ebfbbe88-902b-4c74-9b62-07101d89e509 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 2021-05-13 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-margin change (advance/recession) at the terrestrial, lacustrine and marine margins of the south-western sector of the Greenland Ice Sheet between 1987 and 2015 2021-05-13 creation 2021-05-13 revision 2021-05-13 publication 2021-05-13 released 1.0 https://doi.org/10.5285/ebfbbe88-902b-4c74-9b62-07101d89e509 doi GB/NERC/BAS/PDC/01498 https://data.bas.ac.uk/ Please cite this item as: Mallalieu, J., Carrivick, J., Quincey, D., & Raby, C. (2021). Ice-margin change (advance/recession) at the terrestrial, lacustrine and marine margins of the south-western sector of the Greenland Ice Sheet between 1987 and 2015 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/ebfbbe88-902b-4c74-9b62-07101d89e509 A dataset of ice-margin change (advance/recession) at the south-western sector of the Greenland Ice Sheet, comprising data from 3325 terrestrial, 439 lacustrine and 35 marine ice-margins respectively. The dataset also comprises measures of ice-marginal lake parameters including area and intersect (length of the lake - ice-margin interface). Measurements were made at approximately five year intervals (epochs) from 1987 to 2015. The ice sheet margin and adjacent ice-marginal lakes were delineated by applying the Normalised Difference Snow Index (NDSI) and the Normalised Difference Water Index (NDWI) respectively to Landsat TM, ETM+ and OLI scenes. Ice-margin changes were measured relative to a series of fixed reference points. The dataset was generated to facilitate comparison of changes at the disparate ice-marginal environments of the ice sheet and investigate temporal patterns of ice-margin recession. The dataset was created and processed by researchers in the School of Geography at the University of Leeds and the Institute of Integrative Biology at the University of Liverpool. No credit. completed Mallalieu, Joseph University of Leeds Researcher author Carrivick, Jonathan University of Leeds Researcher author Quincey, Duncan University of Leeds Researcher author Raby, Cassandra University of Liverpool 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 Mass Balance/Ice Sheet Mass Balance EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Motion/Ice Sheet Motion EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets > Glacier Mass Balance/Ice Sheet Mass Balance EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets > Glacier Motion/Ice Sheet Motion EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets EARTH SCIENCE > Hydrosphere > 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 Greenland Ice Sheet ice-marginal lake outlet glacier proglacial lake tidewater glacier theme South-western sector of the Greenland Ice Sheet Greenland 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 crossReference doi doi crossReference textTable eng utf8 geoscientificInformation inlandWaters -51.4682 -44.8168 60.9778 71.42444 1987-01-01 2015-12-31 0.0 1936.0 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 bytes 366285 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=ebfbbe88-902b-4c74-9b62-07101d89e509 WWW:LINK-1.0-http--link Get Data Download data download bytes 366285 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=ebfbbe88-902b-4c74-9b62-07101d89e509 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Measurements of ice-margin change were recorded by applying the Normalised Difference Snow Index (NDSI) to the Landsat TM, ETM+ and OLI archive to delineate the ice sheet margin and measure changes relative to a series of fixed reference points at approximately 5-year intervals (epochs) between 1987 and 2015. Rates of ice-margin advance or recession were calculated by differencing the mean distance values between the fixed reference points and the ice-margin in successive epochs, and subsequently dividing by the interval duration. Note that positive and negative values of mean ice-margin change and mean annual change represent ice-margin advance and recession respectively. Lake areas and intersects (length of the lake - ice-margin interface) were also derived at the same 5-year intervals by applying the Normalised Difference Water Index (NDWI) to the same Landsat scenes. The lake persistence parameter provides a quantitative measure of the presence of a lake in each of the respective epochs. The latitudes and altitudes of the fixed reference points were extracted from a 1985 DEM of the region. Full details of the satellite scenes used and the associated processing and data extraction in ENVI and ArcMap can be found in the publication listed below under References. Data collection: Scenes from the Landsat TM, ETM+ and OLI sensors were processed in ENVI v.5.2 and Esri ArcMap v.10.3.1. Data quality: The delineation of ice-margin and lake extent is assumed to be accurate to within ±1 pixel (30 m) of the true ice-margin/lake perimeter. Given the regional aggregation of measurements, it is assumed that any over-estimation of the ice-margin position is cancelled out by an equal and opposite under-estimation, and uncertainty in the ice-margin positions is therefore not specifically assessed for these bulk figures. In addition, the absolute error associated with each lake area measurement was dependent on lake size and planform, and thus resulted in a declining power law relationship whereby the greatest errors were associated with the smallest lakes. For example, lakes measuring 0.5 km2 had an area uncertainty of ~9 %, whilst lakes measuring > 5 km2 had an uncertainty of < 3 %. Rates of change at lacustrine margins were only generated when a lake was present in two or more successive epochs. Measurements of ice-margin change between 1987 and 1992 at the southernmost latitudes of the survey area are absent due to the unavailability of Landsat TM scenes for this region in the years 1985-1988. asNeeded completed