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首页> 外文期刊>Ocean Dynamics >The emergence of equatorial deep jets in an idealised primitive equation model: an interpretation in terms of basin modes
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The emergence of equatorial deep jets in an idealised primitive equation model: an interpretation in terms of basin modes

机译：理想化的原始方程模型中赤道深喷的出现：对盆地模式的解释

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摘要

Ocean circulation models do not generally exhibit equatorial deep jets (EDJs), even though EDJs are a recognised feature of the observed ocean circulation along the equator and they are thought to be important for tracer transport along the equator and even equatorial climate. EDJs are nevertheless found in nonlinear primitive equation models with idealised box geometry. Here we analyse several such model runs. We note that the variability of the zonal velocity in the model is dominated by the gravest linear equatorial basin mode for a wide range of baroclinic vertical normal modes and that the EDJs in the model are dominated by energy contained in vertical modes between 10 and 20. The emergence of the EDJs is shown to involve the linear superposition of several such neighbouring basin modes. Furthermore, the phase of these basin modes is set at the start of the model run and, in the case of the reference experiment, the same basin modes can be found in a companion experiment in which the amplitude of the forcing has been reduced by a factor of 1000. We also argue that following the spin-up, energy must be transferred between different vertical modes. This is because the model simulations are dominated by downward phase propagation following the spin-up whereas our reconstructions imply episodes of upward and downward propagation. The transfer of energy between the vertical modes is associated with a decadal modulation of the EDJs.
机译：尽管EDJ是沿赤道观测到的海洋环流的公认特征，但海洋环流模型一般不会表现出赤道深部喷流（EDJ），并且它们被认为对于沿赤道甚至赤道气候的示踪物运输很重要。尽管如此，在具有理想箱形几何形状的非线性本原方程模型中仍然可以找到EDJ。在这里，我们分析了几种这样的模型运行。我们注意到，模型中纬向速度的变化主要由大范围斜斜垂直法向模式的最严重的线性赤道盆地模式主导，而模型中的EDJ则由10至20之间的垂直模式中的能量主导。 EDJ的出现被证明涉及几种这样的邻近盆地模式的线性叠加。此外，这些盆地模式的相位是在模型运行开始时设置的，在参考实验的情况下，可以在伴随实验中找到相同的盆地模式，在该实验中，强迫幅度已减小了一个。系数为1000。我们还认为，在加速旋转之后，必须在不同的垂直模式之间传递能量。这是因为模型模拟主要受旋转后的向下相位传播的支配，而我们的重构则暗示了向上和向下传播的事件。垂直模式之间的能量转移与EDJ的十年调制有关。

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  • 来源
    《Ocean Dynamics》 |2017年第12期|1511-1522|共12页
  • 作者

    Matthiessen Jan-Dirk; Greatbatch Richard John; Claus Martin; Ascani Francois; Brandt Peter;

  • 作者单位

    GEOMAR Helmholtz Ctr Ocean Res Kiel, Duesternbrooker Weg 20, D-24105 Kiel, Germany;

    GEOMAR Helmholtz Ctr Ocean Res Kiel, Duesternbrooker Weg 20, D-24105 Kiel, Germany|Univ Kiel, Fac Math & Nat Sci, Kiel, Germany;

    GEOMAR Helmholtz Ctr Ocean Res Kiel, Duesternbrooker Weg 20, D-24105 Kiel, Germany|Univ Kiel, Fac Math & Nat Sci, Kiel, Germany;

    Univ Hawaii Manoa, Dept Oceanog, 1000 Pope Rd, Honolulu, HI 96822 USA;

    GEOMAR Helmholtz Ctr Ocean Res Kiel, Duesternbrooker Weg 20, D-24105 Kiel, Germany|Univ Kiel, Fac Math & Nat Sci, Kiel, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ocean circulation model; Equatorial deep jets; Basin modes; Spin-up;

    机译：海洋环流模式;赤道深喷射;盆地模式;自旋;

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