初夏两次东北冷涡背景下强对流天气对比分析
投稿时间: 2014-07-03  最后修改时间: 2014-07-03  点此下载全文
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作者单位E-mail
陈长胜 吉林省气象台 chencs_iap@163.com 
基金项目:公益性行业专项(GYHY201006006)、中国气象局预报员专项(CMATG2010Y05)和吉林省气象局重点课题(201201)
中文摘要:以2009年初夏的两次冷涡天气过程为对象,应用吉林省气象观测站实时观测资料和NCEP/NCAR提供6小时1鹤1?再分析资料进行了对比分析。在分析冷涡活动路径及强对流天气与高低空环流配置关系基础上,进一步选取两次冷涡过程中两场有代表性的对流天气从热力、动力、不稳定条件等多方面进行对比分析。结果发现:(1)东北冷涡发展演变与高层温度平流有关,涡后冷平流越强,冷涡发展越快;在冷涡发展至成熟阶段,高空锋区与强对流天气发生的区域有很好的对应关系;在冷涡逐渐的消散阶段,暖平流侵入冷涡内部的交汇处也是强对流天气发生的区域。(2)强的环境风垂直切变环境下,高低层急流的耦合作用触发强烈垂直运动。在没有高低空急流耦合作用的弱风垂直切变的环境场中垂直运动也相对较弱。(3)对流不稳定和条件性对称不稳定都可以激发东北冷涡背景下的强对流天气。
中文关键词:冷涡  强对流天气  垂直风切变  高低空急流耦合  条件性对称不稳定
 
Analyses of Two Strong Convective Weather Process Based on Northeast Cold Vortex in Early Summer
Abstract:Two weather processes in the 2009 early summer are analyzed based on real-time observation data of Jilin Province meteorological observation station and 6-hours of 1鹤1?NCEP / NCAR reanalysis data. On the basis of the analysis of cold vortex activity tracks and the relationships between strong convective weather and high-low circulation, two representative convective weathers selected from two cold vortex processes respectively are studied with the thermodynamic, dynamic and unstable conditions. The results show that: (1) The northeast cold vortex evolution and high temperature advection, stronger is the cold advection after the vortex, faster cold vortex develops; from development to mature stage of cold vortex, high front zones and strong convective weather region is corresponding; while in cold vortex gradually dissipated stage, the strong convection weather occurring at the region where warm advection invades in cold vortex. (2) In the environment with strong environmental wind vertical shear, high and low level jet coupling trigger strong vertical motion. In the absence of jet stream coupling and weak vertical wind shear environment, vertical motion is relatively weak. (3) The convective instability and conditional symmetric instability might stimulate the strong convective weather at the background with the northeast cold vortex
keywords:cold vortex  strong convection weather  vertical wind shear  jet stream coupling  conditional symmetric instability
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