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《Guangdong Meteorology》 2009-06
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A Case Study of Continuous Torrential Rain in Guangdong during the Pre-flood Period in 2009

HUANG Xiao-dong1,LIANG Qiao-qian2,ZHENG Wei-jie1,LIANG Min-yan1(1.Jiangmen Meteorological Bureau,Jiangmen 529030,China;2.Guangzhou Central Meteorological Observatory,Guangzhou 510080,China)  
A continuous torrential rain case in the middle-west coastal areas of Guangdong from May 23rd through the 24th 2009 is analyzed using conventional ground-based observations and soundings,as well as unconventional data such as automatic weather stations,satellite products,and NECP/NCAR 1°×1° 6-hourly reanalysis data.The results are shown as follows: the characters of this torrential rain case are long duration,strong intensity,and area-concentrated with significant meso-α scale atmospheric motion;South China Sea mesoscale eddies and low-level jet moved northward quickly while the western pacific subtropical high maintained stable;There was favorable convergence coincident with the torrential rain area on the north flank of mesoscale eddies;The confluence of southwest monsoon flow from Bengal Bay and cross-equatorial flow from Somali and the area near 110oE came into a strong and narrow conveyer belt to transport sufficient moisture and unstable energy to the torrential rainfall areas;There were two mesoscale convective complexes(MCC) developing violently and resulting in the torrential rain;And the high-level circulation kept the MCCs quasi-stationary over the west of the Pearl River estuary.
【Fund】: 江门市气象局项目“江门地区暴雨的诊断分析”资助
【CateGory Index】: P458.121.1
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