西北太平洋热带气旋风压关系的变异分析

Variational analysis of the relationship between wind and pressure of tropical cyclones in Northwest Pacific

利用1949～2008年共60年的热带气旋(TC)历史资料,分析TC中心最低气压和平均最大风速的相互关系,发现存在阶段性特征变异,继而对其进行了定量分析,得出过去60年中国整编的历史热带气旋资料中,风压关系序列前后明显不一致,存在变异现象,其变异点有两个,即1971/1972年、1974/1975年,其中以前者最为明显。推荐在研究热带气旋历史变化规律时,使用基于中心最低气压的强度指标作为基础依据。

Using 60 years historical tropical cyclone （TC） data from 1949 through 2008, the relationship between the minimum TC central pressure and the maximum TC mean wind speed is analyzed in this study. As a result, a phase variation in TC characteristics is found. Further quantitative analysis on the variation is conducted. The result shows that an apparent inconsistency may exist in the wind-pressure relationship in the compilation of the 60 years TC data set, or the phenomenon of sequential variations. Specifically, two change points are found in 1971/1972 and 1974/ 1975, and the former is more pronounced than the later. Finally we recommend that it is better to use the lowest cen- tral pressure as the strength index for the study of TC historical variation.