海风锋导致雷暴生成和加强规律研究  

Study of Thunderstorm Initiation and Intensification Rules Associated with Sea Breeze Fronts

作　　者：卢焕珍[1] 刘一玮[1] 刘爱霞[2] 张楠[1] 孙密娜[1] 

机构地区：[1]天津市气象台,天津300074 [2]天津市气象科学研究所,天津300074

出　　处：《气象》2012年第9期1078-1086,共9页Meteorological Monthly

基　　金：公益性行业(气象)科研专项(GYHY200706042和GYHY20100605);预报员专项(CMAYBY2012-003);国家科技支撑计划重点项目<城市群高影响天气预报系统的集成和业务示范>(2008BAC37B05和2008BAC37B01);天津市气象局科研课题(201101和201102)共同资助

摘　　要：应用雷达和地面自动气象站资料结合订正的天津探空资料,分三种类型统计分析了2004—2009年雷达监测到的50次由渤海湾海风锋导致雷暴生成和加强的规律及对应的天气背景;应用VDRAS系统资料分析了第三种类型(在不稳定环境下,沿海风锋直接触发雷暴)的热力、动力结构特征。结果表明:(1)强对流不稳定环境下,沿海风锋可以直接触发雷暴并沿海风锋移动的同时发展加强;(2)不同的类型在雷暴生成的位置、发展加强的速度、强度等方面都有明显的不同;(3)Ⅰ型对应背景场的动力条件更为有利,强对流天气更为剧烈,Ⅲ型对应背景场的热力、动力条件和水汽条件更为有利,对流抑制指数(CIN)小;(4)海风锋使得低层形成中尺度辐合线,沿海风锋垂直上升速度从地面一直延伸至3 km高度,强中心出现在1.5～3.0 km高度,最大风速达1.9 m·s^(-1)。Using the radar and automatic weather station （AWS） data, and the Tianjin corrected sounding data, the rules and synoptic-scale meteorological conditions for three types of thunderstorms initiation and intensification associated with sea-breeze fronts in the Bohai Bay from 2004 to 2009 are investigated. Based on VDRAS （variational Doppler radar analysis system） data, the thermal and dynamical structures of the third type thunderstorm were analyzed. The results show that. （1） Under the strong instable environ- ment, thunderstorm is initiated and intensified when it moves along the sea-breeze fronts. （2） The loca- tion, the rate of intensification, and the intensity are distinct for different types. （3） For type I, the dy- namical is better than the other two types, and convection weather is stronger. For type [U, the thermal, dynamical and vapour are better than the other two types, while CIN （convection inhibition） is small. （4） A mesoscale convergence line is formed at low-level by sea-breeze front. Vertical updrafts along the sea- breeze front extend from the ground to the height of 3 km. Strong centers appear at the height of 1.5-- 3.0 kin, and the maximum velocity is up to 1.9 m s-1.

关 键 词：海风锋 雷暴 出流边界 VDRAS系统资料 

分 类 号：P425.41[天文地球—大气科学及气象学]