leads to a salient anticyclone to the southwest of the Philippines. The associated southwesterlies advect abundant moisture to South China, resulting in local precipitation increase and suggesting a weaker EAWM. The EAWM response to aerosol forcing is thus driven by a competition between tropical and extratropical mechanisms, which has important implications for the future monsoon evolution as aerosol changes may follow different regional‐dependent trajectories.

AB - The response of the East Asian winter monsoon (EAWM) circulation to aerosols is studied using a coupled atmosphere‐slab ocean general circulation model. In the extratropics, the aerosol‐induced cooling in the mid‐latitudes leads to an intensified subtropical jet stream, a deepened East Asian trough, and thus an enhanced EAWM. In the tropics, the local Hadley circulation shifts southward to compensate for the interhemispheric asymmetry in aerosol radiative cooling. Anomalous subsidence at around 10°N leads to a salient anticyclone to the southwest of the Philippines. The associated southwesterlies advect abundant moisture to South China, resulting in local precipitation increase and suggesting a weaker EAWM. The EAWM response to aerosol forcing is thus driven by a competition between tropical and extratropical mechanisms, which has important implications for the future monsoon evolution as aerosol changes may follow different regional‐dependent trajectories.

U2 - 10.1029/2019GL084228

DO - 10.1029/2019GL084228

M3 - Article

SN - 0094-8276

JO - Geophysical Research Letters

JF - Geophysical Research Letters

ER -

A Model Investigation of Aerosol‐Induced Changes in the East Asian Winter Monsoon

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