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Abstract
Abstract The different spatial distributions of aerosol-induced direct radiative forcing and climatic effects ina weak (2003) and a strong (2006) East Asian summermonsoon (EASM) circulation were simulated using ahigh-resolution regional climate model (RegCM3). Resultsshowed that the atmospheric circulations of summermonsoon have direct relations with transport of aerosolsand their climatic effects. Both the top-of-the-atmosphere(TOA) and the surface-negative radiative forcing of aerosolswere stronger in weak EASM circulations. The maindifference in aerosol-induced negative forcing in twosummers varied between 2 and 14 W m-2 from the Sichuan Basin to North China, where a maximum in aerosol-induced negative forcing was also noticed in theEASM-dominated areas. The spatial difference in thesimulated aerosol optical depth (AOD) in two summersgenerally showed the similar pictures. Surface coolingeffects induced by aerosols were spatially more uniformin weak EASM circulations and cooler by about 1-4.5°C.A preliminary analysis here indicated that a weakerlow-level wind speed not conducive to the transport anddiffusion of aerosols could make more contributions tothe differences in the two circulations.