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Turbulent mixing of a passive scalar in the ocean mixed layer
Ocean Modelling ( IF 3.2 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.ocemod.2020.101615 Neeraja Bhamidipati , Andre N. Souza , Glenn R. Flierl
Ocean Modelling ( IF 3.2 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.ocemod.2020.101615 Neeraja Bhamidipati , Andre N. Souza , Glenn R. Flierl
Abstract We study the 2D turbulent mixing of a passive scalar in the ocean mixed layer. As an example, we examine a steady-state convective mixed layer in which the boundary conditions are chosen so that the system reaches a dynamical equilibrium. In this idealized case, we parameterize the horizontally and temporally averaged fluxes as a functional of the horizontally and temporally averaged property gradients. Here, 〈 w ′ c ′ 〉 = − ∫ d z ′ K ( z | z ′ ) ∂ 〈 c 〉 ∕ ∂ z ′ , where K ( z | z ′ ) is the eddy diffusivity kernel which describes the vertical transport by eddies at any vertical location z . The full kernel K ( z | z ′ ) is computed by adding passive scalars to a buoyancy-driven flow field in a 2D DNS of the ocean surface layer. This functional form of the eddy diffusivity highlights both local and non-local effects of the mixing of a passive scalar, and is based on an unapproximated representation of the idealized physics. This type of formulation can be further extended to other problems in turbulence concerning the mixing of a passive scalar to determine a parameterization based on an accurate representation of ocean physics.
中文翻译:
海洋混合层中被动标量的湍流混合
摘要 我们研究了海洋混合层中被动标量的二维湍流混合。作为一个例子,我们研究了一个稳态对流混合层,其中选择了边界条件,以便系统达到动态平衡。在这种理想化的情况下,我们将水平和时间平均的通量参数化为水平和时间平均的属性梯度的函数。这里, 〈 w ′ c ′ 〉 = − ∫ dz ′ K ( z | z ′ ) ∂ 〈 c 〉 ∕ ∂ z ′ ,其中 K ( z | z ′ ) 是涡扩散核,它描述了在任何垂直位置 z 。完整的内核 K ( z | z ' ) 是通过将被动标量添加到海洋表面层 2D DNS 中的浮力驱动流场来计算的。涡扩散系数的这种函数形式突出了被动标量混合的局部和非局部效应,并且基于理想化物理的非近似表示。这种类型的公式可以进一步扩展到与被动标量混合有关的湍流中的其他问题,以确定基于海洋物理的准确表示的参数化。
更新日期:2020-05-01
中文翻译:
海洋混合层中被动标量的湍流混合
摘要 我们研究了海洋混合层中被动标量的二维湍流混合。作为一个例子,我们研究了一个稳态对流混合层,其中选择了边界条件,以便系统达到动态平衡。在这种理想化的情况下,我们将水平和时间平均的通量参数化为水平和时间平均的属性梯度的函数。这里, 〈 w ′ c ′ 〉 = − ∫ dz ′ K ( z | z ′ ) ∂ 〈 c 〉 ∕ ∂ z ′ ,其中 K ( z | z ′ ) 是涡扩散核,它描述了在任何垂直位置 z 。完整的内核 K ( z | z ' ) 是通过将被动标量添加到海洋表面层 2D DNS 中的浮力驱动流场来计算的。涡扩散系数的这种函数形式突出了被动标量混合的局部和非局部效应,并且基于理想化物理的非近似表示。这种类型的公式可以进一步扩展到与被动标量混合有关的湍流中的其他问题,以确定基于海洋物理的准确表示的参数化。