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A Case Study of Plateau Vortex Moving East Ward with Heavy Rainfalls Based on Helicity and Non-Geostrophic Wet Q-Vector

HUANG Chu-hui1,LI Guo-ping2 (1.Sichuan Provincial Meteorological Office,Chengdu 610072,China;2.College of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,China)  
Using NCEP global 1°×1° final-analysis data and the routine observation data,with the theories of helicity and non-geostrophic wet Q-vector,a case of Plateau vortex moving east which caused heavy precipitation was analyzed by both synoptic analysis and dynamic methods.The results show that 500 hPa horizontal distribution of z-helicity can give good direction to the movement of vortex center and distribution of rainfall,the heavy precipitation is located in the great grads of positive helicity.z-helicity can reflect the dynamic character of weather when the rainstorm occurred,and divergence of negative vorticity on higher level matched convergence of positive vorticity on lower leve1 is a dynamic mechanism to trigger heavy precipitation.Relative spiral of more comprehensively reflect the rainfall districts and rainfall distribution center,and the next 6 h after the precipitation to the districts and have a better prediction of heavy precipitation occurred in a relatively central spiral of plus and minus centres connect the maximum gradient value of the positive side.Low level convergence of non-geostrophic wet Q-vector as a powerful tool to diagnose precipitation qualitatively has good relation to rain falls,convergence center are correlation with precipitation intensity;cross-section of wet Q-vector divergence provided good reference information for the distribution and movement of precipitation.
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