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《Journal of Tropical Meteorology》 2014-03
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A MESOSCALE STUDY OF EXTREME RAINFALL ALONG THE EASTERN COAST OF HAINAN ISLAND IN OCTOBER 2010

WANG Hui-jie;SUN Jian-hua;ZHAO Si-xiong;FU Shen-ming;Key Laboratory of Cloud-Precipitation Physics and Severe Storms(LACS) Institute of Atmospheric Physics,China Academy of Science;University of Chinese Academy of Sciences;Meteorological Observatory, Unit 95968;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology;International Center for Climate and Environment Sciences (ICCES), Institute of Atmospheric Physics,China Academy of Science;  
The synoptic circulation and mesoscale systems related to extremely heavy rainfall over the eastern coast of Hainan Island on 5 October 2010 are analyzed by using NECP reanalysis data and multiple observational data(surface intensive observation, Doppler radar data and satellite data). The active ITCZ and tropical depression over South China Sea are the favorite synoptic condition for the record heavy rainfall. A mesoscale convergence line formed as the easterly wind was affected by the topographic distribution in the eastern coast. Mesoscale convective systems moved northward and developed along the convergence line to Qionghai. Based on data analysis, the output of WRF model is used to examine the physical processes that resulted in extremely heavy rainfall over the eastern coast. There was a mesoscale convective zone along the eastern coast, on which active meso-β convective systems(MCS) originating from the rear portion of the convection band developed from south to north. Once the MCS moved close to Qionghai, it developed strongly, accompanied by the intensification of an easterly low-level jet(LLJ). The calculation of vorticity budget and moist Froude number revealed that the intensification of LLJ resulted in a strong vertical wind shear and a large tilting term. The mesoscale topography in the middle of Hainan Island is favorable for the formation and maintenance of the MCSs when they move close to the northeastern slope, where with a medium value of topographic Fw, the flows around the topography are lifted up, so that the horizontal vorticity is transferred to vertical vorticity through the tilting term, and the topographic blocking effect slows down the MCSs movement, which is beneficial to the formation of the extreme rainfall upstream.
【Fund】: 国家重点基础研究规划项目(2012CB417201);; 国家自然科学基金项目(41075032、41205027)共同资助
【CateGory Index】: P458.121.1
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