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 qu...
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2019
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Online Access: | https://eprints.soton.ac.uk/455474/ https://eprints.soton.ac.uk/455474/1/Geophysical_Research_Letters_2019_Fern_ndez_Castro_Dissolved_Organic_Nitrogen_Production_and_Export_by_Meridional.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:455474 2023-12-03T10:23:31+01:00 Dissolved Organic Nitrogen Production and Export by Meridional Overturning in the Eastern Subpolar North Atlantic Fernández‐Castro, Bieito Álvarez, Marta Nieto‐Cid, Mar Zunino, Patricia Mercier, Herlé Álvarez‐Salgado, Xosé Antón 2019-04-16 text https://eprints.soton.ac.uk/455474/ https://eprints.soton.ac.uk/455474/1/Geophysical_Research_Letters_2019_Fern_ndez_Castro_Dissolved_Organic_Nitrogen_Production_and_Export_by_Meridional.pdf en English eng https://eprints.soton.ac.uk/455474/1/Geophysical_Research_Letters_2019_Fern_ndez_Castro_Dissolved_Organic_Nitrogen_Production_and_Export_by_Meridional.pdf Fernández‐Castro, Bieito, Álvarez, Marta, Nieto‐Cid, Mar, Zunino, Patricia, Mercier, Herlé and Álvarez‐Salgado, Xosé Antón (2019) Dissolved Organic Nitrogen Production and Export by Meridional Overturning in the Eastern Subpolar North Atlantic. Geophysical Research Letters, 46 (7), 3832-3842. (doi:10.1029/2018GL080284 <http://dx.doi.org/10.1029/2018GL080284>). other Article PeerReviewed 2019 ftsouthampton https://doi.org/10.1029/2018GL080284 2023-11-03T00:04:00Z 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 University of Southampton: e-Prints Soton Greenland Geophysical Research Letters 46 7 3832 3842 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
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, Bieito Álvarez, Marta Nieto‐Cid, Mar Zunino, Patricia Mercier, Herlé Álvarez‐Salgado, Xosé Antón |
spellingShingle |
Fernández‐Castro, Bieito Álvarez, Marta Nieto‐Cid, Mar Zunino, Patricia Mercier, Herlé Álvarez‐Salgado, Xosé Antón Dissolved Organic Nitrogen Production and Export by Meridional Overturning in the Eastern Subpolar North Atlantic |
author_facet |
Fernández‐Castro, Bieito Álvarez, Marta Nieto‐Cid, Mar Zunino, Patricia Mercier, Herlé Álvarez‐Salgado, Xosé Antón |
author_sort |
Fernández‐Castro, Bieito |
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 |
publishDate |
2019 |
url |
https://eprints.soton.ac.uk/455474/ https://eprints.soton.ac.uk/455474/1/Geophysical_Research_Letters_2019_Fern_ndez_Castro_Dissolved_Organic_Nitrogen_Production_and_Export_by_Meridional.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Iceland North Atlantic |
genre_facet |
Greenland Iceland North Atlantic |
op_relation |
https://eprints.soton.ac.uk/455474/1/Geophysical_Research_Letters_2019_Fern_ndez_Castro_Dissolved_Organic_Nitrogen_Production_and_Export_by_Meridional.pdf Fernández‐Castro, Bieito, Álvarez, Marta, Nieto‐Cid, Mar, Zunino, Patricia, Mercier, Herlé and Álvarez‐Salgado, Xosé Antón (2019) Dissolved Organic Nitrogen Production and Export by Meridional Overturning in the Eastern Subpolar North Atlantic. Geophysical Research Letters, 46 (7), 3832-3842. (doi:10.1029/2018GL080284 <http://dx.doi.org/10.1029/2018GL080284>). |
op_rights |
other |
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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1784271675290812416 |