On the role of circulation and mixing in the ventilation of oxygen minimum zones with a focus on the eastern tropical North Atlantic ...

• Main Authors: Brandt, Peter, Bange, Hermann Werner, Banyte, Donata, Dengler, Marcus, Didwischus, Sven-Helge, Fischer, Tim, Greatbatch, Richard J, Hahn, Johannes
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2016
• Subjects: Climate - Biogeochemistry Interactions in the Tropical Ocean SFB754; Surface Ocean Processes in the Anthropocene SOPRAN; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.860360; https://doi.pangaea.de/10.1594/PANGAEA.860360

Ocean observations carried out in the framework of the Collaborative Research Center 754 (SFB 754) "Climate-Biogeochemistry Interactions in the Tropical Ocean" are used to study (1) the structure of tropical oxygen minimum zones (OMZs), (2) the processes that contribute to the oxygen budget, and (3) long-term changes in the oxygen distribution. The OMZ of the eastern tropical North Atlantic (ETNA), located between the well-ventilated subtropical gyre and the equatorial oxygen maximum, is composed of a deep OMZ at about 400 m depth with its core region centred at about 20° W, 10° N and a shallow OMZ at about 100 m depth with lowest oxygen concentrations in proximity to the coastal upwelling region off Mauritania and Senegal. The oxygen budget of the deep OMZ is given by oxygen consumption mainly balanced by the oxygen supply due to meridional eddy fluxes (about 60%) and vertical mixing (about 20%, locally up to 30%). Advection by zonal jets is crucial for the establishment of the equatorial oxygen maximum. In ... : Supplement to: Brandt, Peter; Bange, Hermann Werner; Banyte, Donata; Dengler, Marcus; Didwischus, Sven-Helge; Fischer, Tim; Greatbatch, Richard J; Hahn, Johannes; Kanzow, Torsten; Karstensen, Johannes; Körtzinger, Arne; Krahmann, Gerd; Schmidtko, Sunke; Stramma, Lothar; Tanhua, Toste; Visbeck, Martin (2015): On the role of circulation and mixing in the ventilation of oxygen minimum zones with a focus on the eastern tropical North Atlantic. Biogeosciences, 12(2), 489-512 ...