CAJ | 학술논문

对2008年西北太平洋及我国南海热带气旋的活动特征进行总结,并从多方面分析其成因.结果指出:2008年西北太平洋热带气旋活动的主要特征为生成总数少,源地集中,位置偏西;登陆数多、时间早;登陆地点偏南、时间集中等.其原因主要在于:在热带气旋的多发期副热带高压面积偏大、强度偏强、西伸脊点异常偏西,且脊线偏南,造成西北太平洋热带地区盛行偏东风,不利于热带扰动的生成和发展;同时,也使得在其南侧生成的热带气旋易在偏东气流的引导下登陆我国南方.另外,季风槽、垂直风切变、海表温度和热带辐合带上的对流活动等因子的异常分布都不利于热带气旋在西北太平洋东部海域生成,直接导致这一年热带气旋生成总数明显偏少,源地显著偏西.
대2008년서북태평양급아국남해열대기선적활동특정진행총결,병종다방면분석기성인.결과지출:2008년서북태평양열대기선활동적주요특정위생성총수소,원지집중,위치편서;등륙수다、시간조;등륙지점편남、시간집중등.기원인주요재우:재열대기선적다발기부열대고압면적편대、강도편강、서신척점이상편서,차척선편남,조성서북태평양열대지구성행편동풍,불리우열대우동적생성화발전;동시,야사득재기남측생성적열대기선역재편동기류적인도하등륙아국남방.령외,계풍조、수직풍절변、해표온도화열대복합대상적대류활동등인자적이상분포도불리우열대기선재서북태평양동부해역생성,직접도치저일년열대기선생성총수명현편소,원지현저편서.
The characteristics of tropical cyclone(TC)over the western North Pacific(WNP)in 2008 were reviewed,and its causation was analyzed.The results showed that the humber of TC was less than the mean,the formative location was more concentrated and further west;the landing number was more than the normal,the first landed earlier,the landing position of TC was further south and landing time was more focused.The analyses of the main factors resulting in these anomalies showed that compared with means,the characteristics of the subtropical high were abnormal during the period of TC activity,including its arcs,strength,ridge position etc.which were unfavorable to the genesis and development of TC.And the anomaly distribution of important factors,such as the monsoon trough,vertical wind shear,sea surface temperature and OLR,was not favorable to the genesis of TC in the eastern WNP,which led to the decrease of TC number and the westward movement of genesis Iocation.