一次强对流天气过程中尺度对流系统特征分析

利用NCEP／NCAR再分析资料、FY2C云图及广州新一代多普勒天气雷达产品，对2007年6月9～10日发生在广东省的一次强对流天气过程中的中尺度对流系统（MCS）进行了分析，主要结论有：1）对流层中高层辐散低层辐合，以及“上千下湿”相配置的垂直环流结构特征，和不稳定的大气层结为此次暴雨的形成提供了所需的动力条件和水汽条件；2）MCS云系生成、发展于南支槽和西南低涡东南侧的暖湿气流所形成的云系中；3）在雷达回波图上，MβCS回波的发展具有明显的右移风暴移动特点和“列车效应”，且发展成熟阶段的回波呈显著的“弓形”和“人字形”水平回波演变结构。

Analysis on the MCS Characteristics of a Convective Weather Event

NCEP/NCAR reanalysis data,FY-2C satellite images and the CINRAD-SA new generation weather radar data were employed to investigate the MCS(meso-scale convective system) Characteristics of the Convective Weather Event during 9-10th,June 2007.Results show that 1) the vertical structure of upper-level-divergence and lower-level-convergence,the pattern of upper-dry-layer and lower-moist-layer,and the unstable atmospheric stratification,provided the favorable dynamic and moist conditions for the heavy rain;2)MCS initialized and developed at cloud systems of the southern branch trough and the moist airstream located at the southeast flank of southwest vortex;3) the development of the β scale MCS echo has clear characteristics of right-moving storm and train effect,and the evolving horizontal structure of the radar echo shows remarkable bow or herring-bone shape at the mature stage.