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dc.contributor.authorRaymond, C. F.
dc.contributor.authorCatania, Ginny A.
dc.contributor.authorNereson, Nadine
dc.contributor.authorvan der Veen, Cornelis J.
dc.date.accessioned2015-04-06T20:07:08Z
dc.date.available2015-04-06T20:07:08Z
dc.date.issued2006-01-01
dc.identifier.citationRaymond, C.F.; Catania, Ginny A.; Nereson, Nadine; van der Veen, C.J. "Bed radar reflectivity across the north margin of Whillans Ice Stream, West Antarctica, and implications for margin processes." Journal of Glaciology, Volume 52, Number 176, January 2006, pp. 3-10(8). http://dx.doi.org/10.3189/172756506781828890.en_US
dc.identifier.urihttp://hdl.handle.net/1808/17323
dc.descriptionThis is the published version, also available here: http://dx.doi.org/10.3189/172756506781828890.en_US
dc.description.abstractSurface-based ice-penetrating radar profiles were made across the active north margin (the Snake) of the upper part of Whillans Ice Stream (formerly Ice Stream B, branch B2), West Antarctica, at three locations. Low frequency (about 2 MHz) and the ground deployment of the radar allowed penetration through the near-surface zone of fracturing to detect internal layering and bed reflection characteristics on continuous profiles spanning from the slow-moving ice of Engelhardt Ridge well into the chaotic zone of the shear margin. Internal layers were tracked beneath the chaotic zone, where they are warped but remain continuous. The energy returned from internal layers showed no systematic changes associated with the transition from the undisturbed surface of the slow-moving ice into the fractured surface of the shear margin, thus indicating little effect from the surface crevasses on the penetration of the radar signal. Based on this calibration of the near-surface effects and corrections for path length, spreading and attenuation, we examine the spatial variation of bed reflectivity. Low bed reflectivity found under Engelhardt Ridge extends under the chaotic zone of the margin into fast-moving ice. We argue that the fast motion in a band along the margin is mediated by processes other than deformation of thick dilated till that is the source of lubrication allowing fast motion in the interior of the ice stream.en_US
dc.publisherInternational Glaciological Societyen_US
dc.titleBed radar reflectivity across the north margin of Whillans Ice Stream, West Antarctica, and implications for margin processesen_US
dc.typeArticle
kusw.kuauthorvan der Veen, Cornelis J.
kusw.kudepartmentGeographyen_US
dc.identifier.doi10.3189/172756506781828890
kusw.oaversionScholarly/refereed, publisher version
kusw.oapolicyThis item does not meet KU Open Access policy criteria.
dc.rights.accessrightsopenAccess


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