WRF模式中不同参数化方案对华中地区一次强降水天气过程模拟的影响

Influence of Simulating Heavy Rainfall Process in Central China by Using Different Microphysics and Cumulus Parameterization Schemes in WRF Model

【目的】利用中尺度数值模式WRF(V3.6.1)和NCEP的FNL资料,模拟2013年7月5-6日华中地区的一次强降水天气过程。【方法】通过WRF模式中2种积云对流参数化方案和3种云微物理参数化方案的6种不同组合,考察不同微物理和积云对流参数化方案对此次降水过程模拟的影响,将模拟结果和24 h累计降水实况以及雷达回波观测进行对比分析。【结果】发现采用不同微物理和积云对流参数化方案的组合都能大致模拟出降水的落区和发展趋势,但模拟的强降水中心的位置和强度与实况相比存在一定偏差。【结论】总体来说,KFN方案与Kessler方案的组合以及G3方案与Lin方案的组合的模拟效果较好。结合ETS评分,不同的参数化方案对不同等级降水模拟的效果不同,整体模拟效果比较稳定的是WSM6方案和G3方案的组合。

【 Objective】 In this paper, a heavy rainfall occurred in central China during June 5 - 6 in 2013 was investigated by using the me- soscale numerical model WRF （V3. 6.1） and FNL NCEP data.【 Method】 Based on six different combinations of two cumulus convective pa-rameterization schemes and three cloud microphysics parameterization schemes, the influences of different parameterization schemes on the simulation of the precipitation process were studied, by comparing the observed 24-hour accumulated precipitation and radar echo with simu- lations.【 Result】 Results showed that the movements and the distribution of precipitation could roughly be simulated by using different param-eterization schemes. However, relative to the observations, the simulated location and intensity of heavy precipitation center has some basis.[Conclusion] In general, the simulation results of the combination of KFN scheme and Kessler scheme and the combination of Lin scheme and G3 scheme are pretty well. Combining the equitable threat score, the simulation effects of different parameterization schemes are different for different levels of precipitation and the combination of WSM6 scheme and G3 scheme has stable simulation effects.