TBB-Nudging Four-Dimensional Data Assimilation Method and Simulations on Heavy Rain Process in Wuhan on 20 July, 1998
卫星亮温资料四维同化方案及其对"7·20"武汉特大暴雨的模拟试验

The TBB data are directly adopted in nudging four-dimensional data assimilation process of meso-scale model MM5V2. A technique to calculate the height of cloud top through analysis nudging process is put forward. With the hourly TBB -nudging method, the heavy rainfall process happening in Wuhan on 20 July, 1998 is successfully simulated. Result shows that the meso-scale vortex and lower level southwest jet are the main systems causing Wuhan July 20 heavy rain. These results suggest that the accuracy of heavy rain forecast may be improved with remote sensing data such as TBB assimilated into numerical model.