SIMULATION STUDY ON CAUSES OF TROPICAL STORM FITOW (0114) HEAVY RAIN  

作　　者：李江南 闫敬华 蒙伟光 陈训来 侯尔滨 王安宇 

机构地区：[1]Department of Atmospheric Sciences/Research Center of Monsoon and Environment, Sun Yat-sen University, Guangzhou 510275 China [2]Guangzhou Institute of Tropical and Marine Meteorology, CMA, Guangzhou 510080 China [3]Macao Geophysical and Meteorological Bureau, Macao

出　　处：《Journal of Tropical Meteorology》2005年第1期42-50,共9页热带气象学报（英文版）

基　　金：The National Natural Science Foundation of China (No. 40375036); the Base Condition Flat Roof Item of the Ministry of Science and Technology (No.2003DIB4J145)

摘　　要：With PSU/NCAR nonhydrostatic mesoscale model MM5, the rainfall process of tropical storm Fitow(0114) is simulated for 00:00 UTC 31 Aug. – 00:00 UTC 2 Sept. 2001. Mesoscale separation is performed on the results with the filtering scheme. Analyses show that the MM5 model well reproduced the position and intensity of heavy rain. Mesoscale characteristics of heavy rain were well represented in rainfall time scale, rainfall area, stream field and divergence at lower and upper levels. The interaction between inverted typhoon troughs and the mesoscale systems lead to heavy rain occurrence. The distribution of divergence fields at lower and upper levels can have a kind of indication for the rainfall. Heavy rains are closely associated with topography and land-sea distribution in South China. Weak instability is favorable to the generation of heavy rain.With PSU/NCAR nonhydrostatic mesoscale model MM5, the rainfall process of tropical storm Fitow(0114) is simulated for 00:00 UTC 31 Aug. – 00:00 UTC 2 Sept. 2001. Mesoscale separation is performed on the results with the filtering scheme. Analyses show that the MM5 model well reproduced the position and intensity of heavy rain. Mesoscale characteristics of heavy rain were well represented in rainfall time scale, rainfall area, stream field and divergence at lower and upper levels. The interaction between inverted typhoon troughs and the mesoscale systems lead to heavy rain occurrence. The distribution of divergence fields at lower and upper levels can have a kind of indication for the rainfall. Heavy rains are closely associated with topography and land-sea distribution in South China. Weak instability is favorable to the generation of heavy rain.

关 键 词：tropical cyclones heavy rain mesoscale characteristics 

分 类 号：P444[天文地球—大气科学及气象学] P458.124