189823ed-6a14-4eba-87fb-38ba3e5e30fb 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 2023-03-17 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 Thwaites Glacier geological map and associated geophysical information. 2023-03-17 creation 2023-03-17 revision 2023-03-17 publication 2023-03-17 released 1.0 https://doi.org/10.5285/189823ed-6a14-4eba-87fb-38ba3e5e30fb doi GB/NERC/BAS/PDC/01720 https://data.bas.ac.uk/ NE/S006621/1 award Please cite this item as: Jordan, T., Thompson, S., Kulessa, B., & Ferraccioli, F. (2023). Thwaites Glacier geological map and associated geophysical information. (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/189823ed-6a14-4eba-87fb-38ba3e5e30fb The geology underlying Thwaites Glacier plays a critical role in mediating ice flow in this region yet is extremely poorly known. Using new compilations of airborne radar, magnetic and gravity data, supported by published geological evidence, we have interpreted the subglacial geology of the Thwaites Glacier region. Here we provide the new data compilations, results of 3D inversions and vector components defining the lithological units on our new geological sketch map. British Antarctic Survey (BAS) National Capability contribution to the International Thwaites Glacier Collaboration (ITGC) (TJ), NERC Grant NE/S006621/1 (Geophysical Habitats of Subglacial Thwaites (Ghost)) (BK), Antarctic Science Collaboration Initiative program (Australian Government) (ST), European Space Agency (ESA) 4D Antarctica project (FF). No credit. completed Jordan, Tom British Antarctic Survey Researcher author Thompson, Sarah University of Tasmania Researcher author Kulessa, Bernd Swansea University Researcher author Ferraccioli, Fausto 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 > Land Surface > Topography > Surface Roughness EARTH SCIENCE > Land Surface > Topography > Terrain Elevation EARTH SCIENCE > Solid Earth > Geodetics/Gravity > Gravity EARTH SCIENCE > Solid Earth > Geomagnetism > Magnetic Field 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 Thwaites glacier basal roughness bed elevation geological map gravity magnetic theme Land cover Geology Elevation 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 Jordan, T.A., Thompson, S., Kulessa, B., & Ferraccioli, F. (2023). Thwaites Glacier geological map and associated geophysical information. (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/189823ED-6A14-4EBA-87FB-38BA3E5E30FB otherRestrictions None doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference url url crossReference doi doi crossReference textTable eng utf8 geoscientificInformation -107.09 -107.09 -75.48 -75.48 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 bytes 413138944 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=189823ed-6a14-4eba-87fb-38ba3e5e30fb WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: This dataset includes three components: Input geophysical compilations, inversion results and interpreted geological boundaries. Details of the data compilation, inversion and basic geological interpretation are presented here. This dataset is the companion to the following paper Jordan et al., (in prep) Geological sketch map and implications for ice flow of Thwaites Glacier, West Antarctica, from integrated aerogeophysical observations, Science Advances., which contains full details of the geological interpretation and should be cited when this dataset is used. Input geophysical compilations: This dataset includes compilations of aerogeophysical data collected across the Thwaites Glacier region of West Antarctica over the past several decades. Surveys used include: AGASEA and BBAS which collected radar, magnetic and gravity data (Diehl et al., 2008; Holt et al., 2006; Jordan et al., 2010; Vaughan et al., 2006). NASA Operation Ice Bridge (OIB) which collected radar and gravity data (Paden et al., 2010, updated 2021; Tinto et al., 2010, updated 2019). The International Thwaites Glacier Collaboration (ITGC) which collected radar, magnetic and gravity data (Jordan et al., 2020a; Jordan and Robinson, 2021a; Jordan and Robinson, 2021b, c; Jordan et al., 2020c). Additional magnetic data was taken from the ADMAP2 compilation (Golynsky et al., 2018). The presented bed-elevation dataset was created from the radar-derived bed elevation picks from the surveys noted above interpolated onto a 2 km mesh raster, padded with gravity derived bathymetry beneath adjacent ice shelves (Jordan et al., 2020b) and BEDMAP2 in more distal areas (Fretwell et al., 2013). All topographic data were corrected to an ellipsoidal reference frame prior to integration. The presented subglacial topographic roughness grid was created from the along track standard deviation of the picked radar bed elevation within a 1 km wide moving window, interpolated onto a 2 km mesh raster. Areas where the bed was poorly resolved, defined as having along-line data gaps more than 50 percent of the analysis window (500 m), were excluded from the gridded product. The presented aeromagnetic compilations were created from line data available through the ADMAP2 project (Golynsky et al., 2018) and incorporating new ITGC data (Jordan et al., 2020a; Jordan and Robinson, 2021c). Data were upward/downward continued to 500 m above the ice/sea surface to place all observations on a common surface prior to reapplication of statistical levelling. After levelling and continuation crossover errors were 18.79 nT. An alternative continuation to 2500 m above the underlying rock was also carried out to give a view of the data with a consistent distance to the closest possible source. The two versions of the final continued line data were interpolated onto a 1 km mesh, and subject to a 3 pass Hanning filter. The presented free air gravity anomalies are from the surveys noted above after detailed data editing and levelling. Note that strictly the presented gravity compilation reflects ''gravity disturbances'', rather than anomalies as they are referenced to the ellipsoid. The line data from ITGC, AGASEA and BBAS were statistically levelled and edited using the OIB dataset as a reference after high altitude (more than 1500 m above ice surface) OIB survey lines had been removed. The line free air data was continued to a uniform level of 2500 m. After levelling and continuation the free air gravity data had an internal crossover error of 2.94 mGal. The line data were interpolated onto a 2 km raster mesh using a minimum curvature method. The presented Bouguer gravity anomaly includes correction for a full 3D model of the gravity effect of the topography, bathymetry and ice, based on the topographic compilation noted above and ice surface elevations taken from the BEDMAP2 (Fretwell et al., 2013). An o...(54) Data quality: See Lineage for data quality of data compilations. asNeeded completed