IMPACTS OF TWO TROPICAL CYCLONES EXPERIENCING EXTRATROPICAL TRANSITION DURING NORTHWARD PROGRESSION ON THE RAINFALL OF L

Both of Typhoon Winnie (971 1) and Matsa (0509) underwent an extratropical transition (ET)process when they moved northward after landfall and affected l.iaodong Peninsula. However,Matsa produced half as much rainfall as Winnie,although it struck I.iaodong Peninsula directly while Winnie passed through the Bohai Sea. The relations between the ET processes and the precipitation over Liaodong Peninsula are examined. The result shows that the precipitation difference between Winnie and Matsa was closely related to the interactions between the westerly systems and typhoons during their ET processes.Winnie was captured by the upper westerly trough and then coupled with it when moving to the mid-latitudes,and the positive anomaly of moist potential vorticity (MPV) was transported downward from the upper troposphere over the remnant circulation of the tropical cyclone (TC). It was favorable to the interaction between tropical warm and wet air and westerly cold air,causing convective cloud clusters to form and develop. The rain belt composed of several meso-/3 cloud clusters over the Liaodong Peninsula,resulting in heavy rainfall. On the other hand. Matsa did not couple with any upper trough during its ET process and the positive anomaly of MPV in the upper troposphere and its downward transfer were weak.Only one meso-/3 cloud cluster occurred in Matsa's rain belt during its ET process that tended to lessen rainfall over Liaodong Peninsula.

作 者： LIANG Jun CHEN Lian-shou LI Ying ZHU Jing   作者單位： LIANG Jun,ZHU Jing(Dalian Meteorological Observatory,Dalian 116001 China)

CHEN Lian-shou,LI Ying(Chinese Academy of Meteorological Sciences/LaSW,Beijing 100081 China) 

刊 名： 熱帶氣象學報(英文版)  英文刊名： JOURNAL OF TROPICAL METEOROLOGY  年，卷(期)： 2009 15(1)  分類號： P444  關鍵詞： synoptics   typhoon rainstorm   diagnostic analysis   extratropical transition   tropical cyclone   Liaodong Peninsula  

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