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dc.contributor.authorVeitch, Stephen A.
dc.contributor.authorKarplus, Marianne
dc.contributor.authorKaip, Galen
dc.contributor.authorGonzalez, Lucia F.
dc.contributor.authorAmundson, Jason M.
dc.contributor.authorBartholomaus, Timothy C.
dc.date.accessioned2022-03-29T18:55:26Z
dc.date.available2022-03-29T18:55:26Z
dc.date.issued2021-03-26
dc.identifier.citationVeitch SA, Karplus M, Kaip G, Gonzalez LF, Amundson JM, Bartholomaus TC (2021). Ice thickness estimates of Lemon Creek Glacier, Alaska, from active-source seismic imaging. Journal of Glaciology 67(265), 824–832. https://doi.org/10.1017/jog.2021.32en_US
dc.identifier.urihttp://hdl.handle.net/11122/12850
dc.description.abstractLemon Creek Glacier, a temperate valley glacier in the Juneau Icefield of Southeast Alaska, is the site of long running (>60 years) glaciological studies. However, the most recent published estimates of its thickness and subglacial topography come from two ∼50 years old sources that are not in agreement and do not account for the effects of years of negative mass balance. We collected a 1-km long active-source seismic line on the upper section of the glacier parallel and near to the centerline of the glacier, roughly straddling the equilibrium-line altitude. We used these data to perform joint reflection-refraction velocity modeling and reflection imaging of the glacier bed. We find that this upper section of Lemon Creek Glacier is as much as 150 m (∼65%) thicker than previously suggested with a large overdeepening in an area previously believed to have a uniform thickness. Our results lead us to reinterpret the impact of basal motion on ice flow and have a significant impact on expectations of subglacial hydrology. We suggest that further efforts to develop a whole-glacier model of subglacial topography are necessary to support studies that require accurate models of ice thickness and subglacial topography.en_US
dc.description.sponsorshipWe thank the Juneau Icefield Research Program (JIRP) for their support with facilities at Camp 17 and logistical planning for the field work. We thank Emily Graves, Joachim Schalk and Celeste Labedz for their participation in the field work. We thank the Incorporated Research Institutions for Seismology Seismic Source Facility at the University of Texas at El Paso for their assistance with the seismic sources. We thank two reviewers for their helpful commentary, and the Journal’s editorial volunteers and staff for their invaluable role in supporting this publication. This work was partially funded by Marianne Karplus’s startup funds at the University of Texas at El Paso.en_US
dc.language.isoen_USen_US
dc.publisherCambridge University Pressen_US
dc.subjectGlacier geophysicsen_US
dc.subjectglaciological instruments and methodsen_US
dc.subjectice thickness measurementsen_US
dc.subjectmountain glaciersen_US
dc.subjectseismologyen_US
dc.subjectLemon Creek Glacieren_US
dc.subjecttemperate valley glacieren_US
dc.titleIce thickness estimates of Lemon Creek Glacier, Alaska, from active-source seismic imagingen_US
dc.typeArticleen_US
dc.description.peerreviewYesen_US
refterms.dateFOA2022-03-29T18:55:26Z
dc.identifier.journalJournal of Glaciologyen_US


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