摘要
The Regional Atmospheric Modeling System (RAMS) has been used to investigate the effects of varied giant cloud condensation nuclei (GCCN) concentrations on precipitation characteristics of the spring hailstorms in a semi-arid region. The simulation result shows that this variation has significant effects on the storm microphysical processes as well as on the surface precipitation. The coverage of hail and hail mixing ratio maxima in cloud increases with greater GCCN concentrations. The accumulation zone structure benefits the growth of hail particles. Higher GCCN concentrations lead to more supercooled rain water and cloud water available for freezing. This simulation also shows that increasing GCCN concentrations may produce more rainfall on the surface but less hail precipitation, and the total accumulated precipitation increases while the ice phase precipitation decreases. This effect is stronger in polluted air than in clean air. The surface flow field changes with different GCCN concentrations. The identification index of spring hailstorm is different from that of summer hailstorm with a different aerosol background.
The Regional Atmospheric Modeling System （RAMS） has been used to investigate the effects of varied giant cloud condensa- tion nuclei （GCCN） concentrations on precipitation characteristics of the spring hailstorms in a semi-arid region. The simula- tion result shows that this variation has significant effects on the storm microphysical processes as well as on the surface pre- cipitation. The coverage of hail and hail mixing ratio maxima in cloud increases with greater GCCN concentrations. The ac- cumulation zone structure benefits the growth of hail particles. Higher GCCN concentrations lead to more supercooled rain water and cloud water available for freezing. This simulation also shows that increasing GCCN concentrations may produce more rainfall on the surface but less hail precipitation, and the total accumulated precipitation increases while the ice phase precipitation decreases. This effect is stronger in polluted air than in clean air. The surface flow field changes with different GCCN concentrations. The identification index of spring hailstorm is different from that of summer hailstorm with a different aerosol background.
基金
supported by National Natural Science Foundation of China (Grant Nos. 40875080 and 40875002)
Ministry of Science and Technology of China (Grant No. 2006BAC12B01-01)
