Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Meteor	M130	28.08.2016 - 03.10.2016	SFB 754 RACE	Tropical NE Atlantic NW Atlantic (Limit 40?W)

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Dengler Marcus	Helmholtz Centre for Ocean Research Kiel (GEOMAR)	Mindelo	Recife

Ziel der Reise / Objectives of Cruise:

A physical - biogeochemical survey was carried out in the north eastern tropical Atlantic and in the western tropical South Atlantic. The measurement program was an integral component of the DFG Collabrative Research Center (SFB) 754 and the BMBF-joint project "Regional Atlantic Circulation and Global Change" (RACE II). The main objective for the works in the oxygen minimum zone (OMZ) of the eastern tropical North Atlantic (ETNA) is to improve oxygen budget estimates. This includes determining oxygen supply by mean advection, diapycnal and lateral eddy fluxes, and quantifying oxygen consumption. Other objectives were investigating the role of zooplankton and its vertical migration for fluxes of particulate and dissolved matter to the OMZ and advancing quantitative understanding of nitrogen fixation in the tropical Atlantic. Main objectives of the measurements program in the region of the western tropical south Atlantic were to investigate the variability of transport and water mass properties of the western boundary circulation as part of the deep and shallow meridional overturning. A major component of the work program was the recovery of 9 and the redeployment of 8 moorings collecting velocity, oxygen, temperature, and salinity time series. The measurement program included temperature-salinity-depth and oxygen profiles (CTD/O2), lowered acoustic Doppler current profiles (lADCP), underwater vision profiles, shipboard velocity profiles, Multinet casts, and photosynthetically active radiation profiles. Water samples were analysed for numerous variables including tracer concentrations (CFC-12, SF6), nutrients in micro and nano range, and halocarbons. Additionally, filtered samples were taken for NanoSIMS, flow cytometry, dissolved organic phosphorus, DNA/RNA, particulate organic matter, particulate organic nitrogen, and chlorophyll a. Samples of Heme content and dissolved iron were taken from a towed fish. Furthermore, incubations to quantify nitrogen fixation and primary productivity were performed. Due to a delayed arrival of a container in Mindelo, Cape Verde, the cruise started with one day delay. After station work and recovery and redeployment of a mooring at the Cape Verde Ocean Observatory station 50nm to the northwest of Mindelo, a buoy belonging to Dutch colleagues was recovered farther to the North. CTD/O2 section work along 23?W started September 2nd at 15?N. Between 8?N and 11.5?N, 19?W and 23?W, a tracer survey was conducted that was released in the core of the OMZ 3.5 years ago. During the survey, a mooring war recovered and redeployed at 11?S, 21?E. Two more moorings were recovered and redeployed at 5?S and on the equator at 23?W. The 23?W section was finalized at 5.5?S on September 19th. Works in the western tropical Atlantic along the 11?S section started two days later at 11.5?S, 32?W. During the 11?S section work, 4 moorings were recovered and redeployed and the data of two pressure inverted echo sounders were read-out using acoustic modems. The section was completed on September 27th. The final CTD/O2 section at 5?S was started September 29th and completed on October 1st. R/V Meteor arrived as scheduled in Recife at 6:00 in the morning of October 3rd.

Messungen / Measurements

Verankerungen / Moorings