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首页> 外文期刊>Journal of Physical Oceanography >Objective Detection of Oceanic Eddies and the Agulhas Leakage
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Objective Detection of Oceanic Eddies and the Agulhas Leakage

机译：客观检测海洋涡流和积水泄漏

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摘要

Mesoscale oceanic eddies are routinely detected from instantaneous velocities derived from satellite al-timetry data. While simple to implement, this approach often gives spurious results and hides true material transport. Here it is shown how geodesic transport theory, a recently developed technique from nonlinear dynamical systems, uncovers eddies objectively. Applying this theory to altimetry-derived velocities in the South Atlantic reveals, for the first time, Agulhas rings that preserve their material coherence for several months, while ring candidates yielded by other approaches tend to disperse or leak within weeks. These findings suggest that available velocity-based estimates for the Agulhas leakage, as well as for its impact on ocean circulation and climate, need revision.
机译：中尺度海洋涡流通常是根据卫星测高数据得出的瞬时速度来检测的。尽管易于实施，但这种方法通常会产生虚假结果，并掩盖了真正的物料运输过程。这里显示了测地线输运理论是非线性动力学系统的最新技术，它是如何客观地发现涡流的。将该理论应用于南大西洋的高程速度，首次揭示了Agulhas环在数月内保持其物质一致性，而其他方法产生的环候选物则倾向于在数周内分散或泄漏。这些发现表明，需要对基于Agulhas泄漏及其对海洋环流和气候影响的基于速度的估计进行修订。

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  • 来源
    《Journal of Physical Oceanography》 |2013年第7期|1426-1438|共13页
  • 作者

    Francisco J. Beron-Vera; Yan Wang; Maria J. Olascoaga; Gustavo J. Goni; George Haller;

  • 作者单位

    Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida,RSMAS/AMP, University of Miami, 4600 Rickenbacker Cswy., Miami, FL 33149;

    Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida;

    Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida;

    National Oceanic and Atmospheric Administration/Atlantic Oceanographic and Meteorological Laboratory, Miami, Florida;

    Institute for Mechanical Systems, ETH Zuerich, Zurich, Switzerland;

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