To understand the diversity of the El Niño-Southern Oscillation (ENSO) under the background of Pacific decadal oscillation (PDO) during recent decades, characteristics of westerly wind bursts (WWBs) during positive and negative phases of the PDO were analyzed. It is shown that, during the ENSO developing period, the El Niño evolution may be affected by stronger or more frequent WWBs in the positive PDO phase than in the negative PDO phase. The sustained effects of atmospheric dynamics on the equatorial ocean can be indicated by the accumulated WWB strength, which contains most WWB characteristics, including the accumulated days, occurrence frequency, strength, and spatial range of WWBs. The synoptic/climate systems that are directly related to WWBs show a wider spatial distribution in the positive PDO phase than in the negative PDO phase.

中文翻译：

---

PDO正相位和负相位之间的西风爆发的统计比较

为了了解近几十年来太平洋年代际振荡（PDO）背景下的厄尔尼诺-南方涛动（ENSO）的多样性，分析了PDO正相位和负相位的西风爆发特征（WWB）。研究表明，在ENSO的发展时期，正PDO阶段比负PDO阶段更强或更频繁的WWB可能会影响厄尔尼诺的演化。大气动力学对赤道海洋的持续影响可以通过累积的WWB强度来表示，该强度包含WWB的大多数特征，包括WWB的累积天数，出现频率，强度和空间范围。与WWB直接相关的天气/气候系统在正PDO阶段显示比在负PDO阶段更大的空间分布。