一次梅雨锋暴雨在不同物理过程下的模拟结果比较

本文研究对象为2005年7月江淮流域的一次梅雨锋暴雨，通过选择WIKF模式中五组不同的微物理方案和积云参数化方案，进行两重网格嵌套模拟。并对模拟结果进行诊断分析。通过比较得出如下结论：Betts—Miller-Janjic方案与Ferrier（new Eta）微物理方案的组合最能模拟出降水雨带的方向、位置和雨量，其次是New—Kain—Fritsch和Ferrier（new Eta）方案的组合，而且细网格的模拟效果更好；积云参数化方案的选择比微物理方案的选择对降水模拟的影响大；当微物理方案相同时，Betrs—Miller-janjic方案比New—Kain—Fritsch方案在细网格模拟下更准确反映梅雨锋暴雨的热力结构和垂直运动的特征，对暴雨的落区有一定指示作用。

Simulated results compare of a Meiyu Front Rainstorm in Different Physics Processes

Based on different physical processes, a meiyu front rainstorm of Jianghuai region in July 2005 is simulated with two grid and the results is analysed. It is shown that the scheme （Betts-Miller-Janjic and Ferrier） simulates the direction ,center of the rain and the precipitations best ,then the scheme （New-Kain-Fritsch and Ferrier）; cumulus convective parameterization schemes are better than physics option parameterization schemes in precipitation simulation ;when physics option parametrization schemes are same, Betts-Miller-Janjic reflects the characteristic of the heat structure and vertical motion more exactly.