Integral constraints for momentum and energy in zonal flows with parameterised potential vorticity fluxes: governing parameters


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Sergey.Danilov [ at ] awi.de

Abstract

Integral constraints for momentum and energy impose restrictions on parameterizations of eddy potential vorticity (PV) fluxes. The impact of these constraints is studied for a wind forced quasigeostrophic two-layer zonal channel model with variable bottom topography. The presence of a small parameter, given by the ratio of Rossby radius to the width of the channel, allows us to find an analytical/asymptotic solution for the zonally and time averaged flow, given diffusive parameterizations for the eddy PV fluxes. This solution, when substituted in the constraints, leads to non-trivial explicit restrictions on diffusivities. The system is characterized by four dimensionless governing parameters with a clear physical interpretation. The bottom form stress, the major term balancing the external force of wind stress, depends on the governing parameters and fundamentally modifies the restrictions compared to the flat-bottom case. While the analytical solution bears an illustrative char- acter, it helps to see certain non-trivial connections in the system which will be useful in the analysis of more complicated models of ocean circulation. A numerical solution supports the analytical study and confirms that the presence of topography strongly modifies the eddy fluxes.



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Scopus/ISI peer-reviewed
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Eprint ID
35077
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Ivchenko, V. , Danilov, S. , Sinha, B. and Schröter, J. (2014): Integral constraints for momentum and energy in zonal flows with parameterised potential vorticity fluxes: governing parameters , Journal of Physical Oceanography, 44 , pp. 922-943 .


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