摘要
利用常规资料，对2011年7月14～19日连续性强降水过程进行分析，结果表明：这次过程中，西南季风活跃，南海北部西南急流加强，使副热带辐合带加强北抬，稳定维持在福建境内，受副热带辐合带上的波动和低层低涡切变和低空急流影响，造成持续性暴雨天气；大气层结持续不稳定、良好的水汽输送条件和维持较好的垂直上升运动条件，为强对流、暴雨的发生发展提供了必要的能量、水汽和动力抬生条件；垂直速度水平分布与雨区分布的叠加分析，表明强降水区出现在垂直速度等值线密集区（或垂直上升运动区与下沉区的过度地带），而不是出现在最强上升中心区。
A long-lasting heavy rainfall during July 14-19th 2011 is diagnosed by using the conventional observational datasets. The results indicate that during the process, southwest monsoon was active and low-level jet （LLJ） which came from the north of South China Sea strengthened, which enhanced the subtropical convergence strengthening and propagating northward then settling stably in the territory of Fujian. The fluctuation of subtropical convergence, low vortex shear and low level jet, resulted in the persistent rainstorm. The continuous instability of atmospheric stratification and vigorous water vapor transport and vertical ascending movement, all contributed to the continuous rainstorm. The superposition analysis of vertical velocity and rainfall distribution shows that strong precipitation appeared in the dense area （or the transition area of ascending and descending） of vertical velocity while not in the strongest ascending center.
关键词
连续性强降水
辐合带
低空急流
垂直速度
continuous heavy rain
convergence zone
low-level jet
vertical velocity
