孟湾槽在百色市异常降雪天气中的作用

THE ROLE OF THE BAY OF BENGAL TROUGH IN THE ABNORMAL SNOWFALL PROCESSES IN BAISE CITY.

通过对1983年12月28日、2002年12月26日百色市两次异常降雪天气过程的对比分析,发现冬季孟加拉湾槽的发展东移在其中起到了关键性的作用。由于孟加拉湾槽前暖湿气流强盛,这种强盛的西南暖湿气流在低空冷空气堆(冷锋)上发生强烈的系统性上升运动,从而导致百色市及其邻近地区出现异常的雨雪天气。

Two abnormal snowfall events in Baise City on 28th Dec. 1983 and 26th Dec. 2002 are analyzed. The results show that the developing and eastward movin g of the Bay of Bengal trough in winter played a key role,especially on 500 hPa. In the southwest region of China, the short wave trough southeastward moving f rom the Tibetan Plateau merging with the Bay of Bengal trough could strengthen t he warm and moist stream lying in the front of the troughs and resulted in the e xtraordinary ascending motion from the c...