Mixing and Circulation in the Tropical Atlantic - Cruise No. M98 - July 01 - July 28, 2013 - Fortaleza (Brazil) - Walvis Bay (Namibia) (English)

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Cruise M98 to the southern tropical Atlantic is a joint effort of the BMBF project RACE and the BMBF project SACUS. Both projects have the overarching goal to gain better understanding for the role of the tropical Atlantic in relation to climate variability in the Atlantic region. According to the special issues within the subprojects, this cruise has two major regional focuses: Within the framework of RACE, the aim of this cruise is to investigate the variability of the western boundary current system offshore of South America. A special focus is 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 project SACUS is concerned with the influence of the equatorial Atlantic on the upwelling region off Southwest Africa. This cruise aims at investigating these teleconnections from the equatorial region towards the upwelling system and their attributed time scales via wave propagation and water mass advection. The substantial part of work for this cruise consists of the deployment of two mooring arrays at 11°S at the shelf and continental slope off the Brazilian coast and off the Angolan coast. Additionally, the boundary current systems are surveyed with two high-resolution, hydrographic sections (CTD/LADCP, shipboard ADCP) at 5°S and 11°S off Brazil and a hydrographic section (CTD, microstructure, shipboard ADCP) at 11°S off Angola. In addition, the flux of CO2 and Dimethylsulphide (DMS) between the sea surface and the overlying atmosphere is monitored continuously during the cruise.