1971-2011年中国县级行政区域热带气旋基本气候特征

BASIC CLIMATIC CHARACTERISTICS OF TROPICAL CYCLONES IN COUNTY-LEVEL ADMINISTRATIONS OF CHINA DURING 1971-2011

借助ArcGis软件获取了1971—2011年中国县级行政区域内热带气旋活动的基本信息,包括经纬度、持续时间、强度等,并对这些信息进行了统计。结果显示,中国县域内热带气旋活动最多频次为台湾省花莲县,平均每年0.78次;最大平均强度出现在台湾省宜兰县,达到35 m/s;持续时间最长的为海南省乐东县,平均每年2.2 h;受热带气旋潜在影响程度最高的为台湾省台东县,年平均YTCPI(Yearly Tropical Cyclone Potential Impact Index)达到15 106。与此同时,对6—10月各月中国县域内的热带气旋活动特征进行了详细分析。结论有助于进一步了解中国县域受热带气旋影响的基本特征,为有关部门防台减灾提供参考。

By using the ArcGis software, the basic information for the activity of tropical cyclones in county-level administrative regions of China from 1971 to 2011 is obtained, including longitude and latitude, duration, and intensity, among others. With it, it is possible to study the influence the tropical cyclone makes on these regions. Results showed that the Hualian County in Taiwan province has the most frequency of tropical cyclones that pass through it, with an annual frequency of 0.78. The maximum average intensity appears in Yilan county Taiwan province, up to 35 m/s. The longest accumulative duration of the tropical cyclone activity is 2.2 h per year in average in Ledong county Hainan province. The most serious potential impact by tropical cyclone occurs in Taidong county Taiwan province as the Yearly Tropical Cyclone Potential Impact Index （YTCPI） is 15 106. Moreover, the monthly characteristics are analyzed during the typhoon season in this paper. Helpful in learning about the basic characteristics of the influences by tropical cyclones in the county-level administrations of China, the conclusions in this paper can be provided to the department concerned.