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A Model Investigation of Aerosol‐Induced Changes in the East Asian Winter Monsoon
Author(s) -
Liu Zhen,
Ming Yi,
Wang Lin,
Bollasina Massimo,
Luo Ming,
Lau NgarCheung,
Yim Steve HungLam
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl084228
Subject(s) - climatology , hadley cell , aerosol , atmospheric sciences , environmental science , monsoon , east asian monsoon , extratropical cyclone , subsidence , anticyclone , geology , climate change , oceanography , general circulation model , geography , meteorology , paleontology , structural basin
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 midlatitudes 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 increases 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.