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| Titel |
The effect of various vertical discretization schemes and horizontal diffusion parameterization on the performance of a 3-D ocean model: the Black Sea case study |
| VerfasserIn |
G. Shapiro, M. Luneva, J. Pickering, D. Storkey |
| 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 ; 9, no. 2 ; Nr. 9, no. 2 (2013-03-21), S.377-390 |
| Datensatznummer |
250018042
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| Publikation (Nr.) |
 copernicus.org/os-9-377-2013.pdf |
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| Zusammenfassung |
| Results of a sensitivity study are presented from various configurations of
the NEMO ocean model in the Black Sea. The standard choices of vertical
discretization, viz. z levels, s coordinates and enveloped s coordinates, all
show their limitations in the areas of complex topography. Two new hybrid
vertical coordinate schemes are presented: the "s-on-top-of-z" and its
enveloped version. The hybrid grids use s coordinates or enveloped
s coordinates in the upper layer, from the sea surface to the depth of the
shelf break, and z-coordinates are set below this level. The study is carried
out for a number of idealised and real world settings. The hybrid schemes
help reduce errors generated by the standard schemes in the areas of steep
topography. Results of sensitivity tests with various horizontal diffusion
formulations are used to identify the optimum value of Smagorinsky
diffusivity coefficient to best represent the mesoscale activity. |
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