东北冷涡外围辽西沿海强对流天气特征分析  

Characteristics of Severe Convective Weather in the Western Coastal Area of the Northeast Cold Vortex

作　　者：胡明 高莉莉 高铭 徐玉秀 蒋姗姗 杨桂娟 Hu Ming(Meteorological BureauofJinzhou City,Jinzhou 121001,China)

机构地区：[1]锦州市气象局,辽宁锦州121001

出　　处：《安徽农学通报》2018年第18期115-118,共4页Anhui Agricultural Science Bulletin

摘　　要：利用常规观测资料、自动站加密观测资料和雷达资料,对2017年7月9日辽宁省西部到中部地区1次短时强对流的天气形势、物理量场、雷达回波特征进行分析。结果表明:在有利降水的大尺度天气系统背景下,底层冷空气和低空急流以及中尺度天气系统造成了本次强对流天气。底层925~850hPa的充沛水汽和辐合上升运动强对流天气的发生,地面复合线和低压环流造成本次短时强降水天气。雷达组合反射率因子>45dbz的强回波区与强降水落区基本吻合,并对应地面中尺度气旋式环流的形成和维持。By using conventional observation data, the automatic station observation data and radar data, physical quantity field and radar echo characteristics of a short-term strong convective weather situation were analyzed from the west area to the central area in Liaoning province on July 9,2017. Favorable conclusions showed that the precipitation of large scale weather system background, the cold air and low level jet and the mesoscale weather system caused the strong convection weather. The abundant water vapor and convergence upward movement between 925hPaand 850hPawere beneficial to the occurrence of strong convective weather. The short-time strong rainfall weather were caused by composite ground wire and low pressure circulation. The strong echo region with radar combi- nation reflectance factor 〉 45dbz coincides basically with the heavy rainfall area, and corresponds to the formation and maintenance of mesoscale cyclonic circulation on the ground.

关 键 词：短时强降水 中气旋 冰雹 中尺度天气系统 暴雨 

分 类 号：P458.121[天文地球—大气科学及气象学]