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《Journal of Nanjing Institute of Meteorology》 2006-03
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A Case Analysis of Vortex-Merging Process in a Jianghuai River Valley Meiyu Rainstorm

LEI Zheng-cui~(1,3),REN Jian~2,MA Jing-xian~1, ZHOU Hui~1 (1.Department of Atmospheric Sciences,NUIST,Nanjing 210044,China;2.Jiangsu Meteorological Bureau,Nanjing 210008,China;3.Changzhou Meteorological Bureau,Changzhou 213001,China)  
A strong rainstorm occurred in the Jianghuai River Valley from 8th to 9th July 2003.The rainstorm case has been analyzed using the NCEP/NCAR reanalyzed data(4 times per day) including wind,humidity and height fields.The results show that the heavy rain was mainly associated with the merging of mesoscale vortices.The strengthening of the lower level convergence and upper level divergence was associated with the vortex-merging enhanced the updraft,moisture transfer and moist helicity,resulting in heavy precipitation.The allocation of lower level convergence and upper level divergence was favorable to the maintenance of strong updrafts,and the moisture and energy carried by the updrafts was in turn favorable to the genesis and development of convective cloud cluster.The warm moist flow from the Bay of Bengal and the South China Sea provided the rainstorm sufficient moisture.
【Fund】: 国家自然科学基金重点资助项目(40333028)
【CateGory Index】: P458.121
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