Eddy-Driven Buoyancy Gradients on Eastern Boundaries and Their Role in the Thermocline
Eddy-Driven Buoyancy Gradients on Eastern Boundaries and Their Role in the Thermocline
复制标题
东部边界上的涡驱动浮力梯度及其在温跃层中的作用
DOI：
10.1175/2009jpo4063.1
复制
发表时间：
2009
影响因子：
3.5
通讯作者：
C. Wolfe
中科院分区：
文献类型：
--
作者：
P. Cessi;C. Wolfe
摘要本文论证了东西边界的浮力涡动通量维持着沿沿着的浮力梯度。涡通量出现在东西边界附近，因为在两个海岸上，垂直于边界的浮力梯度很强。涡动通量伴随着平均垂直流动，发生在狭窄的边界层旁边的海岸的地转约束被打破。这些非地转环流有一个垂直于海岸的速度分量，它与地转平均速度相平衡。结果表明，在这些薄的非地转边界层中的动态可以被替换为有效的边界条件的内部流动，有关的浮力在边界层的向海边缘的浮力梯度沿着海岸的涡动通量。这些有效的边界条件被施加到一个模型的温跃层线性化周围的平均分层和静止状态。线性模型参数化了浮标的涡动通量。
Abstract It is demonstrated that eddy fluxes of buoyancy at the eastern and western boundaries maintain alongshore buoyancy gradients along the coast. Eddy fluxes arise near the eastern and western boundaries because on both coasts buoyancy gradients normal to the boundary are strong. The eddy fluxes are accompanied by mean vertical flows that take place in narrow boundary layers next to the coast where the geostrophic constraint is broken. These ageostrophic cells have a velocity component normal to the coast that balances the geostrophic mean velocity. It is shown that the dynamics in these thin ageostrophic boundary layers can be replaced by effective boundary conditions for the interior flow, relating the eddy flux of buoyancy at the seaward edge of the boundary layers to the buoyancy gradient along the coast. These effective boundary conditions are applied to a model of the thermocline linearized around a mean stratification and a state of rest. The linear model parameterizes the eddy fluxes of buoya...