Mass, nutrient and oxygen budgets for the northeastern Atlantic Ocean
The northeast Atlantic is a key horizontal and vertical crossroads region for the meridional overturning circulation, but basic nutrient and oxygen fluxes are still poorly constrained by observations in the region. A surface to bottom northeast Atlantic Ocean budget for mass, nutrients (nitrate and...
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ftarchimer:oai:archimer.ifremer.fr:21101 2023-05-15T16:28:57+02:00 Mass, nutrient and oxygen budgets for the northeastern Atlantic Ocean Maze, Guillaume Mercier, Herle Thierry, Virginie Memery, Laurent Morin, P. Perez, F.f. 2012 application/pdf https://archimer.ifremer.fr/doc/00100/21101/18724.pdf https://doi.org/10.5194/bg-9-4099-2012 https://archimer.ifremer.fr/doc/00100/21101/ eng eng Copernicus Gesellschaft Mbh https://archimer.ifremer.fr/doc/00100/21101/18724.pdf doi:10.5194/bg-9-4099-2012 https://archimer.ifremer.fr/doc/00100/21101/ Author(s) 2012. CC Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use CC-BY Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2012 , Vol. 9 , N. 10 , P. 4099-4113 text Publication info:eu-repo/semantics/article 2012 ftarchimer https://doi.org/10.5194/bg-9-4099-2012 2021-09-23T20:21:24Z The northeast Atlantic is a key horizontal and vertical crossroads region for the meridional overturning circulation, but basic nutrient and oxygen fluxes are still poorly constrained by observations in the region. A surface to bottom northeast Atlantic Ocean budget for mass, nutrients (nitrate and phosphate) and oxygen is determined using an optimization method based on three surveys of the OVIDE transect (from Greenland to Portugal) completed with the World Ocean Atlas 2009. Budgets are derived for two communicating boxes representing the northeastern European basin (NEEB) and the Irminger Sea. For the NEEB (Irminger) box, it is found that 30% of the mass import (export) across the OVIDE section reach (originate from) the Nordic Seas, while 70% are redistributed between both boxes through the Reykjanes Ridge (9.3 ± 0.7 × 109 kg s−1). Net biological source/sink terms of nitrate point to both the Irminger and NEEB boxes as net organic matter production sites (consuming nitrate at a rate of –7.8 ± 6.5 kmol s−1 and –8.4 ± 6.6 kmol s−1, respectively). Using a standard Redfield ratio of C : N = 106 : 16, nitrate consumption rates indicate that about 40 TgC yr−1 of carbon is fixed by organic matter production between the OVIDE transect and the Greenland–Scotland Ridge. Nutrient fluxes also induce a net biological production of oxygen of 73 ± 60 kmol s−1 and 79 ± 62 kmol s−1 in the Irminger and NEEB boxes, which points to the region as being autotrophic. The abiotic air–sea oxygen flux leads to an oceanic oxygen uptake in the two regions (264 ± 66 kmol s−1 in the north and 443 ± 70 kmol s−1 in the south). The abiotic flux is partitioned into a mixing and a thermal component. It is found that the Irminger Sea oceanic oxygen uptake is driven by an air–sea heat flux cooling increasing the ocean surface oxygen solubility. Over the northeastern European basin the mixing component is about half the thermal flux, presumably because of the oxygen minimum in the subtropical thermocline. Article in Journal/Newspaper Greenland Greenland-Scotland Ridge Nordic Seas Northeast Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Biogeosciences 9 10 4099 4113 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
The northeast Atlantic is a key horizontal and vertical crossroads region for the meridional overturning circulation, but basic nutrient and oxygen fluxes are still poorly constrained by observations in the region. A surface to bottom northeast Atlantic Ocean budget for mass, nutrients (nitrate and phosphate) and oxygen is determined using an optimization method based on three surveys of the OVIDE transect (from Greenland to Portugal) completed with the World Ocean Atlas 2009. Budgets are derived for two communicating boxes representing the northeastern European basin (NEEB) and the Irminger Sea. For the NEEB (Irminger) box, it is found that 30% of the mass import (export) across the OVIDE section reach (originate from) the Nordic Seas, while 70% are redistributed between both boxes through the Reykjanes Ridge (9.3 ± 0.7 × 109 kg s−1). Net biological source/sink terms of nitrate point to both the Irminger and NEEB boxes as net organic matter production sites (consuming nitrate at a rate of –7.8 ± 6.5 kmol s−1 and –8.4 ± 6.6 kmol s−1, respectively). Using a standard Redfield ratio of C : N = 106 : 16, nitrate consumption rates indicate that about 40 TgC yr−1 of carbon is fixed by organic matter production between the OVIDE transect and the Greenland–Scotland Ridge. Nutrient fluxes also induce a net biological production of oxygen of 73 ± 60 kmol s−1 and 79 ± 62 kmol s−1 in the Irminger and NEEB boxes, which points to the region as being autotrophic. The abiotic air–sea oxygen flux leads to an oceanic oxygen uptake in the two regions (264 ± 66 kmol s−1 in the north and 443 ± 70 kmol s−1 in the south). The abiotic flux is partitioned into a mixing and a thermal component. It is found that the Irminger Sea oceanic oxygen uptake is driven by an air–sea heat flux cooling increasing the ocean surface oxygen solubility. Over the northeastern European basin the mixing component is about half the thermal flux, presumably because of the oxygen minimum in the subtropical thermocline. |
format |
Article in Journal/Newspaper |
author |
Maze, Guillaume Mercier, Herle Thierry, Virginie Memery, Laurent Morin, P. Perez, F.f. |
spellingShingle |
Maze, Guillaume Mercier, Herle Thierry, Virginie Memery, Laurent Morin, P. Perez, F.f. Mass, nutrient and oxygen budgets for the northeastern Atlantic Ocean |
author_facet |
Maze, Guillaume Mercier, Herle Thierry, Virginie Memery, Laurent Morin, P. Perez, F.f. |
author_sort |
Maze, Guillaume |
title |
Mass, nutrient and oxygen budgets for the northeastern Atlantic Ocean |
title_short |
Mass, nutrient and oxygen budgets for the northeastern Atlantic Ocean |
title_full |
Mass, nutrient and oxygen budgets for the northeastern Atlantic Ocean |
title_fullStr |
Mass, nutrient and oxygen budgets for the northeastern Atlantic Ocean |
title_full_unstemmed |
Mass, nutrient and oxygen budgets for the northeastern Atlantic Ocean |
title_sort |
mass, nutrient and oxygen budgets for the northeastern atlantic ocean |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2012 |
url |
https://archimer.ifremer.fr/doc/00100/21101/18724.pdf https://doi.org/10.5194/bg-9-4099-2012 https://archimer.ifremer.fr/doc/00100/21101/ |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Greenland Irminger Sea Reykjanes |
geographic_facet |
Greenland Irminger Sea Reykjanes |
genre |
Greenland Greenland-Scotland Ridge Nordic Seas Northeast Atlantic |
genre_facet |
Greenland Greenland-Scotland Ridge Nordic Seas Northeast Atlantic |
op_source |
Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2012 , Vol. 9 , N. 10 , P. 4099-4113 |
op_relation |
https://archimer.ifremer.fr/doc/00100/21101/18724.pdf doi:10.5194/bg-9-4099-2012 https://archimer.ifremer.fr/doc/00100/21101/ |
op_rights |
Author(s) 2012. CC Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-9-4099-2012 |
container_title |
Biogeosciences |
container_volume |
9 |
container_issue |
10 |
container_start_page |
4099 |
op_container_end_page |
4113 |
_version_ |
1766018642769608704 |