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《Journal of Mountain Science》 2008-04
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Ageostrophic Wet Q-Vector Analysis and Its Application to a Heavy Rainstorm in North Sichuan Basin

LIU Yuncheng1,WANG Chenghai2,LONG Xiao2(1.Guangyuan Meteorology Bureau,Guangyuan 628017,China;2.College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China)  
Using the routine observation data,the circulation feature of a regional heavy rain process in North Sichuan Basin on 18~19 July 2005 was analyzed.A dynamic diagnosis was made by using the ageostrophic wet Q-vector theory.The results showed as follows.This heavy rain process attributed to the influencing of upper and lower shear lines,the surface cold front and the southerly low-level jet streams blocked by Northwest Pacific subtropical high together.The heavy rain occurred in the area of updraft triggered by the wet Q-vector.There was obvious secondary circulation around the updraft.The convergence center of the wet Q-vector and the convergence area between the north and west of the center on 700 hPa were the areas where the torrential rain occurred.Along with the development of heavy rain system the convergence area could correspond to the heavy precipitation area better.
【Fund】: 国家自然科学基金项目(40675032);; 中国气象局成都高原气象研究所开放基金资助~~
【CateGory Index】: P458.121.1
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