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Fischer, Tim; Banyte, Donata; Brandt, Peter; Dengler, Marcus; Krahmann, Gerd; Tanhua, Toste; Visbeck, Martin (2013): Physical Oceanography in the tropical Atlantic oxygen minimum zone [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.819311, Supplement to: Fischer, T et al. (2013): Diapycnal oxygen supply to the tropical North Atlantic oxygen minimum zone. Biogeosciences, 10(7), 5079-5093, https://doi.org/10.5194/bg-10-5079-2013

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Published: 2013-09-13 • DOI registered: 2013-10-11

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Abstract:
The replenishment of consumed oxygen in the open ocean oxygen minimum zone (OMZ) off northwest Africa is accomplished by oxygen transport across and along density surfaces, i.e. diapycnal and isopycnal oxygen supply. Here the diapycnal oxygen supply is investigated using a large observational set of oxygen profiles and diapycnal mixing data from years 2008 to 2010. Diapycnal mixing is inferred from different sources: (i) a large-scale tracer release experiment, (ii) microstructure profiles, and (iii) shipboard?acoustic current measurements plus density profiles. From these measurements, the average diapycnal diffusivity in the studied depth interval from 150 to 500m is estimated to be 1×10**-5 m2 s**-1, with lower and upper 95% confidence limits of 0.8×10**-5 m2 s**-1 and 1.4×10**-5 m2 s**-1. Diapycnal diffusivity in this depth range is predominantly caused by turbulence, and shows no significant vertical gradient. Diapycnal mixing is found to contribute substantially to the oxygen supply of the OMZ. Within the OMZ core, 1.5 µmol kg**-1 yr**-1 of oxygen is supplied via diapycnal mixing, contributing about one-third of the total demand. This oxygen which is supplied via diapycnal mixing originates from oxygen that has been laterally supplied within the upper CentralWater layer above the OMZ, and within the Antarctic Intermediate Water layer below the OMZ. Due to the existence of a separate shallow oxygen minimum at about 100m depth throughout most of the study area, there is no net vertical oxygen flux from the surface layer into the Central Water layer. Thus all oxygen supply of the OMZ is associated with remote pathways.
Project(s):
Climate - Biogeochemistry Interactions in the Tropical Ocean (SFB754)
Funding:
German Research Foundation (DFG), grant/award no. 27542298: Climate - Biogeochemistry Interactions in the Tropical Ocean
Coverage:
Median Latitude: 9.975387 * Median Longitude: -21.866448 * South-bound Latitude: -5.000000 * West-bound Longitude: -31.089800 * North-bound Latitude: 33.219440 * East-bound Longitude: 28.009500
Date/Time Start: 2008-02-05T15:16:00 * Date/Time End: 2010-11-12T11:03:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
18 datasets

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Datasets listed in this publication series

  1. Krahmann, G (2012): Physical oceanography during L'Atalante cruise ATA_IFMGEOMAR-4. https://doi.org/10.1594/PANGAEA.775387
  2. Krahmann, G (2014): Physical oceanography during L'Atalante cruise ATA_IFMGEOMAR-4. https://doi.org/10.1594/PANGAEA.834325
  3. Krahmann, G (2012): Physical oceanography during L'Atalante cruise ATA03. https://doi.org/10.1594/PANGAEA.777921
  4. Krahmann, G (2012): Physical oceanography during METEOR cruise M80/1. https://doi.org/10.1594/PANGAEA.777865
  5. Krahmann, G (2014): Physical oceanography during METEOR cruise M80/1. https://doi.org/10.1594/PANGAEA.834424
  6. Fischer, T (2013): ADCP current measurements during METEOR cruise M80/2. https://doi.org/10.1594/PANGAEA.819308
  7. Fischer, T (2013): Microstructure Measurements during METEOR cruise M80/2. https://doi.org/10.1594/PANGAEA.819220
  8. Fischer, T (2022): Microstructure Measurements during METEOR cruise M80/2. https://doi.org/10.1594/PANGAEA.946570
  9. Krahmann, G (2012): Physical oceanography during METEOR cruise M80/2. https://doi.org/10.1594/PANGAEA.778359
  10. Krahmann, G (2014): Physical oceanography during METEOR cruise M80/2. https://doi.org/10.1594/PANGAEA.834442
  11. Fischer, T (2013): ADCP current measurements during METEOR cruise M83/1. https://doi.org/10.1594/PANGAEA.819310
  12. Fischer, T (2013): Microstructure Measurements during METEOR cruise M83/1. https://doi.org/10.1594/PANGAEA.819235
  13. Krahmann, G (2012): Physical oceanography during METEOR cruise M83/1. https://doi.org/10.1594/PANGAEA.782529
  14. Krahmann, G (2014): Physical oceanography during METEOR cruise M83/1. https://doi.org/10.1594/PANGAEA.834459
  15. Krahmann, G (2012): Physical oceanography during Maria S. Merian cruise MSM08/1. https://doi.org/10.1594/PANGAEA.774702
  16. Krahmann, G (2012): Physical oceanography during Maria S. Merian cruise MSM10/1. https://doi.org/10.1594/PANGAEA.774713
  17. Fischer, T (2013): ADCP current measurements during Maria S. Merian cruise MSM10/1. https://doi.org/10.1594/PANGAEA.819279
  18. Fischer, T (2013): Microstructure Measurements during Maria S. Merian cruise MSM10/1. https://doi.org/10.1594/PANGAEA.819221