Parameterization of mixed layer eddies. Part II: Prognosis and impact
Parameterization of mixed layer eddies. Part II: Prognosis and impact
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DOI：
10.1175/2007jpo3788.1
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发表时间：
2008-06-01
影响因子：
3.5
通讯作者：
Ferrari, Raffaele
中科院分区：
文献类型：
--
作者：
Fox-Kemper, Baylor;Ferrari, Raffaele
作者提出了一个参数化的限制混合层涡，发展从斜压不稳定的海洋锋。参数化被铸造作为一个翻转流函数，是成比例的产品的水平浮力梯度，混合层深度，和惯性周期。参数化有显着的技能，一个非常广泛的混合层深度，旋转速率，垂直和水平分层。本文将一个粗分辨率的参数化预报模式与中尺度混合层涡度分辨模式进行了比较。参数化证明准确预测浮力的变化。建议的参数化的气候影响估计通过应用的restratification缩放观测：混合层深度估计从气候学，和浮力梯度是从卫星测高。的垂直通量是可比的月平均海气通量在大面积的海洋和混合层涡旋的限制是一个领先的顺序过程中的上层海洋。海洋-大气相互作用的关键区域，如深水、中层水和模态水形成地点，受到的影响尤其严重。
The authors propose a parameterization for restratification by mixed layer eddies that develop from baroclinic instabilities of ocean fronts. The parameterization is cast as an overturning streamfunction that is proportional to the product of horizontal buoyancy gradient, mixed layer depth, and inertial period. The parameterization has remarkable skill for an extremely wide range of mixed layer depths, rotation rates, and vertical and horizontal stratifications. In this paper a coarse resolution prognostic model of the parameterization is compared with submesoscale mixed layer eddy resolving simulations. The parameterization proves accurate in predicting changes to the buoyancy. The climate implications of the proposed parameterization are estimated by applying the restratification scaling to observations: the mixed layer depth is estimated from climatology, and the buoyancy gradients are from satellite altimetry. The vertical fluxes are comparable to monthly mean air-sea fluxes in large areas of the ocean and suggest that restratification by mixed layer eddies is a leading order process in the upper ocean. Critical regions for ocean-atmosphere interaction, such as deep, intermediate, and mode water formation sites, are particularly affected.