FY-3双星MWHS资料对江西暴雨的循环同化试验

为了提高卫星资料在同化系统中使用率及验证同化卫星资料的预报效果,采用循环同化方案并通过江西2012年5月11~14日的暴雨个例进行验证。试验设计了风三卫星MWHS资料的循环同化双星资料方案和单时次同化单星资料方案,并对方案的运行结果进行了分析。结果表明,使用MWHS资料可以改进湿度场和涡度场。相比单时次同化单星MWHS资料,循环同化双星MWHS资料方案能更好地改善湿度场和动力场,模拟的降水落区和强度更接近实况,其TS评分最优。单时次同化单星MWHS资料,选用降水期间探测的卫星资料同化效果更优。

FY-3 Binary Stars MWHS Data on Jiangxi Rainstorm Cycle Assimilation Experiment

In order to improve the utilization of satellite data in assimilation system and validate the influence of assim- ilating satellite data, this article takes example of heavy rains from May 11 to 14 , 2012 and designs two schemes in- cluding assimilating satellite FY-3A/B＇s MWHS data of double satellites circularly and single time-level assimilation of single one by using WRF-3DVAR system, then makes an analysis of the operating results. The result shows that the use of MWHS data could improve the moisture field and the vorticity field. Cycle assimilation scheme with the best TS score preferably improves the moisture field and dynamic field, and simulation rainfall＇ s area and intensity approaches the reality. It is better to use the data of satellite sounding in the rain when single time-level assimilation is made.