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首页> 外文期刊>Journal of Climate >Eastern Equatorial Pacific Forcing of ENSO Sea Surface Temperature Anomalies
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Eastern Equatorial Pacific Forcing of ENSO Sea Surface Temperature Anomalies

机译：ENSO海面温度异常的赤道东太平洋强迫

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摘要

Previous studies have described the impacts of wind stress variations in the eastern Pacific on sea surface temperature (SST) anomalies associated with the El Nino-Southern Oscillation (ENSO) phenomenon. However, these studies have usually focused onindividual El Nino events and typically have not considered impacts on La Ninanhe cold phase of the ENSO cycle. This paper examines effects of wind stress and heat flux forcing on interannual SST variations in the eastern equatorial Pacific from sensitivity tests using an ocean general circulation model over the period 1980-2002. Results indicate that in the Nino-3 region (5 deg N-5 deg S, 90 deg -150 deg W) a zonal wind stress anomaly of 0.01 N m~(-2) leads to about 1 deg C SST anomaly and that air-seaheat fluxes tend to damp interannual SST anomalies generated by other physical processes at a rate of about 40 W m~(-2) (~cC)~(-1). These results systematically quantify expectations from previous event specific numerical model studies that local forcing in the eastern Pacific can significantly affect the evolution of both warm and cold phases of the ENSO cycle. The results are also consistent with a strictly empirical analysis that indicates that a wind stress anomaly of 0.01 N m~(-2) leads to ~1 degC SST anomaly in the Nino-3 region.
机译：先前的研究已经描述了东太平洋风应力变化对与厄尔尼诺-南方涛动（ENSO）现象相关的海面温度（SST）异常的影响。但是，这些研究通常集中于单个厄尔尼诺事件，并且通常没有考虑对ENSO周期的拉尼南河寒冷期的影响。本文利用海洋总体环流模型在1980-2002年期间进行的敏感性试验，研究了风应力和热通量强迫对赤道东太平洋海表温度年际变化的影响。结果表明，在Nino-3区域（北纬5度，北纬90度-150度），0.01 N m〜（-2）的纬向风应力异常导致SST异常约1℃，而空气-海热通量倾向于以约40 W m〜（-2）（〜cC）〜（-1）的速率抑制其他物理过程产生的年际SST异常。这些结果系统地量化了先前事件特定数值模型研究的期望值，即东太平洋的局部强迫会显着影响ENSO周期的暖期和冷期的演变。结果也与严格的经验分析一致，该经验表明0.01 N m〜（-2）的风应力异常导致Nino-3地区的〜1 deg SST异常。

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