Atlantic Equatorial Undercurrent intensification counteracts warming-induced deoxygenation
The tropical Atlantic upper-ocean circulation experiences multiannual to decadal changes associated with different climate modes and is simultaneously adjusting to climate warming. The most energetic current in the tropical Atlantic is the Equatorial Undercurrent (EUC), which flows eastwards along t...
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ftarchimer:oai:archimer.ifremer.fr:99403 2024-04-21T08:07:50+00:00 Atlantic Equatorial Undercurrent intensification counteracts warming-induced deoxygenation Brandt, Peter Hahn, Johannes Schmidtko, Sunke Tuchen, Franz Philip Kopte, Robert Kiko, Rainer Bourles, Bernard Czeschel, Rena Dengler, Marcus 2021-05 application/pdf https://archimer.ifremer.fr/doc/00882/99403/109496.pdf https://doi.org/10.1038/s41561-021-00716-1 https://archimer.ifremer.fr/doc/00882/99403/ eng eng Nature Research info:eu-repo/grantAgreement/EC/H2020/817578/EU//TRIATLAS https://archimer.ifremer.fr/doc/00882/99403/109496.pdf doi:10.1038/s41561-021-00716-1 https://archimer.ifremer.fr/doc/00882/99403/ info:eu-repo/semantics/openAccess restricted use Nature Geoscience (1752-0894) (Nature Research), 2021-05 , Vol. 14 , N. 5 , P. 278-282 text Article info:eu-repo/semantics/article 2021 ftarchimer https://doi.org/10.1038/s41561-021-00716-1 2024-03-27T15:28:15Z The tropical Atlantic upper-ocean circulation experiences multiannual to decadal changes associated with different climate modes and is simultaneously adjusting to climate warming. The most energetic current in the tropical Atlantic is the Equatorial Undercurrent (EUC), which flows eastwards along the Equator. On the basis of long-term moored observations, we show that the EUC strengthened by more than 20% from 2008 to 2018. The intensification of the EUC is associated with increasing subsurface oxygen concentrations and a thickening of the upper-ocean oxygenated layer in the equatorial Atlantic. These changes counteract climate-warming-induced deoxygenation in the region. The EUC strengthening is found to be mainly forced by trade wind changes in the western tropical North Atlantic. A 60-yr dataset reveals that the recent oxygen increase in the upper equatorial Atlantic is associated with multidecadal variability. This variability is characterized by low oxygen concentrations in the 1990s and early 2000s, and high oxygen concentrations in the 1960s and 1970s. The observed oxygen variability seems to be linked to a compression and expansion of the habitat of tropical pelagic fish, and must be accounted for when evaluating the possible consequences of deoxygenation for marine ecosystems and fisheries. Recent strengthening of the Equatorial Undercurrent counteracts warming-induced deoxygenation in the equatorial Atlantic, according to an analysis of long-term moored observations. Article in Journal/Newspaper North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Nature Geoscience 14 5 278 282 |
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Open Polar |
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Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
The tropical Atlantic upper-ocean circulation experiences multiannual to decadal changes associated with different climate modes and is simultaneously adjusting to climate warming. The most energetic current in the tropical Atlantic is the Equatorial Undercurrent (EUC), which flows eastwards along the Equator. On the basis of long-term moored observations, we show that the EUC strengthened by more than 20% from 2008 to 2018. The intensification of the EUC is associated with increasing subsurface oxygen concentrations and a thickening of the upper-ocean oxygenated layer in the equatorial Atlantic. These changes counteract climate-warming-induced deoxygenation in the region. The EUC strengthening is found to be mainly forced by trade wind changes in the western tropical North Atlantic. A 60-yr dataset reveals that the recent oxygen increase in the upper equatorial Atlantic is associated with multidecadal variability. This variability is characterized by low oxygen concentrations in the 1990s and early 2000s, and high oxygen concentrations in the 1960s and 1970s. The observed oxygen variability seems to be linked to a compression and expansion of the habitat of tropical pelagic fish, and must be accounted for when evaluating the possible consequences of deoxygenation for marine ecosystems and fisheries. Recent strengthening of the Equatorial Undercurrent counteracts warming-induced deoxygenation in the equatorial Atlantic, according to an analysis of long-term moored observations. |
format |
Article in Journal/Newspaper |
author |
Brandt, Peter Hahn, Johannes Schmidtko, Sunke Tuchen, Franz Philip Kopte, Robert Kiko, Rainer Bourles, Bernard Czeschel, Rena Dengler, Marcus |
spellingShingle |
Brandt, Peter Hahn, Johannes Schmidtko, Sunke Tuchen, Franz Philip Kopte, Robert Kiko, Rainer Bourles, Bernard Czeschel, Rena Dengler, Marcus Atlantic Equatorial Undercurrent intensification counteracts warming-induced deoxygenation |
author_facet |
Brandt, Peter Hahn, Johannes Schmidtko, Sunke Tuchen, Franz Philip Kopte, Robert Kiko, Rainer Bourles, Bernard Czeschel, Rena Dengler, Marcus |
author_sort |
Brandt, Peter |
title |
Atlantic Equatorial Undercurrent intensification counteracts warming-induced deoxygenation |
title_short |
Atlantic Equatorial Undercurrent intensification counteracts warming-induced deoxygenation |
title_full |
Atlantic Equatorial Undercurrent intensification counteracts warming-induced deoxygenation |
title_fullStr |
Atlantic Equatorial Undercurrent intensification counteracts warming-induced deoxygenation |
title_full_unstemmed |
Atlantic Equatorial Undercurrent intensification counteracts warming-induced deoxygenation |
title_sort |
atlantic equatorial undercurrent intensification counteracts warming-induced deoxygenation |
publisher |
Nature Research |
publishDate |
2021 |
url |
https://archimer.ifremer.fr/doc/00882/99403/109496.pdf https://doi.org/10.1038/s41561-021-00716-1 https://archimer.ifremer.fr/doc/00882/99403/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Nature Geoscience (1752-0894) (Nature Research), 2021-05 , Vol. 14 , N. 5 , P. 278-282 |
op_relation |
info:eu-repo/grantAgreement/EC/H2020/817578/EU//TRIATLAS https://archimer.ifremer.fr/doc/00882/99403/109496.pdf doi:10.1038/s41561-021-00716-1 https://archimer.ifremer.fr/doc/00882/99403/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1038/s41561-021-00716-1 |
container_title |
Nature Geoscience |
container_volume |
14 |
container_issue |
5 |
container_start_page |
278 |
op_container_end_page |
282 |
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1796947909608996864 |