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Cited by 38Marine and coastal ecosystemsOceanographic and Atmospheric ProcessesMarine Biology and Ecology Research

Decadal oxygen change in the eastern tropical North Atlantic.

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Hahn, Johannes, Brandt, Peter, Schmidtko, Sunke, Krahmann, Gerd·2017·Ocean Science
DOI 10.5194/os-13-551-2017

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Abstract

Abstract. 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.

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  • Oxygen changes in the tropical North Atlantic during the past decade are most likely associated with changes in the eddy-driven zonal current bands at intermediate depths and a shoaling of the wind-driven thermocline circulation, but other processes may contribute.

    “Oxygen changes in the tropical North Atlantic during the past decade are most likely associated with changes in the eddy-driven zonal current bands at intermediate depths and a shoaling of the wind-driven thermocline circulation, but other processes, such as variations in the intensity of the mesoscale eddy field, may contribute (Hahn et al., 2017).”

    From The tropical atlantic observing system (2019) · cites this paper as Hahn et al., 2017

  • Based on oxygen observations from repeat ship sections in the OMZ of the eastern tropical North Atlantic for the recent decade (2006-2015), Hahn et al. (2017) suggested the existence of strong oxygen variations over this decade superimposed on the multi-decadal deoxygenation pattern.

    “Based on oxygen observations from repeat ship sections in the OMZ of the eastern tropical North Atlantic for the recent decade (2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015), Hahn et al. (2017) suggested the existence of strong oxygen variations over this decade that are superimposed on the multi-decadal deoxygenation pattern (Stramma et al., 2009;Brandt et al., 2015;Santos et al., 2”

    From The tropical atlantic observing system (2019) · cites this paper as Hahn et al., 2017

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Cited by

Sorted by citations

Authors
Hahn, J., Brandt, P., Schmidtko, S., & Krahmann, G.
Affiliations
  • GEOMAR Helmholtz Centre for Ocean Research Kiel (DE)
  • Christian-Albrechts-Universität zu Kiel (DE)
Corresponding author
Hahn, Johannes
ORCID
Venue
Ocean Science
Publisher
Copernicus GmbH
Published
2017-07-06
Volume
13
Issue
4
Pages
551-576
ISSN
  • 1812-0784 (ISSN-L)
  • 1812-0792
DOI
10.5194/os-13-551-2017
OpenAlex
W2568513090
Cited by
38
References
10
Citations by year
2026: 2 · 2025: 1 · 2024: 11 · 2023: 2 · 2022: 3 · 2021: 5 · 2020: 2 · 2019: 7 · 2018: 4 · 2017: 1
FWCI
2.55
Type
journal article
Language
en
Open access
Licence
Locations
  • Ocean science (publishedVersion, cc-by)
  • Helmholtz Centre for Ocean Research Kiel (GEOMAR) (acceptedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
Deutsche Forschungsgemeinschaft
Topics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine Biology and Ecology Research
Keywords
oxygen minimum zone, eastern tropical North Atlantic, ocean ventilation, oxygen budget, zonal advection, mooring observations

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