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Quantitative analysis of torrential rainfall associated with typhoon landfall:A case study of typhoon Haitang(2005)

查看全文 作　　者：Caijun [1,2]Yue 高影响力作者 机构地区：[1]Shanghai Typhoon Institute, the china Meterological Administration Shanghai 200030, China;[2]Laboratory of Typhoon Forecast Techniquel China Meterological Administration, Shangai 200030, China高影响力机构 出　　处：《Progress in Natural Science:Materials International》索引2009年第19卷第1期,共9页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (Grant Nos.40875025,40405009,40075009,and 40205008);Jiangsu Key Laboratory of Meteorological Disaster Funding of China (GrantNo.KJS0602);Shanghai Natural Science Foundation of China (08ZR1422900) 摘　　要：A quantitative analysis of torrential rainfall associated with typhoon Haitang(2005) is carried out using a modified moist ageostrophic Q vector and data from Weather Research and Forecasting(WRF) model simulation.Four major factors determining the ascending motion associated with torrential rainfall have been studied:large-scale and convective condensational heating,topographic lifting and friction.The results show that the convective condensational heating plays a major role in the torrential rainfall process,and the large-scale condensational heating is secondary before the landfall of typhoon Haitang,and vice versa after the landfall.The topographic lifting affects the formation of rainfall,whereas the topographic friction has important impacts on torrential rainfall after the landfall.The rainfall amounts forced by the topographic friction and lifting have similar horizontal distributions,but the magnitudes of the former are 2-3 times larger than those of the latter.The rainfall amounts forced by topography(lifting and friction) and modified moist ageostrophic Q vector have different horizontal distributions,and the magnitudes of the former are 2-5 times larger than those of the latter.Synthetic analysis shows that the typhoon rainfall may be motivated by modified moist ageostrophic Q vector and enhanced further by the topographic effects. 关 键 词：台风 着陆 地形学 降雨量
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