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A new shear-driven mixing parameterization for layered ocean models
Robert Hallberg, Laura Jackson
NOAA/GFDL and Princeton University
(Abstract received 07/13/2007 for session X)
ABSTRACT
A new parameterization of stratified shear-driven mixing that is appropriate for use in large-scale layered ocean models will be described. This parameterization uses two equilibrium equations, for the diapycnal diffusivity and turbulent kinetic energy, that are simple enough to be implemented implicitly, enabling the use of a timestep that is long compared with both the evolution of the turbulence and the timescales on which the turbulence modifies the ambient flow and density structure. This parameterization has been implemented in GFDL\'s GOLD ocean model, and used in 1-degree resolution coupled simulations. In these simulations, the new parameterization gives reasonable results for the three regions where stratified shear mixing is particularly important - the Equatorial Undercurrent, entraining gravity currents, and at the base of the surface mixed layer.
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2007 LOM Workshop, Bergen, Norway, August 20-22, 2007