Evidence for subglacial ponding across Taylor Glacier, Dry Valleys, Antarctica


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dc.contributor.author Hubbard, Alun L.
dc.contributor.author Lawson, Wendy
dc.contributor.author Anderson, B.
dc.contributor.author Hubbard, Bryn
dc.contributor.author Blatter, Heinz
dc.date.accessioned 2008-12-11T10:10:41Z
dc.date.available 2008-12-11T10:10:41Z
dc.date.issued 2004-06
dc.identifier.citation Hubbard , A L , Lawson , W , Anderson , B , Hubbard , B & Blatter , H 2004 , ' Evidence for subglacial ponding across Taylor Glacier, Dry Valleys, Antarctica ' Annals of Glaciology , vol 39 , no. 1 , pp. 79-84 . , 10.3189/172756404781813970 en
dc.identifier.issn 0260-3055
dc.identifier.other PURE: 94396
dc.identifier.other dspace: 2160/1514
dc.identifier.uri http://hdl.handle.net/2160/1514
dc.identifier.uri http://www.ingentaconnect.com/content/igsoc/agl/2004/00000039/00000001/art00014 en
dc.description Hubbard, Alun; Lawson, W.; Anderson, B.; Hubbard, B.P., (2004) Evidence for subglacial ponding across Taylor Glacier, Dry Valleys, Antarctica, Annals of Glaciology 39 (1), 79-84. RAE2008 en
dc.description.abstract Ice-penetrating radar and modelling data are presented suggesting the presence of a zone of temperate ice, water ponding or saturated sediment beneath the tongue of Taylor Glacier, Dry Valleys, Antarctica. The proposed subglacial zone lies 3-6 km up-glacier of the terminus and is 400-1000 m across. The zone coincides with an extensive topographic overdeepening to 80 m below sea level. High values of residual bed reflective power across this zone compared to other regions and the margins of the glacier require a high dielectric contrast between the ice and the bed and are strongly indicative of the presence of basal water or saturated sediment. Analysis of the hydraulic equipotential surface also indicates strong convergence into this zone of subglacial water flow paths. However, thermodynamic modelling reveals that basal temperatures in this region could not exceed -7 degrees C relative to the pressure-melting point. Such a result is at odds with the radar observations unless the subglacial water is a hypersaline brine. en
dc.format.extent 6 en
dc.language.iso eng
dc.relation.ispartof Annals of Glaciology en
dc.title Evidence for subglacial ponding across Taylor Glacier, Dry Valleys, Antarctica en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.3189/172756404781813970
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Centre for Glaciology en
dc.description.status Peer reviewed en

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