WRF模式不同云微物理方案对华西秋雨模拟影响

Effect of different cloud microphysical parameterization schemes of WRF model on autumn precipitation over West China

利用WRF模式的5种云微物理方案对华西地区一次秋雨过程(2011年9月13—20日)进行了模拟,分析不同云微物理方案对华西秋雨的模拟能力,并对降水模拟差异的可能原因进行分析。结果表明:WRF模式的5种云微物理方案对华西秋雨均具有一定的模拟能力,可模拟出华西秋雨的夜雨特征,但Kessler方案模拟的降水落区偏小且降水强度偏弱,而Lin方案模拟的降水强度则偏强;相对来说,Ferrier和WSM3方案对华西秋雨主要降水过程的模拟效果较好。对比WRF模式5种不同云微物理方案对华西秋雨过程的模拟可知,各方案模拟的区域降水强度与WRF模式模拟的上升运动的强弱存在较好的一致性。

In this paper,an autumn precipitation event on September 13 to 20,2011 over the West China was simulated using the WRF model with five different cloud microphysical parameterization schemes. The simulated results were compared and possible reasons of precipitation changes among different experiments were analyzed. The results showthat every scheme can be used in the simulation of the autumn rainfall in the West China,and each of them can well generate night rain. However,the falling area of simulated rainfall and its intensity are underestimated by the Kessler cloud microphysical parameterization scheme,Simulated precipitation intensity is stronger when using the Lin scheme. In general,the main precipitation processes are simulated better with the Ferrier and WSM3 schemes. By comparing simulation results of five different cloud microphysical parameterization schemes,it is found that the precipitation intensities simulated by five schemes are of good association with the upward motion strength simulated by the WRF model.