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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Decadal variability of the Pacific Subtropical Cells and its relevance to the sea surface height in the western tropical Pacific during recent decades
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Decadal variability of the Pacific Subtropical Cells and its relevance to the sea surface height in the western tropical Pacific during recent decades

机译：近几十年来，太平洋热带副热带地区的年代际变率及其与海平面高度的相关性

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摘要

Decadal variability of the Pacific Subtropical Cells (STCs) and associated sea surface height (SSH) in the western tropical Pacific during recent decades are examined by using an historical OGCM simulation. The model represents decadal variations of the STCs concurrent with tropical Pacific thermal anomalies: the eastern tropical Pacific is warmer when the STCs are weaker and cooler when they are stronger. The spatial patterns of the SSH in the western tropical Pacific show different features, depending on events associated with decadal variability. During the warm phase (1977–1987), the SSH anomalies exhibit deviations from a meridionally symmetric distribution, with weakly positive (strongly negative) anomalies in the western tropical North (South) Pacific. Analysis of the heat budget in the upper tropical Pacific indicates that the termination of the warm phase around 1985 results from a poleward heat transport anomaly that is induced by a horizontal gyre associated with the SSH anomalies. During the cold phase (1996–2006), in contrast, the SSH anomalies are nearly meridionally symmetric, with positive anomalies in both hemispheres. Enhanced easterly wind anomalies contribute to the development of the cold phase after the late 1990s.
机译：通过使用历史OGCM模拟，研究了热带热带太平洋近几十年来太平洋亚热带细胞（STC）的年代际变化和相关海面高度（SSH）。该模型表示与热带太平洋热异常同时发生的STC年代际变化：当STC较弱时，东部热带太平洋较暖，而较强时则较冷。 SSH在热带西太平洋的空间格局显示出不同的特征，这取决于与年代际变率相关的事件。在暖期（1977–1987年），SSH异常表现出偏离子午对称分布，在热带北部（南）太平洋中表现为弱正（强负）异常。对热带上太平洋太平洋热量收支的分析表明，1985年左右暖期的终止是由与SSH异常相关的水平回旋带引起的极热传输异常引起的。相反，在寒冷阶段（1996-2006年），SSH异常几乎是子午线对称的，在两个半球都具有正异常。 1990年代后期以来，增强的东风异常促进了冷期的发展。

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