气象2017，Vol.43Issue(5)：540-551,12.DOI:10.7519/j.issn.1000-0526.2017.05.003
一次强降水过程涡旋状MCS结构特征及成因初步分析
Preliminary Analysis of Structure Characteristics and Causes for Heavy-Rain-Producing Vortex-Shaped MCS
摘要
Abstract
Radar echo characteristics of the vortex-shaped mesoscale convective system (MCS) that produced heavy rain in Jianghan Plain of Hubei Province on 18 June 2011 and the possible causes of MCS structure are analyzed by using Doppler radar data,conventional observations and dense surface observations and the radar 4D-Var wind retrieval data.The results show that:(1) Heavy-rain-producing vortexshaped MCS echoes in mature stage showed multiple spiral convective echo belts with cyclonic curvature,surrounded by stratiform cloud echoes and evolving into the cold and warm frontal structure as a result of invasion of cold air.Echo merger and vorticity train effect are the main characteristics of motion in producing severe precipitation.(2) The vortex-shaped MCS which was in favorable environment was the result of severe development of boundary layer mesoscale vortex system in the transition zone of western Hubei mountain and Jianghan Plain.(3) The formation of the mesoscale vortex system was closely related to the development of the surface reverted warm trough,rainfall in the front of the southwest vortex and special terrain.Strong convergence of airflows from different directions was the main mechanism of the development in its earlier stage.The late development might be related to latent heat release,for the vortex circulation developed upward to 700 hPa.关键词
强降水/涡旋状MCS/结构特征/成因分析/中尺度涡旋系统Key words
severe precipitation/vortex-shaped MCS/structure characteristics/causes analysis/mesoscale vortex system分类
天文与地球科学引用本文复制引用
吴涛,张家国,牛奔..一次强降水过程涡旋状MCS结构特征及成因初步分析[J].气象,2017,43(5):540-551,12.基金项目
中国气象局气象关键技术集成与应用项目(CMAGJ2015M38)、公益性行业(气象)科研专项(GYHY201306008)、湖北省科技发展基金项目(2015Y02)和中国气象局卫星专项(FiDAF-2-01)共同资助 （CMAGJ2015M38）
