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首页> 外文期刊>Journal of Physical Oceanography >The Interaction of Recirculation Gyres and a Deep Boundary Current
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The Interaction of Recirculation Gyres and a Deep Boundary Current

机译：回流环与深边界流的相互作用

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Motivated by the proximity of the Northern Recirculation Gyre and the deep western boundary current in the North Atlantic, an idealized model is used to investigate how recirculation gyres and a deep flow along a topographic slope interact. In this two-layer quasigeostrophic model, an unstable jet imposed in the upper layer generates barotropic recirculation gyres. These are maintained by an eddy-mean balance of potential vorticity (PV) in steady state. The authors show that the topographic slope can constrain the northern recirculation gyre meridionally and that the gyre's adjustment to the slope leads to increased eddy PV fluxes at the base of the slope. When a deep current is present along the topographic slope in the lower layer, these eddy PV fluxes stir the deep current and recirculation gyre waters. Increased proximity to the slope dampens the eddy growth rate within the unstable jet, altering the geometry of recirculation gyre forcing and leading to a decrease in overall eddy PV fluxes. These mechanisms may shape the circulation in the western North Atlantic, with potential feedbacks on the climate system.
机译：受北部回流环流和北大西洋深部西部边界流的影响，采用理想化模型研究回流环流和沿地形坡度的深流如何相互作用。在此两层准地转模型中，施加在上层的不稳定射流会产生正压循环回旋。这些由稳态下的潜在涡度（PV）的涡旋均值保持。这组作者表明，地形坡度可以在子午方向上约束北部的再循环回旋，并且回旋对坡的调整会导致坡底的涡流PV通量增加。当在下层的地形坡度上存在深水流时，这些涡流PV通量会搅动深水流和回旋水。靠近坡度的增加会抑制不稳定射流中的涡流增长率，从而改变再循环回旋强迫的几何形状，并导致整体涡流PV通量减少。这些机制可能会影响北大西洋西部的环流，并可能对气候系统产生反馈。

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