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Evaluating Different Parameterizations for Mixed Layer Eddy Fluxes induced by Baroclinic Instability

机译:评估斜压不稳定引起的混合层涡流的不同参数化

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In this study, the authors discuss two different parameterizations for the effect of mixed layer eddies, one based on ageostrophic linear stability analysis (ALS) and the other one based on a scaling of the potential energy release by eddies (PER). Both parameterizations contradict each other in two aspects. First, they predict different functional relationships between the magnitude of the eddy fluxes and the Richardson number (Ri) related to the background state. Second, they also predict different vertical structure functions for the horizontal eddy fluxes. Numerical simulations for two different configurations and for a large range of different background conditions are used to evaluate the parameterizations. It turns out that PER is better suited to capture the Ri dependency of the magnitude of the eddy fluxes. On the other hand, the vertical structure of the meridional eddy fluxes predicted by ALS is more accurate than that of PER, while the vertical structure of the vertical eddy fluxes is well predicted by both parameterizations. Therefore, this study suggests the use of the magnitude of PER and the vertical structure functions of ALS for an improved parameterization of mixed layer eddy fluxes.
机译:在这项研究中,作者讨论了混合层涡流效应的两种不同的参数化,一种基于年龄营养线性稳定性分析(ALS),另一种基于涡旋势能释放的比例(PER)。这两个参数化在两个方面相互矛盾。首先,他们预测了涡通量的大小和与背景状态有关的理查森数(Ri)之间的不同功能关系。其次,他们还预测了水平涡流的不同垂直结构函数。使用两种不同配置以及大量不同背景条件的数值模拟来评估参数设置。事实证明,PER更适合捕获涡流通量大小的Ri依赖性。另一方面,由ALS预测的子午涡流的垂直结构比PER更为精确,而通过两个参数化都可以很好地预测子午涡流的垂直结构。因此,这项研究建议使用PER的大小和ALS的垂直结构函数来改善混合层涡流的参数化。

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