Analysis of an 80-Year Integration of a 1/3-Degree Ocean Model of the Subpolar North Atlantic |
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| Authors: | Daniel?Deacu Email author" target="_blank">Paul?G?MyersEmail author |
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| Institution: | (1) Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, T6G 2E3, Canada |
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| Abstract: | Previous work had examined an ocean model of the subpolar gyre of the North Atlantic Ocean that used the Gent and McWilliams parameterization with a variable eddy-transfer coefficient, and showed significant improvements to the model’s circulation and hydrography. This note examines an extended (80-year-long) integration of the same model and focuses on the adjustment of the intermediate and deep waters as well as on model stability. It is shown that the model is able to retain a good representation of the water masses, especially in the Labrador Sea, through the full integration. Labrador Sea Water dispersal is well simulated by the model in the western basin, with a good correspondence between the model and observational salinities on the σ2 = 36.95 isopycnal surface. Labrador Sea Water dispersal to the eastern basin is not nearly as well represented, as this water mass has trouble passing over the Mid-Atlantic Ridge in the model. The variable eddy-transfer coefficient significantly improves the model representation of the Cold Intermediate Layer on the Labrador shelf by reducing spurious diapycnal mixing. Finally, the evidence in this note suggests that open boundary conditions do not generate significant model drift, even for integrations approaching a century in length. |
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| Keywords: | Numerical ocean model eddy parameterization variable eddy-transfer coefficient Labrador Sea Water North Atlantic |
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