一次秋季暴雨天气成因分析  

Analysis of Synoptic Cause of a Heavy Rainfall Event in Autumn

作　　者：范俊红 郭树军 王世彬 李芸[3] 

机构地区：[1]河北省气象局,石家庄050021 [2]黄骅港水文气象站 [3]山东省气象局

出　　处：《气象》2005年第9期62-65,F0003,共5页Meteorological Monthly

摘　　要：利用常规气象资料、山东济南WSR-98D雷达资料等,分析了2003年10月9～12日的高空环流形势、地面气压场,物理量场、单站降雨量随时间的演变、组合反射率与基本速度图等.结果表明:(1)稳定的500hPa环流形势是造成暴雨的必要前提;(2)暴雨区内的水汽供应主要是边界层内的水汽通量辐合造成的;(3)地面中尺度气旋的徘徊打转使气旋北部长时间维持强烈辐合运动,与高层辐散形成的'抽吸作用',造成暴雨区强烈的上升运动;(4)沧州站每小时降水量的两个峰值分别与两支低空急流的交汇、地面中尺度气旋强烈发展时刻相对应.Based on the conventional meteorological data and WSR-98D radar data of Jinan, Shandong province, the upper air circulation, physics diagnostic field, the evolution of hourly precipitation with time, the base velocity and composite reflectivity, and so on are analyzed. The conclusions are as follows： （1） The stable upper air circulation at 500 hPa is the essential factor. （2） The convergence of vapor flux in the boundary layer is the source of water vapor. （3） The strong ascending motion is caused by “pumping” which is formed by strong convergence occurs in the north of the meso-scale cyclone and upper air divergence at high levels, （4） The meeting of two low-level iets makes the first hourly precipitation peak and the development intensively of meso-scale cyclone which makes the other hourly precipitation peak of Cangzhou station.

关 键 词：一次秋季暴雨天气 高空环流形势 地面气压场 物理量场 单站降雨量 水汽条件 

分 类 号：P458.121.1[天文地球—大气科学及气象学]