Decadal oxygen change in the eastern tropical North Atlantic
Repeat shipboard and multi-year moored observations obtained in the oxygen minimum zone (OMZ) of the eastern tropical North Atlantic (ETNA) were used to study the decadal change in oxygen for the period 2006–2015. Along 23° W between 6 and 14° N, oxygen decreased with a rate of −5.9 ± 3.5 µmol kg −1...
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ftdoajarticles:oai:doaj.org/article:153780c274ec4fd0b8a84924b7a60cb0 2023-05-15T17:30:36+02:00 Decadal oxygen change in the eastern tropical North Atlantic J. Hahn P. Brandt S. Schmidtko G. Krahmann 2017-07-01T00:00:00Z https://doi.org/10.5194/os-13-551-2017 https://doaj.org/article/153780c274ec4fd0b8a84924b7a60cb0 EN eng Copernicus Publications https://www.ocean-sci.net/13/551/2017/os-13-551-2017.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-13-551-2017 1812-0784 1812-0792 https://doaj.org/article/153780c274ec4fd0b8a84924b7a60cb0 Ocean Science, Vol 13, Pp 551-576 (2017) Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2017 ftdoajarticles https://doi.org/10.5194/os-13-551-2017 2022-12-31T09:08:12Z Repeat shipboard and multi-year moored observations obtained in the oxygen minimum zone (OMZ) of the eastern tropical North Atlantic (ETNA) were used to study the decadal change in oxygen for the period 2006–2015. Along 23° W between 6 and 14° N, oxygen decreased with a rate of −5.9 ± 3.5 µmol kg −1 decade −1 within the depth covering the deep oxycline (200–400 m), while below the OMZ core (400–1000 m) oxygen increased by 4.0 ± 1.6 µmol kg −1 decade −1 on average. The inclusion of these decadal oxygen trends in the recently estimated oxygen budget for the ETNA OMZ suggests a weakened ventilation of the upper 400 m, whereas the ventilation strengthened homogeneously below 400 m. The changed ventilation resulted in a shoaling of the ETNA OMZ of −0.03 ± 0.02 kg m −3 decade −1 in density space, which was only partly compensated by a deepening of isopycnal surfaces, thus pointing to a shoaling of the OMZ in depth space as well (−22 ± 17 m decade −1 ). Based on the improved oxygen budget, possible causes for the changed ventilation are analyzed and discussed. Largely ruling out other ventilation processes, the zonal advective oxygen supply stands out as the most probable budget term responsible for the decadal oxygen changes. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Ocean Science 13 4 551 576 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
spellingShingle |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 J. Hahn P. Brandt S. Schmidtko G. Krahmann Decadal oxygen change in the eastern tropical North Atlantic |
topic_facet |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
description |
Repeat shipboard and multi-year moored observations obtained in the oxygen minimum zone (OMZ) of the eastern tropical North Atlantic (ETNA) were used to study the decadal change in oxygen for the period 2006–2015. Along 23° W between 6 and 14° N, oxygen decreased with a rate of −5.9 ± 3.5 µmol kg −1 decade −1 within the depth covering the deep oxycline (200–400 m), while below the OMZ core (400–1000 m) oxygen increased by 4.0 ± 1.6 µmol kg −1 decade −1 on average. The inclusion of these decadal oxygen trends in the recently estimated oxygen budget for the ETNA OMZ suggests a weakened ventilation of the upper 400 m, whereas the ventilation strengthened homogeneously below 400 m. The changed ventilation resulted in a shoaling of the ETNA OMZ of −0.03 ± 0.02 kg m −3 decade −1 in density space, which was only partly compensated by a deepening of isopycnal surfaces, thus pointing to a shoaling of the OMZ in depth space as well (−22 ± 17 m decade −1 ). Based on the improved oxygen budget, possible causes for the changed ventilation are analyzed and discussed. Largely ruling out other ventilation processes, the zonal advective oxygen supply stands out as the most probable budget term responsible for the decadal oxygen changes. |
format |
Article in Journal/Newspaper |
author |
J. Hahn P. Brandt S. Schmidtko G. Krahmann |
author_facet |
J. Hahn P. Brandt S. Schmidtko G. Krahmann |
author_sort |
J. Hahn |
title |
Decadal oxygen change in the eastern tropical North Atlantic |
title_short |
Decadal oxygen change in the eastern tropical North Atlantic |
title_full |
Decadal oxygen change in the eastern tropical North Atlantic |
title_fullStr |
Decadal oxygen change in the eastern tropical North Atlantic |
title_full_unstemmed |
Decadal oxygen change in the eastern tropical North Atlantic |
title_sort |
decadal oxygen change in the eastern tropical north atlantic |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/os-13-551-2017 https://doaj.org/article/153780c274ec4fd0b8a84924b7a60cb0 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Ocean Science, Vol 13, Pp 551-576 (2017) |
op_relation |
https://www.ocean-sci.net/13/551/2017/os-13-551-2017.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-13-551-2017 1812-0784 1812-0792 https://doaj.org/article/153780c274ec4fd0b8a84924b7a60cb0 |
op_doi |
https://doi.org/10.5194/os-13-551-2017 |
container_title |
Ocean Science |
container_volume |
13 |
container_issue |
4 |
container_start_page |
551 |
op_container_end_page |
576 |
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1766127461778587648 |