Name: Raw underway Thermosalinograph (TSG) observations from the Southern Ocean Seasonal Experiment 2022 on the SA Agulhas II Voyage 053, July 2022
License: https://creativecommons.org/licenses/by-sa/4.0/

DOI: 10.15493/DEA.MIMS.09992023

Title	Raw underway Thermosalinograph (TSG) observations from the Southern Ocean Seasonal Experiment 2022 on the SA Agulhas II Voyage 053, July 2022
Authors	Franklin Frantz Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Research Assistant; contact details: email: FFrantz@dffe.gov.za Darrell Anders Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientific Technician; contact details: email: DAnders@dffe.gov.za 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: leon5134@gmail.com
Abstract	Here we present the 6-second resolution raw Thermosalinograph (TSG) data collected between 12 July and 30 July 2022 on the SA Agulhas II Voyage 053. 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). This cruise was included as a final component of the SCALE programme (Southern oCean seAsonaL Experiment, https://scale.org.za), a bottom-up endeavour of the SA scientific community to address the limited multidisciplinary knowledge on the seasonal cycle of the Southern Ocean. The seasonal cycle is an important mode of variability that couples the physical mechanisms of climate forcing to ecosystem response in phytoplankton diversity, primary production, and carbon export. Model simulations of the Southern Hemisphere tend to misestimate the magnitude and miss the timing of the Southern Ocean seasonal cycle both in terms of the seasonality of surface ocean warming and cooling, sea ice advancement/retreat, carbon dioxide exchanges and simulated primary production. Our capability to predict the ongoing shifts and future responses is therefore limited. This drives the need for more physical and biogeochemical data sets that address the problem of knowledge and model biases; firstly, to identify them, and secondly to characterise the associated mechanisms that will allow improved projections.
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 12 July and 30 July 2022. Data was collected in the southern part of the Benguela Current Large Marine Ecosystem (BCLME) region and in the Southern Oceans.
Data	Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) Cite 10.15493/DEA.MIMS.09992023 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	12 Jul 2022 – 30 Jul 2022
Geographic extent	Benguela Current Large Marine Ecosystem (BLMCE) and Southern Oceans North: -33.0 South: -62.0 West: 10.0 East: 19.0
Vertical extent	Max: -7.0 m Min: -7.0 m
Keywords	SA Agulhas II, SA Agulhas II 053, SOUTH ATLANTIC OCEAN, SOUTHERN OCEAN, THERMOSALINOGRAPH, TSG
Related resources	This digital object is part of Southern Ocean Seasonal Experiment 2022 (SCALE-WIN22) on the SA Agulhas II Voyage 053, July 2022 (10.15493/DEA.MIMS.09852023) This digital object is previous version of Processed underway Thermosalinograph (TSG) observations from the Southern Ocean Seasonal Experiment 2022 on the SA Agulhas II Voyage 053, July 2022 (10.15493/DEA.MIMS.09982023)

Cite 10.15493/DEA.MIMS.09992023

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