Diapycnal oxygen supply to the tropical North Atlantic oxygen minimum zone
The replenishment of consumed oxygen in the open ocean oxygen minimum zone (OMZ) off West Africa in the tropical North Atlantic Ocean is studied, with a focus on oxygen transport across density surfaces (diapycnal flux). The latter is obtained from a large observational set of oxygen profiles and di...
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Copernicus Gesellschaft Mbh
2013
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ftarchimer:oai:archimer.ifremer.fr:24029 2023-05-15T17:30:52+02:00 Diapycnal oxygen supply to the tropical North Atlantic oxygen minimum zone Fischer, T. Banyte, D. Brandt, P. Dengler, M. Krahmann, G. Tanhua, T. Visbeck, Martin 2013 application/pdf https://archimer.ifremer.fr/doc/00129/24029/21985.pdf https://archimer.ifremer.fr/doc/00129/24029/93141.pdf https://doi.org/10.5194/bg-10-5079-2013 https://archimer.ifremer.fr/doc/00129/24029/ eng eng Copernicus Gesellschaft Mbh https://archimer.ifremer.fr/doc/00129/24029/21985.pdf https://archimer.ifremer.fr/doc/00129/24029/93141.pdf doi:10.5194/bg-10-5079-2013 https://archimer.ifremer.fr/doc/00129/24029/ Author(s) 2012. CC Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use CC-BY Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2013 , Vol. 10 , N. 7 , P. 5079-5093 text Publication info:eu-repo/semantics/article 2013 ftarchimer https://doi.org/10.5194/bg-10-5079-2013 2022-04-12T22:50:01Z The replenishment of consumed oxygen in the open ocean oxygen minimum zone (OMZ) off West Africa in the tropical North Atlantic Ocean is studied, with a focus on oxygen transport across density surfaces (diapycnal flux). The latter is obtained from a large observational set of oxygen profiles and diapycnal mixing data from years 2008 to 2010. Diapycnal mixing is inferred from different sources: a large scale tracer release experiment, microstructure profiles, and shipboard acoustic current measurements plus density profiles. The average diapycnal diffusivity in the study area is 1 × 10−5 m2 s−1. No significant vertical gradient of average diapycnal diffusivities exists in the depth interval from 150 to 500 m. The diapycnal flux is found to contribute substantially to the oxygen supply of the OMZ. Within the OMZ core, 1.5 µmol kg−1 a−1 of oxygen is supplied via diapycnal mixing, contributing about a third of the total demand. The oxygen that is contributed via diapycnal mixing originates from oxygen that has been laterally supplied within the overlying Central Water layer by advective and eddy fluxes. Due to the existence of a separate shallow oxygen minimum at about 100 m depth throughout most of the study area, there is no direct net vertical oxygen flux from the surface layer of the study area into the Central Water layer. Thus all oxygen supply of the OMZ is associated with remote pathways. Article in Journal/Newspaper North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Biogeosciences 10 7 5079 5093 |
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 replenishment of consumed oxygen in the open ocean oxygen minimum zone (OMZ) off West Africa in the tropical North Atlantic Ocean is studied, with a focus on oxygen transport across density surfaces (diapycnal flux). The latter is obtained from a large observational set of oxygen profiles and diapycnal mixing data from years 2008 to 2010. Diapycnal mixing is inferred from different sources: a large scale tracer release experiment, microstructure profiles, and shipboard acoustic current measurements plus density profiles. The average diapycnal diffusivity in the study area is 1 × 10−5 m2 s−1. No significant vertical gradient of average diapycnal diffusivities exists in the depth interval from 150 to 500 m. The diapycnal flux is found to contribute substantially to the oxygen supply of the OMZ. Within the OMZ core, 1.5 µmol kg−1 a−1 of oxygen is supplied via diapycnal mixing, contributing about a third of the total demand. The oxygen that is contributed via diapycnal mixing originates from oxygen that has been laterally supplied within the overlying Central Water layer by advective and eddy fluxes. Due to the existence of a separate shallow oxygen minimum at about 100 m depth throughout most of the study area, there is no direct net vertical oxygen flux from the surface layer of the study area into the Central Water layer. Thus all oxygen supply of the OMZ is associated with remote pathways. |
format |
Article in Journal/Newspaper |
author |
Fischer, T. Banyte, D. Brandt, P. Dengler, M. Krahmann, G. Tanhua, T. Visbeck, Martin |
spellingShingle |
Fischer, T. Banyte, D. Brandt, P. Dengler, M. Krahmann, G. Tanhua, T. Visbeck, Martin Diapycnal oxygen supply to the tropical North Atlantic oxygen minimum zone |
author_facet |
Fischer, T. Banyte, D. Brandt, P. Dengler, M. Krahmann, G. Tanhua, T. Visbeck, Martin |
author_sort |
Fischer, T. |
title |
Diapycnal oxygen supply to the tropical North Atlantic oxygen minimum zone |
title_short |
Diapycnal oxygen supply to the tropical North Atlantic oxygen minimum zone |
title_full |
Diapycnal oxygen supply to the tropical North Atlantic oxygen minimum zone |
title_fullStr |
Diapycnal oxygen supply to the tropical North Atlantic oxygen minimum zone |
title_full_unstemmed |
Diapycnal oxygen supply to the tropical North Atlantic oxygen minimum zone |
title_sort |
diapycnal oxygen supply to the tropical north atlantic oxygen minimum zone |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2013 |
url |
https://archimer.ifremer.fr/doc/00129/24029/21985.pdf https://archimer.ifremer.fr/doc/00129/24029/93141.pdf https://doi.org/10.5194/bg-10-5079-2013 https://archimer.ifremer.fr/doc/00129/24029/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2013 , Vol. 10 , N. 7 , P. 5079-5093 |
op_relation |
https://archimer.ifremer.fr/doc/00129/24029/21985.pdf https://archimer.ifremer.fr/doc/00129/24029/93141.pdf doi:10.5194/bg-10-5079-2013 https://archimer.ifremer.fr/doc/00129/24029/ |
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-10-5079-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
7 |
container_start_page |
5079 |
op_container_end_page |
5093 |
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1766127980158910464 |