63bbaf4f-fe53-45a8-b2b5-d41adcf3d35f 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 2019-08-12 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 10Be surface exposure age data from Mt Murphy, Marie Byrd Land, Antarctica 2019-08-12 creation 2019-08-12 revision 2019-08-12 publication 2019-08-12 released 1.0 https://doi.org/10.5285/63bbaf4f-fe53-45a8-b2b5-d41adcf3d35f doi GB/NERC/BAS/PDC/01225 https://data.bas.ac.uk/ NE/K012088/1 award NE/K011278/1 award Please cite this item as: Johnson, J., Roberts, S., Rood, D., Schaefer, J., & Smith, J. (2019). 10Be surface exposure age data from Mt Murphy, Marie Byrd Land, Antarctica (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/63bbaf4f-fe53-45a8-b2b5-d41adcf3d35f This dataset comprises 52 cosmogenic 10Be surface exposure ages and associated analytical data from quartz-bearing rocks from Mount Murphy and surrounding nunataks in Marie Byrd Land, Antarctica. The samples - glacial erratics and bedrock - were collected between 2006 and 2016 by Joanne Johnson, Stephen Roberts and James Smith (British Antarctic Survey), in order to determine timing and duration of ice sheet thinning in the Amundsen Sea sector of the West Antarctic Ice Sheet, specifically thinning of Pope Glacier. The data are published and interpreted in the following paper: Johnson, J.S., Roberts, S.J., Rood, D.H., Pollard, D., Schaefer, J.M., Whitehouse, P.L., Ireland, L.C., Lamp, J.L., in review. Deglaciation of Pope Glacier implies widespread early Holocene ice sheet thinning in the Amundsen Sea sector of Antarctica. Earth & Planetary Science Letters. doi: xxxxx This data forms part of the ANiSEED project ('Amundsen Sea Embayment Exposure Dating'), funded by the Natural Environment Research Council (grants NE/K012088/1 and NE/K011278/1). No credit. completed Johnson, Joanne S. British Antarctic Survey, Natural Environment Research Council, UK Research & Innovation Researcher author Roberts, Stephen J. British Antarctic Survey, Natural Environment Research Council, UK Research & Innovation Researcher author Rood, Dylan H. Imperial College London Researcher author Schaefer, Joerg M. Lamont-Doherty Earth Observatory, Columbia University Researcher author Smith, James A. British Antarctic Survey, Natural Environment Research Council, UK Research & Innovation 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 Thickness/Ice Sheet Thickness EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glaciers EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Ice Sheets EARTH SCIENCE > Paleoclimate > Land Records > Isotopes EARTH SCIENCE > Solid Earth > Geochemistry > Isotopes 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 10Be Antarctica Mount Murphy Pope Glacier exposure age theme central Amundsen Sea Embayment Antarctica Pope Glacier Antarctica Mount Murphy Antarctica Turtle Rock Antarctica Icefall Nunatak Antarctica Dorrel Rock Antarctica Notebook Cliffs Antarctica Kay Peak Antarctica place Elevation Geology 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 This data is governed by the NERC data policy and supplied under Open Government Licence v.3 otherRestrictions No restrictions apply. url url crossReference url url crossReference doi doi crossReference url url dependency url url crossReference textTable eng utf8 climatologyMeteorologyAtmosphere geoscientificInformation -111.3749 -110.9591 -75.4456 -75.2167 2013-01-01 2017-12-31 160.0 893.0 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/csv bytes 7168 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=63bbaf4f-fe53-45a8-b2b5-d41adcf3d35f WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The dataset comprises 52 exposure ages from 3 sets of samples. 3 samples were collected in 2006 by Joanne Johnson (using helicopter support from RV Polarstern cruise ANT-XXXIII-4), and are published in Johnson et al., 2008. They have been recalculated here for consistency. The remaining 49 exposure ages are from samples collected in 2010 (by James Smith using helicopter support from RV Polarstern cruise ANT-XXVII-3) and in 2015-16 by Joanne Johnson and Stephen Roberts (supported by NERC grants NE/K012088/1 and NE/K011278/1). Samples from the surfaces of glacial erratics and bedrock were collected in the field using hand-held rock saw and chisel. These were then prepared at Lamont-Doherty Earth Observatory cosmogenic nuclide laboratory (USA) using procedures developed for high-sensitivity 10Be exposure dating. Analysis of 10Be/9Be ratios in each sample was undertaken by: PRIME lab, Purdue University, USA; the Center for Accelerator Mass Spectrometry (CAMS), Lawrence Livermore National Laboratory, USA; and Scottish Universities Environmental Research Centre (SUERC) AMS Laboratory. 10Be backgrounds were corrected with procedural blanks (a 9Be carrier-only sample that is processed alongside and identically to the samples), that ranged from < 1,000 to ~150,000 total 10Be atoms. Corrections were between <1 % to ~2.5 %. The 10Be exposure ages were then calculated using Version 3 of the online cosmogenic nuclide exposure age calculator hosted at https://hess.ess.washington.edu/. Topographic shielding was determined using the associated online geometric shielding calculator, v. 1.1. Zero erosion and a quartz density of 2.7 g cm-3 were assumed for all age calculations. The 10Be exposure ages in this dataset are reported using the LSDn scaling scheme of Lifton et al., 2014 (doi: 10.1016/j.epsl.2013.10.052), alongside the global 10Be production rate (PGLOBAL). More details on sample processing and exposure age calculations are provided in the referenced publications. Data collection: Software: Version 3 of the online cosmogenic nuclide exposure age calculator hosted at https://hess.ess.washington.edu/. Version 1.1. of the online geometric shielding calculator hosted at https://hess.ess.washington.edu/. asNeeded completed