d7f0e45e-3132-47d7-936b-a27677c1cb14 eng utf8 dataset dataset NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom polardatacentre@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact 2025-08-27 ISO 19115 Geographic Information - Metadata ISO 19115:2003(E) European Petroleum Survey Group (EPSG) Geodetic Parameter Registry 2008-11-12 publication European Petroleum Survey Group EPSGadministrator@iogp.org https://www.epsg-registry.org/ EPSG Geodetic Parameter Dataset The EPSG Geodetic Parameter Dataset is a structured dataset of Coordinate Reference Systems and Coordinate Transformations, accessible through this online registry. information publisher urn:ogc:def:crs:EPSG::3031 6.18.3 Seabed temperature readings from the South Georgia Patagonian toothfish longline fishery 2025-08-27 creation 2025-08-27 revision 2025-08-27 publication 2025-08-27 released 1.0 https://doi.org/10.5285/d7f0e45e-3132-47d7-936b-a27677c1cb14 doi GB/NERC/BAS/PDC/02084 https://data.bas.ac.uk/ Please cite this item as: Alewijnse, S., Hogg, O., & Readdy, L. (2025). Seabed temperature readings from the South Georgia Patagonian toothfish longline fishery (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/d7f0e45e-3132-47d7-936b-a27677c1cb14 This dataset presents temperature readings collected from the waters around South Georgia in the years 2019, 2021, 2023, and 2024. From 2021 onwards, depth readings are also presented. The data were obtained using temperature loggers affixed to longlines operating in the South Georgia Patagonian toothfish fishery. These in situ measurements were conducted to monitor the water temperatures around South Georgia. The deployment of the temperature loggers was carried out by fishing vessel crew and fisheries observers working on behalf of the Government of South Georgia and the South Sandwich Islands (GSGSSI). The data were collated by the Centre for Environment Fisheries and Aquaculture Science (Cefas). The collection and analysis of this data series was part-funded by the UK Government Blue Belt Programme in partnership with the Government of South Georgia and the South Sandwich Islands. The procurement of some of the temperature loggers was funded by Argos Froyanes Limited. No credit. completed Alewijnse, Sarah R Centre for Environment Fisheries and Aquaculture Science Researcher author Hogg, Oliver T Centre for Environment Fisheries and Aquaculture Science Researcher author Readdy, Lisa Centre for Environment Fisheries and Aquaculture Science Researcher author NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact asNeeded completed EARTH SCIENCE > Oceans > Ocean Temperature > Water Temperature theme Global Change Master Directory (GCMD) Science Keywords 2026-01-27 publication 23 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) Greenbelt MD United States of America https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher South Georgia climate depth temperature toothfish theme South Georgia Southern Ocean place Oceanographic geographical features theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions no limitations to public access otherRestrictions no limitations license Open Government Licence v3.0 otherRestrictions These data are supplied under Open Government Licence v.3 otherRestrictions None. url url crossReference url url largerWorkCitation textTable eng utf8 oceans -50.0 -20.0 -64.0 -50.0 2019-05-01 2019-08-27 It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk. NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information distributor text/csv bytes 538968064 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=d7f0e45e-3132-47d7-936b-a27677c1cb14 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: A licensed commercial longline fishery for Patagonian toothfish (Dissostichus eleginoides) operates in Subarea 48.3 (South Georgia). Since 2016, temperature loggers have been affixed to all longline deployments, subject to availability of serviceable units, to measure the temperature of the waters around South Georgia. Typically a single logger is affixed per longline, however in some instances where vessels were interested in recording the movement of the line, multiple loggers were affixed to a single line. Some idea of where on the longline the logger was positioned is recorded in the 'logger position' column. Longlines are comprised of multiple magazines; sections with ~1000 fishhooks. In 2019, temperature, maximum depth of the set on which the longline was deployed, taken from the logbooks, and pressure were recorded, but since 2021, logger depth has also been used instead of max. depth, and pressure no longer measured. Data from deployments of the temperature loggers have been matched to positional data stored in the South Georgia Data Portal (closed to the public). Data from 2019-2024 are collated here. Data collection: Instrumentation. Data were recorded using the Star Oddi Starmon TD - https://www.star-oddi.com/products/data-loggers/time-depth-recorder-tdr-starmon Data quality: To ensure only in-water temperatures are presented, all data were subset to those measurements taken between the end of the set and the start of the haul. As there is some mismatch between the in-water times in recorded in logbooks and the time on the temperature loggers, further anomalous measurements were removed using a two-stage process: 1. Limits of -1.8°C (the freezing temperature of seawater) and 15°C were used as initial broad cutoffs. 2. Further anomalies were removed using the mean temperature ± 2 times the standard deviation. Where depth data were available, bottom temperature measurements were selected by removing those shallower than the 75th depth quantile for each line. Some missing values (NAs) are present: 2019 - Depth was not recorded, however, pressure was recorded on deployments by one vessel. 2024 - Some logger deployments recorded erroneous depths, so these have been removed resulting in NA. Additionally, data from 2020 are limited due to difficulties with the COVID-19 pandemic which was occurring at the time. Data from 2016-18 and 2022 are still undergoing collation. Where possible these data will be integrated in future updates to this temperature time series. As these data were collected opportunistically, the sampling interval varies across deployments. asNeeded completed