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首页> 外文期刊>Advances in Atmospheric Sciences >Roles of Multi-Scale Disturbances over the Tropical North Pacific in the Turnabout of 1997-98 El Nino
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Roles of Multi-Scale Disturbances over the Tropical North Pacific in the Turnabout of 1997-98 El Nino

机译：热带北太平洋多尺度干扰在1997-98年厄尔尼诺现象转折中的作用

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摘要

The space-time features of major vorticity disturbances over the western North Pacific during the 1997-98 El Nino ranked as one of the strongest events on record was investigated in this study. We distinguished the different roles that these disturbances had on different timescales in causing the reversal or turnabout of the El Nino event. Remarkable differences in the various disturbances of synoptic, intraseasonal, and interannual timescales were found in the time evolution, propagation, and in their contributions to the changes in near-equatorial zonal flow, which was crucial to the demise of the warm sea surface temperature anomalies in the central-eastern Pacific. It is hypothesized that the westward-traveling synoptic and intraseasonal oscillations in the western North Pacific might be considered as a self-provided negative feedback from the El Nino and played an additional role in its reversal in comparison with other interannual internal and external forcings. In this case, the off-equatorial synoptic and intraseaonal fluctuations served as a stochastic forcing for the tropical ocean and gave rise to the aperiodicity or irregularity of the El Nino-Southern Oscillation.
机译：在这项研究中，调查了1997-98年厄尔尼诺现象期间北太平洋西部主要涡度扰动的时空特征，这是有记录以来最强的事件之一。我们区分了这些扰动在不同时间尺度上导致厄尔尼诺事件的逆转或转向的不同作用。在天气演变，传播及其对近赤道纬向流变化的贡献中，发现天气，季节内和年际时间尺度的各种扰动存在显着差异，这对于暖海地表温度异常的消失至关重要在太平洋中东部。假设北太平洋西部的向西行进的天气和季节内振荡可能被认为是厄尔尼诺现象的自我提供的负反馈，并且与其他年际内部和外部强迫相比，在其逆转中起到了额外的作用。在这种情况下，赤道外天气和季节内波动是热带海洋的随机强迫，并导致了厄尔尼诺-南方涛动的非周期性或不规则性。

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