| In order to improve the simulation ability of the three-dimensional dynamic elec trical coupling storm model for cloud microphysical and electrical process,.The ice nucleus data of ice crystal concentration schem of Yin et al,N(T)= 0.0396 exp(0. 317-AT), obtained in northern China during 1963-2003, fit in the ice nucleus data o f north of China.The parameterization is used in this model. In addition, the ice cr ystal collision multiplication mechanism Yano and Phillips appears into the three-dim ensional dynamic electrical coupling strong storm modle. Through the simulation o fa thunderstorm process in Shaanxi of Xunyi, to test the simulation results of initia 1 ice concentration and ice crystal multiplication scheme. And through seeding differe nt concentration ice crystal in specific hight in the three-dimensional thunderstom model, to investigate the effect of initial ice crystal concentration to thunderstorm cl oud microphysical and electrical processes, especially the effect on the subsequent mul tiplication process. Test the simulation of the effect of the ice machine with new c ollision multiplication scheme,further discussed the influence of secondary ice collisi on multiplication mechanism of thunderstorm cloud microphysical and electrical proce ss. The main conclusions are as follows:(1)Seeding different concentration ice crystals will affect the total amount of ice crystals in the initial concentration was positively correlated with seed yield secondar y ice.(2)Different concentrations of the initial number ice crystals affect the graupe 1 spatial distribution and concentration in the core of thunderstorm. In mature and dis sipating stages significantly, resulting in large differences in the thunderstorm clou d charge structure. High initial ice seeding led to the lightning appear earlier and light ning frequency increased significantly.(3)Add Yano and Phillips ice crystal collision multiplication mechanism, the heig ht distribution in the initial stage of thunderstorm cloud ice particles will decrease, an d the significant increase in the concentration of ice particles,especially the concentr ation of graupel particles. In the mature stage of the thunderstorm,ice crystal rapidl y decrease and the ice concentration always less than without multiplication. The gr aupel concentration is higher in the whole life time of thunderstorms than without m ultiplication.(4)Add Yano and Phillips ice crystal collision multiplication mechanism to simul ate the charge structure is more complex. In thunderstorm cloud 8 ～9km in height produced a new charge area, although weak in charge, but also can form acomplete ch arge structure of thunderstorm, and discharge without multiplication inhibition of the f ormation of lightning. |
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