Abstract: The dynamical and thermodynamic characteristics of typhoon Matsa (0509) were analyzed in vertical circulation, vorticity, divergence and temperature/humidity structure, based on the successful simulation in terms of track, intensity and internal structure of Matsa by using the high resolution mesoscale model MM5.The results show that the obviously asymmetric distribution of cyclone low-level structure effectes the development of mesoscale systems and the precipitation. The modified non-geostrophic wet Q vector convergence centre and the positive vorticity filed on the 500hPa upper level is directly associated with the position of heavy rain caused by the typhoon.

Key words: typhoon MATSA, numerical simulation, structure analysis

摘要： 利用中尺度数值模式MM5，成功地模拟了0509号台风“麦莎”的路径、强度及其内部结构。根据模式输出的高分辨率结果分析了“麦莎”的动力和热力特征，包括环流结构、涡度、散度以及温湿场。结果表明：气旋低层的动力场及温湿场的明显不对称分布，加强了系统内部的上升运动；Q矢量散度辐合中心与强降水有很好的对应关系，500hPa高度场上强Q矢量散度辐合区域以及正涡度区对地面强降水中心有很好的指示作用。

关键词: 台风麦莎, 数值模拟, 结构分析