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Dynamics of Asian Summer Monsoon Response to Anthropogenic Aerosol Forcing
Wang, Hai2; Xie, Shang-Ping; Kosaka, Yu4; Liu, Qinyu1,2,5; Du, Yan6
Source PublicationJOURNAL OF CLIMATE
AbstractAnthropogenic aerosols partially mask the greenhouse warming and cause the reduction in Asian summer monsoon precipitation and circulation. By decomposing the atmospheric change into the direct atmospheric response to radiative forcing and sea surface temperature (SST)-mediated change, the physical mechanisms for anthropogenic-aerosol-induced changes in the East Asian summer monsoon (EASM) and South Asian summer monsoon (SASM) are diagnosed. Using coupled and atmospheric general circulation models, this study shows that the aerosol-induced troposphere cooling over Asian land regions generates anomalous sinking motion between 20 degrees and 40 degrees N and weakens the EASM north of 20 degrees N without SST change. The decreased EASM precipitation and the attendant wind changes are largely due to this direct atmospheric response to radiative forcing, although the aerosol-induced North Pacific SST cooling also contributes. The SST-mediated change dominates the aerosol-induced SASM response, with contributions from both the north-south interhemispheric SST gradient and the local SST cooling pattern over the tropical Indian Ocean. Specifically, with large meridional gradient, the zonal-mean SST cooling pattern is most important for the Asian summer monsoon response to anthropogenic aerosol forcing, resulting in a reorganization of the regional meridional atmospheric overturning circulation. While uncertainty in aerosol radiative forcing has been emphasized in the literature, our results show that the intermodel spread is as large in the SST effect on summer monsoon rainfall, calling for more research into the ocean-atmosphere coupling.
KeywordAtmosphere-ocean interaction Atmospheric circulation Monsoons Sea surface temperature Aerosols Anthropogenic effects
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Document Type期刊论文
Affiliation1.Ocean Univ China, Phys Oceanog Lab, Collaborat Innovat Ctr Marine Sci & Technol, Qingdao, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Qingdao, Peoples R China
3.Ocean Univ China, Coll Ocean & Atmospher Sci, Qingdao, Peoples R China
4.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA
5.Univ Tokyo, Res Ctr Adv Sci & Technol, Meguro Ku, Tokyo, Japan
6.Ocean Univ China, Phys Oceanog Lab CIMST, Qingdao, Peoples R China
7.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Wang, Hai,Xie, Shang-Ping,Kosaka, Yu,et al. Dynamics of Asian Summer Monsoon Response to Anthropogenic Aerosol Forcing[J]. JOURNAL OF CLIMATE,2019,32(3):843, 858.
APA Wang, Hai,Xie, Shang-Ping,Kosaka, Yu,Liu, Qinyu,&Du, Yan.(2019).Dynamics of Asian Summer Monsoon Response to Anthropogenic Aerosol Forcing.JOURNAL OF CLIMATE,32(3),843.
MLA Wang, Hai,et al."Dynamics of Asian Summer Monsoon Response to Anthropogenic Aerosol Forcing".JOURNAL OF CLIMATE 32.3(2019):843.
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