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《Meteorology and Disaster Reduction Research》 2014-01
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Typhoon “Trami” Track and the Precipitation Diagnostic Analysis During Its Impacting on Jiangxi

Guo Dafeng;Bao Huimeng;Zheng Jinguang;Wu Jing;Jiangxi meteorological station;Fuzhou meteorological station;  
Based on conventionally detected data,NCEP reanalysis data,numerical weather prediction model data and Doppler radar data,the track and precipitation of strong typhoon "Trami"after landfall were diagnostically analyzed on the large scale circulation background,the physical characteristics,and so on. The results are as follows:The typhoon movement was related with the evolvement of subtropical high. The typhoon center moved toward the west-northwest during the first 13 hours after"Trami"landing due to the influence of southeasterly wind on the south side of the subtropical high. The movement direction increasingly transformed toward the west and west-southwest after entering Jiangxi province due to the impact of subtropical high. By analyzing the wind speed near the center of "Trami",it presented apparently asymmetric structure. Along with its moving westward,the maximum wind speed area presented counterclockwise and the easterly wind speed exceeded westerly wind speed which caused it's direction from northwest to west and southwest gradually. The Doppler radar product OHP(one hour precipitation)had well correlation with both R and VIL(vertical integrated liquid water). Also the OHP in Nanchang was consistent with actual precipitation area,although it was about 50% less than the actual rainfall. Storm intensity could be reflected by moisture flux divergence,larger moisture flux divergence means stronger storm. Heavy rainfall was closely related to the transportation of southwestern moisture transportation. The upward motion in most part of central Jiangxi province offered dynamic mechanism to heavy rainfall,lower-level convergence and upper-level divergence were important factors for heavy rainfall occurrence.
【Fund】: 国家科技部“十二五”科技支撑项目(编号:2012BAK09B04)
【CateGory Index】: P458
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