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Stochastic subgrid parameterizations for atmospheric and oceanic flows

Citation

Frederiksen, JS and O'Kane, TJ and Zidikheri, MJ, Stochastic subgrid parameterizations for atmospheric and oceanic flows, Physica Scripta, 85, (6) Article 068202. ISSN 0031-8949 (2012) [Refereed Article]

Copyright Statement

2012 The Royal Swedish Academy of Sciences

DOI: doi:10.1088/0031-8949/85/06/068202

Abstract

In this paper, we review recently developed closure-based and stochastic model approaches to subgrid scale modelling of eddy interactions motivated by advances in non-equilibrium statistical dynamical closure theory. We demonstrate how statistical dynamical closure models can be used to self-consistently calculate eddy damping and stochastic backscatter parameters, required in large eddy simulations (LESs), from higher-resolution simulations. A direct stochastic modelling scheme that is more generally applicable to complex models is then described and applied to LESs of quasigeostrophic turbulence of the atmosphere and oceans. We discuss the fundamental difference between atmospheric and oceanic LESs which is related to the difference in the deformation scales in the two classes of flows. We point out why the stochastic approach may be crucial when baroclinic instability is inadequately resolved. Finally, we discuss the application of inhomogeneous closure theory to the complex problem of flow over topography, and show that it can be used to understand the successes and limitations of currently used heuristic schemes and to provide a basis for further developments in the future.

Item Details

Item Type:Refereed Article
Keywords:computer simulation, stochastic systems
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Marine Oceanic Processes (excl. climate related)
Author:O'Kane, TJ (Dr Terry O'Kane)
ID Code:119749
Year Published:2012
Web of Science® Times Cited:7
Deposited By:Centre for Oceans and Cryosphere
Deposited On:2017-08-04
Last Modified:2017-09-27
Downloads:0

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