Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7248
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dc.contributor.authorallBindschadler, R.; Code 614.0, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAen
dc.contributor.authorallChoi, H.; SAIC, NASA Goddard Space Flight Center, Greenbelt MD 20771, USAen
dc.contributor.authorallWichlacz, A.; SAIC, NASA Goddard Space Flight Center, Greenbelt MD 20771, USAen
dc.contributor.authorallBingham, R.; School of Geosciences, University of Aberdeen, Aberdeen, AB24 3FX, UKen
dc.contributor.authorallBohlander, J.; National Snow and Ice Data Center, University of Colorado, Boulder CO 80309-0449, USAen
dc.contributor.authorallBrunt, K.; Code 614.1, NASA Goddard Space Flight Center, Greenbelt MD 20771, USAen
dc.contributor.authorallCorr, H.; British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UKen
dc.contributor.authorallDrews, R.; Alfred Wegener Institut for Polar and Marine Research, Postfach 12 01 61, 27515 Bremerhaven, Germanyen
dc.contributor.authorallFricker, H.; Scripps Institute of Oceanography, University of California at San Diego, 9500 Giman Drive, La Jolla CA 92093, USAen
dc.contributor.authorallHall, M.; Climate Change Institute, University of Maine, Orono ME 04469, USAen
dc.contributor.authorallHindmarsh, R.; British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UKen
dc.contributor.authorallKohler, J.; Norwegian Polar Institute, Polar Environmental Centre, 9296 Tromso, Norwayen
dc.contributor.authorallPadman, L.; Earth and Space Research (ESR), 3350 SW Cascade Ave., Corvallis, OR 97333-1536, USAen
dc.contributor.authorallRack, W.; Gateway Antarctica, University of Canterbury, Private Bag, Christchurch 8140, New Zealanden
dc.contributor.authorallRotschky, G.; Norwegian Polar Institute, Polar Environmental Centre, 9296 Tromso, Norwayen
dc.contributor.authorallUrbini, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallVornberger, P.; SAIC, NASA Goddard Space Flight Center, Greenbelt MD 20771, USAen
dc.contributor.authorallYoung, N.; Australian Antarctic Division, University of Tasmania, Kingston, Tasmania 7050, Australiaen
dc.date.accessioned2011-12-20T14:12:55Zen
dc.date.available2011-12-20T14:12:55Zen
dc.date.issued2011-07en
dc.identifier.urihttp://hdl.handle.net/2122/7248en
dc.description.abstractTwo ice-dynamic transitions of the Antarctic ice sheet – the boundary of grounded ice features and the freelyfloating boundary – are mapped at 15-m resolution by participants of the International Polar Year project ASAID using customized software combining Landsat-7 imagery and ICESat/GLAS laser altimetry. The grounded ice boundary is 53 610 km long; 74% abuts to floating ice shelves or outlet glaciers, 19% is adjacent to open or sea-ice covered ocean, and 7% of the boundary ice terminates on land. The freelyfloating boundary, called here the hydrostatic line, is the most landward position on ice shelves that expresses the full amplitude of oscillating ocean tides. It extends 27 521 km and is discontinuous. Positional (one-sigma) accuracies of the grounded ice boundary vary an order of magnitude ranging from ±52m for the land and open-ocean terminating segments to ±502m for the outlet glaciers. The hydrostatic line is less well positioned with errors over 2 km. Elevations along each line are selected from 6 candidate digital elevation models based on their agreement with ICESat elevation values and surface shape inferred from the Landsat imagery. Elevations along the hydrostatic line are converted to ice thicknesses by applying a firn-correction factor and a flotation criterion. BEDMAP-compiled data and other airborne data are compared to the ASAID elevations and ice thicknesses to arrive at quantitative (one-sigma) uncertainties of surface elevations of ±3.6, ±9.6, ±11.4, ±30 and ±100m for five ASAID-assigned confidence levels. Over one-half of the surface elevations along the grounded ice boundary and over one-third of the hydrostatic line elevations are ranked in the highest two confidence categories. A comparison between ASAID-calculated ice shelf thicknesses and BEDMAP-compiled data indicate a thin-ice bias of 41.2±71.3m for the ASAID ice thicknesses. The relationship between the seaward offset of the hydrostatic line from the grounded ice boundary only weakly matches a prediction based on beam theory. The mapped products along with the customized software to generate them and a variety of intermediate products are available from the National Snow and Ice Data Center.en
dc.language.isoEnglishen
dc.publisher.nameCopernicus Pubblicationsen
dc.relation.ispartofThe Cryosphereen
dc.relation.ispartofseries3/5 (2011)en
dc.subjectAntarcticaen
dc.subjectice sheeten
dc.subjectphotoclinometryen
dc.subjectfreely-floating boundariesen
dc.titleGetting around Antarctica: new high-resolution mappings of the grounded and freely-floating boundaries of the Antarctic ice sheet created for the International Polar Yearen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber569-588en
dc.identifier.URLwww.the-cryosphere.net/5/569/2011/en
dc.subject.INGV02. Cryosphere::02.02. Glaciers::02.02.05. Ice dynamicsen
dc.subject.INGV02. Cryosphere::02.02. Glaciers::02.02.06. Mass balanceen
dc.subject.INGV02. Cryosphere::02.02. Glaciers::02.02.07. Ocean/ice interactionen
dc.identifier.doi10.5194/tc-5-569-2011en
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dc.description.obiettivoSpecifico3.8. Geofisica per l'ambienteen
dc.description.journalTypeJCR Journalen
dc.description.fulltextopenen
dc.contributor.authorBindschadler, R.en
dc.contributor.authorChoi, H.en
dc.contributor.authorWichlacz, A.en
dc.contributor.authorBingham, R.en
dc.contributor.authorBohlander, J.en
dc.contributor.authorBrunt, K.en
dc.contributor.authorCorr, H.en
dc.contributor.authorDrews, R.en
dc.contributor.authorFricker, H.en
dc.contributor.authorHall, M.en
dc.contributor.authorHindmarsh, R.en
dc.contributor.authorKohler, J.en
dc.contributor.authorPadman, L.en
dc.contributor.authorRack, W.en
dc.contributor.authorRotschky, G.en
dc.contributor.authorUrbini, S.en
dc.contributor.authorVornberger, P.en
dc.contributor.authorYoung, N.en
dc.contributor.departmentCode 614.0, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAen
dc.contributor.departmentSAIC, NASA Goddard Space Flight Center, Greenbelt MD 20771, USAen
dc.contributor.departmentSAIC, NASA Goddard Space Flight Center, Greenbelt MD 20771, USAen
dc.contributor.departmentSchool of Geosciences, University of Aberdeen, Aberdeen, AB24 3FX, UKen
dc.contributor.departmentNational Snow and Ice Data Center, University of Colorado, Boulder CO 80309-0449, USAen
dc.contributor.departmentCode 614.1, NASA Goddard Space Flight Center, Greenbelt MD 20771, USAen
dc.contributor.departmentBritish Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UKen
dc.contributor.departmentAlfred Wegener Institut for Polar and Marine Research, Postfach 12 01 61, 27515 Bremerhaven, Germanyen
dc.contributor.departmentScripps Institute of Oceanography, University of California at San Diego, 9500 Giman Drive, La Jolla CA 92093, USAen
dc.contributor.departmentClimate Change Institute, University of Maine, Orono ME 04469, USAen
dc.contributor.departmentBritish Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UKen
dc.contributor.departmentNorwegian Polar Institute, Polar Environmental Centre, 9296 Tromso, Norwayen
dc.contributor.departmentEarth and Space Research (ESR), 3350 SW Cascade Ave., Corvallis, OR 97333-1536, USAen
dc.contributor.departmentGateway Antarctica, University of Canterbury, Private Bag, Christchurch 8140, New Zealanden
dc.contributor.departmentNorwegian Polar Institute, Polar Environmental Centre, 9296 Tromso, Norwayen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentSAIC, NASA Goddard Space Flight Center, Greenbelt MD 20771, USAen
dc.contributor.departmentAustralian Antarctic Division, University of Tasmania, Kingston, Tasmania 7050, Australiaen
item.cerifentitytypePublications-
item.languageiso639-1en-
item.fulltextWith Fulltext-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.grantfulltextopen-
item.openairetypearticle-
crisitem.classification.parent02. Cryosphere-
crisitem.classification.parent02. Cryosphere-
crisitem.classification.parent02. Cryosphere-
crisitem.author.deptCode 614.0, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA-
crisitem.author.deptSAIC, NASA Goddard Space Flight Center, Greenbelt MD 20771, USA-
crisitem.author.deptSAIC, NASA Goddard Space Flight Center, Greenbelt MD 20771, USA-
crisitem.author.deptSchool of Geosciences, University of Aberdeen, UK-
crisitem.author.deptNational Snow and Ice Data Center, University of Colorado, Boulder CO 80309-0449, USA-
crisitem.author.deptCode 614.1, NASA Goddard Space Flight Center, Greenbelt MD 20771, USA-
crisitem.author.deptAlfred Wegener Institut for Polar and Marine Research, Postfach 12 01 61, 27515 Bremerhaven, Germany-
crisitem.author.deptScripps Institute of Oceanography, University of California at San Diego, 9500 Giman Drive, La Jolla CA 92093, USA-
crisitem.author.deptBritish Antarctic Survey, Cambridge, UK-
crisitem.author.deptNorwegian Polar Institute, Fram Centre, Tromsø, Norway-
crisitem.author.deptEarth and Space Research (ESR), 3350 SW Cascade Ave., Corvallis, OR 97333-1536, USA-
crisitem.author.deptGateway Antarctica, University of Canterbury, Private Bag, Christchurch 8140, New Zealand-
crisitem.author.deptNorwegian Polar Institute, Polar Environmental Centre, 9296 Tromso, Norway-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptSAIC, NASA Goddard Space Flight Center, Greenbelt MD 20771, USA-
crisitem.author.deptDepartment of Sustainability, Environment, Water, Population and Communities, Australian Antarctic Division, Hobart, Tasmania, Australia and Antarctic Climate and Ecosystems Cooperative Research Centre, Private Bag 80, Hobart, Tasmania 7001, Australia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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