Abstract Westerly Wind Events (WWEs) over the tropical Pacific are characterized by their spatiotemporal diversity and classified into six types based on their different locations and durations. Various types of WWEs exhibit quite different characteristics in terms of their amplitudes. The long events with a 10–30-day duration are stronger than the short events with a 6–10-day duration, and the maximum amplitudes of the Central-Pacific (C) type and Eastern-Pacific (E) type of long events are larger than the Western-Pacific (W) type of long ones. The evolutions of these six types of WWEs are also quite different. The W-type short and long events and the C-type long events show a distinct eastward propagation, whereas the C-type short events and the E-type short and long events have no apparent propagation direction. We demonstrate that such a difference in the eastward propagation of WWEs can be significantly associated with the Madden-Julian Oscillation (MJO). The W-type events are more influenced heavily by the MJO, as indicated by their more distinct eastward propagation patterns, than the two other types of WWEs. In addition to the MJO, the convectively coupled Kelvin waves are also associated with the WWEs, especially for the short events.

中文翻译：

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诊断热带太平洋西风事件的时空多样性

摘要 热带太平洋西风事件（WWEs）具有时空多样性的特点，根据发生地点和持续时间的不同将其分为六种类型。各种类型的 WWE 在其振幅方面表现出截然不同的特征。持续时间10～30天的长事件强于持续时间6～10天的短事件，中太平洋（C）型和东太平洋（E）型长事件的最大振幅比西太平洋 (W) 型长的要大。这六种类型的WWE的演变也大不相同。W型短长事件和C型长事件表现出明显的东向传播，而C型短事件和E型短长事件没有明显的传播方向。我们证明了 WWE 向东传播的这种差异可能与 Madden-Julian Oscillation (MJO) 显着相关。与其他两种类型的 WWE 相比，W 型事件受 MJO 的影响更大，正如它们更明显的向东传播模式所表明的那样。除了 MJO 之外，对流耦合开尔文波也与 WWE 相关，尤其是对于短赛事。