On the Separation of a Barotropic Western Boundary Current from a Cape
On the Separation of a Barotropic Western Boundary Current from a Cape
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正压西边界流与海角的分离
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
D. Marshall
中科院分区：
文献类型：
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作者：
D. Munday;D. Marshall
本文用正压涡度模式研究了西边界气流分离问题。具体地说，边界电流流向极沿着边界包含海角被认为是。科里奥利参数的角向梯度（β效应）、耗散的强度和角的几何形状是变化的。结果表明：（1）所有的流动分离都与流动减速的存在相一致;（2）β效应强度的增加能够抑制流动分离;（3）增加海岸线曲率能够克服抑制性β效应并诱导分离。这些结果得到了积分涡度收支的支持，积分涡度收支将边界流的加速归因于β效应和流动曲率的变化。过渡到非定常最终模型状态被发现对这些结论的定性性质没有影响。
Abstract The problem of western boundary current separation is investigated using a barotropic vorticity model. Specifically, a boundary current flowing poleward along a boundary containing a cape is considered. The meridional gradient of the Coriolis parameter (the β effect), the strength of dissipation, and the geometry of the cape are varied. It is found that 1) all instances of flow separation are coincident with the presence of a flow deceleration, 2) an increase in the strength of the β effect is able to suppress flow separation, and 3) increasing coastline curvature can overcome the suppressive β effect and induce separation. These results are supported by integrated vorticity budgets, which attribute the acceleration of the boundary current to the β effect and changes in flow curvature. The transition to unsteady final model states is found to have no effect upon the qualitative nature of these conclusions.