1949—2010年西北太平洋热带气旋特征分析

文章分析了1949—2010年发生在西北太平洋上的热带气旋的空间分布特征。并利用趋势分析、小波分析和滑动t检验方法分析了热带气旋的年际变化特征、季节变化特征、周期特征和突变特征。结果表明:西北太平洋热带气旋多生成于5~25°N,110~170°E的海域。频数的年际变化存在三个阶段,月际变化明显,集中出现在7—10月。整个时域上10~15a的波动明显,并经历了三次突变过程。62a间强热带风暴生成最多,台风次之,热带风暴最少。热带气旋强度的年变化不明显。热带气旋强度越强,频数最大值的月份出现越晚。亚洲季风和西太平洋副高对热带气旋的产生起很大的作用。

Statistical Analysis on Tropical Cyclone of Northwestern Pacific from 1949 to 2010 Years

The spatial and temporal distribution characteristics of Tropical Cyclone in the Northwestern Pacific from 1949 to 2010 years were analyzed.The characteristics of annual change,seasonal change,period and mutation were analyzed using trend analysis,wavelet analysis and moving t-test technique.The results showed as follow.Most tropical cyclone in the Northwestern Pacific generated in 5-25°N,110-170°E area.The annual viration of tropical cyclone had three stages.Most tropical cyclone generated between July and october.The most obvious periodicity of tropical cyclone was 10-15 years and the tropical cyclone number had 3 mutations.The severe tropical storm was the most and the tropical storm was the least in all tropical cyclones during 1949-2010.And the stronger of tropical cyclone was,the later of the maximum tropical cyclone number appeared.Asia monsoon and subtropical high had obvious influences on tropical cyclogenesis.