Ice Elevation Near the West Antarctic Ice Sheet Divide During the Last Glaciation

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Ice Elevation Near the West Antarctic Ice Sheet Divide During the Last Glaciation

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dc.contributor.author Borns, Harold W.
dc.contributor.author Parizek, Byron R.
dc.contributor.author Mukhopadhyay, Sujoy
dc.contributor.author Ackert, Robert P. Jr.
dc.date.accessioned 2009-08-25T20:15:16Z
dc.date.issued 2007
dc.identifier.citation Ackert, Robert P., Sujoy Mukhopadhyay, Byron R. Parizek, and Harold W. Borns. 2007. Ice elevation near the west Antarctic ice sheet divide during the last glaciation. Geophysical Research Letters 34(L21506): 1-6 en
dc.identifier.issn 0094-8276 en
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:3224728
dc.description.abstract Interior ice elevations of the West Antarctic Ice Sheet (WAIS) during the last glaciation, which can serve as benchmarks for ice-sheet models, are largely unconstrained. Here we report past ice elevation data from the Ohio Range, located near the WAIS divide and the onset region of the Mercer Ice Stream. Cosmogenic exposure ages of glacial erratics that record a WAIS highstand similar to 125 m above the present surface date to similar to 11.5 ka. The deglacial chronology prohibits an interior WAIS contribution to meltwater pulse 1A. Our observational data of ice elevation changes compare well with predictions of a thermomechanical ice-sheet model that incorporates very low basal shear stress downstream of the present day grounding line. We conclude that ice streams in the Ross Sea Embayment had thin, low-slope profiles during the last glaciation and interior WAIS ice elevations during this period were several hundred meters lower than previous reconstructions. en
dc.description.sponsorship Earth and Planetary Sciences en
dc.language.iso en_US en
dc.publisher American Geophysical Union en
dc.relation.isversionof http://dx.doi.org/10.1029/2007GL031412 en
dc.relation.hasversion http://www.people.fas.harvard.edu/%7emukhop/WAIS.pdf en
dash.license META_ONLY
dc.title Ice Elevation Near the West Antarctic Ice Sheet Divide During the Last Glaciation en
dc.type Journal Article
dc.description.version Version of Record
dc.relation.journal Geophysical Research Letters en
dash.depositing.author Mukhopadhyay, Sujoy
dash.embargo.until 10000-01-01

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  • FAS Scholarly Articles [5128]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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