The interactions between anthropogenic aerosols and the East Asian summer monsoon using RegCCMS

作者：Tongjiang Wang, Bingliang Zhuang, S. Li, Jane Liu, Min Xie, Chengjie Yin, Yazhou Zhang, Cheng Yuan, Jialei Zhu, Liuqing Ji, Yong Han · 发表于：Journal of Geophysical Research Atmospheres · 年份：2015 · DOI：10.1002/2014jd022877 · 被引用次数：63 · 研究领域：Atmospheric chemistry and aerosols、Atmospheric aerosols and clouds、Atmospheric Ozone and Climate

Abstract An online coupled regional climate‐chemistry model called RegCCMS is used to investigate the interactions between anthropogenic aerosols and the East Asian summer monsoon (EASM) over East Asia. The simulation results show that the mean aerosol loading and optical depth over the region are 17.87 mg/m 2 and 0.25, respectively. Sulfate and black carbon (BC) account for approximately 61.2% and 7.8% of the total aerosols, respectively. The regional mean radiative forcing (RF) is approximately −3.64, −0.55, and +0.88 W/m 2 at the top of the atmosphere for the total aerosol effect, the total aerosol direct effect, and the BC direct effect, respectively. The surface direct RF of BC accounts for approximately 31% of the total RF of all aerosols. Because of the total aerosol effect, both the energy budgets and air temperature are considerably reduced in the region with high aerosol loadings, leading to decreases in the land‐ocean air temperature gradient in summer. The total column‐absorbed solar radiation and surface air temperature decrease by 8.4 W/m 2 and 0.31 K, respectively. This cooling effect weakens horizontal and vertical atmospheric circulations over East Asia. The wind speed at 850 hPa decreases by 0.18 m/s, and the precipitation decreases by 0.29 mm/d. The small responses of solar radiation, air temperature, and atmospheric circulations to the BC warming effect are opposite to those of the total aerosol effect. The BC‐induced enhancement of atmospheric circulation...