e85a9312-8531-4261-a2f6-1c58f40cfc71 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 2022-09-27 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 Antarctic krill (Euphausia superba) biomass density estimates derived from acoustic backscatter data collected in the Western Core Box survey, South Georgia, South Atlantic: 1996 - 2019 2022-09-27 creation 2022-09-27 revision 2022-09-27 publication 2022-09-27 released 1.0 https://doi.org/10.5285/e85a9312-8531-4261-a2f6-1c58f40cfc71 doi GB/NERC/BAS/PDC/01671 https://data.bas.ac.uk/ Please cite this item as: Fielding, S., Enderlein, P., Stowasser, G., Tarling, G., & Manno, C. (2022). Antarctic krill (Euphausia superba) biomass density estimates derived from acoustic backscatter data collected in the Western Core Box survey, South Georgia, South Atlantic: 1996 - 2019 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/e85a9312-8531-4261-a2f6-1c58f40cfc71 This dataset contains processed acoustic backscatter data that reflect integrated density estimates for Antarctic krill (Euphausia superba). The acoustic backscatter data are from the Western Core Box (WCB), comprising 8 acoustic transects that span the shelf-break at South Georgia. The data were obtained from a time series of 22 cruises carried out between 1996/97 and 2019/20. Data were collected using either a Simrad EK500 or EK60 echo sounder by biological oceanographers working at the British Antarctic Survey under the Ecosystems scientific research programme and predecessor Discovery 2010 and Dynamo research programmes. Funding was provided by the NERC/BAS Antarctic, Logistic, Infrastructure (ALI) Science and predecessor Long Term Monitoring Science research programmes. No credit. completed Fielding, Sophie British Antarctic Survey Researcher author Enderlein, Peter British Antarctic Survey Researcher author Stowasser, Gabriele British Antarctic Survey Researcher author Tarling, Geraint A. British Antarctic Survey Researcher author Manno, Clara British Antarctic Survey 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 Acoustics > Acoustic Scattering EARTH SCIENCE > Oceans > Marine Environment Monitoring 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 Acoustic backscatter Antarctic krill EK500 EK60 Euphausia superba Scotia Sea South Georgia WCB Western Core Box theme Scotia Sea Southern Ocean 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 Data are released under Open Government Licence V3.0: otherRestrictions No restrictions apply. url url crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference url url crossReference url url crossReference url url crossReference textTable eng utf8 biota environment oceans -39.60605 -37.59114 -54.06044 -53.14326 1996-12-29 2019-12-07 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/plain text/csv bytes 2010112 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e85a9312-8531-4261-a2f6-1c58f40cfc71 WWW:LINK-1.0-http--link Get Data Download data download bytes 2010112 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e85a9312-8531-4261-a2f6-1c58f40cfc71 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Acoustic surveys targeting Antarctic krill (Euphausia superba) within the Western Core Box (WCB; an area covering 132 km by 80 km) to the northwest of South Georgia have been described previously (Trathan et al., 2003; Reid et al., 2010; Fielding et al., 2014). Here we extend the time series from 1997 to 2020, using only acoustic surveys that took place within a fixed time window (1 December to 16 February), given that known intra-annual variation in the timing of peak summer biomass can affect estimates of krill mean density at South Georgia (Saunders et al., 2007; Reid et al., 2010). The WCB includes on-shelf and off-shelf areas sometimes used by predators foraging from Bird Island. During each survey, acoustic data were collected along eight transects, although in some years not all transects could be completed. Also, the location of some transects changed after the first few years. Acoustic data were depth integrated to 250 m (or to 2 m above the sea floor if shallower) with a horizontal average integration distance of 500 m. Estimate of krill density in each acoustic sampling interval were derived using the 3 frequency (38, 120 and 200 kHz) identification model and the ASAM TS model (Fielding et al., 2011; 2014; 2016). asNeeded completed