Responses of the East Asian summer monsoon to aerosol forcing in CMIP5 models: The role of upper‐tropospheric temperature change,International Journal of Climatology

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Responses of the East Asian summer monsoon to aerosol forcing in CMIP5 models: The role of upper‐tropospheric temperature change
International Journal of Climatology ( IF 3.5 ) Pub Date : 2020-10-13 , DOI: 10.1002/joc.6887
Junyu Mu ₁ , Zhili Wang _{1,

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Affiliation

We quantitatively distinguish the fast and slow responses of the East Asian summer monsoon (EASM) to aerosol forcing using the outputs from 16 Coupled Model Intercomparison Project Phase 5 (CMIP5) models. The mechanism of the EASM change due to aerosol forcing is then evaluated from the perspective of upper‐tropospheric temperature change. The results show that aerosol forcing leads to the weakening of the EASM circulation and decreases in precipitation. The aerosol‐induced fast atmospheric response dominates the weakening of EASM and the decreased precipitation over the eastern China. In the fast response, upper‐tropospheric cooling in the mid‐latitudes of East Asia during summer changes the circulation structure, thereby causing the weakening of the EASM. The formation of upper‐tropospheric cooling is closely related to the eastward propagation of atmospheric cooling caused by aerosol forcing in Europe and the resulting change in local meridional heat transport. The slow ocean‐mediated response to aerosol forcing partially offsets the weakening of the EASM over the eastern China in the fast response. In the slow response, southwesterly wind is enhanced and precipitation is increased over the eastern China, while southwesterly wind is weakened over the northwestern Pacific and the South China Sea, which dominates the decrease in precipitation over the oceans. The aerosol‐induced changes of land–sea thermal contrasts further confirm that the decrease of upper‐tropospheric land–sea thermal contrasts over East Asia in the fast response plays a key role in driving the weakening of the EASM.

更新日期：2020-10-13

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