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Importance of dissolved organic nitrogen in the north Atlantic Ocean in sustaining primary production: a 3-D modelling approach

Importance of dissolved organic nitrogen in the north Atlantic Ocean in sustaining primary production: a 3-D modelling approach
Importance of dissolved organic nitrogen in the north Atlantic Ocean in sustaining primary production: a 3-D modelling approach
An eddy-permitting coupled ecosystemcirculation model including dissolved organic matter is used to estimate the dissolved organic nitrogen (DON) supply sustaining primary production in the subtropical north Atlantic Ocean. After an analysis of the coupled model performances compared to the data, a sensitivity study demonstrates the strong impact of parameter values linked to the hydrolysis of particulate organic nitrogen and remineralisation of dissolved organic nitrogen on surface biogeochemical concentrations. The physical transport of dissolved organic nitrogen contributes to maintain the level of primary production in this subtropical gyre. It is dominated by the meridional component. We estimate a meridional net input of 0.039 molNm?2 yr?1 over the domain (13–35 N and 71– 40 W) in the subtropical gyre. This supply is driven by the Ekman transport in the southern part and by non-Ekman transport (meridional current components, eddies, meanders and fronts) in the northern part of the subtropical gyre. At 12 N, our estimate (18 kmolN s?1) confirms the estimation (17.9 kmolN s?1) made by Roussenov et al. (2006) using a simplified biogeochemical model in a large scale model. This DON meridional input is within the range (from 0.05 up to 0.24 molNm?2 yr?1) (McGillicuddy and Robinson, 1997; Oschlies, 2002) of all other possible mechanisms (mesoscale activity, nitrogen fixation, atmospheric deposition) fuelling primary production in the subtropical gyre. The present study confirms that the lateral supply of dissolved organic nitrogen might be important in closing the N budget over the north Atlantic Ocean and quantifies the importance of meridional input of dissolved organic nitrogen.
1726-4170
1437-1455
Charria, G.
60f8c3bc-73da-462e-a12d-79db9bd40f3c
Dadou, I.
7bb564ca-e9a7-4b43-a809-ec25c69d4c75
Llido, J.
2ad27cfd-c93b-4425-8fb9-e51a3a170345
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
Llido, J.
2ad27cfd-c93b-4425-8fb9-e51a3a170345
Drevillon, M.
c94a11a0-e7e3-48cd-8d77-6382cc0746dd
Garcon, V.
d271cd9b-6e2a-4e76-922c-a5915f3c910b

Charria, G., Dadou, I., Llido, J., Drevillon, M. and Garcon, V. (2008) Importance of dissolved organic nitrogen in the north Atlantic Ocean in sustaining primary production: a 3-D modelling approach. Biogeosciences, 5 (5), 1437-1455.

Record type: Article

Abstract

An eddy-permitting coupled ecosystemcirculation model including dissolved organic matter is used to estimate the dissolved organic nitrogen (DON) supply sustaining primary production in the subtropical north Atlantic Ocean. After an analysis of the coupled model performances compared to the data, a sensitivity study demonstrates the strong impact of parameter values linked to the hydrolysis of particulate organic nitrogen and remineralisation of dissolved organic nitrogen on surface biogeochemical concentrations. The physical transport of dissolved organic nitrogen contributes to maintain the level of primary production in this subtropical gyre. It is dominated by the meridional component. We estimate a meridional net input of 0.039 molNm?2 yr?1 over the domain (13–35 N and 71– 40 W) in the subtropical gyre. This supply is driven by the Ekman transport in the southern part and by non-Ekman transport (meridional current components, eddies, meanders and fronts) in the northern part of the subtropical gyre. At 12 N, our estimate (18 kmolN s?1) confirms the estimation (17.9 kmolN s?1) made by Roussenov et al. (2006) using a simplified biogeochemical model in a large scale model. This DON meridional input is within the range (from 0.05 up to 0.24 molNm?2 yr?1) (McGillicuddy and Robinson, 1997; Oschlies, 2002) of all other possible mechanisms (mesoscale activity, nitrogen fixation, atmospheric deposition) fuelling primary production in the subtropical gyre. The present study confirms that the lateral supply of dissolved organic nitrogen might be important in closing the N budget over the north Atlantic Ocean and quantifies the importance of meridional input of dissolved organic nitrogen.

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Published date: 2008

Identifiers

Local EPrints ID: 65046
URI: https://eprints.soton.ac.uk/id/eprint/65046
ISSN: 1726-4170
PURE UUID: 6b77db1a-8bee-478c-b828-a3554a47f7e5

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Date deposited: 28 Jan 2009
Last modified: 13 Mar 2019 20:19

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Contributors

Author: G. Charria
Author: I. Dadou
Author: J. Llido
Author: M. Drevillon
Author: V. Garcon

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