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首页> 外文期刊>Geophysical Research Letters >Relationship between the southern oscillation index and tropical cyclone tracks in the eastern North Pacific
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Relationship between the southern oscillation index and tropical cyclone tracks in the eastern North Pacific

机译：北太平洋东部南部振荡指数与热带气旋径迹的关系

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摘要

Points of origin and downgradation of tropical cyclones in the eastern North Pacific (ENP) east of 160°W are related to the Southern Oscillation Index (SOI) during the hurricane season. All ENP tropical storms and hurricanes from 1996 through 1997 were grouped into three SOI-based categories: those occurring during strong El Nino events (mean SOI < -0.6), strong La Nina events (mean SOI > 0.6), or near zero periods (-0.6 < mean SOI < 0.6). During El Nino storm seasons, ENP tropical cyclones originated approximately 5.7° (617 km) west and downgraded 7.5° (780 km) west of the long-term mean longitudes for the positive SOI group. Near zero group storms also followed more northerly tracks than the negative SOI group storms. However, no significant differences in storm track are evident between the positive SOI and near zero groups, and the track length is not significantly different for any storm group.
机译：160°W以东的北太平洋东部（ENP）的热带气旋的起源和降级点与飓风季节的南方涛动指数（SOI）有关。从1996年到1997年，所有ENP热带风暴和飓风都分为基于SOI的三类：在强厄尔尼诺事件（平均SOI <-0.6），强La Nina事件（平均SOI> 0.6）或接近零周期（ -0.6 <平均SOI <0.6）。在厄尔尼诺风暴季节，ENP热带气旋起源于西经大约5.7°（617公里），而SOI长期平均经度下降了7.5°（780公里）。与负SOI群风暴相比，接近零群风暴也遵循更北偏的轨迹。但是，在正SOI和接近零的组之间，风暴轨迹没有明显差异，对于任何风暴组，轨迹长度也没有明显差异。

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