2016年“7•19”晋城市暴雨成因分析

Analysis on the Causes of Torrential Rainfall Event in Jincheng on 19 July 2016

摘要: 利用常规观测资料、地面逐小时降水、逐小时风场及多普勒雷达资料，对2016年7月19日发生在山西南部晋城市的区域暴雨过程进行了分析，结果表明：“7•19”晋城区域暴雨主要出现在西风槽东移、副高缓慢西进的过程中，低涡切变与晋城市暴雨密切相关。对流层低层和地面冷空气的入侵是产生这次对流天气的主要触发机制。西南低空急流为暴雨区提供了充沛的水汽。中尺度辐合线与短时强降水有很好的对应关系。暴雨过程存在 “列车效应”，强回波维持时间较长是晋城市出现强降水的重要原因。晋城市地形对大暴雨有明显贡献，大暴雨区出现在太行山迎风坡。

Abstract: Using conventional observation data, hourly rainfall and hourly wind data on ground, and Doppler radar data, we analyzed the torrential rainfall event occurred in Jincheng of southern Shanxi province on 19 July, 2016. The results indicate that the torrential rainfall mainly occurred when westerly trough moved to east and subtropical high moved to west slowly, and low vortex shear was closely related to the heavy rainfall. The invasion of the cold airs on ground and the lower troposphere were main triggering mechanism of the convection weather. Southwest low level jet provided abundant water vapor for torrential rainfall area. The mesoscale convergence line corresponded well with short-time strong rainfall. “Train effect” occurred in torrential rainfall process. Strong echo maintaining for a long time was the important reason for the strong precipitation. Terrain of Jincheng played the important role at the torrential rain event, and torrential rain area appeared in the windward side of Taihang Mountain.