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首页> 外文期刊>Journal of Physical Oceanography >Lagrangian Time Scales and Eddy Diffusivity at 1000 m Compared to the Surface in the South Pacific and Indian Oceans
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Lagrangian Time Scales and Eddy Diffusivity at 1000 m Compared to the Surface in the South Pacific and Indian Oceans

机译：与南太平洋和印度洋海面相比，拉格朗日时间尺度和1000 m处的涡流扩散率

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摘要

Argo floats cannot be regarded as true Lagrangian drifters because they periodically rise to the surface. Hence, previous estimates of eddy diffusivity at depth using single-particle statistics have been limited to one submerged cycle. However, unless the Lagrangian time scale is significantly shorter than the Argo cycle time, this single-particle calculation can have a large bias. Here, eddy diffusivity computed from single-particle statistics using Argo data is compared to that computed by assuming that Eulerian scales at depth are the same as at the surface, and that the relationship between Lagrangian and Eulerian time scales derived by Middleton is valid. If the methods provide the same answer, one can have confidence in both methods. Eddy diffusivity calculated from the single-particle statistics shows the same spatial structure as that computed from inferred time scale, but is smaller by a factor of about 2. It is suggested that this is because the deep Lagrangian time scale over much of the region is comparable to, or longer than, the 10-day Argo submergence cycle.
机译：Argo浮子不能被视为真正的拉格朗日漂流者，因为它们会定期上升到水面。因此，以前使用单颗粒统计数据对深部涡流扩散率的估计仅限于一个淹没循环。但是，除非拉格朗日时间标尺明显短于Argo循环时间，否则此单粒子计算可能会有较大偏差。在此，将使用Argo数据从单粒子统计数据中计算出的涡流扩散率与假设深度处的欧拉尺度与表面处的欧拉尺度相同，并且由Middleton推导的拉格朗日和欧拉时间尺度之间的关系是有效的，将涡流扩散率进行比较。如果这些方法提供相同的答案，则可以对两种方法都充满信心。根据单粒子统计数据计算得出的涡流扩散率显示的空间结构与根据推断时间尺度计算得出的空间结构相同，但减小了约2倍。这表明这是因为在该区域的大部分区域中，深拉格朗日时间尺度是与10天Argo浸没周期相当或更长。

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    《Journal of Physical Oceanography》 |2013年第12期|2718-2732|共15页
  • 作者

    Stephen M. Chiswell;

  • 作者单位

    National Institute of Water and Atmospheric Research, P.O. Box 14901,Wellington, New Zealand;

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