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首页> 外文期刊>Journal of Physical Oceanography >Diagnosing the Annual Cycle of the Equatorial Undercurrent in the Atlantic Ocean from a General Circulation Model
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Diagnosing the Annual Cycle of the Equatorial Undercurrent in the Atlantic Ocean from a General Circulation Model

机译：利用一般环流模型诊断大西洋赤道暗流的年周期

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摘要

Ten-year-long output series from a general circulation model forced by daily realistic winds are used to analyze the annual cycle of the Equatorial Undercurrent (EUC) in the Atlantic Ocean. Two well-defined transport maxima are found: One, present during boreal summer and autumn in the central part of the basin, is generally recognized and regarded as a near-equilibrium response to the equatorial easterly trades that culminate in this period. Another one, most pronounced near the western boundary, occurs in April-May when the trades relax. This second maximum is less patent in the observations, but concomitant signals in previously published analyses of the North Brazil Current and surface velocity seasonal variations might be indirect manifestations of its reality. Because this intensification appears at periods when the boundary between the tropical and equatorial gyres nears the equator, the authors relate its existence to wind stress curl variations at subequatorial latitudes. A link between the interannual variability of the spring transport maximum and that of the low-latitude wind stress curl is, indeed, found in the model. This diagnostic approach suggests that two different dynamical regimes shape up the EUC seasonal cycle: in summer and autumn, local forcing by the equatorial zonal wind component and main supply from the ocean interior; in winter and spring, remote forcing by the low-latitude rotational wind component and supply from the western boundary currents.
机译：来自每日逼真的风强迫的一般环流模型的十年输出序列用于分析大西洋赤道暗流（EUC）的年度周期。发现了两个明确定义的运输最大值：一个位于盆地中部的夏季和秋季的北半球，通常被认为是对这一时期达到高潮的赤道东向贸易的近乎平衡的反应。另一个交易最明显的交易发生在西部边界附近，发生在4月至5月交易放松时。第二个最大值在观测中没有多少专利权，但是在先前发表的对巴西北部的分析中，伴随的信号是当前和地面速度的季节性变化可能是其现实的间接体现。由于这种加剧出现在热带和赤道涡旋之间的边界接近赤道的时期，因此作者将其存在与赤道纬度处的风应力卷曲变化联系起来。实际上，在模型中发现了春季运输最大值的年际变化与低纬度风应力卷曲之间的联系。这种诊断方法表明，两种不同的动力机制构成了EUC的季节性周期：夏季和秋季，赤道纬向风分量和海洋内部的主要供应对当地的强迫；在冬季和春季，低纬度的旋转风分量和来自西部边界流的补给产生了远程强迫。

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