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Title Long-term observations of daily currents at SAMBA Mooring 9 (October 2020 - September 2022)
Project South Atlantic Meridional Overturning Circulation (SAMOC-SA)
Authors

Lamont, Tarron
Department of Forestry, Fisheries and the Environment; role: Marine Scientist

van den Berg, Marcel
Department of Forestry, Fisheries and the Environment; role: Marine Scientific Technician

Louw, Gavin
Department of Forestry, Fisheries and the Environment; role: Marine Scientific Technician

Publisher Department of Forestry, Fisheries and the Environment (2025)
Contributors

Contact Person: van den Berg, Marcel
Department of Forestry, Fisheries and the Environment; role: Marine Scientific Technician; email: Mvdberg@dffe.gov.za

Abstract Here we present processed magnitude and direction of daily currents in the upper part of the water column (51.80 - 419.80 m) from an ADCP located at a depth of 444m at M9 (34.5032°S; 17.1243°E) along the South Atlantic MOC Basin-scale Array (SAMBA) transect in the Cape Basin region of the South Atlantic Ocean, between 06 October 2020 and 30 September 2022. The South African component of the international South Atlantic Meridional Overturning Circulation project (SAMOC-SA) aims to characterise the time-mean and time-varying components of the SAMOC in the South Atlantic Ocean and monitor the variability of the main Southern Ocean frontal systems associated with the Antarctic Circumpolar Current (ACC), south of Africa.
Methods A subsurface-mounted, upward-looking, 75 kHz RD Instruments Acoustic Doppler Current Profiler (ADCP) was configured with a bin size of 16m and a blanking distance of 7m, and deployed at a depth of 444m at location M9 (34.5032°S; 17.1243°E), along the South Atlantic MOC Basin-scale Array (SAMBA) transect in the Cape Basin region of the South Atlantic Ocean. The instrument measured hourly magnitude and direction in the upper part of the water column (51.80 - 419.80 m) between 06 October 2020 and 30 September 2022. These hourly values were corrected for magnetic declination, and then averaged to daily means for each depth bin. Only hourly values which showed ≥ 75 % good beam data were used, and daily values were only generated for days on which there were 75 % or more hourly readings.
Data
Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
Temporal extent 06 Oct 2020 – 30 Sep 2022
Geographic extent

Cape Basin, South Atlantic Ocean

Lat: -34.5032
Lon: 17.1243

Vertical extent Max: -419.8 m
Min: -51.8 m
Keywords ADCP , currents , moorings , SOUTH ATLANTIC OCEAN
Related resources
  • This digital object continues Long-term observations of daily currents at SAMBA Mooring 9 (October 2018 - October 2020) (10.15493/DEA.MIMS.01642023)
  • This digital object is new version of Raw Acoustic Doppler Current Profiler (ADCP) data from long-term observations of currents at SAMBA Mooring 9 (October 2020 - September 2022) (10.15493/DEA.MIMS.15532023)
  • This digital object is part of Long-term moored observations from the eastern part of the South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) (10.15493/DEA.MIMS.26052050)