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Asymmetry of Westerly and Easterly Wind Events: Observational Evidence

机译：西风和东风事件的不对称性：观测证据

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References(36) Supplementary materials(1) Westerly (WWEs) and easterly (EWEs) wind events, short-lived anomalous westerly and easterly surface winds, are known to occur with unusual large magnitude over the equatorial Pacific. As their relative frequency of occurrence and dependence on background conditions are yet to be fully clarified, we analyzed daily surface winds for 1982-2013 from which WWEs and EWEs are detected. Both types of events appear over the Pacific warm pool, where sea surface temperature (SST) is sufficiently high for active deep convection, and favorably occur with increasing Ni?o4 SST. However, the frequency of occurrence of EWEs is less than that of WWEs, resulting in asymmetry in wind amplitude. Local and remote anomalous convections are equally important in exciting these events, but different local development processes cause the asymmetry in the frequency of occurrence. These results can also be seen in wind stress anomalies, albeit obscured due to nonlinearity therein.
机译：参考文献（36）补充材料（1）已知在赤道太平洋上发生西风（WWE）和东风（EWE），短暂的异常西风和东风表面风。由于它们的相对发生频率和对背景条件的依赖性尚待完全弄清，我们分析了1982-2013年的每日地面风，从中检测到WWE和EWE。两种类型的事件都出现在太平洋暖池上，那里的海面温度（SST）足够高，可以进行有效的深对流活动，并且随着Ni？o4 SST的增加而有利地发生。但是，EWE的发生频率小于WWE的发生频率，导致风振幅不对称。局部和偏远对流对激发这些事件同样重要，但是不同的局部发育过程会导致发生频率的不对称性。这些结果也可以在风应力异常中看到，尽管由于其中的非线性而被掩盖了。

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