气候变化领域集成服务门户(CCPortal): Reexamining the mechanisms of East Asian summer monsoon changes in response to non-East Asian anthropogenic aerosol forcing

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DOI	10.1175/JCLI-D-19-0550.1
	Reexamining the mechanisms of East Asian summer monsoon changes in response to non-East Asian anthropogenic aerosol forcing
	Wang Z.; Junyu M.U.; Yang M.; Xiaochao Y.U.
发表日期	2020
ISSN	0894-8755
起始页码	2929
结束页码	2944
卷号	33 期号:8
英文摘要	This study examines the mechanisms by which the East Asian summer monsoon (EASM) changes in response to non-East Asian (NEA) anthropogenic aerosol forcing by distinguishing the fast direct atmospheric response and slow ocean-mediated response to forcing using a global aerosol-climate coupled model. The results show that NEA aerosol forcing significantly exacerbates the weakening of the EASM due to local aerosol forcing. The fast response is dominant in the weakening of the EASM and an anomalous precipitation pattern over eastern China resembling the ''southern flood and northern drought'' pattern in the total response to NEA aerosol forcing. Changes in upper-tropospheric temperature caused by the fast response play a major role in the impact of NEA aerosol forcing on the EASM. Anomalous cooling occurs during summer in the upper troposphere (at;408N) over East Asia caused by the fast response. This is due to the combined effects of strong eastward cold advection in the Northern Hemisphere midlatitudes caused by increased aerosol loading in Europe and the resulting change in local meridional heat transport in East Asia. Subsequently, the zonal wind speed changes on either side of the anomalous cooling, and the East Asian subtropical jet shifts equatorward, thereby weakening the EASM. The changes in atmospheric temperature and the local Hadley cell caused by the slow response to NEA aerosol forcing are conducive to strengthening the southwesterly winds over eastern China. Our study suggests the importance of NEA aerosol forcing in driving changes in the EASM on a fast time scale. © 2020 American Meteorological Society.
英文关键词	Atmospheric thermodynamics; Climate models; Troposphere; Wind; Anthropogenic aerosols; Atmospheric response; East Asian summer monsoon; Meridional heat transports; Northern Hemispheres; Precipitation patterns; South-westerly winds; Tropospheric temperature; Aerosols; aerosol; atmospheric forcing; drought; flood; monsoon; Northern Hemisphere; precipitation (climatology); summer; China; Europe
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171350
作者单位	State Key Laboratory of Severe Weather and Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China; State Key Laboratory of Severe Weather and Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing, China; Institute of Urban Meteorology, China Meteorological Administration, Beijing, China
推荐引用方式 GB/T 7714	Wang Z.,Junyu M.U.,Yang M.,et al. Reexamining the mechanisms of East Asian summer monsoon changes in response to non-East Asian anthropogenic aerosol forcing[J],2020,33(8).
APA	Wang Z.,Junyu M.U.,Yang M.,&Xiaochao Y.U..(2020).Reexamining the mechanisms of East Asian summer monsoon changes in response to non-East Asian anthropogenic aerosol forcing.Journal of Climate,33(8).
MLA	Wang Z.,et al."Reexamining the mechanisms of East Asian summer monsoon changes in response to non-East Asian anthropogenic aerosol forcing".Journal of Climate 33.8(2020).