我国热带气旋暴雨的气候学分析

CLIMATIC ANALYSIS ON THE HEAVY RAINFALL CAUSED BY TROPICAL CYCLONIC STORM IN CHINA

分析了１９８０～１９９０年期间影响我国的热带气旋及其暴雨的频数分布。分析表明，暴雨年频数的地理分布具有明显的纬度地带性和地形性特征。文中还试论了暴雨与热带气旋的登陆位置、路径以及引导层气流等因子的关系。指出低阶流场比热带气旋自身特征有着更加明显的致暴征兆。

A preliminary analysis was done to the tropical cyclonic frequenct (TCF) and rain storm produced by tropical cyclonic (RSTC) in China during 1980 1990. The analysis indicates that there are four tracks after landing of tropical cyclonic: (1) Westward (WW), (2) Northwestward (NW), (3) Northward (WW), patten (LT). Also, the tracks have obvious latitude and geographic features. In addition, the time and space distribution of rain storm frepuency per year (RSFY) was analysed using Correspondence Analysis (CA). The results show, the first eigenvector (R1-eigenvector) presents in two areas, where variance of RSFY is opposite: one area includes Northeast China and Southwest China; the other one includes middle valley of Yelley river and Southeast China. The second eigenvector (R2-eigenvector) presents so that the variance of RSFY related to geography closely. Finally, the RSTC and its relations to troical cyclone landing location, track, circulation patterns at 500 hpa are discussed. The results show that several circulation patterns at 500 hpa over East Asia have more obvious indications of RSTC than tropical cyclone itself.