Physical mechanisms driving oxygen subduction in the global ocean
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 t...
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American Geophysical Union (AGU)
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ftarchimer:oai:archimer.ifremer.fr:75670 2023-05-15T17:33:45+02:00 Physical mechanisms driving oxygen subduction in the global ocean Portela, Esther Kolodziejczyk, Nicolas Vic, Clement Thierry, Virginie 2020-09 application/pdf https://archimer.ifremer.fr/doc/00645/75670/76537.pdf https://archimer.ifremer.fr/doc/00645/75670/76538.pdf https://doi.org/10.1029/2020GL089040 https://archimer.ifremer.fr/doc/00645/75670/ eng eng American Geophysical Union (AGU) https://archimer.ifremer.fr/doc/00645/75670/76537.pdf https://archimer.ifremer.fr/doc/00645/75670/76538.pdf doi:10.1029/2020GL089040 https://archimer.ifremer.fr/doc/00645/75670/ info:eu-repo/semantics/openAccess restricted use Geophysical Research Letters (0094-8276) (American Geophysical Union (AGU)), 2020-09 , Vol. 47 , N. 17 , P. e2020GL089040 (10p.) oxygen subduction ocean ventilation mode waters oxygen difussion text Publication info:eu-repo/semantics/article 2020 ftarchimer https://doi.org/10.1029/2020GL089040 2021-09-23T20:35:46Z 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 hotspots and (ii) the wind‐driven vertical velocity within the Subtropical gyres. Oxygen diffusion, despite being underestimated in this study, is likely to play and 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. Key points Up to 70% of the global oxygen uptake occurs during Mode Water subduction,driven by lateral induction and vertical velocity Oxygen diffusion, despite large uncertainties, is likely to play an important role in the global oxygen uptake Total oxygen subduction is driven by the mass flux, with little contribution of the meridional variability of oxygen concentration Article in Journal/Newspaper North Atlantic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Southern Ocean Geophysical Research Letters 47 17 |
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 |
topic |
oxygen subduction ocean ventilation mode waters oxygen difussion |
spellingShingle |
oxygen subduction ocean ventilation mode waters oxygen difussion Portela, Esther Kolodziejczyk, Nicolas Vic, Clement Thierry, Virginie Physical mechanisms driving oxygen subduction in the global ocean |
topic_facet |
oxygen subduction ocean ventilation mode waters oxygen difussion |
description |
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 hotspots and (ii) the wind‐driven vertical velocity within the Subtropical gyres. Oxygen diffusion, despite being underestimated in this study, is likely to play and 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. Key points Up to 70% of the global oxygen uptake occurs during Mode Water subduction,driven by lateral induction and vertical velocity Oxygen diffusion, despite large uncertainties, is likely to play an important role in the global oxygen uptake Total oxygen subduction is driven by the mass flux, with little contribution of the meridional variability of oxygen concentration |
format |
Article in Journal/Newspaper |
author |
Portela, Esther Kolodziejczyk, Nicolas Vic, Clement Thierry, Virginie |
author_facet |
Portela, Esther Kolodziejczyk, Nicolas Vic, Clement 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 |
American Geophysical Union (AGU) |
publishDate |
2020 |
url |
https://archimer.ifremer.fr/doc/00645/75670/76537.pdf https://archimer.ifremer.fr/doc/00645/75670/76538.pdf https://doi.org/10.1029/2020GL089040 https://archimer.ifremer.fr/doc/00645/75670/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
Geophysical Research Letters (0094-8276) (American Geophysical Union (AGU)), 2020-09 , Vol. 47 , N. 17 , P. e2020GL089040 (10p.) |
op_relation |
https://archimer.ifremer.fr/doc/00645/75670/76537.pdf https://archimer.ifremer.fr/doc/00645/75670/76538.pdf doi:10.1029/2020GL089040 https://archimer.ifremer.fr/doc/00645/75670/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2020GL089040 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
17 |
_version_ |
1766132356866899968 |