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dc.contributor.authorYoung, TJ
dc.contributor.authorSchroeder, DM
dc.contributor.authorJordan, TM
dc.contributor.authorChristoffersen, P
dc.contributor.authorTulaczyk, SM
dc.contributor.authorCulberg, R
dc.contributor.authorBienert, NL
dc.date.accessioned2021-04-29T23:30:36Z
dc.date.available2021-04-29T23:30:36Z
dc.date.issued2021
dc.identifier.issn2169-9003
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/321755
dc.description.abstractIn airborne radargrams, undulating periodic patterns in amplitude that overprint traditional radiostratigraphic layering are occasionally observed, however they have yet to be analyzed from a geophysical or glaciological perspective. We present evidence supported by theory that these depth-periodic patterns are consistent with a modulation of the received radar power due to the birefringence of polar ice, and therefore indicate the presence of bulk fabric anisotropy. Here, we investigate the periodic component of birefringence-induced radar power recorded in airborne radar data at the eastern shear margin of Thwaites Glacier and quantify the lateral variation in azimuthal fabric strength across this margin. We find the depth variability of birefringence periodicity crossing the shear margin to be a visual expression of its shear state and its development, which appears consistent with present-day ice deformation. The morphology of the birefringent patterns is centered at the location of maximum shear and observed in all cross-margin profiles, consistent with predictions of ice fabric when subjected to simple shear. The englacial fabric appears stronger inside the ice stream than outward of the shear margin. The detection of birefringent periodicity from non-polarimetric radargrams presents a novel use of subsurface radar to constrain lateral variations in fabric strength, locate present and past shear margins, and characterize the deformation history of polar ice sheets.
dc.description.sponsorshipNational Science Foundation
dc.publisherAmerican Geophysical Union (AGU)
dc.rightsAll rights reserved
dc.titleInferring Ice Fabric From Birefringence Loss in Airborne Radargrams: Application to the Eastern Shear Margin of Thwaites Glacier, West Antarctica
dc.typeArticle
prism.issueIdentifier5
prism.publicationDate2021
prism.publicationNameJournal of Geophysical Research: Earth Surface
prism.volume126
dc.identifier.doi10.17863/CAM.68878
dcterms.dateAccepted2021-04-23
rioxxterms.versionofrecord10.1029/2020JF006023
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2021-05-01
dc.contributor.orcidYoung, TJ [0000-0001-5865-3459]
dc.contributor.orcidSchroeder, DM [0000-0003-1916-3929]
dc.contributor.orcidJordan, TM [0000-0002-2096-8858]
dc.contributor.orcidChristoffersen, P [0000-0003-2643-8724]
dc.contributor.orcidTulaczyk, SM [0000-0002-9711-4332]
dc.contributor.orcidCulberg, R [0000-0002-4460-2359]
dc.contributor.orcidBienert, NL [0000-0002-9428-327X]
dc.identifier.eissn2169-9011
rioxxterms.typeJournal Article/Review
pubs.funder-project-idNatural Environment Research Council (NE/S006788/1)
cam.issuedOnline2021-05-27
cam.orpheus.successMon May 03 07:30:31 BST 2021 - Embargo updated
rioxxterms.freetoread.startdate2021-11-11


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