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Impact of Quasi-decadal Variability in the Tropical Pacific on ENSO Modulations

机译:热带太平洋准年代际变化对ENSO调制的影响

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摘要

The impact of quasi-decadal (QD: 8 to 18 years) variability in the tropical Pacific on ENSO events is investigated. It is found that there is a significant difference in the behavior of ENSO events between the phases of positive and negative anomalies of the QD Nino-3.4 index. During the period of negative QD-scale Nino-3.4 index, ENSO events, especially La Nina events, occur more frequently, and larger amplitudes of thermal anomalies related to El Nino events appear over the central to eastern equatorial Pacific. Furthermore, propagations of upper ocean heat content anomaly and a phase relationship between upper ocean heat content and Nino-3 index in the equatorial Pacific, which have been pointed out by previous studies, are clearly detected during the period of negative QD Nino-3.4 index.
机译:研究了热带太平洋准年代际(QD:8至18年)的变化对ENSO事件的影响。发现在QD Nino-3.4指数的正异常和负异常之间,ENSO事件的行为存在显着差异。在QD尺度Nino-3.4指数为负期间,ENSO事件(尤其是拉尼娜事件)发生的频率更高,与厄尔尼诺事件有关的热异常幅度更大,出现在赤道中东部。此外,先前的研究已经指出,在负QD Nino-3.4指数期间,可以清楚地检测到赤道太平洋高空热量含量异常的传播以及高空热量含量与Nino-3指数之间的相位关系。 。

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