Mass, nutrient and oxygen budgets for the northeastern Atlantic Ocean
15 páginas, 4 figuras, 4 tablas 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 f...
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Online Access: | http://hdl.handle.net/10261/58939 https://doi.org/10.5194/bg-9-4099-2012 |
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ftcsic:oai:digital.csic.es:10261/58939 2024-02-11T10:04:22+01:00 Mass, nutrient and oxygen budgets for the northeastern Atlantic Ocean Maze, G. Mercier, Herlé Thierry, V. Mémery, L. Morin, Pascal Pérez, Fiz F. 2012 http://hdl.handle.net/10261/58939 https://doi.org/10.5194/bg-9-4099-2012 en eng European Geosciences Union #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/EC/FP7/264879 http://dx.doi.org/10.5194/bg-9-4099-2012 Biogeosciences 9(10): 4099-4113 (2012) 1726-4170 http://hdl.handle.net/10261/58939 doi:10.5194/bg-9-4099-2012 1726-4189 open artículo http://purl.org/coar/resource_type/c_6501 2012 ftcsic https://doi.org/10.5194/bg-9-4099-2012 2024-01-16T09:41:57Z 15 páginas, 4 figuras, 4 tablas 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. G. ... Article in Journal/Newspaper Greenland Greenland-Scotland Ridge Nordic Seas Northeast Atlantic Digital.CSIC (Spanish National Research Council) 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 |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
description |
15 páginas, 4 figuras, 4 tablas 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. G. ... |
format |
Article in Journal/Newspaper |
author |
Maze, G. Mercier, Herlé Thierry, V. Mémery, L. Morin, Pascal Pérez, Fiz F. |
spellingShingle |
Maze, G. Mercier, Herlé Thierry, V. Mémery, L. Morin, Pascal Pérez, Fiz F. Mass, nutrient and oxygen budgets for the northeastern Atlantic Ocean |
author_facet |
Maze, G. Mercier, Herlé Thierry, V. Mémery, L. Morin, Pascal Pérez, Fiz F. |
author_sort |
Maze, G. |
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 |
European Geosciences Union |
publishDate |
2012 |
url |
http://hdl.handle.net/10261/58939 https://doi.org/10.5194/bg-9-4099-2012 |
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_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/EC/FP7/264879 http://dx.doi.org/10.5194/bg-9-4099-2012 Biogeosciences 9(10): 4099-4113 (2012) 1726-4170 http://hdl.handle.net/10261/58939 doi:10.5194/bg-9-4099-2012 1726-4189 |
op_rights |
open |
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_ |
1790600948656111616 |