摘要
利用1949—2009年中国气象局热带气旋(TC:Tropical Cyclone)最佳路径数据集,对西北太平洋TC生成源地的时空分布、生成和登陆我国TC的年、月频数分布、强度分布和地理分布等气候特征进行统计分析。研究结果表明:在这61年中生成的TC呈减少趋势,登陆我国的TC数量比较稳定,不过近10年来登陆的较强TC数量却呈现出上升趋势;每年6—10月是TC高发期,强度等级越高的TC生成季节越偏晚,而8月是生成和登陆数量最多的月份;TC平均生命期随强度等级的增加而增大,且逐渐表现出单峰值分布特征;TC频数的地理分布以我国南海和菲律宾以东洋面为中心,向四周呈辐射状减少,近10年来其活动范围有所西伸加强。
The track data of tropical cyclones（TC） provided by the Chinese Meteorological Administrator from 1949 to 2009 are employed to analyze the climatic characteristics of TC activities over the Northwest Pacific,including the temporal-spatial variations of TC sources,the inter-annual and inter-monthly variation of the TCs formed and landed on China,the distribution of TCs intensity and tracks,etc.The results show that the number of TCs formed on China has been decreased for more than 60 years,although there was little change in the number of landfall TCs,but the high-intensity TCs increased in recent 10 years,with the peak period being from June to October,especially in August;the greater the intensity was,the later the TC occurred;the average life period of TCs increased with increasing TC intensity,with a single-peak pattern;as for the geographical distribution of TC occurrence frequency,TCs were mainly concentrated around the South China Sea and the ocean area east of Philippines,decreasing radially outward;however,the TCs tended to stretch westward with the intensity slightly increasing in recent 10 years.
出处
《气象科技》
2012年第2期249-255,共7页
Meteorological Science and Technology
基金
中国博士后基金项目(201150M1552)资助
关键词
西北太平洋
热带气旋
气候特征
western North Pacific
tropical cyclone
climatic characteristic
