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| Titel |
An improved parameterization of tidal mixing for ocean models |
| VerfasserIn |
A. Schmittner, G. D. Egbert |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 1 ; Nr. 7, no. 1 (2014-01-28), S.211-224 |
| Datensatznummer |
250115538
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| Publikation (Nr.) |
 copernicus.org/gmd-7-211-2014.pdf |
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| Zusammenfassung |
| Two modifications to an existing scheme of tidal mixing are implemented in
the coarse resolution ocean component of a global climate model. First, the
vertical distribution of energy flux out of the barotropic tide is determined
using high resolution bathymetry. This shifts the levels of mixing higher up
in the water column and leads to a stronger mid-depth meridional overturning
circulation in the model. Second, the local dissipation efficiency for
diurnal tides is assumed to be larger than that for the semi-diurnal tides
poleward of 30°. Both modifications are shown to improve agreement
with observational estimates of diapycnal diffusivities based on
microstructure measurements and circulation indices. We also assess impacts
of different spatial distributions of the barotropic energy loss. Estimates
based on satellite altimetry lead to larger diffusivities in the deep ocean
and hence a stronger deep overturning circulation in our climate model that
is in better agreement with observation based estimates compared to those
based on a tidal model. |
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