登陆台风Winnie(1997)的数值模拟研究Ⅰ:结果检验和云系的模拟

NUMERICAL SIMULATION OF TYPHOON WINNIE(1997) AFTER LANDFALL PARTⅠ:MODEL VERIFICATION AND MODEL CLOUDS

摘要: 用非静力平衡的中尺度模式MM5(V2)对1997年11号台风Winnie在登陆后演变为温带气旋的过程进行了48h模拟。结果表明:MM5不仅比较好地模拟出台风在陆地上的移动路径及其产生的降水,而且成功地模拟出了台风登陆后次中心的产生。利用模拟大气中的水物质(云水、雨水、冰晶、雪水和霰)模拟了台风云图,很好地展示了在卫星实际观测的红外云图上,Winnie台风在登陆后其云系的结构从热带气旋的螺旋结构到温带气旋的锋面云系结构的转变过程。因此对Winnie台风的数值模拟可以作为深入研究台风登陆后从热带气旋演变为温带气旋的变性过程的基础。

Abstract: Using the Penn State-NCAR nonhydrostatic mesoscale model (MM5), the evolution of typhoon Winnie after landfall is simulated. Verified against observations, the track, minimum centerpressure, precipitation and in particular, the birth of secondary cyclone were well reproduced. Significantly, the model clouds made from water contents of out put favorably resemble the satellite infrared images, and also show the evolution of typhoon Winnie from tropical cyclone to extratropical cyclone after landing.