Modelling of partially-resolved oceanic symmetric instability
Modelling of partially-resolved oceanic symmetric instability
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DOI：
10.1016/j.ocemod.2014.07.006
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发表时间：
2014-10-01
期刊：
影响因子：
3.2
通讯作者：
Taylor, J. R.
中科院分区：
文献类型：
--
作者：
Bachman, S. D.;Taylor, J. R.
为了研究对称不稳定对海洋环流模式的影响，发展了一系列理想化的数值模式。对称不稳定的能量学的分析是用来争论的混合层可以至少部分restratified，即使当一些SI模式是不存在的，由于大的水平粘度或粗糙的模型分辨率。线性稳定性分析表明，在理想化的模型中的限制量可以预测的网格间距和粘度的函数。模型本身被用来证明这些预测，并揭示了三种可能的结果在稳态：（1）不完全restratification由于粘度，（2）不完全restratification由于分辨率，和（3）过度restratification由于各向异性的粘度。第三种结果甚至出现在高分辨率的各向同性网格和两个独立的数值模式中，因此似乎是一种稳健的数值特征。这三个结果被用来推荐一个成功的SI参数化应该满足的标准。(C)2014作者出版社：Elsevier Ltd
A series of idealized numerical models have been developed to investigate the effects of partially resolved symmetric instability (SI) in oceanic general circulation models. An analysis of the energetics of symmetric instability is used to argue that the mixed layer can be at least partially restratified even when some SI modes are absent due to either large horizontal viscosity or coarse model resolution. Linear stability analysis reveals that in the idealized models the amount of restratification can be predicted as a function of the grid spacing and viscosity. The models themselves are used to demonstrate these predictions and reveal three possible outcomes in steady-state: (1) incomplete restratification due to viscosity, (2) incomplete restratification due to resolution, and (3) excessive restratification due to anisotropy of the viscosity. The third outcome occurs even on a high-resolution isotropic grid and in two separate numerical models, and thus appears to be a sort of robust numerical feature. The three outcomes are used to recommend criteria that a successful SI parameterization should satisfy. (C) 2014 The Authors. Published by Elsevier Ltd.