An Eddy Parameterization Based on Maximum Entropy Production with Application to Modeling of the Arctic Ocean Circulation

Abstract

An eddy parameterization derived from statistical mechanics of potential vorticity is applied for inviscid shallow-water equations. The solution of a variational problem based on the maximum entropy production (MEP) principle provides, with some physical constraints, several viscous terms. Along with the traditional Laplacian operator, MEP parameterization includes the ?Neptune effect,? which is similar to that described by Holloway. The Neptune effect describes the interaction of eddies with seafloor topography. MEP parameterization is then incorporated into a high-resolution tidal model of the Arctic Ocean. MEP viscosity does not substantially affect the distribution of amplitudes, phases, and tidal currents; however, residual tidal circulation is sensitive to employed parameterization in areas of maximum bottom slope. The Neptune effect is the main contributor among other viscosities. The combined effect of the new viscous terms and nonlinear terms results in cyclonic residual tidal circulation. The MEP viscosity is also used in a coarse, 55.56-km-resolution Arctic Ocean general circulation model. The model produces cyclonic subsurface circulation in major arctic basins. This pattern is supported by observational studies. The model maintains the proper level of water transport through narrow (relative to the model resolution) Fram Strait, conserving the heat content in the Arctic interior.