THE IMPACT OF RADIATIVE PROCESSES ON THE ONSET OF SUMMER MONSOON——NUMERICAL EXPERIMENTS

Two numerical experiments were performed by using ECMWF limited area model in order to assess the impact of radiative processes on the onset of summer monsoon.The control experiment includes all model physics and the other experiment is exclusive of radiative processes.The simulated results show that the radiative processes enhanced the monsoon circulation and the associated vertical circulation over South Asia.Especially over the Qinghai-Xizang Plateau,the build-up of the plateau monsoon depression and the beginning of the plateau rainy season are highly dependent upon the radiative processes.Through the radiation-cloud interaction,the "moist processes" were enhanced over land.More latent heat was released.The feedback of the physical processes caused the strengthening of the monsoon circulation over southern Asia.