A Sensibility Experiment of Different Cumulus Parameterization and Microphysics Schemes on Rainstorm Forecast in Southern Shanxi

doi:10.11924/j.issn.1000-6850.casb16020029

Abstract

Abstract: Based on WRF (Weather Research and Forecast system) mesoscale model, a heavy rainfall during July 29-30, 2007 in southern Shanxi was simulated, and numerical sensitive experiments were carried out to evaluate 3 cumulus parameterization schemes and 4 microphysics schemes. The precipitation forecast with different schemes was experimented contrastively and verified, and a preliminary evaluation was presented with regard to each scheme. The results indicated that: there were obvious differences in fine domain’s simulated precipitation location when different cumulus parameterization schemes were used in the coarse domain, and the belt distribution and intensity of the simulated precipitation by GF cumulus scheme was closer to the fact than others. TS score of simulated strong rainfall could be improved by 0.19 with the appropriate cumulus scheme. Different microphysics schemes had a significant influence on the simulated position, intensity and dispersibility of heavy rainfall center, and WDM6 microphysics scheme had strong capacity than others to simulate this heavy rainfall. Further research demonstrated that the increase of mass variables in the microphysics scheme could modify the numerical rainfall prediction performance, and double-moment microphysical schemes including number variables performed better in simulated precipitation, especially in the TS score of heavy rain.

CLC Number:

P435

Dong Chunqing,Zhao Guixiang,Yan Hui,Guo Yuanyuan and Li Qingqing. A Sensibility Experiment of Different Cumulus Parameterization and Microphysics Schemes on Rainstorm Forecast in Southern Shanxi[J]. Chinese Agricultural Science Bulletin, 2016, 32(14): 169-175.

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