2011年5月9日豫西山区短时大暴雨分析  

Analysis of a Short-time Severe Rainstorm on May 9,2011 in Western Mountainous Area of Henan

作　　者：杜晓民 效文娟 

机构地区：[1]卢氏县气象局,河南卢氏472200 [2]三门峡市气象局,河南三门峡472000

出　　处：《气象与环境科学》2012年第4期52-56,共5页Meteorological and Environmental Sciences

基　　金：中国气象局关键技术与集成项目(CMAGJ2012m31);河南省科技厅重要科研攻关项目(112102310033)资助

摘　　要：利用常规观测资料、NCEP资料、多普勒雷达风廓线产品、雷达单测风资料以及FY-2C红外云图,综合分析了2011年5月9日豫西山区的一次短时大暴雨过程,结果表明:500 hPa河套地区的西风槽、对流层中低层的低涡切变线、地面冷锋是天气尺度的主要影响系统。入侵冷空气与对流层低层暖湿气流的交汇,为暴雨的发生提供了有利的不稳定条件和触发机制。高空风资料中,600 hPa以下西南风或偏南风场的建立,对强降水的出现有警示作用;而600 hPa风速突增到10 m/s以上,可以作为暴雨出现的信号。云顶亮温tbb迅速下降可作为豫西山区强降水出现的指标。The rainstorm process on May 9, 2011 in western mountainous area of Henan was com- prehensively analyzed by using conventional observational data, NCEP data, wind profile products and single-measured data of Doppler radar and FY - 2C infrared cloud images. The results show that the west-erly trough at 500 hPa Hetao area, low vortex shear line in middle and lower troposphere and ground cold front are the main influencing system of the synoptic scale. The intersection of the intruded cold air and the warm and wet airflow in low troposphere has provided favorable instable conditions and trigger mecha-nism for the rainstorm occurrence. In the upper wind data, the establishment of southwester or southerly wind field at 600 hPa has caution effect for strong precipitation appearance. The 600 hPa wind speed is abrupt above 10 m/s, which can be used as a signal for storm appearance. The sharp decrease of tbb can be used as index of strong precipitation appearance in western mountainous area of Henan.

关 键 词：豫西大暴雨 水汽通量散度 雷达产品 高空风 

分 类 号：P458.121.1[天文地球—大气科学及气象学]