Show simple item record

dc.contributor.authorDelf, Richard
dc.contributor.authorBingham, Robert G.
dc.contributor.authorCurtis, Andrew
dc.contributor.authorSingh, Satyan
dc.contributor.authorGiannopoulos, Antonios
dc.contributor.authorSchwarz, Benjamin
dc.contributor.authorBorstad, Chris P.
dc.identifier.citationDelf, R., Bingham, R. G., Curtis, A., Singh, S., Giannopoulos, A., Schwarz, B., & Borstad, C. P. (2022). Reanalysis of polythermal glacier thermal structure using radar diffraction focusing. Journal of Geophysical Research: Earth Surface, 127, e2021JF006382en_US
dc.descriptionRichard Delf et al, 2022, Reanalysis of polythermal glacier thermal structure using radar diffraction focussing, Journal of Geophysical Research: Earth Surface, , Citation number, 10.1029/2021JF006382. To view the published open abstract, go to
dc.description.abstractGround-penetrating radar (GPR) is widely used on polythermal glaciers to image bed topography and detect internal scatter due to water inclusions in temperate ice. The glaciological importance of this is twofold: bed topography is a primary component for modeling the long-term evolution of glaciers and ice sheets, and the presence of temperate ice and associated englacial water significantly reduces overall ice viscosity. Englacial water has a direct influence on radar velocity, which can result in incorrect observations of bed topography due to errors in depth conversion. Assessment of radar velocities often requires multi-offset surveys, yet these are logistically challenging and time consuming to acquire, hence techniques to extract velocity from common-offset data are required. We calculate englacial radar velocity from common offset GPR data collected on Von Postbreen, a polythermal glacier in Svalbard. We first separate and enhance the diffracted wavefield by systematically assessing data coherence. We then use the focusing metric of negative entropy to deduce a migration velocity field and produce a velocity model which varies spatially across the glacier. We show that this velocity field successfully differentiates between areas of cold and temperate ice and can detect lateral variations in radar velocity close to the glacier bed. This velocity field results in consistently lower ice depths relative to those derived from a commonly assumed constant velocity, with an average difference of 4.9 ± 2.5% of local ice depth. This indicates that diffraction focusing and velocity estimation are crucial in retrieving correct bed topography in the presence of temperate ice.en_US
dc.publisherAmerican Geophysical Unionen_US
dc.subjectglacier thermal structureen_US
dc.titleReanalysis of Polythermal Glacier Thermal Structure Using Radar Diffraction Focusingen_US
mus.citation.journaltitleJournal of Geophysical Research: Earth Surfaceen_US
mus.relation.collegeCollege of Engineeringen_US
mus.relation.departmentCivil Engineering.en_US
mus.relation.universityMontana State University - Bozemanen_US

Files in this item


This item appears in the following Collection(s)

Show simple item record

Except where otherwise noted, this item's license is described as cc-by

MSU uses DSpace software, copyright © 2002-2017  Duraspace. For library collections that are not accessible, we are committed to providing reasonable accommodations and timely access to users with disabilities. For assistance, please submit an accessibility request for library material.