abbe3bbb-fb2b-416b-9ba2-12a0f914bac8 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 2017-11-13 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 Transient marine ice sheet response to temporally varying forcing 2017-11-13 creation 2017-11-13 revision 2017-11-13 publication 2017-11-13 released None https://doi.org/10.5285/abbe3bbb-fb2b-416b-9ba2-12a0f914bac8 doi GB/NERC/BAS/PDC/01041 https://data.bas.ac.uk/ Please cite this item as: Goldberg, D., & Snow, K. (2017). Transient marine ice sheet response to temporally varying forcing (Version None) [Data set]. Polar Data Centre; British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK.. https://doi.org/10.5285/abbe3bbb-fb2b-416b-9ba2-12a0f914bac8 The data set was produced for the work detailed in 'The response of ice sheets to climate variability' by K Snow et al (2017, Geophys Research Letters). A coupled ice sheet-ocean model is configured in an idealised setting with an inland-deepening bedrock, forced by far-field hydrographic profiles representative of the Amundsen Sea continental shelf. Similar to observed variability, the thermocline depth in the far-field is moved up and down on various times scales as detailed in the publication, with periods ranging from 2 to ~50 years. Bedrock elevation is provided, and annual melt rate and ice thickness (or sub-annual for short time scales) is provided as well for each forcing period. In addition, similar experiments were carried out with an ice-only model with parameterised forcing. These outputs are provided too. No credit. completed Snow, Kate The Australian National University Researcher author Goldberg, Daniel University of Edinburgh 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 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 coupled modelling cryosphere grounding line ice sheet variability ice shelves theme 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 Data released under Open Government Licence V3.0: url url crossReference url url crossReference textTable eng utf8 environment oceans -180.0 180.0 -90.0 90.0 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 bytes 1 https://ramadda.data.bas.ac.uk/repository/entry/show/?entryid=abbe3bbb-fb2b-416b-9ba2-12a0f914bac8 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The data is 'raw' output of the Massachusetts Institute of Technology general circulation model (MITgcm; mitgcm.org). In each model run the diagnostics tool output yearly the temporal average of various diagnostics, including those provided, over the preceding year. The runs were done using version c66j, with the addition of the changes described in Snow K et al (2017, Geophys Research Letters) as well as Jordan J et al (2017, JGR-Oceans, doi:10.1002/2017JC013251). All relevant parameters given in the supplement of Snow K et al (2017, Geophys Research Letters). The files are in Network Common Dataform (netcdf) format. A model output is provided for each experiment. There are 4 different types of experiment: COUPLED: output from synchronously coupled runs UNCOUPLED_SYM: ice model-only with a transversely symmetric depth-dependent parameterised melt as detailed in Snow K et al (2017, Geophys Research Letters) UNCOUPLED_ASYM: ice model-only with a transversely asymmetric depth-dependent parameterised melt as detailed in Snow K et al (2017, Geophys Research Letters) SLOW: ice model-only with a transversely symmetric depth-dependent parameterised melt as detailed in Snow K et al (2017, Geophys Research Letters), and elevated basal drag and in order to yield a slower-flowing ice sheet and shelf A different file exists for each experiment with naming convention [EXPT TYPE]_[PERIOD_IN_YEARS]_YEAR.nc, with the addition of a single file for each expt type: [EXPT_TYPE]_CONST_FORCING.nc in which all external forcing is time-independent. Dimensions of these files are: X (orthogonal horizontal coordinate in meters) Y (orthogonal horizontal coordinate in meters) time (years) NB: as detailed in Snow K et al (2017, Geophys Research Letters), the domain is idealised and an f-plane is used for Coriolis force, so the domain can be rotated without loss of generality. Fields are: double THICKNESS(time, Y, X) - the ice thickness (floating and grounded) in meters double MELTRATE(time, Y, X) - the melt/freeze rate in meters ice per year (positive where melting) double HEIGHT_ABOVE_FLOAT(time, Y, X) - the portion of the ice column greater than the maximum floating thickness (calculated as double MASK(time, Y, X)) - a file indicating the parts of the domain that actually represent the computational domain (ignores walls, etc). Equal to 1 where there is ice sheet or shelf, 0 where there is open ocean, and -1 outside of the physical domain. One additional file is provided with dimensions X,Y only, detailing the bedrock elevation: BED.nc. Data quality: No "cleaning" was involved. The accuracy is subject to the ability of the model to approximate the differential equations solved, and the ability of the differential equations solved to represent reality, both of which issues have been discussed extensively in the literature (e.g. Durran et al (1999), Numerical Methods for Fluid Dynamics:with Applications in Geophysics, Springer). asNeeded completed