摘要
分析福建近千余年25次的龙卷风记载，得出如下几点认识：（）福建的龙卷均在春夏两季，且几率相近；1949年以来的IZ次龙卷有11次出现于13－18时（占92％），另一次是上午9时（占8％）。空间分布为：沿海地区有ZO次，占SO％；内陆5次，占ZO％。且有多发地段。（2）龙卷风多出现于低压、高温、高湿点附近，天空以积雨云占多数，地面多有强风相伴。（）福建12次龙卷风的诱发系统为：台风（6次，均在7－9月）；冷锋（4次，均在5一6月）；几线（2次，均在4月）；雷雨胞单体（于锋前，2次）。（4）就强度与灾害而论，与台风、跑线相伴的龙卷风为强、为重；与锋面相伴者，为弱、为轻。
25 tornado events in Fujian Proviuce about a thousand years were analysed. The results show that, (1 ) tornado occured in both spring and summer,and its frequency is similar. 11 cases of 12 tornados since 1949 were at 13 to 18 o'clock (92% ),and the other was at 9 a. m. (8%);(2) tornado was of ten near the location of low pressure, high temperature and humidity, It was most accompanied by the cumulonimbus and strong wind above surface; (3) the systems induced 12 tornados were of typhoon (6 times,during July to September),cold front (4 times, May and June ),squall line (2 times, in April) and thundery cell (2 times);and (4) according to their intensity and damage,tornados accompaning typhoon and squall line were stronger than others.
出处
《气象》
CSCD
北大核心
1996年第7期36-39,共4页
Meteorological Monthly
关键词
龙卷风
时空分布
活动特点
tornado spatial and temporal distribution active features
