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Energy Transfers in Atmosphere and OceanToward Consistent Subgrid Momentum Closures in Ocean Models

Energy Transfers in Atmosphere and Ocean: Toward Consistent Subgrid Momentum Closures in Ocean... [State-of-the-art global ocean circulation models used in climate studies are only passing the edge of becoming “eddy-permitting” or barely eddy-resolving. Such models commonly suffer from overdissipation of mesoscale eddies by routinely used subgrid dissipation (viscosity) operators and a resulting depletion of energy in the large-scale structures which are crucial for draining available potential energy into kinetic energy. More broadly, subgrid momentum closures may lead to both overdissipation or pileup of eddy kinetic energy and enstrophy of the smallest resolvable scales. The aim of this chapter is twofold. First, it reviews the theory of two-dimensional and geostrophic turbulence. To a large part, this is textbook material with particular emphasis, however, on issues relevant to modeling the global ocean in the eddy-permitting regime. Second, we discuss several recent parameterizations of subgrid dynamics, including simplified backscatter schemes by Jansen and Held, stochastic superparameterizations by Grooms and Majda, and an empirical backscatter scheme by Mana and Zanna.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Energy Transfers in Atmosphere and OceanToward Consistent Subgrid Momentum Closures in Ocean Models

Part of the Mathematics of Planet Earth Book Series (volume 1)
Editors: Eden, Carsten; Iske, Armin
Danilov, Sergey; Juricke, Stephan; Kutsenko, Anton; Oliver, Marcel
Energy Transfers in Atmosphere and Ocean — Jan 24, 2019
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References (120)

Publisher
Springer International Publishing
Copyright
© Springer Nature Switzerland AG 2019
ISBN
978-3-030-05703-9
Pages
145 –192
DOI
10.1007/978-3-030-05704-6_5
Publisher site
See Chapter on Publisher Site

Abstract

[State-of-the-art global ocean circulation models used in climate studies are only passing the edge of becoming “eddy-permitting” or barely eddy-resolving. Such models commonly suffer from overdissipation of mesoscale eddies by routinely used subgrid dissipation (viscosity) operators and a resulting depletion of energy in the large-scale structures which are crucial for draining available potential energy into kinetic energy. More broadly, subgrid momentum closures may lead to both overdissipation or pileup of eddy kinetic energy and enstrophy of the smallest resolvable scales. The aim of this chapter is twofold. First, it reviews the theory of two-dimensional and geostrophic turbulence. To a large part, this is textbook material with particular emphasis, however, on issues relevant to modeling the global ocean in the eddy-permitting regime. Second, we discuss several recent parameterizations of subgrid dynamics, including simplified backscatter schemes by Jansen and Held, stochastic superparameterizations by Grooms and Majda, and an empirical backscatter scheme by Mana and Zanna.]

Published: Jan 24, 2019

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