Name: Processed underway Thermosalinograph (TSG) observations from the SA Agulhas II Voyage 036, April 2019
License: https://creativecommons.org/licenses/by-sa/4.0/

DOI: 10.15493/dea.mims.25010009

Title	Processed underway Thermosalinograph (TSG) observations from the SA Agulhas II Voyage 036, April 2019
Project	Marion Island Relief Voyage
Authors	Leon Jacobs Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE) Marine Scientific Technician 2nd Floor, Foretrust Building, Martin Hammerschlag Way, Cape Town, South Africa, LJacobs@environment.gov.za Marcel van den Berg Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE) Marine Scientific Technician 2nd Floor, Foretrust Building, Martin Hammerschlag Way, Cape Town, South Africa, mvdberg@environment.gov.za Tarron Lamont Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE) Marine Scientist 2nd Floor, Foretrust Building, Martin Hammerschlag Way, Cape Town, South Africa, tlamont@environment.gov.za
Publisher	Department of Forestry, Fisheries and the Environment (2021)
Contributors	Contact Person: Leon Jacobs Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE) Marine Scientific Technician 2nd Floor, Foretrust Building, Martin Hammerschlag Way, Cape Town, South Africa, leon5134@gmail.com
Abstract	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 10 April 2019 and 14 May 2019, during Voyage 036 on the SA Agulhas II.
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 10 second intervals for the duration of the cruise, between 10 April 2019 and 14 May 2019. 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 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.25010009 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	10 Apr 2019 – 14 May 2019
Geographic extent	Benguela Current Large Marine Ecosystem (BCLME) region, west and south coasts of South Africa, Southern Ocean North: -33.0 South: -50.0 West: 17.0 East: 39.0
Vertical extent	Max: -7.0 m Min: -7.0 m
Keywords	AGU036, conductivity, INDIAN OCEAN, near-surface, SA Agulhas II, SA Agulhas II 036, salinity, SBE45, temperature, THERMOSALINOGRAPH, TSG, underway
Related resources	This digital object is new version of (10.15493/dea.mims.250100010) This digital object is part of Marion Island Relief on the SA Agulhas II Voyage 036, April 2019 (10.15493/dea.mims.26052211)

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