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首页> 外文期刊>Journal of Physical Oceanography >Eulerian and Lagrangian Isopycnal Eddy Diffusivities in the Southern Ocean of an Eddying Model
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Eulerian and Lagrangian Isopycnal Eddy Diffusivities in the Southern Ocean of an Eddying Model

机译：涡旋模型在南大洋的欧拉和拉格朗日等渗涡度扩散

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摘要

Lagrangian isopycnal diffusivities quantify the along-isopycnal mixing of any tracer with mean gradients along isopycnal surfaces. They are studied in the Southern Ocean of the 1/10° Parallel Ocean Program (POP) model using more than 50000 float trajectories. Concurrent Eulerian isopycnal diffusivities are estimated directly from the eddy fluxes and mean tracer gradients. Consistency, spatial variation, and relation to mean jets are evaluated. The diffusivities are calculated in bins large enough to reduce contributions from the rotational components that do not lead to net tracer mixing. Because the mean jets are nonzonal and non-parallel, meridional dispersion includes standing eddies and is significantly different from cross-stream dispersion. With the subtraction of the local Eulerian mean, the full Lagrangian diffusivity tensor can be estimated. Along-stream diffusivities are about 6 times larger than cross-stream diffusivities. Along-streamline averages of Eulerian and Lagrangian isopycnal diffusivities are similar in that they are larger north of the Antarctic Circumpolar Current (ACC) and smaller in the ACC in the upper 500 m. Eulerian diffusivities are often twice as large as the Lagrangian diffusivities below 500 m. There is large longitudinal variability in the diffusivities and in their relation to the mean flow. In bins with one prominent jet, diffusivities are reduced at the surface in the jet and increased to the north and south of the jet. There is a local maximum at depths of 500-1000 m. In other bins where mean jets merge and diverge because of topography, there is no consistent relation of the diffusivities with the mean flow. Eulerian fluxes are upgradient in about 15% of the bins.
机译：拉格朗日等渗扩散率可量化任何示踪剂沿等渗混合，并沿等渗表面具有平均梯度。在1/10°平行海洋计划（POP）模型的南大洋中，使用了50000多条漂浮轨迹对它们进行了研究。直接从涡流和平均示踪剂梯度估算并发欧拉等渗扩散率。评估一致性，空间变化以及与平均射流的关系。扩散率以足够大的分格计算，以减少来自旋转分量的贡献，这些分量不会导致净示踪剂混合。由于平均射流是非区域性和非平行性的，因此子午线色散包括涡流，并且与横流色散明显不同。减去当地的欧拉平均值，就可以估算出整个拉格朗日扩散张量。沿流扩散率大约是跨流扩散率的6倍。沿流线方向的欧拉和拉格朗日等渗扩散率平均值相似，因为它们在南极绕极洋流（ACC）的北部较大，而在上游500 m的ACC较小。欧拉扩散率通常是500 m以下拉格朗日扩散率的两倍。扩散率及其与平均流量的关系存在较大的纵向变化。在具有一个突出喷射流的垃圾箱中，扩散率在喷射流的表面处减小，并向喷射流的北部和南部增大。在500-1000 m的深度处存在局部最大值。在其他由于地形而平均射流合并和发散的区域中，扩散率与平均流量之间没有一致的关系。欧拉通量在大约15％的垃圾箱中升级。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第2期|644-661|共18页
  • 作者

    A. Griesel; J. L. McClean; S. T. Gille; J. Sprintall; C. Eden;

  • 作者单位

    KlimaCampus, University of Hamburg, Bundesstrasse 53,20146 Hamburg, Germany;

    Scripps Institution of Oceanography, University of California, San Diego, San Diego, California;

    Scripps Institution of Oceanography, University of California, San Diego, San Diego, California;

    KlimaCampus, University of Hamburg, Bundesstrasse 53,20146 Hamburg, Germany;

    KlimaCampus, University of Hamburg, Hamburg, Germany;

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