On the role of the unresolved eddies in a model of the residual currents in the central strait of Georgia,B.C.: Research Note |
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| Authors: | J. Fyfe S.G. Marinone |
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| Affiliation: | 1. Canadian Centre for Climate Modelling and Analysis , Atmospheric Environment Service , Victoria, British Columbia, Canada , V8W 2Y2;2. Centro de Investigation Cientifica y de , Education Superior de Ensenada , Ensenada, B.C., Mexico |
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| Abstract: | Abstract A depth‐independent numerical model of the Juan de Fuca/Strait of Georgia system reproduces the broad structure of the observed depth‐averaged residual circulation in the Central Strait of Georgia but underestimates its magnitude (Marinone and Fyfe, 1992). Here we present some new calculations based on a re‐parameterization of the unresolved eddies in terms of “statistical dynamical tendencies” instead of the previous eddy‐viscosity treatment. With the new parameterization, the simulated time‐mean flow is closer to the observed circulation both in structure and magnitude. While not specifically designed to do so, the new parameterization also leads to a modest improvement in the low‐pass filtered component of the flow. Based on these results, the depth‐averaged residual currents in the region are conjectured to involve a four‐way balance between the hitherto ignored effect of “statistical dynamical tendencies” and conventional tidal, atmospheric and buoyancy forcing. |
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