Name: Processed near-surface underway Thermosalinograph (TSG) observations from the Marion Island Relief Voyage on the SA Agulhas II Voyage 045, May 2021
License: https://creativecommons.org/licenses/by-sa/4.0/legalcode

DOI: 10.15493/DEA.MIMS.01372023

Title	Processed near-surface underway Thermosalinograph (TSG) observations from the Marion Island Relief Voyage on the SA Agulhas II Voyage 045, May 2021
Project	Marion Island Relief Voyage
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 processed Thermosalinograph (TSG) data collected between 09 April 2021 and 12 May 2021 during the 2021 Marion Relief Voyage on the SA Agulhas II Voyage 045. 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 2021 Marion Relief Voyage 045 offered the 9th opportunity to conduct multi-disciplinary, ship-based oceanographic research on board the SA Agulhas II en-route to, from, and around, the sub-Antarctic Prince Edward Islands.
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 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 6 second intervals for the duration of the cruise, between 09 April 2021 to 12 May 2021. 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, in the eastern part of the South Atlantic Ocean, 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 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.01372023 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	09 Apr 2021 – 12 May 2021
Geographic extent	The southern part of the Benguela Current Large Marine Ecosystem (BCLME) region, on the west and south coasts of South Africa; the eastern part of the South Atlantic Ocean, and the Southern Ocean North: -33.0 South: -48.0 West: 17.0 East: 40.0
Vertical extent	Max: -7.0 m Min: -7.0 m
Keywords	SA Agulhas II, SA Agulhas II 045, SOUTH ATLANTIC OCEAN, SOUTHERN OCEAN, THERMOSALINOGRAPH, TSG
Related resources	This digital object is new version of Raw near-surface underway Thermosalinograph (TSG) observations from the Marion Island Relief Voyage on the SA Agulhas II Voyage 045, May 2021 (10.15493/DEA.MIMS.01382023) This digital object is part of Marion Island Relief Voyage on the SA Agulhas II Voyage 045, May 2021 (10.15493/DEA.MIMS.01102023)

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