ba1caf7a-d4e0-4671-972a-e567a25ccd2c 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 2021-05-05 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 Quad-polarimetric ApRES measurements along a 6 km-long transect at the WAIS Divide, December 2019 2021-05-05 creation 2021-05-05 revision 2021-05-05 publication 2021-05-05 released 1.0 https://doi.org/10.5285/ba1caf7a-d4e0-4671-972a-e567a25ccd2c doi GB/NERC/BAS/PDC/01495 https://data.bas.ac.uk/ NE/S006788/1 award Please cite this item as: Young, T., & Dawson, E. (2021). Quad-polarimetric ApRES measurements along a 6 km-long transect at the WAIS Divide, December 2019 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/ba1caf7a-d4e0-4671-972a-e567a25ccd2c Polarimetric phase-sensitive radar measurements were collected at the Western Antarctic Ice Sheet (WAIS) Divide on the 25th and 26th December 2019. The measurements were conducted at 10 sites along a 6 km-long transect ~5-10 km northeast of the location of the WAIS Divide Deep Ice Core. At each site, a suite of four quadrature (quad-) polarimetric measurements were collected using an autonomous phase-sensitive radio echo sounder (ApRES) in a single-input single-output (SISO) configuration. The study is part of the Thwaites Interdisciplinary Margin Evolution (TIME) project of the International Thwaites Glacier Collaboration (ITGC), and is a collaboration between the United States National Science Foundation (NSF) and the United Kingdom Natural Environment Research Council (NERC). It was funded by UK Natural Environment Research Council (NERC) research grant NE/S006788/1 and USA National Science Foundation (NSF) research grant 1739027. No credit. completed Young, Tun Jan Scott Polar Research Institute, University of Cambridge Researcher author Dawson, Eliza Stanford 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 Motion/Ice Sheet Motion EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Topography/Ice Sheet Topography EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets > Glacier Motion/Ice Sheet Motion EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets > Glacier Topography/Ice Sheet Topography EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets EARTH SCIENCE > Spectral/Engineering > Radar 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 ApRES ITGC anisotropy fabric radar radar polarimetry theme West Antarctic Ice Sheet Divide Antarctica place Elevation Hydrography 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 supplied under Open Government Licence v3.0 otherRestrictions No restrictions apply. url url largerWorkCitation url url dependency url url crossReference doi doi crossReference url url crossReference textTable eng utf8 geoscientificInformation -111.9945 -111.8901 -79.43485 -79.38234 2019-12-25 2019-12-26 1780.0 1792.0 urn:ogc:def:crs:EPSG::5714 MSL height Not specific to any location or epoch. Hydrography. 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 image/jpeg application/x-hdf application/netcdf bytes 321493402 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=ba1caf7a-d4e0-4671-972a-e567a25ccd2c WWW:LINK-1.0-http--link Get Data Download data download bytes 321493402 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=ba1caf7a-d4e0-4671-972a-e567a25ccd2c WWW:LINK-1.0-http--link Get Data Download data download bytes 321493402 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=ba1caf7a-d4e0-4671-972a-e567a25ccd2c WWW:LINK-1.0-http--link Get Data Download data download bytes 321493402 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=ba1caf7a-d4e0-4671-972a-e567a25ccd2c WWW:LINK-1.0-http--link Get Data Download data download bytes 321493402 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=ba1caf7a-d4e0-4671-972a-e567a25ccd2c WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: For each site, a suite of four quadrature (quad-) polarimetric measurements were collected using an autonomous phase-sensitive radio echo sounder (ApRES) in a single-input single-output configuration. Each measurement consisted of 100 chirps, with each chirp consisting of a linear sweep from 200 to 400 MHz over the course of 1 second, corresponding to a centre frequency of 300 MHz over a bandwidth of 200 MHz. For each measurement, two open-structure antennas (1 transmitting, 1 receiving) were positioned with their centres 8.00 m apart in combinations of four orthogonal antenna orientations, where antennas were positioned in either a horizontal (h) or vertical (v) alignment with respect to the antenna's electric plane. The four orientation combinations are therefore hh, hv, vv, and vh. Measurements were conducted sequentially, and each antenna pair orientation was established by rotating one or both antennas by 90° with respect to their previous orientations while keeping the position of each antenna centre constant. The antenna plane (parallel to the h orientation; 110°) was oriented perpendicular to the transect line (20°). The complete data collection period at each site, from the start of setup to the conclusion of packing, was ~30 minutes. Data collection: Data collection: SISO autonomous phase-sensitive radio-echo sounder (version dated to 20170925) with 2x open-structure ("skeleton-slot") antennas. Data analysis and processing: MATLAB. Data quality: The coarse-range (amplitude-derived) vertical (depth) resolution of the ApRES is 0.54 m. The azimuthal accuracy is unknown and is mainly the result of human error in alignment of antennas. A nominal azimuthal error of ±8° is assigned. The data included in this dataset are raw data and are entirely unprocessed. asNeeded completed