Oxygen in the Tropical Atlantic Ventilation, Respiration, and Overturning Circulation - Cruise No. M106 - April 19 - May 26, 2014 - Mindelo (Cape Verde) - Fortaleza (Brazil)

Freier Zugriff


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    49 pages
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    Elektronische Ressource
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    DDC:    550 Earth sciences and geology


R/V METEOR cruise M106 was a joint effort of the Kiel Collaborative Research Centre SFB 754 ("Climate - Biogeochemistry Interactions in the Tropical Ocean") involving the BMBF joint projects RACE and SOPRAN as well as of the German-French-African Cooperative Project AWA. The main goal within the framework of the SFB 754 was the quantification of oxygen supply to the oxygen minimum zone (OMZ) of the Eastern Tropical North Atlantic (ETNA). Ventilation processes to be investigated include lateral and vertical mixing and oxygen advection (SP A3 and A4). The role of zooplankton and particles for oxygen consumption and biogeochemical cycles (SP B8) was another focus of this cruise. All planned hydrographic and current data were acquired as planned, including the successful recovery of all moorings with an above-average data gain. At the equator, the cruise additionally focussed on the equatorial current system, its interannual to decadal variability and its role in the zonal transport of heat, freshwater, and oxygen (BMBF RACE, SFB 754). The long-term mooring at the equator, at 23°W was successfully recovered and redeployed. At the western boundary of the South Atlantic off Brazil, a special focus was placed on the transport variability of the North Brazil Undercurrent (NBUC) and the Deep Western Boundary Current (DWBC) - as part of the meridional overturning circulation (AMOC) - on timescales from intraseasonal to decadal. The mooring array at 11°S at the shelf and continental slope off the Brazilian coast, deployed in July 2013, was successfully recovered and redeployed. The boundary current system was surveyed with two high-resolution hydrographic sections (CTD/LADCP, shipboard ADCP) at 5°S and 11°S off Brazil.