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G. I. Marchuk, J. Schrter, V. B. Zalesny
Numerical study of the global ocean equilibrium circulation
A new version of the global ocean general circulation model with σ -coordinates is presented. The modelled area approximates the whole World ocean basin from the coast of Antarctica to the North Pole. The model is designed for very long integration periods. Accordingly the numerical techniques applied are very efficient, using implicit timestepping and operator splitting methods. The model is driven at the surface by wind-stress and by restoring temperature and salinity to the observed annual cycle. The cyclo-stationary solution of the model is shown to depend on the initial conditions even after many thousand years of integration. Four different solutions are briefly reported in this paper. The existence of multiple equilibria has been reported previously only under mixed boundary conditions. The key mechanismof the multiple equilibria is nonlinear deep convection processes. Numerical experiments show that global mean values of temperature and salinity are rather important parameters affecting the quasi-equilibrium state.
Russian Journal of Numerical Analysis and Mathematical Modelling, Walter de Gruyter
Print ISSN: 0927-6467
Volume: 18, 08/2003
Pages: 307 - 335