单部多普勒天气雷达风场反演及其在数值预报中的应用试验

WIND-FIELD RETRIEVAL THROUGH SINGLE DOPPLER WEATHER RADAR AND ITS APPLICATION TO NWP

针对 1 998年 7月 5日下午到夜间北京地区出现的一次强降雨过程 ,采用“局部VAD法” ,对中国气象科学研究院多普勒雷达测得的 1 998年 7月 5日 1 2 :0 0UTC的径向风反演成水平风 ,并将反演风应用到数值天气预报 (NWP)同化系统中 ,进行了同化预报试验。结果表明 ,反演的雷达风基本符合事实 ,将其应用到NWP中 。

The local VAD method is used for the wind retrieval from radical wind measure d by Doppler radar (data from CAMS, at 12: 00UTC, 5 July 1998) into horizontal wind and an experiment is made on the impact of horizontal wind on numerical wea ther prediction assimilation system for the heavy rain occurred from afternoon t o night of 5 July 1998 in the Beijing area. The result shows that the retrieved wind is primarily consistent with the weather process and it can be used in the analysis and prediction of mesoscale systems with smaller temporal and spatial s cales.