一次大暴雨天气过程的能量分析

The Circulation Pattern of 9608 Typhoon Torrential Rain and Its Energy Analysis

利用数值预报产品及能量方法分析了１９９５年８月２１—２３日鲁南和山东半岛地区大暴雨天气过程。结果表明：暴雨产生在低层高能舌、准饱和及对流不稳定的区域；５００ｈＰａ正涡度舌与８５０ｈＰａ暖切变及地面气旋中心相配合，产生较强的上升运动，触发对流不稳定能量释放，产生大暴雨。暴雨区的水汽来源于偏南气流的输送：鲁南暴雨区的水汽来源于西南气流，而半岛地区的水汽来源于东南沿海。

The torrential rain from 4 to 5 August,1996 in Beijing area is the result of interaction among typhoon low,subtropical high and shear line.Before torrential rain,the tongue of high energy stretched from Central China to North China,and the energy in Beijing area increased rapidly.In torrential rain area,not only did the southerly low level jet transport water vapour and energy to it,but also did the wind velocity fluctuation of the jet trigger the release of moist available potential energy.