郑州地区3次冷涡型强对流天气对比分析  

Contrastive Analysis of Three Severe Convective Weather Processes Under Cold Eddy Synoptic Situation in Zhengzhou

作　　者：梁钰[1,2] 张一平[1,2] 董俊玲[1,2] 齐红[1] 

机构地区：[1]中国气象局.河南省农业气象保障与应用技术重点开放实验室,郑州450003 [2]河南省气象台,郑州450003

出　　处：《气象与环境科学》2014年第3期1-7,共7页Meteorological and Environmental Sciences

基　　金：公益性行业(气象)科研专项"影响黄淮中西部的台风暴雨预报技术"(GYHY201306012);中国气象局预报员专项"河南省两次致灾大风对比分析及预报"(CMAYBY2013-041)资助

摘　　要：对2004年6月中下旬郑州地区3次比较典型的强对流天气的高低空形势、物理量场及雷达资料的对比分析结果表明:1)500 h Pa冷涡的位置在42°N以南,郑州上游有较强冷平流侵入,并且700 h Pa和850 h Pa也有对应低值系统存在,是郑州地区强对流天气发生发展的大尺度环流背景。2)地面中尺度辐合线的存在是强对流天气的主要触发机制。3)动力因子的差异造成了不同类型的强对流天气。4)雷暴云中强下沉冷空气在近地层强烈辐散能够引起地面大风。5)水汽因子的差异决定了雷雨能否发生。上下层均为干冷空气时一般仅伴有大风天气;低层暖湿、中高层干冷时能增加大气的对流性不稳定,有利于强降水和局地冰雹的产生。By contrastive analyzing upper and lower air synoptic situation, physical quantity diagno- sis and radar data of three severe convective weather processes under cold eddy synoptic situation in the middle and late June 2006 in Zhengzhou, the results are as follows. 1 ） 500 hPa cold eddy located in south 42~N, the cold advection reaches the upper of Zhengzhou, corresponding low pressure system exists in 700 hPa and 850 hPa. These are the large scale circulation background for the generation and develop- ment of severe convective weather in Zhengzhou. 2）The existence of surface mesoscale convergence line is the main triggering mechanism. 3） The differences in dynamic factors generate different types of severe convective weather. 4） Remarkable divergence in surface layer produced by downdrafi of cold air in thun- dercloud can cause strong wind. 5） The differences in vapor factors determines whether thunderstorms oc- cur. Generally both in the upper and lower layers are dry and cold air, it only associated with windy weather ; it will be propitious to form heavy rain and local hail when it＇ s warm and wet in lower and cold and dry in upper, which can increase the instability of atmospheric convective.

关 键 词：冷涡 强对流天气 辐合线 

分 类 号：P458.11[天文地球—大气科学及气象学]