Comparison of the effect of parameterized eddy fluxes of thickness and potential vorticity


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Sergey.Danilov [ at ] awi.de

Abstract

Parameterization of mesoscale eddies is an important problem of modern ocean dynamics and modelling. The most widely used scheme is the so called Gent–McWilliams parameterization, which describes the eddy-induced transport of tracers, including temperature, density and isopycnal thickness (TH). An alternative scheme, proposed by Green and Welander, deals with parameterizing eddy fluxes of potential vorticity (PV). Many recent studies propose using it, for it includes the effect of eddy Reynolds stresses which may influence mean flows. These two schemes are compared in the simplest configuration of two-layer quasigeostrophic channel flow, which enables analytical solutions for zonal-mean fields. It is shown how the parameterizations shape the zonally averaged zonal velocity profiles, with special attention paid to the role of the Reynolds stresses and momentum conservation. The zonally averaged zonal velocity profiles are sensitive to the amplitude and profiles of TH and PV diffusivities. For small enough diffusivities the TH parameterization may lead to solutions resembling those for the PV parameterization if it uses the diffusivity of the latter, i.e. it may mimic the impact of the Reynolds stresses on the mean flow.



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Scopus/ISI peer-reviewed
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Published
Eprint ID
36228
DOI 10.1175/JPO-D-13-0267.1

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Ivchenko, V. O. , Danilov, S. and Schröter, J. (2014): Comparison of the effect of parameterized eddy fluxes of thickness and potential vorticity , Journal of Physical Oceanography, 44 (9), pp. 2470-2484 . doi: 10.1175/JPO-D-13-0267.1


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