江苏一次锢囚状MCS和相关中涡旋MCV的观测分析  

Analysis of an Occluded-Shape Mesoscale Convective System(MCS)and Concomitant Mesoscale Convective Vortex(MCV) in Jiangsu

作　　者：陈永林[1] 俞小鼎[2] 杨引明[1,3] 王慧[1] 刘红亚[1] 

机构地区：[1]上海中心气象台,上海200030 [2]中国气象局气象干部培训学院,北京100081 [3]上海市气象局,上海200030

出　　处：《气象》2016年第2期166-173,共8页Meteorological Monthly

基　　金：公益性行业(气象)科研专项(GYHY201306010);国家自然科学基金项目(41475040)共同资助

摘　　要：利用常规地面和高空气象观测资料,结合气象卫星云图和雷达回波,分析了2009年6月14日15—23时（北京时,下同）,造成江苏强对流天气的一个中尺度对流系统（MCS）的锢囚状特征的形成过程及其垂直结构。地面中尺度分析表明,雷暴高压东侧在飑前倒槽北端发展的闭合低压环流的东南气流将暖湿空气输送到冷性雷暴高压的北侧形成东南一西北向的暖舌,从而形成锢囚状的结构。长三角探空网资料的垂直结构分析表明,在对流层下部地面到850 hPa为冷性的雷暴高压,在对流层中部700 hPa为冷性的α中尺度涡旋（MCV）,而500 hPa已转变为暖性的MCV。静力学关系可以说明MCV仅仅存在于700~500 hPa的原因和MCS下冷上暖的热力结构密切相关。Using conventional surface and upper air observation data, meteorological satellite cloud images and radar data, we analyzed the occluded characteristics and vertical structure of a mesoscale convective system （MCS） that happened in Jiangsu Province on 14 June 2009. By analyzing the mesoscale circulation on the ground surface we found that the southeast flow of closed cyclonic circulation, which developed in the eastern side of thunderstorm high pressure and the northern end of inverted trough, transported the warm and moist air to the northern side of cold thunderstorm high, froming a SE--NW oriented warm tongue and then the occluded structure. Meanwhile, based on the vertical structure of sounding data in Yangtze River Delta, the paper showed that there was cold thunderstorm high between the surface and 850 hPa, and warm meso-α scale convective vortex from 700 hPa to 500 hPa. From the statics relationship, we learned that the reason why the mesoscale convective vortex （MCV） only existed in the height of 700 hPa to 500 hPa is closely related to the thermal structure of mesoscale convective system （MCS） which was warm in the upper level but cold in the low level.

关 键 词：强对流 锢囚状 中尺度对流系统 中尺度涡旋 

分 类 号：P458[天文地球—大气科学及气象学]