中文摘要：

针对2008年6月广东地区的一次强降雨过程,利用WRF中尺度数值模式及其三维变分同化系统（WRF-3DVAR）,进行了多普勒雷达径向速度变分同化对暴雨过程模拟效果影响研究。结果表明：WRF-3DVAR能够有效地同化多普勒雷达径向速度,同化后的主要影响在于改进了初始动力场,使得初始场包含有更详尽的中尺度特征信息,进而显著提高模式对广东局地暴雨过程的模拟效果。在高分辨率中尺度数值模式中有效地利用多普勒天气雷达资料,是提高中尺度降雨预报的关键。

英文摘要：

In order to study the influence of Doppler radar radial velocity assimilation on the numerical simulation of heavy rainfall,the roles played by WRF and WRF-3DVAR in improving the initial fields and simulation results are analyzed.A investigation is conducted on a heavy rainfall event occurred in Guangdong Province on 6 June 2008,and the results indicate that radial velocity,which can be assimilated effectively by WRF-3DVAR,affected the initial dynamical field. By adjusting horizontal wind and vertical velocity around the radar station,the mesoscale characteristics of the initial wind field are improved.Moreover,for rainfall simulation,the radial velocity assimilation experiment is better than those without assimilation.