Numerical simulation study of surface fluxes effects on different types of precipitation based on AREM

Taking the systemic precipitation process in Huaihe River basin during 3-4 July 2003 and the thermo-convective local precipitation process in Jiangxi during 2-3 August 2003 for example, the impacts of surface fluxes on two types of precipitation are studied by using numerical simulation based on AREM model. The analysis shows that the surface fluxes, by changing the stability of atmospheric stratification, affect the gathering and releasing of unstable energy in the atmosphere, thus influencing precipitation processes. Because of the different vapor sources, the different effects of the surface fluxes on two types of precipitation are remarkable. For the thermo-convective local precipitation which happened in Jiangxi province during 2-3 August 2003, the surface fluxes can influence not only the field of dynamic structure, but also the water vapor contents in the mid-and upper-level. In contrast the systemic precipitation which happened in Huaihe River basin during 3-4 July 2003 is relatively less influenced by surface fluxes. The surface fluxes only have a weak effect on the field of dynamic structure, but nearly no influences on the water vapor contents in the mid-and high-level.