On eddy transport in the ocean. Part I: The diffusion tensor

نویسندگان

چکیده

This study provides an interpretation of isopycnal eddy transport for mass and passive tracers in double-gyre eddy-resolving oceanic circulation. paper focuses on a transport/diffusion tensor representation the tracer flux, companion will focus advective eddy-induced transports. We use spatial filter to separate large small scales, which leads results distinct from those obtained via temporal Reynolds decomposition. To work towards parameterisation, we relate flux large-scale gradient K. The symmetric part K is diffusion tensor, S, parameterises diffusive fluxes whose mixing properties are determined by signs its eigenvalues. eigenvalues S robustly opposite sign (polar) thus quantify filamentation both up- down-gradient fluxes. Given prevalence polar – also representing their associated effects should be target future closures. inherent inhomogeneity anisotropy transport, argue that full better suited this task than scalar coefficients or diagonal tensors. axis, represents direction preferential mixing, tends align with velocity vector contours relative vorticity layer thickness. Strong shears can inhibit alignment. show matrix may suitable parameterising particular at depth. Furthermore, since entries exhibit probabilistic distributions when conditioned certain flow features, suggest stochastic closure would most suitable.

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ژورنال

عنوان ژورنال: Ocean Modelling

سال: 2021

ISSN: ['1463-5003', '1463-5011']

DOI: https://doi.org/10.1016/j.ocemod.2021.101831