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Energy-Consistent Interpolation for the Los Alamos Hybrid Ocean Model HYPOP
John Dukowicz
COSIM, Los Alamos National Laboratory
(Abstract received 07/19/2007 for session X)
ABSTRACT
HYPOP is a novel hybrid ocean model in development that performs momentum equation calculations on an Eulerian (z-coordinate) grid and tracer and continuity equation calculations on a Lagrangian (isopycnal) grid. This method is expected to enjoy the usual benefits of a hybrid approach, namely, avoiding of the disadvantages while retaining the advantages of the respective grids. The core of the method is an energy-consistent interpolation scheme that interpolates pressures from the Lagrangian side for use in the momentum equation pressure gradient, and velocities from the Eulerian side for use in fluxes in the continuity and tracer equations on the Lagrangian side. The interpolation takes account of the \"sigma-coordinate error\" and the topographic interaction that occurs in the case of the Lagrangian grid. This talk will describe the approach and methodology used in obtaining such an interpolation scheme.
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2007 LOM Workshop, Bergen, Norway, August 20-22, 2007