边界层参数化对“雅安天漏”降水数值模拟的影响

Impact of Boundary Layer Parameterization on Numerical Simulation of "Ya-An-Tian-Lou"

选取了2001年7月3个“雅安天漏”个例,采用非静力中尺度数值模式MM5V3进行模拟,着重研究了MRF边界层参数化方案对雨量中心强度和雨区分布的影响,结果发现MRF方案的总体预报效果较好,并能很好地刻画雅安暴雨时的纬向垂直环流结构;在复杂地形条件下,特别是降水有明显日变化的地区,边界层的作用非常重要。

Using nonhydrostatic mesoscale numerical model MM5V3 to conduct simulation for 3 ＂Ya-An-Tian-Lou＂ cases, special analysis is made to see the impact of boundary layer （BL） parameterization scheme MRF on the maximum intensity of rainfall and the distribution of rain area. The results show that MRF scheme has good forecast effect, and can describe the zonal-vertical circulation structure when rainstorm occurs in Ya＇an; Under the condition of complex topography, the role of BL is very important, especially where the precipitation has obvious daily change .