摘要
本文按近海热带气旋强度突变的标准，对１９７０～１９９０年进入北部湾后强度发生突变的热带气旋进行分类统计，发现有如下的气候特征：每年平均有３２个热带气旋进入北部湾，其中强度变化不大的占总数的５２％；强度突然减弱的占总数的４２％；强度突然增强的占总数的６％。强度变化不大和强度突然减弱的发生在５～１１月，强度突然增强的发生在８～９月。本文对进入北部湾的热带气旋强度增强的天气类型进行分类，归纳起来分为四种天气类型：副热带高压型；赤道辐合带型；季风低槽型和锋面低槽型。
According to criteria for sudden change of tropical cyclone intensity in offshore,classification was done for the tropical cyclones which move into Beibu Gulf from 1970 to 1990.We have got the following climatic statistics:There are in average 3.2 tropical cyclones per year moving into Beibu Gulf,and from May to November 52% of the total is intensity changeless,42% of the total is intensity weakened,6% of the rest suddenly intensify from August to September. From our analysis it can bee seen that tropical cyclones which move into Beibu Gulf and intensity,are classified into four weather patterns:Subtropical-high,Equatorial belt of convergence,Southwest monsoon trough and Forntal trough patterns.These results will be greatly benificial to weather forecast.
出处
《海洋预报》
北大核心
1997年第1期56-63,共8页
Marine Forecasts
关键词
热带气旋
气候特征
强度变化
Tropical cyclones,Sudden intensity change,Climatic characteristic.
