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《Journal of Zhejiang University(Science Edition)》 2008-03
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An analysis of the reasons for "9.3" abrupt heavy reainstorm in Changhua

CHEN Li-fang(Hangzhou Meteorological Office,Hangzhou 310008,China)  
Systematical analyses were carried out for an abrupt heavy rainstorm in Changhua of Zhejiang Province on September 3,2005.The results show that because of the easterlies and westerlies confronting each other,the circulation was stabilization.Saddle-circulation was the background of this storm.Dynamic and thermal function by the special relief were use of the forming of perpendicular circulation.The weakly cold air inflow boundary led to the convection.The montanic climate and cold air inflow from riverway made the warm air climb up.The airflow combinated with the perpendicular circulation made by relief.The important vapour source was the easterly jet on the second quadrant of typhoon "caidie" and on the bottom of subtropical high pressure belt.Vapour convergence was mostly on the lower troposphere.The convergence of wind direction and speed had been kept for a long time,and it resulted in the rain cluster stagnating.The potential vorticity disturbance of the upper troposphere was an important factor for the occurrance and development of the storm.The storm is accompanied with the high energy and high wet regions.
【Fund】: 浙江省气象科技计划项目资助(2006qn010)
【CateGory Index】: P458.121.1
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