Influences of Mesoscale Ocean Eddies on Flow Vertical Structure in a Resolution‐Based Model Hierarchy
Influences of Mesoscale Ocean Eddies on Flow Vertical Structure in a Resolution‐Based Model Hierarchy
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基于分辨率的模型层次结构中中尺度海洋涡流对流动垂直结构的影响
DOI：
10.1029/2022ms003203
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发表时间：
2022
影响因子：
6.8
通讯作者：
Smith, K. Shafer
中科院分区：
文献类型：
--
作者：
Yankovsky, Elizabeth;Zanna, Laure;Smith, K. Shafer
理解和表达与海洋中尺度涡旋有关的能量传递是气候模式参数化发展的基础。我们研究了涡旋对流动垂直结构的影响，它是基本动力机制和网格分辨率的函数。我们将GFDL-MOM6应用于理想构型，系统地考虑了四种水平分辨率：1/4°、1/8°、1/16°和1/32°。我们分析了势能和动能的分布，分解为正压和斜压，涡动和平均部分。随着分辨率的提高和斜压不稳定模式的更好捕捉，动能增加，势能减少。垂直结构的主要趋势是，随着涡旋的日益分解，越来越多的动能进入正压模式，特别是其涡旋成分。我们将低分辨率下斜压性的增加归因于对垂直能量通量的不准确描述，导致了高垂直模式下正压作用和能量捕获的抑制。我们还探讨了潜在的动力机制如何影响能量路径。在大尺度流动以正压为主的情况下，求解变形半径对于准确捕捉流动的垂直结构不那么重要。我们发现正压动能分数是评估垂直结构的一个有用的度量。在最高分辨率情况下，正压动能分数与形变尺度和含能尺度之间的尺度分离相关，即涡动逆级联的程度。这项工作表明，中尺度涡旋参数化应该以一种尺度感知的、物理上知情的方式将涡旋对垂直结构的能量效应包括在内。
The understanding and representation of energetic transfers associated with ocean mesoscale eddies is fundamental to the development of parameterizations for climate models. We investigate the influence of eddies on flow vertical structure as a function of underlying dynamical regime and grid resolution. We employ the GFDL‐MOM6 in an idealized configuration and systematically consider four horizontal resolutions: 1/4°, 1/8°, 1/16°, and 1/32°. We analyze the distributions of potential and kinetic energy, decomposed into barotropic and baroclinic, and eddy and mean parts. As resolution increases and baroclinically unstable modes are better captured, kinetic energy increases and potential energy decreases. The dominant trend in vertical structure is an increasing fraction of kinetic energy going into the barotropic mode, particularly its eddy component, as eddies are increasingly resolved. We attribute the increased baroclinicity at low resolutions to inaccurate representation of vertical energy fluxes, leading to suppressed barotropization and energy trapping in high vertical modes. We also explore how the underlying dynamical regime influences energetic pathways. In cases where large‐scale flow is dominantly barotropic, resolving the deformation radius is less crucial to accurately capturing the flow's vertical structure. We find the barotropic kinetic energy fraction to be a useful metric in assessing vertical structure. In the highest‐resolution case, the barotropic kinetic energy fraction correlates with the scale separation between the deformation scale and the energy‐containing scale, that is, the extent of the eddy‐driven inverse cascade. This work suggests that mesoscale eddy parameterizations should incorporate the energetic effects of eddies on vertical structure in a scale‐aware, physically informed manner.
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