中文摘要：

利用美国Goddard中心的云分辨尺度模式,对2007年7月2—9日江淮流域的一次暴雨过程进行了高分辨率的模拟研究。首先利用NCAR/NCEP再分析资料、地面降水观测以及卫星云图等常规和非常规观测资料,对此次降水过程开展了天气尺度分析,对过程降水特点有了初步了解;进而利用NCAR/NCEP再分析资料形成云模式大尺度强迫场,对降水过程开展了长度约8天的高分辨率数值模拟。通过观测与模拟的地面雨强以及雷达反射率等的对比分析发现,模式很好地模拟出了此次强降水过程的时空分布和演变特征,以及主要的雷达回波结构特点,模拟结果可用于进一步针对江淮流域地面强降水过程细致的定量诊断分析研究。

英文摘要：

A torrential rain event that occurred in the Jiang-Huai Rivers valley of China from 2 to 9 July 2007 is investigated by using the Goddard Cumulus Ensemble cloud-resolving model.At first,synoptic analysis is carried out by using re-analysis data,surface rainfall observations and satellite charts to give an elementary study on the characteristics of surface rainfall.Then the large-scale forcings for the above mentioned model are calculated from NCEP/NCAR data,and an 8-day-long high-resolution simulation is performed.Comparisons between observations and simulation in surface rain rates and radar reflectivities show that the model reproduces well the temporal and spatial distributions and evolutions of the surface rainfall processes,as well as the major radar reflectivity characteristics.The model results can be used in further study on the detailed and quantitative analysis of the surface rainfall processes.