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首页> 外文期刊>International Journal of Climatology: A Journal of the Royal Meteorological Society >Intraseasonal variability of the tropical Pacific subsurface temperature in the two flavours of El Nino
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Intraseasonal variability of the tropical Pacific subsurface temperature in the two flavours of El Nino

机译：El Nino两种风味的热带太平洋次表层温度的季节内变化

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摘要

The spatial structure and temporal evolution of the intraseasonal variability (ISV) of the subsurface ocean temperature (STA) in the equatorial Pacific associated with the two flavours of El Nino [i.e. the canonical or eastern Pacific (EP) El Nino and the central Pacific (CP) El Nino] are investigated using observations and 1.5-layer linear reduced gravity model. Results suggest that the ISV characteristics show some differences in the two types of El Nino, although both oscillate along the thermocline in the form of the intraseasonal equatorial Kelvin wave (IEKW), which is excited in the western tropical Pacific by the zonal wind stress associated with the Madden-Julian oscillation (MJO). First, the period of dominant mode of the STA ISV during CP El Nino broadly distributes in 50-80 days with the spectra peaking in 60-65 days. By contrast, the spectrum of STA ISV during EP El Nino shows a peak in 75-80-day period. This indicates that the wave speed is faster in the CP El Nino than in EP El Nino. Second, the ISV activity peaks in previous spring during the developing phase of EP El Nino, whereas during CP El Nino it becomes the most active during the mature phase. Third, the strongest IEKW occurs in the CP around the dateline during CP El Nino and attenuates quickly east of 130 degrees W due to strong eddy viscosity dissipation, while the IEKW during the EP El Nino propagates efficiently from the western to the eastern Pacific with a relative weak diffusion.
机译：与厄尔尼诺现象的两种风味有关的赤道太平洋海表温度（STA）的季节内变化（ISV）的空间结构和时间演变。 [标准]或东太平洋（EP）厄尔尼诺和中太平洋（CP）厄尔尼诺]使用观测资料和1.5层线性降重力模型进行了研究。结果表明，ISV特征在两种类型的厄尔尼诺现象上都表现出一些差异，尽管两者均以季内赤道开尔文波（IEKW）的形式沿温跃层振荡，在热带热带西部受到纬向风应力相关的激发马登-朱利安振荡（MJO）。首先，CP El Nino期间STA ISV的主导模式时期广泛分布在50-80天，光谱峰值在60-65天。相比之下，EP El Nino期间STA ISV的光谱显示在75-80天期间达到峰值。这表明CP El Nino中的波速比EP El Nino中的波速快。其次，ISV活性在EP El Nino的发育阶段的前一个春季达到峰值，而在CP El Nino的发育过程中，ISV活性在成熟阶段变得最活跃。第三，最强的IEKW发生在CP El Nino时期的日线附近，由于强烈的涡流粘度消散，在130 W以东迅速衰减，而EP El Nino时期的IEKW则从西向东太平洋高效传播。相对较弱的扩散。

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