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- W4322211359 abstract "Parametrizing physical processes in the ocean is a universal approach to overcome resolution limitations across different scales. Parametrizations represent the mean effect of processes occurring on the scales less than the grid scale (i.e. on the subgrid) on the resolved mean flow through parametric equations. In this work, a viscous momentum closure, equipped with a backscatter operator that returns excessively dissipated energy back to the system, is used to parametrize mesoscale range processes on eddy-permitting mesh resolutions.The part of the variability that is not represented by the deterministic backscatter operator is modelled stochastically. We propose a stochastic field component, based on the patterns of variability extracted from the output of model simulations with different grid resolutions.As a continuation of this work, we propose an interaction of the backscatter parametrization with the Gent-McWilliams parametrization which is generally applied for coarser grids corresponding to non-eddy resolving resolutions. This connection is relevant to link kinetic and potential energy backscatter.The implementations are tested on two intermediate complexity setups of the global ocean model FESOM2: a doubly-periodic channel and a double-gyre box model. In this contribution, we present an increase of eddy activity and show that a greater complexity of setup enhances response to the implementation.  Keywords: mesoscale eddies, parametrization, backscatter, stochastic parametrization, GM parametrization." @default.
- W4322211359 created "2023-02-27" @default.
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- W4322211359 date "2023-05-15" @default.
- W4322211359 modified "2023-10-02" @default.
- W4322211359 title "Towards a subgrid momentum closure via stochastic backscatter and its linkages with the Gent-McWilliams parametrization" @default.
- W4322211359 doi "https://doi.org/10.5194/egusphere-egu23-15627" @default.
- W4322211359 hasPublicationYear "2023" @default.
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