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dc.contributor.authorSchroeder, Dustin Men
dc.contributor.authorDowdeswell, Julianen
dc.contributor.authorSiegert, Martin Jen
dc.contributor.authorBingham, Robert Gen
dc.contributor.authorChu, Winnieen
dc.contributor.authorMacKie, Emma Jen
dc.contributor.authorSiegfried, Matthew Ren
dc.contributor.authorVega, Katherine Ien
dc.contributor.authorEmmons, John Ren
dc.contributor.authorWinstein, Keithen
dc.date.accessioned2019-09-10T23:30:33Z
dc.date.available2019-09-10T23:30:33Z
dc.date.issued2019-09-03en
dc.identifier.issn0027-8424
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/296719
dc.description.abstractAirborne radar sounding can measure conditions within and beneath polar ice sheets. In Antarctica, most digital radar-sounding data have been collected in the last 2 decades, limiting our ability to understand processes that govern longer-term ice-sheet behavior. Here, we demonstrate how analog radar data collected over 40 y ago in Antarctica can be combined with modern records to quantify multidecadal changes. Specifically, we digitize over 400,000 line kilometers of exploratory Antarctic radar data originally recorded on 35-mm optical film between 1971 and 1979. We leverage the increased geometric and radiometric resolution of our digitization process to show how these data can be used to identify and investigate hydrologic, geologic, and topographic features beneath and within the ice sheet. To highlight their scientific potential, we compare the digitized data with contemporary radar measurements to reveal that the remnant eastern ice shelf of Thwaites Glacier in West Antarctica had thinned between 10 and 33% between 1978 and 2009. We also release the collection of scanned radargrams in their entirety in a persistent public archive along with updated geolocation data for a subset of the data that reduces themean positioning error from 5 to 2.5 km. Together, these data represent a unique and renewed extensive, multidecadal historical baseline, critical for observing and modeling ice-sheet change on societally relevant timescales.
dc.format.mediumPrint-Electronicen
dc.languageengen
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleMultidecadal observations of the Antarctic ice sheet from restored analog radar records.en
dc.typeArticle
prism.endingPage18873
prism.issueIdentifier38en
prism.publicationDate2019en
prism.publicationNameProceedings of the National Academy of Sciences of the United States of Americaen
prism.startingPage18867
prism.volume116en
dc.identifier.doi10.17863/CAM.43762
dcterms.dateAccepted2019-08-08en
rioxxterms.versionofrecord10.1073/pnas.1821646116en
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2019-09-03en
dc.contributor.orcidSchroeder, Dustin M [0000-0003-1916-3929]
dc.contributor.orcidDowdeswell, Julian [0000-0003-1369-9482]
dc.contributor.orcidSiegfried, Matthew R [0000-0002-0868-4633]
dc.identifier.eissn1091-6490
rioxxterms.typeJournal Article/Reviewen


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Attribution-NonCommercial-NoDerivatives 4.0 International
Except where otherwise noted, this item's licence is described as Attribution-NonCommercial-NoDerivatives 4.0 International