一次豫北春季强对流暴雨过程的螺旋度分析  

Helicity Analysis of Strong Convective Storm Process in Spring of Northern Henan

作　　者：牛广山 李俊杰 李秋元 王大勇[2] 

机构地区：[1]焦作市气象局,河南焦作454003 [2]山西省气象局,太原030002

出　　处：《气象与环境科学》2010年第1期40-47,共8页Meteorological and Environmental Sciences

摘　　要：利用中尺度有限区域WRF模式输出的细网格资料和多普勒雷达观测资料,根据螺旋度理论,结合稳定度条件以及水汽和能量等物理量,对2009年3月20日夜至21日凌晨发生在豫北的一次强对流及暴雨过程的局地螺旋度演变进行诊断分析。结果表明,这次春季强对流和暴雨与西南急流和高温高湿不稳定能量密切相关,正螺旋度大值中心出现的高度与对流发展的强弱有关;500 hPa螺旋度正值区中心与强对流降水区域对应;暴雨易产生在850 hPa螺旋度中心附近,螺旋度的强度变化对强对流系统的移动、发展及暴雨的发生有一定的指示意义。Using the output fine mesh material and Doppler radar observations of the meso - scale limited regional WRF mode, according to the helicity theory with the stability conditions and vapor and energy physical fields, the paper analyzes local area helieity evolution of strong convective and rainstorm process happened from March 2009 20 night to 21 midnight. Results show that the spring strong convective and rainstorm and southwest jet and high temperature and high humidity unstable energy are closely related. The height of positive helicity high value center is related with the intensity of convective development. The paths are consistent of helicity positive value center in 500 hPa and strong convective precipitation region. Storms often occurred near the center of helicity in 850 hPa; the intensity change of helicity has some indication to the movement, development of strong convective system and the occurrence of rainstorm.

关 键 词：WRF模式 局地螺旋度 强对流 暴雨 

分 类 号：P458.121.1[天文地球—大气科学及气象学]