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

Progress in Natural Science:Materials International 2009年第1期19卷 55-63页

作者： Caijun Yue a,b,a Shanghai Typhoon Institute,the china Meterological Administration Shanghai 200030,China b Laboratory of Typhoon Forecast Technique/China Meterological Administration,Shangai 200030,China Shanghai Typhoon Institute the china Meterological Administration Shanghai 200030 China Laboratory of Typhoon Forecast Technique/China Meterological Administration Shangai 200030 China

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 *** major factors determining the ascending motion associated with torrential rainfall have been studied:large-scale and convective condensational heating,topographic lifting and *** 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 *** topographic lifting affects the formation of rainfall,whereas the topographic friction has important impacts on torrential rainfall after 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 *** 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 *** 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： Torrential rainfall Typhoon landfall Modi?ed moist ageostrophic Q vector Topography condensational heating Quantitative analysis

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