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Potential vorticity dynamics of the arctic halocline

机译：北极卤素的潜在涡流动态

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An idealized two-layer shallow water model is applied to the study of the dynamics of the Arctic Ocean halocline. The model is forced by a surface stress distribution reflective of the observed wind stress pattern and ice motion and by an inflow representing the flow of Pacific Water through Bering Strait. The model reproduces the main elements of the halocline circulation: an anticyclonic Beaufort Gyre in the western basin (representing the Canada Basin), a cyclonic circulation in the eastern basin (representing the Eurasian Basin), and a Transpolar Drift between the two gyres directed from the upwind side of the basin to the downwind side of the basin. Analysis of the potential vorticity budget shows a basin-averaged balance primarily between potential vorticity input at the surface and dissipation at the lateral boundaries. However, advection is a leading-order term not only within the anticyclonic and cyclonic gyres but also between the gyres. This means that the eastern and western basins are dynamically connected through the advection of potential vorticity. Both eddy and mean fluxes play a role in connecting the regions of potential vorticity input at the surface with the opposite gyre and with the viscous boundary layers. These conclusions are based on a series of model runs in which forcing, topography, straits, and the Coriolis parameter were varied.
机译：一种理想化的双层浅水模型应用于北极海洋卤芯的动态研究。该模型由观察到的风力图案和冰运动反射的表面应力分布，以及通过堵塞海峡代表太平洋水流的流入。该模型再现Halocline循环的主要元素：西部盆地（代表加拿大盆地）的反气旋Beaufort Gyre，东部盆地的旋流（代表欧亚盆地），以及指导的两个陀螺之间的横向漂移盆地的向上侧面到盆地的下行侧。对潜在涡流预算的分析显示盆地平均平均平均平均平均平均平均平均平均平均平均平均平均平均平均平均平均在横向边界处的潜在涡流和耗散之间。然而，平流是一个不仅在反气旋和循环旋转内的领先阶段，而且是在旋转中。这意味着东部和西部盆地通过对潜在的涡流的平流动态地连接。涡流和平均助焊剂都在将表面的潜在涡度区域的区域与相对的纱线和粘性边界层连接起来。这些结论基于一系列模型运行，其中迫使地形，海峡和科里奥利参数变化。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2085-2085|共1页
  • 作者

    M. Spall;

  • 作者单位

    Woods Hole Oceanographic Institution Woods Hole Massachusetts United States;

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  • 正文语种 eng
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