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dc.contributor.advisorBlankenship, Donald D.en
dc.creatorSchroeder, Dustin Matthewen
dc.date.accessioned2015-11-20T19:05:53Zen
dc.date.available2015-11-20T19:05:53Zen
dc.date.issued2014-05en
dc.date.submittedMay 2014en
dc.identifierdoi:10.15781/T2T63Qen
dc.identifier.urihttp://hdl.handle.net/2152/32606en
dc.descriptiontexten
dc.description.abstractHydrologic, lithologic, and geothermal basal boundary conditions can exert strong, even dominating, control on the evolution, stability, and sea level contribution of ice sheets and glaciers. However, the scales at which the physical processes and observable signatures of this control occur are typically smaller than the spatial resolutions currently achievable using ice penetrating radar. Further, the strength of radar bed echo returns is affected by the material and geometric properties of the bed as well as englacial attenuation from unknown ice temperature and chemistry, making assessment of basal conditions from echo strengths difficult. To address these challenges in interpreting basal properties at glaciologically relevant scales, a new algorithmic approach is applied to measuring the radar scattering function of the bed in terms of the relative contribution of angularly narrow specular energy and isotropically scattered diffuse energy. This relative specularity content is insensitive to englacial attenuation and can be used to constrain the geometry of the bed down to the centimeter scale. This approach is applied to an airborne radar sounding survey of Thwaites Glacier, West Antarctica using the information in the along-track scattering function to assess the extent and geometry of water across the catchment and detect the transition of that water from distributed canals to concentrated channels. This information is also used to constrain the morphology of subglacial bedforms and infer that the distribution of deformable sediments and exposed bedrock is similar to deglaciated paleo ice streams that experienced meltwater intensive retreats. Finally, models of radar echo strength and subglacial water routing are compared to estimate a catchment-wide distribution of geothermal flux consistent with rift-associated magma migration and volcanism. These observations of basal conditions provide new context for the past, current, and future evolution of Thwaites Glacier, the West Antarctic Ice Sheet, and their contribution to global sea level.en
dc.format.mimetypeapplication/pdfen
dc.language.isoenen
dc.subjectThwaites Glacieren
dc.subjectAntarcticaen
dc.subjectAirborne radar soundingen
dc.subjectWest Antarctic Ice Sheeten
dc.subjectSubglacialen
dc.subjectHydrologyen
dc.titleCharacterizing the subglacial hydrology of Thwaites Glacier, West Antarctica using airborne radar soundingen
dc.typeThesisen
dc.date.updated2015-11-20T19:05:53Zen
dc.contributor.committeeMemberRaney, R. Keithen
dc.contributor.committeeMemberAnderson, John Ben
dc.contributor.committeeMemberGhattas, Omaren
dc.contributor.committeeMemberHesse, Marc Aen
dc.contributor.committeeMemberMohrig, Daviden
dc.description.departmentGeological Sciencesen
thesis.degree.departmentGeological Sciencesen
thesis.degree.disciplineGeological Sciencesen
thesis.degree.grantorThe University of Texas at Austinen
thesis.degree.levelDoctoralen
thesis.degree.nameDoctor of Philosophyen


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