新乡一次强对流天气过程的诊断分析  

Diagnostic Analysis of a Strong Convection Process of Xinxiang

作　　者：孟祥翼 王飞 张金平 马卫华 

机构地区：[1]新乡市气象局,河南新乡453003

出　　处：《气象与环境科学》2011年第B09期10-15,共6页Meteorological and Environmental Sciences

摘　　要：利用常规气象资料、多普勒雷达资料及NCEP再分析资料,对2009年9月5日发生在新乡西北部山区的局地强对流暴雨过程进行了物理量演变和中尺度分析。结果表明:高空不稳定小槽、中低空切变线和西南急流以及地面弱冷空气的南下扩散是此次强对流过程主要影响系统。高空低槽和中低空切变线为其提供了有利的辐合上升环境场,低空西南急流为其提供了充分的水汽条件和不稳定能量,而地面弱冷空气的扩散南下又为其提供了触发抬升条件。By using conventional observation,Doppler radar and NCEP reanalysis data to perform the changes of physical features and mesoscale analysis of the strong convection process in the northwest Xinxiang area on 5 September 2009.The result indicate that unstable upper trough,shear line and southwest jet in low level and southward moving cold air is the main influencing system of this strong convection process.Upper trough and low-level shear provides favorable convergence ascending environmental field,sufficient vapour condition and unstable energy provided by southwest jet,on the other hand,southward moving cold air provides lifting condition.

关 键 词：强对流 暴雨 中尺度 气旋波 垂直螺旋度 雷达回波 

分 类 号：P458.3[天文地球—大气科学及气象学]