Oxygen variability and tropical Atlantic circulation - Cruise No. M119 - September 8 - October 12, 2015 - Mindelo (Cape Verde) - Recife (Brazil)

Freier Zugriff
in METEOR-Berichte; M119; 1-45; METEOR-Berichte

Dokumentinformationen

  • Format / Umfang:
    45 pages
  • ISSN:
  • DOI:
  • Medientyp:
    Aufsatz (Zeitschrift)
  • Format:
    Elektronische Ressource
  • Sprache:
    Englisch
  • Klassifikation:
    DDC:    550 Earth sciences and geology

Abstract

R/V METEOR cruise M119 was a joint effort of the Kiel Collaborative Research Centre SFB 754 ("Climate - Biogeochemistry Interactions in the Tropical Ocean") involving the BMBF joint project RACE and the German-French-African Cooperative Project AWA. The first part of the cruise focused on the oxygen minimum zone (OMZ) of the Eastern Tropical North Atlantic (ETNA). The main goal was the quantification of ventilation processes including lateral and vertical mixing and oxygen advection (SFB SP A3 and A4). Other foci of this cruise were the role of zooplankton and particles for oxygen consumption and biogeochemical cycles (SFB SP B8), the study of epi- and mesopelagic communities of macrozooplankton and micronekton (a project of the Cluster of Excellence "Future Ocean"), and the quantification of N2 fixation. All hydrographic and current data were acquired as planned (with some reduction of the number of CTD stations along 23°W), including the successful recovery of all moorings. At the equator, the cruise additionally focused 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 and 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) on timescales from intraseasonal to decadal (BMBF RACE). The mooring array at 11°S at the continental slope off the Brazilian coast was successfully recovered and redeployed.