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| Titel |
Influence of numerical schemes on current-topography interactions in 1/4° global ocean simulations |
| VerfasserIn |
T. Penduff, J. Sommer, B. Barnier, A.-M. Treguier, J.-M. Molines, G. Madec |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 3, no. 4 ; Nr. 3, no. 4 (2007-12-20), S.509-524 |
| Datensatznummer |
250001200
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| Publikation (Nr.) |
 copernicus.org/os-3-509-2007.pdf |
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| Zusammenfassung |
| The combined use of partial steps and of an energy-enstrophy conserving momentum advection scheme
was shown by Barnier et al. (2006) to yield substantial improvements in the surface solution of the DRAKKAR
¼° global sea-ice/ocean model. The present study extends this investigation below the surface
with a special focus on the Atlantic
and reveals many improvements there as well: e.g. more realistic path, structure and transports of major currents
(Gulf Stream, North Atlantic Current, Confluence region, Zapiola anticyclone), behavior of shedded rings,
narrower subsurface boundary currents, stronger mean and eddy flows (MKE and EKE) at depth, beneficial
enhancement of cyclonic (anticyclonic) flows around topographic depressions (mountains).
Interestingly, adding a no-slip boundary condition to this improved model setup cancels most of these
improvements, bringing back the biases diagnosed without the improved momentum advection
scheme and partial steps (these biases are typical of other models at comparable or higher resolutions).
This shows that current-topography interactions and full-depth eddy-admitting model solutions
can be seriously deteriorated by near-bottom sidewall friction, either explicit or inherent to inadequate
numerical schemes. |
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