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dc.contributor.advisorChairperson, Graduate Committee: John C. Priscu and John Dore (co-chair)en
dc.contributor.authorRoush, Kimberly Anneen
dc.contributor.otherJohn Priscu, Mark Skidmore, Alex Michaud and the WISSARD Science Team were co-authors of the article, 'Signatures of subglacial water in shallow sediments of the Whillans grounding zone and overlying water column' which is contained within this thesis.en
dc.contributor.otherJohn Priscu, John Dore, Wei Li, Tristy Vick-Majors and the WISSARD Science Team were co-authors of the article, 'Sediment porewater organic matter content' which is contained within this thesis.en
dc.coverage.spatialRoss Ice Shelf (Antarctica)en
dc.date.accessioned2021-06-09T18:47:40Z
dc.date.available2021-06-09T18:47:40Z
dc.date.issued2019en
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/16200en
dc.description.abstractThe research presented in this thesis focused on subglacial flow beneath the West Antarctic Ice Sheet (WAIS) and its potential influence near the grounding zone. Antarctic grounding zones are of specific scientific interest because they can impact the stability of the continental ice sheet and its breakup, potentially resulting in significant sea level rise. My major objective was to determine whether there was influence of subglacial water at the Whillans Grounding Zone (WGZ) on the Siple Coast of the WAIS. A gravity corer was used to collect a 70 cm sediment core through 780 m of ice borehole drilled using a hot water clean access drilling system. The core was collected in a marine embayment adjacent to the WGZ beneath a 10 m water column. I used a combination of geochemical, isotopic and organic matter analyses to characterize the benthic sediments, porewater and water column. The geochemical and isotopic data showed the influence of subglacial freshwater on sediment porewater at specific depths in the 70 cm core. Vertical gradients of chloride and sulfate between surficial sediment and the overlying water column indicated ion diffusion from porewater to the column water. Dissolved organic matter concentration of sediment porewater and the overlying water column also indicated upward diffusion occurs from porewater to the overlying seawater. Sediment particulate carbon and nitrogen data showed that benthic sediments were more depleted in nitrogen than the overlying seawater. Sediment particulate carbon and nitrogen data showed that benthic sediments were more depleted in nitrogen than the overlying seawater. Geochemical, isotopic and organic matter data supports the influence of subglacial freshwater at the WGZ.en
dc.language.isoenen
dc.publisherMontana State University - Bozeman, College of Agricultureen
dc.subject.lcshGlaciersen
dc.subject.lcshFresh wateren
dc.subject.lcshSediments (Geology)en
dc.subject.lcshGeochemistryen
dc.titleGeochemical characterization of shallow sediments from the grounding zone of the Whillans Ice Streamen
dc.typeThesisen
dc.rights.holderCopyright 2019 by Kimberly Anne Roushen
thesis.degree.committeemembersMembers, Graduate Committee: Mark L. Skidmoreen
thesis.degree.departmentLand Resources & Environmental Sciences.en
thesis.degree.genreThesisen
thesis.degree.nameMSen
thesis.format.extentfirstpage1en
thesis.format.extentlastpage150en
mus.data.thumbpage17en


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