Title Raw underway Thermosalinograph (TSG) observations from the SAMBA Monitoring Line cruise on the Algoa Voyage 275, September 2021
Project South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA)
Authors

Leon Jacobs
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientific Technician; contact details: email: LJacobs@dffe.gov.za

Marcel van den Berg
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientific Technician; contact details: email: mvdberg@dffe.gov.za

Tarron Lamont
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientist; contact details: email: tlamont@dffe.gov.za

Publisher Department of Forestry, Fisheries and the Environment (2023)
Contributors

Contact Person: Leon Jacobs
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientific Technician; contact details: email: LJacobs@dffe.gov.za

Contact Person: Marcel van den Berg
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientific Technician; contact details: email: mvandenberg.dea@gmail.com

Contact Person: Tarron Lamont
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientist; contact details: email: tarron.lamont@gmail.com

Abstract Here we present the 6-second resolution raw Thermosalinograph (TSG) data collected on the Algoa Voyage 275 on the South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) Monitoring Line in the South-East Atlantic Ocean, between 13 September and 3 October 2021. A SeaBird SBE45 Thermosalinograph (TSG) is used to opportunistically collect underway near-surface temperature and conductivity measurements during research and monitoring cruises. Water is continuously pumped to the TSG from an intake located in the hull of the vessel, and the observations are continuously interfaced with navigational information. A temperature sensor close to the intake provides temperature measurements of the incoming water (T1). The temperature of the water inside the conductivity cell (T2) is used to accurately compute salinity (S) from the conductivity measurements (C). The cruise operated from Cape Town towards Slangkop and westwards to 0° E, in an easterly direction in the South Atlantic Ocean along the SAMBA Monitoring Line (34.5°S). The objectives of the cruise were to recover, service and deploy 10 CPIES/PIES on the SAMBA transect; attempt to locate and recover DFFE current meter mooring (M7), that could not be recovered during 2020 cruise; undertake full depth Conductivity, Temperature, Depth (CTD) casts along the SAMBA transect (37 stations) using containerised winch system; undertake chlorophyll, oxygen, nutrient and Dissolved Inorganic Carbon (DIC) sampling at CTD stations and underway along SAMBA transect; collect under-way Thermosalinograph (TSG); Surface Photosynthetically Active Radiation (SPAR) and Ship-mounted Acoustic Doppler Current Profilers (S-ADCP) data and deploy Argo floats and drifters.
Methods The SeaBird SBE45 Thermosalinograph (TSG) is used on the Algoa for the collection of underway near-surface temperature and conductivity measurements. The underway seawater is obtained from a depth of 5m below the surface and pumped through the TSG. Data is collected using the most recent SeaBird (SBE) SeaSave software. The software was set to record data at 6 second intervals for the duration of the cruise, between 13 September 2021 and 03 October 2021. Data was collected in the southern part of the Benguela Current Large Marine Ecosystem (BCLME) region on the west coast of South Africa.
Data
Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
Temporal extent 13 Sep 2021 – 03 Oct 2021
Geographic extent

Benguela Current Large Marine Ecosystem (BLMCE); shelf region on the west coast of South Africa

North: -33.0
South: -35.0
West: -1.0
East: 19.0

Vertical extent Max: -5.0 m
Min: -5.0 m
Keywords Algoa, Algoa 275, SOUTH ATLANTIC OCEAN, THERMOSALINOGRAPH, TSG
Related resources
  • This digital object is part of South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) Monitoring Line cruise on the Algoa Voyage 275, September 2021 (10.15493/DEA.MIMS.01112023)
  • This digital object is previous version of Processed underway Thermosalinograph (TSG) observations from the SAMBA Monitoring Line cruise on the Algoa Voyage 275, September 2021 (10.15493/DEA.MIMS.01192023)