江淮梅雨锋暴雨过程中尺度系统的演变及结构特征分析与研究  

The Analysis and Research to the Evolution and Structure Characters of the Mesoscale Systems during the Meiyu Front Heavy Rain Processes

作　　者：李柏[1] 曹性善[1] 周昆[1] 陆大春[1] 

机构地区：[1]安徽省气象局,合肥230061

出　　处：《气候与环境研究》2001年第2期168-173,共6页Climatic and Environmental Research

基　　金：国家自然科学基金资助项目49794030

摘　　要：利用ＨＵＢＥＸ试验期间的ＩＯＰ资料以及合肥多普勒天气雷达的信息以及中尺度数值模式，分析研究了发生在１９９９年６月２０～３０日江淮流域的梅雨锋暴雨过程。研究发现：α中尺度辐合线主要位于 ７００ ｈＰａ以下中低层；当有强降水发生时，辐合线上有明显的β中尺度气旋波动发生。与其相配合，多普勒雷达反射率图上存在一片约 ２０ ｋｍ×２０ ｋｍ且强度在 ４０ ｄＢＺ左右，回波顶高为 ７～８ ｋｍ，液态水垂直累积含量（ Ｖｉｌ）约为 １０ ｋｇ／ ｍ２的回波区，其尺度为γ中尺度。它的出现与锋生次级环流有着十分密切的关系，且由大尺度凝结潜热和对流凝结潜热强迫的次级环流对它的发生发展起着主导作用。HUBEX's data during the IOP, Doppler Radar data and the mesoscale numerical model MM4 are used to simulate and study the Meiyu front heavy rain process occurred in Changjiang-Huaihe valley from June 20 to June 30, 1999. The results show that when the Meiyu front heavy rain process happened, meso-α convergence belt existed below the 700 Pha level. While strong precipitation took place, there are evident cyclone waves of meso-βon the mid and low levels. With corresponding to the meso-β, there was the radar echo region of 20 km x 20 km, which the reflectivity is about 40 dBZ and their echo top, in general, was about 7~ 8 km heights and vertical integrated liquid (i.e. Vil) is more than 10 kg / m2. Their horizontal scale is meso-γ. The development of these mesor-γ systems is closely relative to the frontal secondary circulation and the secondary circulation plays an important role in the development of the meso-γ scale systems, which are forced by the large scale condensation latent heating and the convective condensation heating.

关 键 词：梅雨锋 暴雨 中尺度系统 次级环流 天气过程分析 江淮地区 

分 类 号：P458.121[天文地球—大气科学及气象学]