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《Plateau Meteorology》 2011-06
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Moist Helicity Analysis of a Heavy Rainstorm in Sichuan Basin Induced by Plateau Vortex Moving Eastward

HUANG Chu-hui1,LI Guo-ping2,NIU Jin-long3,LUO Ling4,ZHANG Wei5(1.Sichuan Provincial Meteorological Office,Chengdu 610072,China; 2.College of Atmospheric Sciences,Chengdu University of Information Technology/The Key Laboratory of Plateau Atmosphere & Environment of Sichuan Province,Chengdu 610225,China; 3.Chengdu Meteorological Office of Sichuan Province,Chengdu 610071,China; 4.Ziyang Meteorological Office of Sichuan Province,Ziyang 641300,China; 5.Guang′an Meteorological Office of Sichuan Province,Guang′an 638000,China)  
Using NCEP 1°×1° reanalysis data and the different height data of conventional observation,a case of heavy rainstrom in Sichuan basin caused by plateau vortex moving eastward from 30 to 31 July 2009 was analyzed by both the synoptic and dynamic methods,including the moving of the plateau vortex,distribution of rainfall,transportations of water vapor and helicity.The results showed that distribution of 500 hPa moisture helicity can give good indicator to the distribution and center of rainfall,the moisture helicity increased in the period of severe precipitation.The moisture helicity can reflect the dynamic character of weather when the rainstorm occurs,and divergence of negative vorticity on upper level cooperated with convergence of positive vorticity and vapor rotate rising on lower leve1 is a dynamic mechanism to trigger rainstorm,which has a better positive correlation with precipitation area and distribution in the next 6 h.The severe precipitation center generally appears on the side of maximum gradient value of relative spiral.The results have a certain reference value to the forecast of precipitation area and intensity distribution.
【Fund】: 国家自然科学基金项目(40875023 40775032 40675059);; 灾害天气国家重点实验室2009开放课题(2009LASW-A01);; 中国气象局预报员专项(CMAYBY2011-044);; 四川省气象局2011年青年基金项目(2011-01)共同资助
【CateGory Index】: P458.121
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