A Diagnosis of Anisotropic Eddy Diffusion From a High‐Resolution Global Ocean Model
A Diagnosis of Anisotropic Eddy Diffusion From a High‐Resolution Global Ocean Model
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DOI：
10.1029/2019ms001904
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发表时间：
2020-01
影响因子：
6.8
通讯作者：
S. Bachman;B. Fox‐Kemper;F. Bryan
中科院分区：
文献类型：
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作者：
S. Bachman;B. Fox‐Kemper;F. Bryan
众所周知，海洋中尺度涡旋会扩散和搅动示踪物，而从涡旋解析模式统计对这些过程的准确诊断对熟练涡旋闭合的发展有相当大的帮助。本文将多示踪反演方法应用于全球中尺度涡旋数值模拟，目的是求解描述涡旋扩散(对称部分)和搅动(反对称部分)的涡旋传输张量。特别强调诊断水平输运的各向异性，它由2×2水平对称亚张量的本征值和特征向量描述。这些量的全局诊断以及对其垂直结构的检查被用来推荐一种算法，用于扩展Gent和McWilliams和Redi参数以包括各向异性效应。
Oceanic mesoscale eddies are known to diffuse and stir tracers, and the development of skillful eddy closures is aided considerably by the accurate diagnosis of these processes from eddy‐resolving model statistics. In this work a multiple‐tracers inversion method is applied to a global mesoscale eddy‐resolving simulation, with the intent to solve for the eddy transport tensor that describes the eddy diffusion (symmetric part) and stirring (antisymmetric part). Special emphasis is placed on diagnosing the anisotropy of the horizontal transport, which is described by the eigenvalues and eigenvectors of the 2×2 horizontal symmetric subtensor. Global diagnoses of these quantities, along with an examination of their vertical structures, are used to recommend an algorithm for extending the Gent and McWilliams and Redi parameterizations to include anisotropic effects.