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Fluids 2017, 2(3), 45; doi:10.3390/fluids2030045

The Impact of Horizontal Resolution on Energy Transfers in Global Ocean Models

Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Oxford OX1 3PU, UK
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Received: 15 July 2017 / Revised: 15 August 2017 / Accepted: 24 August 2017 / Published: 28 August 2017
(This article belongs to the Collection Geophysical Fluid Dynamics)
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Abstract

The ocean is a turbulent fluid with processes acting on a variety of spatio-temporal scales. The estimates of energy fluxes between length scales allows us to understand how the mean flow is maintained as well as how mesoscale eddies are formed and dissipated. Here, we quantify the kinetic energy budget in a suite of realistic global ocean models, with varying horizontal resolution and horizontal viscosity. We show that eddy-permitting ocean models have weaker kinetic energy cascades than eddy-resolving models due to discrepancies in the effect of wind forcing, horizontal viscosity, potential to kinetic energy conversion, and nonlinear interactions on the kinetic energy (KE) budget. However, the change in eddy kinetic energy between the eddy-permitting and the eddy-resolving model is not enough to noticeably change the scale where the inverse cascade arrests or the Rhines scale. In addition, we show that the mechanism by which baroclinic flows organise into barotropic flows is weaker at lower resolution, resulting in a more baroclinic flow. Hence, the horizontal resolution impacts the vertical structure of the simulated flow. Our results suggest that the effect of mesoscale eddies can be parameterised by enhancing the potential to kinetic energy conversion, i.e., the horizontal pressure gradients, or enhancing the inverse cascade of kinetic energy. View Full-Text
Keywords: spectral flux; ocean model; kinetic energy; eddy parameterisation; nucleus for european modelling of the ocean (NEMO); horizontal resolution spectral flux; ocean model; kinetic energy; eddy parameterisation; nucleus for european modelling of the ocean (NEMO); horizontal resolution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kjellsson, J.; Zanna, L. The Impact of Horizontal Resolution on Energy Transfers in Global Ocean Models. Fluids 2017, 2, 45.

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