Physical Mechanisms Driving Oxygen Subduction in the Global Ocean
International audience Future changes in subduction are suspected to be critical for the ocean deoxygenation predicted by climate models over the 21st century. However, the drivers of global oxygen subduction have not been fully described or quantified. Here, we address the physical mechanisms respo...
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ftccsdartic:oai:HAL:insu-03683223v1 2023-12-17T10:46:36+01:00 Physical Mechanisms Driving Oxygen Subduction in the Global Ocean Portela, Esther Kolodziejczyk, Nicolas Vic, Clément Thierry, Virginie Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2020 https://insu.hal.science/insu-03683223 https://insu.hal.science/insu-03683223/document https://insu.hal.science/insu-03683223/file/76537.pdf https://doi.org/10.1029/2020GL089040 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GL089040 insu-03683223 https://insu.hal.science/insu-03683223 https://insu.hal.science/insu-03683223/document https://insu.hal.science/insu-03683223/file/76537.pdf BIBCODE: 2020GeoRL.4789040P doi:10.1029/2020GL089040 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://insu.hal.science/insu-03683223 Geophysical Research Letters, 2020, 47, ⟨10.1029/2020GL089040⟩ oxygen subduction ocean ventilation mode waters oxygen difussion [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2020 ftccsdartic https://doi.org/10.1029/2020GL089040 2023-11-19T00:09:57Z International audience Future changes in subduction are suspected to be critical for the ocean deoxygenation predicted by climate models over the 21st century. However, the drivers of global oxygen subduction have not been fully described or quantified. Here, we address the physical mechanisms responsible for the oxygen transport across the late-winter mixed layer base and their relation with water mass formation. Up to 70% of the global oxygen uptake takes place during Mode Water subduction mostly in the Southern Ocean and the North Atlantic. Te driving mechanisms are (i) the combination of strong currents with large mixed-layer-depth gradients at localized hot spots and (ii) the wind-driven vertical velocity within the subtropical gyres. Oxygen diffusion, despite being underestimated in this study, is likely to play an important role in the global ocean oxygenation. The physical mass flux dominates the total oxygen subduction while the oxygen solubility plays a minor role in its modulation. Article in Journal/Newspaper North Atlantic Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Southern Ocean Geophysical Research Letters 47 17 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
oxygen subduction ocean ventilation mode waters oxygen difussion [SDU]Sciences of the Universe [physics] |
spellingShingle |
oxygen subduction ocean ventilation mode waters oxygen difussion [SDU]Sciences of the Universe [physics] Portela, Esther Kolodziejczyk, Nicolas Vic, Clément Thierry, Virginie Physical Mechanisms Driving Oxygen Subduction in the Global Ocean |
topic_facet |
oxygen subduction ocean ventilation mode waters oxygen difussion [SDU]Sciences of the Universe [physics] |
description |
International audience Future changes in subduction are suspected to be critical for the ocean deoxygenation predicted by climate models over the 21st century. However, the drivers of global oxygen subduction have not been fully described or quantified. Here, we address the physical mechanisms responsible for the oxygen transport across the late-winter mixed layer base and their relation with water mass formation. Up to 70% of the global oxygen uptake takes place during Mode Water subduction mostly in the Southern Ocean and the North Atlantic. Te driving mechanisms are (i) the combination of strong currents with large mixed-layer-depth gradients at localized hot spots and (ii) the wind-driven vertical velocity within the subtropical gyres. Oxygen diffusion, despite being underestimated in this study, is likely to play an important role in the global ocean oxygenation. The physical mass flux dominates the total oxygen subduction while the oxygen solubility plays a minor role in its modulation. |
author2 |
Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Portela, Esther Kolodziejczyk, Nicolas Vic, Clément Thierry, Virginie |
author_facet |
Portela, Esther Kolodziejczyk, Nicolas Vic, Clément Thierry, Virginie |
author_sort |
Portela, Esther |
title |
Physical Mechanisms Driving Oxygen Subduction in the Global Ocean |
title_short |
Physical Mechanisms Driving Oxygen Subduction in the Global Ocean |
title_full |
Physical Mechanisms Driving Oxygen Subduction in the Global Ocean |
title_fullStr |
Physical Mechanisms Driving Oxygen Subduction in the Global Ocean |
title_full_unstemmed |
Physical Mechanisms Driving Oxygen Subduction in the Global Ocean |
title_sort |
physical mechanisms driving oxygen subduction in the global ocean |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://insu.hal.science/insu-03683223 https://insu.hal.science/insu-03683223/document https://insu.hal.science/insu-03683223/file/76537.pdf https://doi.org/10.1029/2020GL089040 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://insu.hal.science/insu-03683223 Geophysical Research Letters, 2020, 47, ⟨10.1029/2020GL089040⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GL089040 insu-03683223 https://insu.hal.science/insu-03683223 https://insu.hal.science/insu-03683223/document https://insu.hal.science/insu-03683223/file/76537.pdf BIBCODE: 2020GeoRL.4789040P doi:10.1029/2020GL089040 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2020GL089040 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
17 |
_version_ |
1785570143819005952 |