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Time-Dependent Eddy-Mean Energy Diagrams and Their Application to the Ocean

机译：时变涡旋均值能量图及其在海洋中的应用

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Insight into the global ocean energy cycle and its relationship to climate variability can be gained by examining the temporal variability of eddy-mean flow interactions. A time-dependent version of the Lorenz energy diagram is formulated and applied to energetic ocean regions from a global, eddying state estimate. The total energy in each snapshot is partitioned into three components: energy in the mean flow, energy in eddies, and energy temporal anomaly residual, whose time mean is zero. These three terms represent, respectively, correlations between mean quantities, correlations between eddy quantities, and eddy-mean correlations. Eddy-mean flow interactions involve energy exchange among these three components. The temporal coherence about energy exchange during eddy-mean flow interactions is assessed. In the Kuroshio and Gulf Stream Extension regions, a suppression relation is manifested by a reduction in the baroclinic energy pathway to the eddy kinetic energy (EKE) reservoir following a strengthening of the barotropic energy pathway to EKE; the baroclinic pathway strengthens when the barotropic pathway weakens. In the subtropical gyre and Southern Ocean, a delay in energy transfer between different reservoirs occurs during baroclinic instability. The delay mechanism is identified using a quasigeostrophic, two-layer model; part of the potential energy in large-scale eddies, gained from the mean flow, cascades to smaller scales through eddy stirring before converting to EKE. The delay time is related to this forward cascade and scales linearly with the eddy turnover time. The relation between temporal variations in wind power input and eddy-mean flow interactions is also assessed.
机译：通过检查涡旋-均值流相互作用的时间变化，可以了解全球海洋能量循环及其与气候变化的关系。制定了随时间变化的洛伦兹能量图，并将其从全球涡流状态估算中应用于高能海洋区域。每个快照中的总能量分为三个部分：平均流量中的能量，涡流中的能量和时间瞬时均值为零的能量时间异常残差。这三个术语分别表示平均值之间的相关性，涡量之间的相关性和涡均值相关性。涡均流相互作用涉及这三个组成部分之间的能量交换。评估了涡-均流相互作用过程中能量交换的时间一致性。在黑潮和墨西哥湾流扩展区，抑制关系的表现是，随着通向EKE的正压能量路径的增强，通往斜波动能（EKE）储层的斜压能量路径减少了。当正压途径减弱时，斜压途径就会增强。在亚热带回旋区和南大洋，斜压不稳定过程中，不同储层之间的能量传递发生延迟。延迟机制是使用准地层两层模型来识别的。从平均流量中获得的大涡旋中的部分势能，在转化为EKE之前，通过涡旋搅拌级联成较小的尺度。延迟时间与此正向级联有关，并且与涡流转换时间成线性比例关系。还评估了风能输入的时间变化与涡流-均流相互作用之间的关系。

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  • 来源
    《Journal of Physical Oceanography》 |2016年第9期|2827-2850|共24页
  • 作者

    Chen Ru; Thompson Andrew F.; Flierl Glenn R.;

  • 作者单位

    Univ Calif San Diego, Scripps Inst Oceanog, 9500 Gilman Dr,Mail Code 0230, La Jolla, CA 92093 USA;

    CALTECH, Pasadena, CA 91125 USA;

    MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA;

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