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Hahn, Johannes; Brandt, Peter; Greatbatch, Richard J; Krahmann, Gerd; Körtzinger, Arne (2015): Oxygen variance and meridional oxygen supply in the Tropical North East Atlantic oxygen minimum zone. PANGAEA, https://doi.org/10.1594/PANGAEA.843317, Supplement to: Hahn, J et al. (2014): Oxygen variance and meridional oxygen supply in the Tropical North East Atlantic oxygen minimum zone. Climate Dynamics, 43(11), 2999-3024, https://doi.org/10.1007/s00382-014-2065-0

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Abstract:
The distribution of the mean oceanic oxygen concentration results from a balance between ventilation and consumption. In the eastern tropical Pacific and Atlantic, this balance creates extended oxygen minimum zones (OMZ) at intermediate depth. Here, we analyze hydrographic and velocity data from shipboard and moored observations, which were taken along the 23°W meridian cutting through the Tropical North East Atlantic (TNEA) OMZ, to study the distribution and generation of oxygen variability. By applying the extended Osborn-Cox model, the respective role of mesoscale stirring and diapycnal mixing in producing enhanced oxygen variability, found at the southern and upper boundary of the OMZ, is quantified. From the well-ventilated equatorial region toward the OMZ core a northward eddy-driven oxygen flux is observed whose divergence corresponds to an oxygen supply of about 2.4 µmol kg-1 year-1 at the OMZ core depth. Above the OMZ core, mesoscale eddies act to redistribute low- and high-oxygen waters associated with westward and eastward currents, respectively. Here, absolute values of the local oxygen supply >10 mmol kg-1 year-1 are found, likely balanced by mean zonal advection. Combining our results with recent studies, a refined oxygen budget for the TNEA OMZ is derived. Eddy-driven meridional oxygen supply contributes more than 50 % of the supply required to balance the estimated oxygen consumption. The oxygen tendency in the OMZ, as given by the multidecadal oxygen decline, is maximum slightly above the OMZ core and represents a substantial imbalance of the oxygen budget reaching about 20 % of the magnitude of the eddy-driven oxygen supply.
Related to:
Krahmann, Gerd (2012): Physical oceanography during Maria S. Merian cruise MSM08/1. IFM-GEOMAR Leibniz-Institute of Marine Sciences, Kiel University, PANGAEA, https://doi.org/10.1594/PANGAEA.774702
Krahmann, Gerd (2012): Physical oceanography during Maria S. Merian cruise MSM10/1. IFM-GEOMAR Leibniz-Institute of Marine Sciences, Kiel University, PANGAEA, https://doi.org/10.1594/PANGAEA.774713
Krahmann, Gerd (2014): Physical oceanography during L'Atalante cruise ATA_IFMGEOMAR-4. IFM-GEOMAR Leibniz-Institute of Marine Sciences, Kiel University, PANGAEA, https://doi.org/10.1594/PANGAEA.834325
Krahmann, Gerd; Funk, Andreas (2014): Physical oceanography during Maria S. Merian cruise MSM18/2. IFM-GEOMAR Leibniz-Institute of Marine Sciences, Kiel University, PANGAEA, https://doi.org/10.1594/PANGAEA.834580
Funding:
German Science Foundation (DFG), grant/award no. 27542298: Climate - Biogeochemistry Interactions in the Tropical Ocean
Coverage:
Median Latitude: 4.732079 * Median Longitude: -23.017379 * South-bound Latitude: 0.000000 * West-bound Longitude: -23.114000 * North-bound Latitude: 8.017667 * East-bound Longitude: -22.966660
Date/Time Start: 2006-07-03T12:00:00 * Date/Time End: 2012-10-30T14:10:00
Size:
25 datasets

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Datasets listed in this publication series

  1. Hahn, J (2015): Optode oxygen from mooring KPO_1023. https://doi.org/10.1594/PANGAEA.843539
  2. Funk, A; Hahn, J (2015): Physical oceanography from mooring KPO_1023. https://doi.org/10.1594/PANGAEA.843744
  3. Funk, A; Hahn, J (2015): ADCP current measurements from mooring KPO_1005. https://doi.org/10.1594/PANGAEA.843767
  4. Hahn, J (2015): Optode oxygen from mooring KPO_1025. https://doi.org/10.1594/PANGAEA.843540
  5. Funk, A; Hahn, J (2015): Physical oceanography from mooring KPO_1025. https://doi.org/10.1594/PANGAEA.843745
  6. Hahn, J (2015): Physical oceanography (microcat) from mooring KPO_1044. https://doi.org/10.1594/PANGAEA.843569
  7. Hahn, J (2015): Physical oceanography from mooring KPO_1044. https://doi.org/10.1594/PANGAEA.843499
  8. Hahn, J (2015): Optode oxygen from mooring KPO_1044. https://doi.org/10.1594/PANGAEA.843549
  9. Hahn, J; Funk, A (2015): ADCP current measurements from mooring KPO_1047. https://doi.org/10.1594/PANGAEA.846093
  10. Hahn, J (2015): Physical oceanography (microcat) from mooring KPO_1047. https://doi.org/10.1594/PANGAEA.843603
  11. Hahn, J (2015): Physical oceanography from mooring KPO_1047. https://doi.org/10.1594/PANGAEA.843498
  12. Hahn, J (2015): Optode oxygen from mooring KPO_1047. https://doi.org/10.1594/PANGAEA.843552
  13. Hahn, J (2015): Physical oceanography (microcat) from mooring KPO_1048. https://doi.org/10.1594/PANGAEA.843731
  14. Hahn, J (2015): Physical oceanography from mooring KPO_1048. https://doi.org/10.1594/PANGAEA.843497
  15. Hahn, J (2015): Optode oxygen from mooring KPO_1048. https://doi.org/10.1594/PANGAEA.843555
  16. Kopte, R; Didwischus, S-H; Brandt, P (2015): ADCP current measurements from mooring KPO_1061. https://doi.org/10.1594/PANGAEA.846032
  17. Hahn, J (2015): Physical oceanography (microcat) from mooring KPO_1061 lower instruments. https://doi.org/10.1594/PANGAEA.843917
  18. Hahn, J (2015): Physical oceanography from mooring KPO_1061. https://doi.org/10.1594/PANGAEA.843496
  19. Hahn, J (2015): Optode oxygen from mooring KPO_1061. https://doi.org/10.1594/PANGAEA.843601
  20. Hahn, J (2015): Physical oceanography (microcat) from mooring KPO_1061 upper instruments. https://doi.org/10.1594/PANGAEA.843855
  21. Kopte, R; Didwischus, S-H; Brandt, P (2015): ADCP current measurements from mooring KPO_1062. https://doi.org/10.1594/PANGAEA.846033
  22. Hahn, J (2015): Physical oceanography (microcat) from mooring KPO_1062 lower instruments. https://doi.org/10.1594/PANGAEA.843918
  23. Hahn, J (2015): Physical oceanography from mooring KPO_1062. https://doi.org/10.1594/PANGAEA.843318
  24. Hahn, J (2015): Optode oxygen from mooring KPO_1062. https://doi.org/10.1594/PANGAEA.843320
  25. Hahn, J (2015): Physical oceanography (microcat) from mooring KPO_1062 upper instruments. https://doi.org/10.1594/PANGAEA.843919