Dissolved organic nitrogen production and export by meridional overturning in the eastern subpolar North Atlantic
Dissolved organic matter (DOM) is produced in the surface and exported towards the deep ocean, adding ∼ 2 PgC/year to the global carbon export. Due to its central role in the Meridional Overturning Circulation, the eastern subpolar North Atlantic (eSPNA) contributes largely to this export. Here we q...
Published in: | Geophysical Research Letters |
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American Geophysical Union (AGU)
2019
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Online Access: | http://hdl.handle.net/10508/14868 https://doi.org/10.1029/2018GL080284 |
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ftieo:oai:repositorio.ieo.es:10508/14868 2023-05-15T16:29:05+02:00 Dissolved organic nitrogen production and export by meridional overturning in the eastern subpolar North Atlantic Fernández-Castro, F. (Francisco) Álvarez, M. (Marta) Nieto-Cid, M. (Mar) Zunino-Rodríguez, P. (Patricia) Mercier, H. Álvarez-Salgado, X.A. 2019 http://hdl.handle.net/10508/14868 https://doi.org/10.1029/2018GL080284 eng eng American Geophysical Union (AGU) Centro Oceanográfico de A Coruña http://hdl.handle.net/10508/14868 doi:10.1029/2018GL080284 openAccess article 2019 ftieo https://doi.org/10.1029/2018GL080284 2022-08-30T23:47:33Z Dissolved organic matter (DOM) is produced in the surface and exported towards the deep ocean, adding ∼ 2 PgC/year to the global carbon export. Due to its central role in the Meridional Overturning Circulation, the eastern subpolar North Atlantic (eSPNA) contributes largely to this export. Here we quantify the transport and budget of dissolved organic nitrogen (DON) in the eSPNA, in a box delimited by the OVIDE 2002 section and the Greenland-Iceland-Scotland sills. The Meridional Overturning Circulation exports >15.9 TgN/year of DON downward and, contrary to the extended view that these are materials of subtropical origin, up to 33% of the vertical flux derives from a net local DON production of 7.1 ± 2.6 TgN/year. The low C:N molar ratio of DOM production (7.4 ± 4.1) and the relatively short transit times in the eSPNA (3 ± 1 year) suggest that local biogeochemical transformations result in the injection of fresh bioavailable DOM to the deep ocean. Article in Journal/Newspaper Greenland Iceland North Atlantic Instituto Español de Oceanografía: e-IEO Greenland Geophysical Research Letters 46 7 3832 3842 |
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Open Polar |
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Instituto Español de Oceanografía: e-IEO |
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ftieo |
language |
English |
description |
Dissolved organic matter (DOM) is produced in the surface and exported towards the deep ocean, adding ∼ 2 PgC/year to the global carbon export. Due to its central role in the Meridional Overturning Circulation, the eastern subpolar North Atlantic (eSPNA) contributes largely to this export. Here we quantify the transport and budget of dissolved organic nitrogen (DON) in the eSPNA, in a box delimited by the OVIDE 2002 section and the Greenland-Iceland-Scotland sills. The Meridional Overturning Circulation exports >15.9 TgN/year of DON downward and, contrary to the extended view that these are materials of subtropical origin, up to 33% of the vertical flux derives from a net local DON production of 7.1 ± 2.6 TgN/year. The low C:N molar ratio of DOM production (7.4 ± 4.1) and the relatively short transit times in the eSPNA (3 ± 1 year) suggest that local biogeochemical transformations result in the injection of fresh bioavailable DOM to the deep ocean. |
format |
Article in Journal/Newspaper |
author |
Fernández-Castro, F. (Francisco) Álvarez, M. (Marta) Nieto-Cid, M. (Mar) Zunino-Rodríguez, P. (Patricia) Mercier, H. Álvarez-Salgado, X.A. |
spellingShingle |
Fernández-Castro, F. (Francisco) Álvarez, M. (Marta) Nieto-Cid, M. (Mar) Zunino-Rodríguez, P. (Patricia) Mercier, H. Álvarez-Salgado, X.A. Dissolved organic nitrogen production and export by meridional overturning in the eastern subpolar North Atlantic |
author_facet |
Fernández-Castro, F. (Francisco) Álvarez, M. (Marta) Nieto-Cid, M. (Mar) Zunino-Rodríguez, P. (Patricia) Mercier, H. Álvarez-Salgado, X.A. |
author_sort |
Fernández-Castro, F. (Francisco) |
title |
Dissolved organic nitrogen production and export by meridional overturning in the eastern subpolar North Atlantic |
title_short |
Dissolved organic nitrogen production and export by meridional overturning in the eastern subpolar North Atlantic |
title_full |
Dissolved organic nitrogen production and export by meridional overturning in the eastern subpolar North Atlantic |
title_fullStr |
Dissolved organic nitrogen production and export by meridional overturning in the eastern subpolar North Atlantic |
title_full_unstemmed |
Dissolved organic nitrogen production and export by meridional overturning in the eastern subpolar North Atlantic |
title_sort |
dissolved organic nitrogen production and export by meridional overturning in the eastern subpolar north atlantic |
publisher |
American Geophysical Union (AGU) |
publishDate |
2019 |
url |
http://hdl.handle.net/10508/14868 https://doi.org/10.1029/2018GL080284 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Iceland North Atlantic |
genre_facet |
Greenland Iceland North Atlantic |
op_relation |
http://hdl.handle.net/10508/14868 doi:10.1029/2018GL080284 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1029/2018GL080284 |
container_title |
Geophysical Research Letters |
container_volume |
46 |
container_issue |
7 |
container_start_page |
3832 |
op_container_end_page |
3842 |
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1766018775089414144 |