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On the Dynamics of Flows Induced by Topographic Ridges

机译：地形脊诱发的水流动力学

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摘要

This study describes a nonlocal mechanism for the generation of oceanic alternating jets by topographic ridges. The dynamics of these jets is examined using a baroclinic quasigeostrophic model configured with an isolated meridional ridge. The zonal topographic slopes of the ridge lead to the formation of a system of currents, consisting of mesoscale eddies, meridional currents over the ridge, and multiple zonal jets in the far field. Dynamical analysis shows that transient eddies are vital in sustaining the deep meridional currents over the ridge, which in turn play a key role in the upper-layer potential vorticity (PV) balance. The zonal jets in the rest of the domain owe their existence to the eddy forcing over the ridge but are maintained by the local Reynolds and form stress eddy forcing. The analysis further shows that a broad stable current that either becomes locally nonzonal or encounters a topographic ridge tends to become unstable. This instability provides a vorticity source and generates multiple zonal jets in the far field through a nonlocal mechanism.
机译：这项研究描述了一种由地形脊产生海洋交替喷流的非局部机制。使用配置有孤立子午脊的斜斜准地转模型检查这些射流的动力学。脊的纬向地形坡度导致形成一个由中尺度涡流，脊上的子午流和远场中的多个纬向射流组成的洋流系统。动力学分析表明，瞬变涡流对于维持山脊上的深子午流至关重要，而这反过来又对上层势涡（PV）平衡起着关键作用。其余区域中的纬向射流的存在归因于对山脊的涡旋强迫，但由当地的雷诺兹维持并形成应力涡旋强迫。分析还表明，要么变成局部非区域性的，要么遇到地形脊的宽范围的稳定电流趋于变得不稳定。这种不稳定性提供了涡旋源，并通过非局部机制在远场中产生了多个纬向射流。

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  • 来源
    《Journal of Physical Oceanography》 |2015年第3期|927-940|共14页
  • 作者

    Chen Changheng; Kamenkovich Igor; Berloff Pavel;

  • 作者单位

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

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

    Univ London Imperial Coll Sci Technol & Med, Dept Math, London, England;

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