A note on 'Toward a stochastic parameterization of ocean mesoscale eddies'
A note on 'Toward a stochastic parameterization of ocean mesoscale eddies'
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关于“海洋中尺度涡旋的随机参数化”的注释
DOI：
10.1016/j.ocemod.2017.03.007
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发表时间：
2017
期刊：
影响因子：
3.2
通讯作者：
Grooms I
中科院分区：
文献类型：
--
作者：
Grooms I
Porta Mana和Zanna(2014)最近提出了一种亚网格尺度的准地转涡旋模式的参数化方法。在该模型中，大尺度流体被表示为非牛顿粘弹性介质，具有涉及大尺度量的拉格朗日导数的次网格应力闭合。本说明仅使用两个统计假设推导了包括无因次比例系数在内的参数化项：次网格尺度项是局部齐次的，并且在空间上迅速去相关。然后，通过与涡旋分辨准地转模拟进行比较，在更简单的模式中独立地再现Porta Mana和Zanna的结果，验证了该参数化。
Porta Mana and Zanna (2014) recently proposed a subgrid-scale parameterization for eddy-permitting quasigeostrophic models. In this model the large-scale fluid is represented as a non-Newtonian viscoelastic medium, with a subgrid-stress closure that involves the Lagrangian derivative of large-scale quantities. This note derives this parameterization, including the nondimensional proportionality coefficient, using only two statistical assumptions: that the subgrid-scale term is locally homogeneous and decorrelates rapidly in space. The parameterization is then verified by comparing against eddy-resolving quasigeostrophic simulations, independently reproducing the results of Porta Mana and Zanna in a simpler model.