3d6fd5ae-e94d-4d0b-a5e9-5779ca84855e 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 2025-04-03 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 GPS and ApRES data relating to the growth of Chasm-1, Brunt Ice Shelf from 2016 to 2023 2025-04-03 creation 2025-04-03 revision 2025-04-03 publication 2025-04-03 released 1.0 https://doi.org/10.5285/3d6fd5ae-e94d-4d0b-a5e9-5779ca84855e doi GB/NERC/BAS/PDC/02038 https://data.bas.ac.uk/ NE/X014991/1 award Please cite this item as: Marsh, O., & De Rydt, J. (2025). GPS and ApRES data relating to the growth of Chasm-1, Brunt Ice Shelf from 2016 to 2023 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/3d6fd5ae-e94d-4d0b-a5e9-5779ca84855e The dataset consists of GPS data recorded from four sites close to Halley VI Research Station, plus ApRES data across the rift from 2017-2019. Both data types provide information on the width of an active rift propagating through the ice shelf. GPS sites advect with flow of the ice shelf, while ApRES is repositioned each year. The data were collected as part of the Lifetime-of-Halley monitoring programme. This work was funded by NERC grant NE/X014991/1 (RIFT-TIP) and supported by NERC Antarctic Logistics and Infrastructure. No credit. completed Marsh, Oliver British Antarctic Survey Researcher author De Rydt, Jan Northumbria 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 > Hydrosphere > Glaciers/Ice Sheets > Glacier Motion/Ice Sheet Motion 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 GPS Halley VI calving ice shelf velocity theme Brunt Ice Shelf, Halley VI Research Station 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 largerWorkCitation url url largerWorkCitation url url dependency url url dependency url url crossReference doi doi crossReference doi doi crossReference doi doi crossReference textTable eng utf8 inlandWaters oceans -25.7 -25.5 -75.6 -75.4 2016-01-01 2023-02-01 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 application/x-hdf application/netcdf bytes 91268055040 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=3d6fd5ae-e94d-4d0b-a5e9-5779ca84855e WWW:LINK-1.0-http--link Get Data Download data download bytes 91268055040 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=3d6fd5ae-e94d-4d0b-a5e9-5779ca84855e WWW:LINK-1.0-http--link Get Data Download data download bytes 91268055040 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=3d6fd5ae-e94d-4d0b-a5e9-5779ca84855e WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The GPS sites were installed between 2016 and 2017 and recorded for 2 hours 15 minutes each day at 30 second resolution. Data was converted from raw Leica format (*.m00) to standard Rinex v2 format using UNAVCO's teqc.exe program. The ApRES was installed in a horizontal configuration with antennas spaced approximately 15 m apart. A metal reflector was installed on the far side of the crack and the peak in reflection indicates the distance across the crack. The ApRES raw DAT format was converted to ApRES raw netCDF format using the bas-apres software (v0.3.0). Details in Marsh et al., 2024. Data collection: Data collected using Leica GS10 and Leica GX1200 GPS and ApRES. Data quality: Dual frequency Raw GPS data have been converted into 5 minute Rinex files. ApRES is in netCDF format. The GPS data are mostly available for each day, although with some gaps in austral winter (July/August). The ApRES data has a high signal to noise ratio (~30 dB) after initial set-up (i.e. in February and March). This generally decreases through the winter and the signal disappears around September each year. asNeeded completed