一次特大暴雨过程的中尺度低压特征及发展因子分析  

Features and Development Factors of Two Types of Meso-scale Low in an Excessive Heavy Rain Event

作　　者：曹芳[1] 李昀英[2,3] 

机构地区：[1]中国人民解放军95871部队 [2]解放军理工大学气象学院 [3]中国气象科学研究院灾害天气国家重点实验室

出　　处：《暴雨灾害》2011年第1期28-35,共8页Torrential Rain and Disasters

基　　金：国家重点基础研究专项(2010CB951904);国家自然科学基金(41075034);财政部/科技部公益类行业专项(GYHY200906010);中国气象科学研究院灾害天气国家重点实验室开放课题(2009LASM-A04)

摘　　要：以2008年6月12日广西特大暴雨为例,使用2008年华南野外暴雨试验获取的地面降水资料和LAPS 0.045°×0.045°再分析资料,采用带通滤波方法提取暴雨过程中的中尺度系统,对中尺度低压进行分类:第一类中尺度低压先于降水产生,第二类则后于降水产生。各选取1例,分别分析两类中尺度低压发展演变及其垂直结构,根据大、中尺度相互作用诊断方程,诊断两类中尺度低压发展的主要因子。结果表明,第一类中尺度低压在降水过程中由冷性变为暖性,其发展能量主要来源于大尺度环境;第二类中尺度低压自始至终都是暖性的,其发展过程中中尺度扰动能量本身起重要作用。Taking an excessive heavy rain event which occurred in Guangxi on 12 June 2008 for example,based on the surface precipitation data and the LAPS 0.045°×0.045°data collected in the SCHeREX,the meso-scale disturbances in the event were separated by using Barnes band-pass filter,and the meso-scale low were classified into two types.One generated earlier than the precipitation,the other generated later.Then the dynamics and thermodynamics structures of the two types of meso-scale low were analyzed,and development factors were diagnosed according to the large scale and meso-scale interaction diagnosis equation.The results show that there are different characteristics between the two types of low.The first type which occurred earlier than the precipitation is inclined to change from cold core to warm one during its rainfall,while the second type which occurred later than the precipitation keeps warm during the whole period.Further more,the first type developed depending basically on the large scale and meso-scale interaction,while the second type developed mainly due to meso-scale disturbances.

关 键 词：中尺度低压 雨团 垂直结构 发展因子 

分 类 号：P458.121.1[天文地球—大气科学及气象学]