Paleo-Ice Stream Behavior: Retreat Scenarios and Changing Controls in the Ross Sea, Antarctica

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dc.contributor.advisorAnderson, John Ben_US
dc.creatorHalberstadt, Anna Ruth Westonen_US
dc.date.accessioned2017-08-02T18:35:29Zen_US
dc.date.available2017-08-02T18:35:29Zen_US
dc.date.created2016-05en_US
dc.date.issued2016-03-17en_US
dc.date.submittedMay 2016en_US
dc.date.updated2017-08-02T18:35:29Zen_US
dc.description.abstractStudying the history of ice-sheet behavior in Antarctica’s largest drainage basin, the Ross Sea, can improve understanding of patterns, timing, and controls on marine-based ice-sheet dynamics, and provide constraints on numerical ice-sheet models. Newly collected high-resolution multibeam swath bathymetry data, combined with two decades of legacy multibeam and seismic data, are used to map glacial landforms and reconstruct paleodrainage. Last Glacial Maximum grounded ice reached the continental shelf edge in the eastern but not western Ross Sea. Recessional geomorphic features in the western Ross Sea indicate virtually continuous retreat of the ice sheet in contact with the bed. In the eastern Ross Sea, well-preserved linear features and a lack of small-scale recessional landforms record rapid lift-off of grounded ice from the bed. Physiography exerted a first-order control on ice behavior, while seafloor geology played an important subsidiary role. This new analysis of retreat patterns suggests that: (1) a large embayment formed in the eastern Ross Sea; (2) retreat was complex and asynchronous between troughs; and (3) the eastern Ross Sea largely deglaciated prior to the western Ross Sea. Previously published grounding-line retreat scenarios are based on terrestrial observations; however, this work uses Ross Sea-wide geomorphology to constrain marine deglaciation.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationHalberstadt, Anna Ruth Weston. "Paleo-Ice Stream Behavior: Retreat Scenarios and Changing Controls in the Ross Sea, Antarctica." (2016) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/96244">https://hdl.handle.net/1911/96244</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/96244en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectGlacial geomorphologyen_US
dc.subjectAntarcticaen_US
dc.subjectLast Glacial Maximumen_US
dc.subjectice sheeten_US
dc.subjectice dynamicsen_US
dc.subjectgrounding line stabilityen_US
dc.subjectsedimentologyen_US
dc.subjectRoss Seaen_US
dc.subjectice sheet reconstructionen_US
dc.titlePaleo-Ice Stream Behavior: Retreat Scenarios and Changing Controls in the Ross Sea, Antarcticaen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentEarth Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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