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Influence of Rossby waves on primary production from a coupled physical-biogeochemical model in the North Atlantic Ocean

Influence of Rossby waves on primary production from a coupled physical-biogeochemical model in the North Atlantic Ocean
Influence of Rossby waves on primary production from a coupled physical-biogeochemical model in the North Atlantic Ocean
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.
1812-0792
199-213
Charria, G.
60f8c3bc-73da-462e-a12d-79db9bd40f3c
Dadou, I.
7bb564ca-e9a7-4b43-a809-ec25c69d4c75
Cipollini, P.
276e356a-f29e-4192-98b3-9340b491dab8
Drevillon, M.
c94a11a0-e7e3-48cd-8d77-6382cc0746dd
Garcon, V.
d271cd9b-6e2a-4e76-922c-a5915f3c910b
Charria, G.
60f8c3bc-73da-462e-a12d-79db9bd40f3c
Dadou, I.
7bb564ca-e9a7-4b43-a809-ec25c69d4c75
Cipollini, P.
276e356a-f29e-4192-98b3-9340b491dab8
Drevillon, M.
c94a11a0-e7e3-48cd-8d77-6382cc0746dd
Garcon, V.
d271cd9b-6e2a-4e76-922c-a5915f3c910b

Charria, G., Dadou, I., Cipollini, P., Drevillon, M. and Garcon, V. (2008) Influence of Rossby waves on primary production from a coupled physical-biogeochemical model in the North Atlantic Ocean. Ocean Science, 4 (3), 199-213.

Record type: Article

Abstract

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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Published date: 2008

Identifiers

Local EPrints ID: 63742
URI: https://eprints.soton.ac.uk/id/eprint/63742
ISSN: 1812-0792
PURE UUID: 118bf47f-7c79-42f5-b715-a9a9caa47184

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Date deposited: 28 Oct 2008
Last modified: 13 Mar 2019 20:23

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Contributors

Author: G. Charria
Author: I. Dadou
Author: P. Cipollini
Author: M. Drevillon
Author: V. Garcon

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