{"NOAAStudyId":"13440","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2012-10-24","dataPublisher":"NOAA","dataType":"PALEOCLIMATIC MODELING","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/paleoclimatology-modeling","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-model-13440.xml","doi":null,"earliestYearBP":200000,"earliestYearCE":-198050,"entryId":"noaa-model-13440","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"0902870"}],"investigators":"Pollard, D.; DeConto, R.M.","mostRecentYearBP":0,"mostRecentYearCE":1950,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/13440","originalSource":null,"publication":[{"abstract":"The formulation of a 3-D ice sheet-shelf model is described. The model is designed for long-term continental-scale applications, and has been used mostly in paleoclimatic studies. It uses a hybrid combination of the scaled shallow ice and shallow shelf approximations for ice flow. Floating ice shelves and grounding-line migration are included, with parameterized ice fluxes at grounding lines that allows relatively coarse resolutions to be used. All significant components and parameterizations of the model are described in some detail. Basic results for modern Antarctica are compared with observations, and simulations over the last 5 million years are compared with previously published results. The sensitivity of ice volumes during the last deglaciation to basal sliding coefficients is discussed. \r\n","author":null,"citation":"Pollard, D. and R.M. DeConto. 2012. \r\nDescription of a hybrid ice sheet-shelf model, and application to Antarctica. \r\nGeoscientific Model Development, 5, 1273-1295. DOI: 10.5194/gmd-5-1273-2012\r\n","edition":null,"identifier":{"id":"10.5194/gmd-5-1273-2012","type":"doi","url":"http://dx.doi.org/10.5194/gmd-5-1273-2012"},"issue":null,"journal":"Geoscientific Model Development","pages":null,"pubRank":"1","pubYear":2012,"reportNumber":null,"title":"Description of a hybrid ice sheet-shelf model, and application to Antarctica","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"22723","geo":{"geoType":"Feature","geometry":{"coordinates":["-90","90","-180","180"],"type":"POLYGON"},"properties":{"easternmostLongitude":"180","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"90","southernmostLatitude":"-90","westernmostLongitude":"-180"}},"locationName":"Geographic Region>Global","mappable":"N","paleoData":[{"NOAADataTableId":"23142","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>model>other 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MODELING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>ice temperature"},{"cvAdditionalInfo":"basal homologous temperature","cvDataType":"PALEOCLIMATIC MODELING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>ice temperature"},{"cvAdditionalInfo":"surface ice","cvDataType":"PALEOCLIMATIC MODELING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"meter per year","cvWhat":"earth system variable>circulation variable>ice sheet velocity>upward ice sheet velocity"},{"cvAdditionalInfo":"basal ice","cvDataType":"PALEOCLIMATIC MODELING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"meter per year","cvWhat":"earth system variable>circulation variable>ice sheet velocity>upward ice sheet velocity"},{"cvAdditionalInfo":"surface ice","cvDataType":"PALEOCLIMATIC MODELING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"meter per year","cvWhat":"earth system variable>circulation variable>ice sheet velocity>ice sheet x velocity"},{"cvAdditionalInfo":"basal ice","cvDataType":"PALEOCLIMATIC MODELING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"meter per year","cvWhat":"earth system variable>circulation variable>ice sheet velocity>ice sheet x velocity"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCLIMATIC MODELING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"meter per year","cvWhat":"earth system variable>circulation variable>ice sheet velocity>ice sheet x velocity"},{"cvAdditionalInfo":"surface ice","cvDataType":"PALEOCLIMATIC MODELING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"meter per year","cvWhat":"earth system variable>circulation variable>ice sheet velocity>ice sheet y velocity"},{"cvAdditionalInfo":"basal ice","cvDataType":"PALEOCLIMATIC MODELING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"meter per year","cvWhat":"earth system variable>circulation variable>ice sheet velocity>ice sheet y velocity"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCLIMATIC MODELING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"meter per year","cvWhat":"earth system variable>circulation variable>ice sheet velocity>ice sheet y velocity"},{"cvAdditionalInfo":"OH basin sector number","cvDataType":"PALEOCLIMATIC MODELING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"dimensionless","cvWhat":"sampling metadata>notes"}]}],"dataTableName":"Pollard2012","dataTableNotes":null,"earliestYear":200000,"earliestYearBP":200000,"earliestYearCE":-198050,"mostRecentYear":0,"mostRecentYearBP":0,"mostRecentYearCE":1950,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Global"}],"studyCode":null,"studyName":"Model Simulations of Orbital Sensitivity of North American Ice Sheets","studyNotes":"Snapshots of a 3-D ice sheet model (Pollard and DeConto, 2012) applied over \n North America and Greenland, driven either by simply parameterized climate\n (similarly to Pollard and DeConto, 2009), or by a look-up table of previous \n Global Climate Model (GCM) solutions (similarly to DeConto and Pollard, 2003),\n with idealized 40,000-yr sinusoidal climate variations. \n \n  Main model variables of interest are:\n     h  = ice sheet thickness (m)\n     hs = surface elevation (m)\n    hb = bedrock elevation (m)\n    maskwater = 0 for land or grounded ice, 1 for ocean or floating ice.\n \n   Latitudes of grid points:\n   Every 0.5 degrees, from 20.5 N to 84.5 N (130 points).  \n \n   Longitudes of grid points:\n   Every 1.0 degrees, from 179.5 W to -10.5 W (170 points).\n \n   Time period:\n   Model integrations of up to 200,000 years, representing idealized \n   orbital forcing with 40,000 year periodicity. Variables are saved\n   every 2000 years, from 0 up to 200000 yr (up to 101 saves).    \n \n   Each NetCDF file contains results for one model experiment, named as follows: \n   fort.92_cyca to fort.92_cych.nc: \n     Using parameterized climate forcing, each with slightly different climate\n     parameters.\n \n   fort.92_gcmcyc1.nc to fort.92_gcmcyc5.nc:\n     Using GCM lookup-table forcing, each with slightly different look-up\n     parameters, mainly albedo feedback strength.\n \n  ADDITIONAL REFERENCE: \n    DeConto, R.M. and D. Pollard. 2003. Rapid Cenozoic glaciation of Antarctica induced by declining atmospheric CO2. Nature, 421, 245-249.\n \n  ADDITIONAL REFERENCE: \n    Pollard, D. and R.M. DeConto. 2009. Modelling West Antarctic ice sheet growth and collapse through the past five million years. Nature, 458, 329-332\n ","version":"1.0","xmlId":"11480"}