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首页> 外文期刊>Acta Oceanologica Sinica >Preliminary study on decadal variations of E1 Nino-associated adjustment in the tropical Pacific thermocline
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Preliminary study on decadal variations of E1 Nino-associated adjustment in the tropical Pacific thermocline

机译：热带太平洋温跃层中E1 Nino相关调整的年代际变化的初步研究

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摘要

Statistical analysis about ENSO index represented by SSTA in Nino3 with several datasets shows obviously decadal changes in the dominant period and amplitude of ENSO. Correlation analysis about the composite El Nino events before and after 1976 exhibits obviously decadal changes in the propagation and intensity of the oceanic anomaly related to the variation of SSTA in Nino3. In the composite El Nino before 1976, the coherence is relatively weak between the oceanic, anomaly in the tropical Pacific and the SSTA in the Nino3 region; the area with significant correlation coefficient is relatively small; the oceanic anomaly related to Nino3 SSTA propagates faster. The above changes correspond well to the decadal changes of ENSO cycles. Some preliminary explanations are given based on the analysis of the decadal changes in the thermocline. The tropical thermocline shoals after 1976 except in the equatorial far East Pacific and the inclination of the tropical thermocline deep west and shallow east patterns weakens. Much of the oceanic anomaly from the relative higher latitude contributes to the slow propagation of the oceanic anomaly in the North Pacific. The air-sea coupling in the tropical Pacific intensifies after 1976 corresponding to decadal change of the ENSO amplitude. Decadal adjustment of the thermocline may have influenced the propagation and intensity of the oceanic anomaly related to the ENSO and intensity of air-sea interaction in the tropical Pacific, and changed the dominant period of ENSO and its amplitude.
机译：关于Nino3中SSTA代表的ENSO指数的统计分析表明，ENSO的主导周期和振幅有明显的年代际变化。 1976年前后厄尔尼诺事件的相关性分析表明，与NSTA3中SSTA的变化有关的海洋异常的传播和强度有明显的年代际变化。在1976年以前的厄尔尼诺复合材料中，热带太平洋的海洋异常和Nino3地区的SSTA之间的相干性相对较弱。相关系数显着较大的区域相对较小；与Nino3 SSTA有关的海洋异常传播得更快。上述变化与ENSO周期的年代际变化非常吻合。基于对热跃层年代际变化的分析，给出了一些初步的解释。 1976年以后热带热跃层浅滩除外，在赤道远东太平洋，热带热跃层的深西部和浅东部模式的倾角减弱。来自相对较高纬度的大部分海洋异常导致了北太平洋海洋异常的缓慢传播。与ENSO振幅的年代际变化相对应，1976年以后热带太平洋的海海耦合加剧。跃层的年代际调整可能影响了与ENSO有关的海洋异常的传播和强度以及热带太平洋中海气相互作用的强度，并改变了ENSO的主导时期及其振幅。

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