河南省两次春季暴雨过程的对比  

Comparative analysis of two spring heavy rainfall events in Henan

作　　者：胡燕平 梁钰 程锦霞 单铁良 惠付梅 

机构地区：[1]河南省漯河市气象局,河南漯河462300 [2]河南省气象台,郑州450003

出　　处：《气象科学》2011年第5期646-651,共6页Journal of the Meteorological Sciences

基　　金：河南省气象局科研项目(Z201102)

摘　　要：利用常规观测资料和NCEP1°×1°再分析资料对2008和2009年春季河南出现的两次区域暴雨过程进行了诊断对比分析。结果表明:500 hPa低槽、中低空切变、地面气旋是这两次过程共同的影响系统。Q矢量辐合和上升运动为两次春季暴雨的发生提供了有利的动力条件。两次过程的水汽均集中在800 hPa以下,主要是低层和边界层的水汽辐合,强的水汽输送和水汽辐合对暴雨的产生有非常重要的贡献。两次过程的大气层结均表现为对流稳定,这点与夏季暴雨有明显的区别。Using the conventional and NCEP（1°×1°） reanalysis data,the causes of two spring heavy rainfall events occurred in 2008 and 2009 are diagnosed and analyzed.The results show that two heavy rainfall events are all caused by the trough at 500 hPa,the lower-level shear and the surface cyclone.The ageostrophic wet Q vector and vertical motion have provided favourable condition for the occurrence of two spring heavy rainfalls.The water vapor condition analysis showed that the vapors concentrate under the 800 hPa layer.The maximum of moisture flux convergence which has contributed greatly to heavy rainfall located in the lower-layer and boundary layer at lower-level.The atmospheric stratification of two spring heavy rainfalls was convective stability,which was different from the heavy rainfall in summer.

关 键 词：暴雨 Q矢量散度 水汽通量散度 

分 类 号：P458.121.1[天文地球—大气科学及气象学]