Analysis The Effects Of Raindrops Evaporation In Sever Convective Weather

In this essay, the routine upper-air, surface observation data and Doppler radar data are used to analyze and simulate the two different sever convective weather processes in Hubei Province with WRF v3.4 model . The evolution of two sever convective weather are analyzed from macro microcosmic perspective. At the same time, the sensitivity experiment of rainwater evaporation process was carried out.The results showed that:In the cirulation patterns of those two sever convective weather process, there are small troughs eastward, low-level southwest warm air flow and shear line with the precipitation process to provide adequate water vapor conditions. It can be simulated well by the WRF model in the cumulative precipitation, the result shows that radar reflectivity factors of Hong'an cases well. But in the case of Chongyang,the cumulative precipitation and the radar reflectivity factor of the model are harder than the actual.The main source process of rainwater in those two cases is melting of graupel,with the process of collection of cloud drop by raindrop and the melting of snow.The sink process is accretion of graupel and evaporation of raindrop, and there are weakened in the case of Chongyang in the process of raindrops' collection and snow melting.In the different sever convective weather, the effection of evaporation are different. In the case of Hong' an,the devolopment of convective be reduced by the reduce of evaporation, in the other hand, the devolopment will be change in the case of Chongyang, and case the precipitation in the ground.In addition to the different effects on the process of convection, the process of raindrop evaporation also influence the the convective weather in microstructure and microphysical processes, and there are differents affect in differents convection weather. For the two convective processes in this paper, the vertical distribution of particle and rainwater sink/source process has not changed much after reduce the evaporation of rainwater. However, the response of the water content and the sink/source of particle will be different in different convective weather processes by the change of evaporation.