2006年春季河南一次强寒潮天气诊断分析  

Diagnostic Analysis of a Strong Cold Wave Over Henan Province in April 2006

作　　者：郭翠英 闫小利 

机构地区：[1]博爱县气象局,河南博爱454450 [2]焦作市气象局,河南焦作454003

出　　处：《气象与环境科学》2011年第4期40-45,共6页Meteorological and Environmental Sciences

基　　金：河南省气象局科研项目(Z2008022)资助

摘　　要：应用1°×1°NCAR/NCEP再分析格点资料,对2006年4月11—12日发生在河南省的一次强寒潮天气过程进行了热力因子和动力因子的诊断分析,结果发现:这次寒潮天气过程是西路和东路两股冷空气与暖平流共同作用促进蒙古气旋发展,并使低槽、冷锋东移南压造成的;不同的层结条件下垂直速度对河南前期增温、后期剧烈降温有利;非地转湿Q矢量激发的次级环流下沉支的强弱变化及移近、移出与河南省大风天气的强弱发展过程有良好的对应关系;垂直螺旋度大值带的移动和发展对大风落区有较好的指示意义。By using 1 ° × 1 ° NCAR/NCEP reanalysis grid data, a strong cold wave weather was diagnosed by analyzing the heat factor and power factor, which happened in Henan province during April 11- 12, 2006. The results showed that the cold air coming from west load and east load co-act with warm advection to induce the development of Mongolia cyclone, on the other hand, lead low trough and cold front eastward movement and southward push down, which produce the cold wave process. The vertical velocity in different stratification conditions is beneficial to pre-warming and post-cooling sharply in Henan. The strength variety and movement of sinking branch of the secondary circulation stimulated by ageostrophic wet Q vector, has a good relationship with the change of windy weather in Henan. The movement and development of vertical helicity area with great value has a good indication for the gale loading zone.

关 键 词：寒潮 诊断分析 地转湿Q矢量 垂直螺旋度 

分 类 号：P458.122[天文地球—大气科学及气象学]