Cited by 90Marine and coastal ecosystemsOceanographic and Atmospheric ProcessesMarine Biology and Ecology Research

Changes in the ventilation of the oxygen minimum zone of the tropical North Atlantic.

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Brandt, Peter, Hormann, Verena, Körtzinger, Arne, Visbeck, Martin, Krahmann, Gerd, Stramma, Lothar, Lumpkin, Rick, Schmid, Claudia·2010·Journal of Physical Oceanography

Abstract

Changes in the ventilation of the oxygen minimum zone (OMZ) of the tropical North Atlantic are studied using oceanographic data from 18 research cruises carried out between 28.5° and 23°W during 1999–2008 as well as historical data referring to the period 1972–85. In the core of the OMZ at about 400-m depth, a highly significant oxygen decrease of about 15 μmol kg−1 is found between the two periods. During the same time interval, the salinity at the oxygen minimum increased by about 0.1. Above the core of the OMZ, within the central water layer, oxygen decreased too, but salinity changed only slightly or even decreased. The scatter in the local oxygen–salinity relations decreased from the earlier to the later period suggesting a reduced filamentation due to mesoscale eddies and/or zonal jets acting on the background gradients. Here it is suggested that latitudinally alternating zonal jets with observed amplitudes of a few centimeters per second in the depth range of the OMZ contribute to the ventilation of the OMZ. A conceptual model of the ventilation of the OMZ is used to corroborate the hypothesis that changes in the strength of zonal jets affect mean oxygen levels in the OMZ. According to the model, a weakening of zonal jets, which is in general agreement with observed hydrographic evidences, is associated with a reduction of the mean oxygen levels that could significantly contribute to the observed deoxygenation of the North Atlantic OMZ.

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Registry

Crossref · 10.1175/2010jpo4301.1

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48 of 48 references verified0 citation errors · 0 not checkable

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  • In addition to vertical mixing and lateral eddy fluxes, latitudinally alternating zonal jets play a dominant role in the ventilation of the Atlantic OMZs.

    “In addition to vertical mixing and lateral eddy fluxes (Fischer et al., 2013;Hahn et al., 2014), latitudinally alternating zonal jets play a dominant role in the ventilation of the Atlantic OMZs (Brandt et al., 2010(Brandt et al., , 2012)).”

    From The tropical atlantic observing system (2019) · cites this paper as Brandt et al., 2010

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Authors
Brandt, P., Hormann, V., Körtzinger, A., Visbeck, M., Krahmann, G., Stramma, L., Lumpkin, R., & Schmid, C.
Affiliations
  • GEOMAR Helmholtz Centre for Ocean Research Kiel (DE)
  • National Oceanic and Atmospheric Administration (US)
Venue
Journal of Physical Oceanography
Published
2010-08-01
Volume
40
Issue
8
Pages
1784-1801
ISSN
  • 0022-3670 (ISSN-L)
  • 1520-0485
OpenAlex
W2021360500
Cited by
89
References
51
Citations by year
2026: 4 · 2025: 6 · 2024: 8 · 2023: 3 · 2022: 2 · 2021: 10 · 2020: 3 · 2019: 9 · 2018: 10 · 2017: 4 · 2016: 4 · 2015: 4 · 2014: 4 · 2013: 8 · 2012: 6
FWCI
4.48
Type
journal article
Language
en
Open access
Licence
other-oa
Locations
  • Journal of Physical Oceanography (publishedVersion)
  • Helmholtz Centre for Ocean Research Kiel (GEOMAR) (acceptedVersion, other-oa)
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, tropical North Atlantic, ocean ventilation, deoxygenation, zonal jets, mesoscale eddies, ocean deoxygenation

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