An eddy-permitting coupled physical-biological model of the North Atlantic 1. Sensitivity to advection numerics and mixed layer physics
Rez.: Physical influences on biological primary production in the North Atlantic are investigated by coupling a four-component pelagic ecosystem model with a high-resolution numerical circulation model. A series of sensitivity experiments demostrates the important role of an accurate formulation of...
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| Veröffentlicht in: | Global biogeochemical cycles |
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| Format: | UnknownFormat |
| Sprache: | eng |
| Veröffentlicht: |
1999
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Tag hinzufügen | Zusammenfassung: | Rez.: Physical influences on biological primary production in the North Atlantic are investigated by coupling a four-component pelagic ecosystem model with a high-resolution numerical circulation model. A series of sensitivity experiments demostrates the important role of an accurate formulation of upper ocean turbulence and advection numerics. The unrealistically large diffusitivity implicit in upstream advection approximately doubles primary production when compared with a less diffusive, higher-order, positive-definite advection scheme. This is of particular concern in the equatorial upwelling region where upstream advection leads to a considerable increase of upper ocean nitrate concentrations. Counteracting this effect of unrealistically large implicit diffusion by changes in the biological model could easily lead to misconceptions in the interpretation of ecosystem dynamics. Subgrid-scale diapycnal diffiusion strongly controls biological production in the subtropical gyre when winter mixing does not reach the nutricline. The parameterization of vertical viscosity is important mainly in the equatorial region where friction becomes an important agent in the momentum balance. |
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| Beschreibung: | 26 |
| ISSN: | 0886-6236 |