Name: Processed underway Thermosalinograph (TSG) observations from the Marion Island Relief Voyage on SA Agulhas II Voyage 057, April 2023
License: https://creativecommons.org/licenses/by-sa/4.0/

DOI: 10.15493/DEA.MIMS.13562023

Title	Processed underway Thermosalinograph (TSG) observations from the Marion Island Relief Voyage on SA Agulhas II Voyage 057, April 2023
Project	Marion Island Relief Voyage
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 April 2023 and 18 May 2023 during the Marion Island Relief Voyage on the SA Agulhas II Voyage 057. 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 April 2023 and 18 May 2023. Data was collected in the southern part of the Benguela Current Large Marine Ecosystem (BCLME) region; the Agulhas Current Large Marine Ecosystem (ACLME) and Southern Ocean. 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) Cite 10.15493/DEA.MIMS.13562023 Style Terms of use These data are made available with the express understanding that any such use will properly acknowledge the originator(s) and publisher and cite the accession numbers and/or associated Digital Object Identifiers. Anyone wishing to use these data should properly cite and attribute the data providers listed as authors in the metadata provided with each dataset. It is expected that all the conditions of the data license will be strictly honoured. Use of any material herein should be properly cited using the dataset’s persistent identifiers such as accession numbers and DOIs. I agree to the terms of use
Temporal extent	16 Apr 2023 – 18 May 2023
Geographic extent	Benguela Current Large Marine Ecosystem (BLMCE), Agulhas Current Large Marine Ecosystem (ACLME) North: -32.0 South: -50.0 West: 17.0 East: 40.0
Vertical extent	Max: -5.0 m Min: -5.0 m
Keywords	INDIAN OCEAN, SA Agulhas II, SA Agulhas II 057, SOUTH ATLANTIC OCEAN, THERMOSALINOGRAPH, TSG
Related resources	This digital object is new version of Raw underway Thermosalinograph (TSG) observations from the Marion Island Relief Voyage on SA Agulhas II Voyage 057, April 2023 (10.15493/DEA.MIMS.13572023) This digital object is part of Marion Island Relief Voyage on the SA Agulhas II Voyage 057, May 2023 (10.15493/DEA.MIMS.11232023)

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