中文摘要：

运用WRF模式对2009年7月华北地区的一次暴雨过程进行数值模拟,结果表明：WRF模式比较合理地再现了这次暴雨天气过程;本次暴雨过程的主要输送载体为西太平洋副热带高压外围及低槽前的西南急流;低层水汽通量散度的负值区与降水落区有较好的相关性;对水汽通量拓展分析研究表明,纬向水汽辐合及由风场辐合效应造成的水汽辐合贡献较大,经向水汽辐合和由于水汽分布不均而形成的平流差异所造成的水汽辐合贡献较小,且多为负贡献;水汽散度的垂直通量负异常区与云水、雨水混合比较大的区域对应得较好,它与降水的相关性也优于水汽通量散度。

英文摘要：

Using the WRF model,a case of rainstorm over North China is numerically simulated.The result shows that the numerical simulation of this rainstorm process is reasonable.Then some physical parameters which associated closely with vapor conditions are calculated based on the simulated results.The result indicates that the southwest jet outside the Western Pacific Subtropical High and in front of low trough is the transport carrier of the moisture for the rainstorm.The negative low-level moist divergence flux has better correlation with the precipitation.As to the moisture flux for the rainstorm,the zonal convergences of the moist and wind fields have a good contribution.Comparatively,the meridional convergence and flow of moist mainly have negative contributions.The negative anomaly area of the vertical flux of moisture divergence is corresponded well with the area of the high-value mixing ratio of cloud water and rain water,and is related much better with precipitation than moisture flux divergence.