Subduction of carbon, nitrogen, and oxygen in the northeast Atlantic
International audience Northeast Atlantic mode waters (NEAMW) are formed by subduction in a region known to be a strong sink of atmospheric CO 2 . This study investigates the biological and physical carbon pumps involved in this sink. For that purpose, we estimate the annual transfer of carbon, nitr...
Published in: | Journal of Geophysical Research |
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Main Authors: | , , |
Other Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2011
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Online Access: | https://hal.univ-brest.fr/hal-00634525 https://hal.univ-brest.fr/hal-00634525/document https://hal.univ-brest.fr/hal-00634525/file/JGR-Karlesking-2011.pdf https://doi.org/10.1029/2010JC006446 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
mode water carbon pump flux export phytoplankton bloom POMME experiment [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDE]Environmental Sciences |
spellingShingle |
mode water carbon pump flux export phytoplankton bloom POMME experiment [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDE]Environmental Sciences Karleskind, Pierre Lévy, Marina Mémery, Laurent Subduction of carbon, nitrogen, and oxygen in the northeast Atlantic |
topic_facet |
mode water carbon pump flux export phytoplankton bloom POMME experiment [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDE]Environmental Sciences |
description |
International audience Northeast Atlantic mode waters (NEAMW) are formed by subduction in a region known to be a strong sink of atmospheric CO 2 . This study investigates the biological and physical carbon pumps involved in this sink. For that purpose, we estimate the annual transfer of carbon, nitrogen, and oxygen from the surface into the ocean interior through NEAMW subduction. Our estimates are based on a model simulation constrained with data collected during the Programme Océan Multidisciplinaire Méso Echelle (POMME). We found that subduction accounts for a large proportion of carbon export below the mixed layer in the POMME region (38°N-45°N, 16°W-22°W). Fifty percent of labile organic carbon is exported by the biological pump and 50% by subduction; 98% of the total carbon flux below the mixed layer is due to carbon subduction, essentially in the form of dissolved inorganic carbon and of more refractory dissolved organic matter. This is because they are the dominant pools of carbon and are passing through the winter mixed-layer depth gradient that characterizes the region. Our results emphasize that the net export of carbon represents a small fraction of the fluxes of carbon across the mixed layer through the processes of subduction and obduction. Moreover, our results indicate that NEAMW subduction occurs before the spring bloom. This implies that NEAMW is mostly subducted with end-winter characteristics with, in particular, relatively high nutrient content. This reflects a relative inefficiency in nutrient utilization and contrasts with subtropical mode waters, which are subducted during the bloom and are thus relatively poor in nutrients when they are subducted. |
author2 |
Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) CNRS-INSU (POMME and TWISTED programs) |
format |
Article in Journal/Newspaper |
author |
Karleskind, Pierre Lévy, Marina Mémery, Laurent |
author_facet |
Karleskind, Pierre Lévy, Marina Mémery, Laurent |
author_sort |
Karleskind, Pierre |
title |
Subduction of carbon, nitrogen, and oxygen in the northeast Atlantic |
title_short |
Subduction of carbon, nitrogen, and oxygen in the northeast Atlantic |
title_full |
Subduction of carbon, nitrogen, and oxygen in the northeast Atlantic |
title_fullStr |
Subduction of carbon, nitrogen, and oxygen in the northeast Atlantic |
title_full_unstemmed |
Subduction of carbon, nitrogen, and oxygen in the northeast Atlantic |
title_sort |
subduction of carbon, nitrogen, and oxygen in the northeast atlantic |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.univ-brest.fr/hal-00634525 https://hal.univ-brest.fr/hal-00634525/document https://hal.univ-brest.fr/hal-00634525/file/JGR-Karlesking-2011.pdf https://doi.org/10.1029/2010JC006446 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.univ-brest.fr/hal-00634525 Journal of Geophysical Research, 2011, 116, pp.C02025. ⟨10.1029/2010JC006446⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2010JC006446 hal-00634525 https://hal.univ-brest.fr/hal-00634525 https://hal.univ-brest.fr/hal-00634525/document https://hal.univ-brest.fr/hal-00634525/file/JGR-Karlesking-2011.pdf doi:10.1029/2010JC006446 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2010JC006446 |
container_title |
Journal of Geophysical Research |
container_volume |
116 |
container_issue |
C2 |
_version_ |
1766142820226170880 |
spelling |
ftunivnantes:oai:HAL:hal-00634525v1 2023-05-15T17:41:20+02:00 Subduction of carbon, nitrogen, and oxygen in the northeast Atlantic Karleskind, Pierre Lévy, Marina Mémery, Laurent Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) CNRS-INSU (POMME and TWISTED programs) 2011-02-17 https://hal.univ-brest.fr/hal-00634525 https://hal.univ-brest.fr/hal-00634525/document https://hal.univ-brest.fr/hal-00634525/file/JGR-Karlesking-2011.pdf https://doi.org/10.1029/2010JC006446 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2010JC006446 hal-00634525 https://hal.univ-brest.fr/hal-00634525 https://hal.univ-brest.fr/hal-00634525/document https://hal.univ-brest.fr/hal-00634525/file/JGR-Karlesking-2011.pdf doi:10.1029/2010JC006446 info:eu-repo/semantics/OpenAccess ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.univ-brest.fr/hal-00634525 Journal of Geophysical Research, 2011, 116, pp.C02025. ⟨10.1029/2010JC006446⟩ mode water carbon pump flux export phytoplankton bloom POMME experiment [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2011 ftunivnantes https://doi.org/10.1029/2010JC006446 2023-02-08T00:38:39Z International audience Northeast Atlantic mode waters (NEAMW) are formed by subduction in a region known to be a strong sink of atmospheric CO 2 . This study investigates the biological and physical carbon pumps involved in this sink. For that purpose, we estimate the annual transfer of carbon, nitrogen, and oxygen from the surface into the ocean interior through NEAMW subduction. Our estimates are based on a model simulation constrained with data collected during the Programme Océan Multidisciplinaire Méso Echelle (POMME). We found that subduction accounts for a large proportion of carbon export below the mixed layer in the POMME region (38°N-45°N, 16°W-22°W). Fifty percent of labile organic carbon is exported by the biological pump and 50% by subduction; 98% of the total carbon flux below the mixed layer is due to carbon subduction, essentially in the form of dissolved inorganic carbon and of more refractory dissolved organic matter. This is because they are the dominant pools of carbon and are passing through the winter mixed-layer depth gradient that characterizes the region. Our results emphasize that the net export of carbon represents a small fraction of the fluxes of carbon across the mixed layer through the processes of subduction and obduction. Moreover, our results indicate that NEAMW subduction occurs before the spring bloom. This implies that NEAMW is mostly subducted with end-winter characteristics with, in particular, relatively high nutrient content. This reflects a relative inefficiency in nutrient utilization and contrasts with subtropical mode waters, which are subducted during the bloom and are thus relatively poor in nutrients when they are subducted. Article in Journal/Newspaper Northeast Atlantic Université de Nantes: HAL-UNIV-NANTES Journal of Geophysical Research 116 C2 |