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Eddy Trains and Striations in Quasigeostrophic Simulations and the Ocean

机译：准地转模拟和海洋中的涡流列车和条纹

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摘要

This study explores the relationship between coherent eddies and zonally elongated striations. The investigation involves an analysis of two baroclinic quasigeostrophic models of a zonal and double-gyre flow and a set of altimetry sea level anomaly data in the North Pacific. Striations are defined by either spatio-temporal filtering or empirical orthogonal functions (EOFs), with both approaches leading to consistent results. Coherent eddies, identified here by the modified Okubo-Weiss parameter, tend to propagate along well-defined paths, thus forming "eddy trains'' that coincide with striations. The striations and eddy trains tend to drift away from the intergyre boundary at the same speed in both the model and observations. The EOF analysis further confirms that these striations in model simulations and altimetry are not an artifact of temporal averaging of random, spatially uncorrelated vortices. This study suggests instead that eddies organize into eddy trains, which manifest themselves as striations in low-pass filtered data and EOF modes.
机译：这项研究探讨了相干涡与纬向细长条纹之间的关系。调查涉及对北太平洋纬向和双旋流的两个斜斜准地转模式和一组高程海平面异常数据的分析。条纹是通过时空滤波或经验正交函数（EOF）定义的，两种方法都可以得到一致的结果。通过修改的Okubo-Weiss参数在此处识别出相干涡，它们倾向于沿定义明确的路径传播，从而形成与条纹重合的“涡流列”。 EOF分析进一步证实，模型模拟和测高法中的这些条纹不是随机的，空间上不相关的涡旋在时间上平均化的产物，而是表明涡流组织成涡流列，表现为低通滤波数据和EOF模式下的条纹。

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  • 来源
    《Journal of Physical Oceanography》 |2016年第9期|2807-2825|共19页
  • 作者

    Chen Changheng; Kamenkovich Igor; Berloff Pavel;

  • 作者单位

    Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, 4600 Rickenbacker Causeway, Miami, FL 33149 USA|Univ Waterloo, Dept Syst Design Engn, 200 Univ Ave West, Waterloo, ON N2L 3G1, Canada;

    Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, 4600 Rickenbacker Causeway, Miami, FL 33149 USA;

    Imperial Coll London, Dept Math, London, England;

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