Processed underway Thermosalinograph (TSG) observations from the SA Agulhas II Voyage 042, April 2020 - May 2020 ...

• Main Authors: Leon Jacobs, Marcel van den Berg, Tarron Lamont
• Format: Dataset
• Language: English
• Published: Department of Forestry, Fisheries and the Environment 2021
• Subjects: -7.0; m; Mean sea level; completed; license; oceans; Marion Island Relief Voyage; INDIAN OCEAN; THERMOSALINOGRAPH; SBE45; Thermosalinograph; TSG; near-surface; temperature; conductivity; salinity; underway; physical oceanography; SA Agulhas II; AGU042; WGS 84; textTable; Indian; Southern Ocean; Marion Island
• Online Access: https://dx.doi.org/10.15493/dea.mims.25010014; https://api.odp.saeon.ac.za/catalog/SAEON/go/10.15493/dea.mims.25010014

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). Here we present the 10-second resolution processed TSG data collected, between 21 April 2020 and 15 May 2020, during Voyage 042 on the SA Agulhas II. ... : 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 7m 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 10 second intervals for the duration of the cruise, between 21 April 2020 and 15 May 2020. Data was collected in the southern part of the Benguela Current Large Marine Ecosystem (BCLME) region, on the west and south coasts of South Africa, and in the Southern Ocean. Unreliable TSG measurements can result from a variety of problems encountered during the cruises, including insufficient water flow, extreme air bubbling during severly adverse weather conditions, debris trapped in the system, or a variety of electronic failures. Detailed visual inspection of the ship trajectory and TSG ...