01f26c07-ea6c-4d89-893e-d86247874e78 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 2020-05-11 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 Ice surface, ice base and lake bed elevation data from seismic data acquired over Subglacial Lake Ellsworth 2007-08 2020-05-11 creation 2020-05-11 revision 2020-05-11 publication 2020-05-11 released 1.0 https://doi.org/10.5285/01f26c07-ea6c-4d89-893e-d86247874e78 doi GB/NERC/BAS/PDC/01330 https://data.bas.ac.uk/ NE/D009200/1 award NE/D008638/1 award NE/D008751/1 award Please cite this item as: Smith, A., Woodward, J., & Ross, N. (2020). Ice surface, ice base and lake bed elevation data from seismic data acquired over Subglacial Lake Ellsworth 2007-08 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/01f26c07-ea6c-4d89-893e-d86247874e78 Point data measurements of ice surface, ice base and lake bed elevation are given from Subglacial Lake Ellsworth (SLE), West Antarctica. The data were acquired during the austral summer of 2007-2008. Five seismic reflection lines were acquired over SLE, with surface elevation determined by dual frequency GPS. Funding was provided by NERC AFI, award numbers NE/D009200/1, NE/D008638/1 and NE/D008751/1. Logistics support: British Antarctic Survey. Equipment support: NERC Geophysical Equipment Facility (loan numbers 838 and 870). No credit. completed Smith, Andrew British Antarctic Survey Researcher author Woodward, John University of Northumbria Researcher author Ross, Neil Newcastle University 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 > Cryosphere > Glaciers/Ice Sheets > Glacier Elevation/Ice Sheet Elevation EARTH SCIENCE > Land Surface > Topography > Terrain Elevation EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets 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 Subglacial Lake Ellsworth West Antarctica lake-bed elevation seismic theme Ellsworth Subglacial Lake (better known as Subglacial Lake Ellsworth) Antarctica place Elevation Land cover 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 This data is governed by the NERC Data Policy: https://www.ukri.org/who-we-are/nerc/our-policies-and-standards/nerc-data-policy/ otherRestrictions These data are governed by the NERC data policy and supplied under Open Government Licence v3.0 otherRestrictions No restrictions apply. doi doi crossReference doi doi crossReference url url crossReference doi doi crossReference doi doi crossReference textTable eng utf8 elevation environment geoscientificInformation -91.0 -90.0 -79.1 -78.8 2007-11-01 2008-02-29 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 52429 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=01f26c07-ea6c-4d89-893e-d86247874e78 WWW:LINK-1.0-http--link Get Data Download data download bytes 52429 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=01f26c07-ea6c-4d89-893e-d86247874e78 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Five seismic reflection profiles were acquired. The seismic source was 450 g explosives at 30 m depth. Shot spacing was 240 m, number of channels was 48 and geophone spacing was 10 m, resulting in single-fold data. Data processing included normal moveout correction, and migration. Ice-water and water-bed interface reflections were picked from stacked seismic sections. Depth conversion used a travel-time correction for the upper snow and firn, and standard ice- and water-column velocities. Full details of data acquisition and processing are given in: Woodward, J., A. M. Smith, N. Ross, M. Thoma, H. F. J. Corr, E. C. King, M. A. King, K. Grosfeld, M. Tranter, M. J. Siegert, 2010. Location for direct access to subglacial Lake Ellsworth: An assessment of geophysical data and modelling. Geophysical Research Letters, doi:10.1029/2010GL042884. Smith, A.M., J. Woodward, N. Ross, M.J. Bentley, D.A. Hodgson, M.J. Siegert, E.C. King, 2018. Evidence for the long-term sedimentary environment in an Antarctic subglacial lake. Earth and Planetary Science Letters, doi:10.1016/j.epsl.2018.10.011. Data collection: Seismic data were acquired with Geometrics Geode seismographs; data processing and picking were done with Landmark ProMAX. Data quality: Data quality are good; the ice-water interface can be clearly picked on virtually all traces, the water-bed interface can be picked in most places, except close to the lake shoreline and at a few other locations on each line. Only the results from traces where both reflections can be picked are provided. Nominal point spacing is 5 m, with occasional gaps at the locations where both reflections could not be picked. Absolute errors in ice- and water-column thickness are 10 m and 1.5 m respectively, although relative thicknesses changes (trace-to-trace) are more precise. See publications for full details. asNeeded completed