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NUMERICAL SIMULATION AND MESOSCALE ANALYSIS OF A TORRENTIAL RAIN CAUSED BY TYPHOON

ZHAO Lei-gang, ZHOU Yi, LI Yun-ying , ZHENG Lun-wei (Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101 China)  
A heavy storm rainfall caused by Typhoon Aere (No.0418) when landing at Fujian has been successfully simulated by using AREM model. The simulation result is scale-separated by spatial band-pass filtering, which reveals the mesoscale low pressure and convergence line that has direct impact on this rainfall process. The physical characteristics of the two mesoscale systems and their relation with rainfall are also analyzed. Study shows that there exists a well corresponding relationship between the storm rainfall and mesoscale divergence and strong updraft arising from the convergence, which is caused by the interactions between the mesoscale systems and topographic features, and is directly responsible for the rainfall.
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