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| Titel |
Evaluating two numerical advection schemes in HYCOM for eddy-resolving modelling of the Agulhas Current |
| VerfasserIn |
B. C. Backeberg, L. Bertino, J. A. Johannessen |
| 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 ; 5, no. 2 ; Nr. 5, no. 2 (2009-06-02), S.173-190 |
| Datensatznummer |
250002421
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| Publikation (Nr.) |
 copernicus.org/os-5-173-2009.pdf |
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| Zusammenfassung |
| A 4th order advection scheme is applied in a nested eddy-resolving Hybrid
Coordinate Ocean Model (HYCOM) of the greater Agulhas Current system for the
purpose of testing advanced numerics as a means for improving the model
simulation for eventual operational implementation. Model validation
techniques comparing sea surface height variations, sea level skewness and
variogram analyses to satellite altimetry measurements quantify that
generally the 4th order advection scheme improves the realism of the model
simulation. The most striking improvement over the standard 2nd order
momentum advection scheme, is that the southern Agulhas Current is simulated
as a well-defined meandering current, rather than a train of successive
eddies. A better vertical structure and stronger poleward transports in the
Agulhas Current core contribute toward a better southwestward penetration of
the current, and its temperature field, implying a stronger Indo-Atlantic
inter-ocean exchange. It is found that the transport, and hence this
exchange, is sensitive to the occurrences of mesoscale features originating
upstream in the Mozambique Channel and southern East Madagascar Current, and
that the improved HYCOM simulation is well suited for further studies of
these inter-actions. |
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