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对全球三大洋热带风暴的统计分析表明 ,全球热带风暴在时空分布上具有明显的统计特性 .各海域热带风暴都具有季节集中性 .在太平洋和印度洋 ,风暴发生频繁的时间在地理位置上有沿逆时针移动的分布 .全球风暴总数在 8月、9月份明显偏多 ,在 4月、5月份明显偏少 .北半球风暴扩展范围和分布密度大于南半球 ,并以东北太平洋和西北太平洋风暴分布密度为最大 .各海域热带风暴发生频数在统计长度(3 3a)内都表现年际和 1 0年际“振荡” ,不同程度地存在 2～ 3a ,6～ 7a ,1 1～ 1 2a及2 1～ 2 3a的重复性变化 .较强的风暴 ,往往寿命也较长 .在月份之间比较 ,风暴在多发月份 ,一般平均寿命较长 ,强度也较大 ;而在年度之间比较 ,风暴在多发年度 ,平均寿命却往往较短 ,强度也较小 .风暴在大尺度环境中较好地沿反气旋路径向高纬度运动 .
The statistical analysis of the three tropical cyclones in the world shows that the global tropical cyclones have obvious statistical characteristics in terms of space-time distribution, and the tropical cyclones in each sea area are seasonally concentrated.In the Pacific Ocean and the Indian Ocean, the frequent storms occur geographically The total number of global storms in August and September was obviously more than that in April and May, and the storm scope and distribution density in the northern hemisphere was greater than that in the southern hemisphere. The storms in the northeastern Pacific and the northwestern Pacific were distributed as The maximum frequency of the tropical storms in each sea area shows an annual and an “anomaly” of 10 years in the statistical length (3 to 3 years), varying from 2 to 3 years, 6 to 7 years, 11 to 12 months and 21 to 21 years, 2 3a repeatability changes.Higher storms tend to have longer longevity.Compared with the months, the storms generally have longer average life expectancy and greater intensity in multiple months, while in the annual comparison, the storms are frequent In the year, the average life expectancy tends to be shorter and less intense, and the storm moves well in high-latitude along the anti-cyclone path in a large-scale environment.