Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Meteor	M207	04.01.2025 - 11.02.2025	NEXTGEMS	Atlantic Ocean SE Atlantic (Limit 20?W) SW Atlantic (Limit 20W)

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

Ziel der Reise / Objectives of Cruise:

The objectives of R/V METEOR cruise m²07 were to investigate the variability of the western boundary current circulation off South America and to estimate the strength and variability of the Atlantic meridional overturning circulation (AMOC) at 11?S. A specific focus is on the transport variability of the North Brazilian Undercurrent (NBUC) as part of the AMOC and the Subtropical Cells (STCs) and the Deep Western Boundary Current (DWBC) on intraseasonal to decadal time scales. The meridional section along 35?W as well as the mooring maintenance at 23?W at the equator provides additional information with respect to signal propagation along and across the equator. The meteorological program deals with the dynamics of dust outbreaks (aerosols), the climate in the eastern tropical Atlantic and with the dynamics in the main precipitation region of the intertropical convergence zone (ITCZ). The latter investigations also contribute to the EU NextGEMS project as a seasonal addition to the BOWTIE research cruise, which took place in August 2024. The detection of aerosols and the meteorological conditions during dust outbreaks is the first experiment with the new portable meteorological observatory for desert-dust transport (EXPORT) with focus on the trans-Atlantic transport and the deposition of dust. The main work during m²07 with regard to these focal points is the recovery and deployment of deep-sea moorings and station work as well as underway measurements. The combination of CTD, lowered ADCP, UVP and OPUS is mainly used for the station work. In addition, currents are measured underway with the ship's own ADCPs and water mass properties with the thermosalinograph, as well as meteorological underway measurements including wind lidar, ceilometer, radiometer, disdrometer etc. In addition to the underway meteorological measurements, regular radiosonde ascents were made along the meridional sections at 35?W and 23?W. The OSCM is a joint activity of GEOMAR and the Instituto do Mar (IMar) in Mindelo. The establishment of the CVOO is a central component of the monitoring in the region and the cooperation between GEOMAR and Cape Verde. A general goal of this observatory is to better understand the role of eddies in the ocean, especially with regard to the CO2 source/sink function and biological carbon pump in coastal upwelling regions. Specifically with regard to the carbon pump, the CVOO mooring was extended by the "carbon pump extension" and equipped with some additional devices (UVPs). The main work on this cruise with regard to this topic relates to the recovery and deployment of the deep-sea mooring north of Cape Verde (CVOO).

Messungen / Measurements

Verankerungen / Moorings