不同物理过程参数化方案对梅雨锋暴雨的敏感性试验

以2005年7月上旬江淮流域的一次梅雨锋暴雨为研究对象,选取WRF模式中Lin和Ferrier两个微物理方案和KF、NKF、Betts-Miller-Janjic三个积云参数化方案,经过组合得到6组方案,进行两重网格嵌套模拟,对数值模拟结果进行分析比较。通过分析得出如下结论：6个方案均能模拟出降水雨带的走向、降水中心,其中Ferri-er和NKF方案及Ferrier和Betts-Miller-Janjic方案模拟的降水强度和分布与实况最接近;在模拟降水量时采用微物理方案Ferrier初始阶段效果好,采用微物理方案Lin在后期效果好;当微物理方案相同时,积云对流参数化方案的变化对垂直速度、假相当位温、相对比湿的反映敏感;粗网格采用一定的积云对流参数化后,可一定程度再现α中尺度特征。

Sensitive Experiment of Meiyu Front Rainstorm in Different Physics Processes

Based on a Meiyu front rainstorm of Jianghuai region in July 2005, it is simulated with two grids by different physics processes and the result is analyzed.It shows that all schemes can simulate the direction of the rain and the center of the precipitation,but the two schemes（New-Kain-Fritsch and Ferri er;Betts-Miller-Janjic and Ferrier） are consistent with the actualities;the si mulation of Ferrier is good in the initial stage,the simulation of Lin is good in the latter stage;when microphysical schemes are same,the changes of cumulus convective parameterization schemes impact on vertical velocity,pseudo-equiva lent potential temperature,and relative humidity are obvious;some cumulus conv ective parameterization scheme in wide grid is able to reproduce meso-α-scale vortex features.