登陆广东热带气旋中尺度降水分布变化特征

利用每小时地面观测资料和卫星遥感资料 ,以 1 999～ 2 0 0 1年在珠江三角洲地区登陆的热带气旋为研究对象 ,从合成分析和个例分析两方面揭示了登陆广东热带气旋降水的中尺度特征及其分布变化。结果表明 ,热带气旋登陆前后中尺度强降水分布发生明显变化 ,登陆后降水不对称性加大 ;热带气旋登陆后中尺度强降水分布随时间变化 ,登陆后第 1 0个小时之前 ,中尺度强降水基本上分布于热带气旋中心附近 ;而热带气旋登陆第 1 0个小时之后 ,中尺度强降水具有明显的“离心”或“偏心”特征。

Distribution and Variation Characteristics of Mesoscale Precipitation of Tropical Cyclones

Distribution and variation characteristics of mesoscale precipitation of tropical cyclones landed in Guangdong are studied with the data of hourly precipitation from satellite and surface observation. The results indicate that the distinct variation of mesoscale precipitation distribution between before and after tropical cyclones landfall occurs. Mesoscale precipitation distribution became more asymmetrical after tropical cyclones landfall varies with time. The mesoscale precipitation distributes quasi-symmetrically near the center of tropical cyclones in 10 hours after landfall. But it happens after 10 hours that mesoscale precipitation distributes asymmetrically near the center of tropical cyclones or far away center of tropical cyclones.