Importance of dissolved organic nitrogen in the north Atlantic Ocean in sustaining primary production: a 3-D modelling approach
An eddy-permitting coupled ecosystem-circulation model including dissolved organic matter is used to estimate the dissolved organic nitrogen (DON) supply sustaining primary production in the subtropical north Atlantic Ocean. <br><br> After an analysis of the coupled model...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2008-10-01
|
| Series: | Biogeosciences |
| Online Access: | http://www.biogeosciences.net/5/1437/2008/bg-5-1437-2008.pdf |
| _version_ | 1818520893731635200 |
|---|---|
| author | G. Charria I. Dadou J. Llido M. Drévillon V. Garçon |
| author_facet | G. Charria I. Dadou J. Llido M. Drévillon V. Garçon |
| author_sort | G. Charria |
| collection | DOAJ |
| description | An eddy-permitting coupled ecosystem-circulation model including dissolved organic matter is used to estimate the dissolved organic nitrogen (DON) supply sustaining primary production in the subtropical north Atlantic Ocean. <br><br> 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. <br><br> 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 molN m<sup>&minus;2</sup> yr<sup>&minus;1</sup> over the domain (13–35&deg; N and 71–40&deg; 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&deg; N, our estimate (18 kmolN s<sup>&minus;1</sup>) confirms the estimation (17.9 kmolN s<sup>&minus;1</sup>) 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 molN m<sup>&minus;2</sup> yr<sup>&minus;1</sup>) (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. |
| first_indexed | 2024-12-11T01:43:45Z |
| format | Article |
| id | doaj.art-cd9260eca6d44ca098ba37b8282ce26f |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-12-11T01:43:45Z |
| publishDate | 2008-10-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-cd9260eca6d44ca098ba37b8282ce26f2022-12-22T01:24:58ZengCopernicus PublicationsBiogeosciences1726-41701726-41892008-10-015514371455Importance of dissolved organic nitrogen in the north Atlantic Ocean in sustaining primary production: a 3-D modelling approachG. CharriaI. DadouJ. LlidoM. DrévillonV. GarçonAn eddy-permitting coupled ecosystem-circulation model including dissolved organic matter is used to estimate the dissolved organic nitrogen (DON) supply sustaining primary production in the subtropical north Atlantic Ocean. <br><br> 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. <br><br> 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 molN m<sup>&minus;2</sup> yr<sup>&minus;1</sup> over the domain (13–35&deg; N and 71–40&deg; 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&deg; N, our estimate (18 kmolN s<sup>&minus;1</sup>) confirms the estimation (17.9 kmolN s<sup>&minus;1</sup>) 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 molN m<sup>&minus;2</sup> yr<sup>&minus;1</sup>) (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.http://www.biogeosciences.net/5/1437/2008/bg-5-1437-2008.pdf |
| spellingShingle | G. Charria I. Dadou J. Llido M. Drévillon V. Garçon Importance of dissolved organic nitrogen in the north Atlantic Ocean in sustaining primary production: a 3-D modelling approach Biogeosciences |
| title | Importance of dissolved organic nitrogen in the north Atlantic Ocean in sustaining primary production: a 3-D modelling approach |
| title_full | Importance of dissolved organic nitrogen in the north Atlantic Ocean in sustaining primary production: a 3-D modelling approach |
| title_fullStr | Importance of dissolved organic nitrogen in the north Atlantic Ocean in sustaining primary production: a 3-D modelling approach |
| title_full_unstemmed | Importance of dissolved organic nitrogen in the north Atlantic Ocean in sustaining primary production: a 3-D modelling approach |
| title_short | Importance of dissolved organic nitrogen in the north Atlantic Ocean in sustaining primary production: a 3-D modelling approach |
| title_sort | importance of dissolved organic nitrogen in the north atlantic ocean in sustaining primary production a 3 d modelling approach |
| url | http://www.biogeosciences.net/5/1437/2008/bg-5-1437-2008.pdf |
| work_keys_str_mv | AT gcharria importanceofdissolvedorganicnitrogeninthenorthatlanticoceaninsustainingprimaryproductiona3dmodellingapproach AT idadou importanceofdissolvedorganicnitrogeninthenorthatlanticoceaninsustainingprimaryproductiona3dmodellingapproach AT jllido importanceofdissolvedorganicnitrogeninthenorthatlanticoceaninsustainingprimaryproductiona3dmodellingapproach AT mdrevillon importanceofdissolvedorganicnitrogeninthenorthatlanticoceaninsustainingprimaryproductiona3dmodellingapproach AT vgarcon importanceofdissolvedorganicnitrogeninthenorthatlanticoceaninsustainingprimaryproductiona3dmodellingapproach |