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| Titel |
Influence of Rossby waves on primary production from a coupled physical-biogeochemical model in the North Atlantic Ocean |
| VerfasserIn |
G. Charria, I. Dadou, P. Cipollini, M. Drévillon, V. Garçon |
| 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 ; 4, no. 3 ; Nr. 4, no. 3 (2008-09-01), S.199-213 |
| Datensatznummer |
250001758
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| Publikation (Nr.) |
 copernicus.org/os-4-199-2008.pdf |
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| Zusammenfassung |
Rossby waves appear to have a clear signature on surface chlorophyll
concentrations which can be explained by a combination of vertical and
horizontal mechanisms. In this study, we investigate the role of the
different physical processes in the north Atlantic to explain the surface
chlorophyll signatures and the consequences on primary production, using a 3-D
coupled physical/biogeochemical model for the year 1998.
The analysis at 20 given latitudes, mainly located in the subtropical gyre,
where Rossby waves are strongly correlated with a surface chlorophyll
signature, shows the important contribution of horizontal advection and of
vertical advection and diffusion of inorganic dissolved nitrogen. The main
control mechanism differs according to the biogeochemical background
conditions of the area.
The surface chlorophyll anomalies, induced by these physical mechanisms, have
an impact on primary production. We estimate that Rossby waves induce,
locally in space and time, increases (generally associated with the
chlorophyll wave crest) and decreases (generally associated with the
chlorophyll wave trough) in primary production, ~±20% of the
estimated background primary production. This symmetrical situation suggests
a net weak effect of Rossby waves on primary production. |
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