Title Processed underway Thermosalinograph (TSG) observations from the SEAmester III and Agulhas System Climate Array (ASCA) Cruise on SA Agulhas II Voyage 033, July 2018
Project Agulhas System Climate Array (ASCA)
Authors

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

Publisher Department of Forestry, Fisheries and the Environment (2024)
Contributors

Contact Person: Leon Jacobs
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE), South Africa; role: Marine Scientific Technician; contact details: email: leon5134@gmail.com

Abstract Here we present the 6-second resolution processed Thermosalinograph (TSG) data collected between 16 July and 26 July 2018 during the SEAmester III and Agulhas System Climate Array (ASCA) cruise on the SA Agulhas II Voyage 033. A SeaBird SBE45 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).
Methods The SeaBird SBE45 Thermosalinograph (TSG) is used on the SA Agulhas II 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 and processed using the most recent SBE Data Processing software. The software was set to record data at 6 second intervals for the duration of the cruise, between 16 July and 26 July 2018. Data was collected in the southern part of the Benguela Current Large Marine Ecosystem (BCLME) region and in the Agulhas Current Large Marine Ecosystem (ACLME) region. Unreliable TSG measurements can result from a variety of problems encountered during the cruises, including insufficient water flow, extreme air bubbling during severely adverse weather conditions, debris trapped in the system, or a variety of electronic failures. Detailed visual inspection of the ship trajectory and TSG measurements, as well as comparisons with other concurrent and historical near-surface measurements, and expert knowledge of local conditions, were used to identify and remove all unreliable data.
Data
Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
Temporal extent 16 Jul 2018 – 26 Jul 2018
Geographic extent

Benguela Current Large Marine Ecosystem (BLMCE), Agulhas Current Large Marine Ecosystem (ACLME)

North: -33.0
South: -38.0
West: 17.0
East: 30.0

Vertical extent Max: -5.0 m
Min: -5.0 m
Keywords INDIAN OCEAN, SA Agulhas II, SA Agulhas II 033, SOUTH ATLANTIC OCEAN, THERMOSALINOGRAPH, TSG
Related resources
  • This digital object is new version of Raw underway Thermosalinograph (TSG) observations from the SEAmester III and Agulhas System Climate Array (ASCA) Cruise on SA Agulhas II Voyage 033, July 2018 (10.15493/DEA.MIMS.13532023)