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dc.contributor.authorCassotto, Ryan
dc.contributor.authorFahnestock, Mark
dc.contributor.authorAmundson, Jason M.
dc.contributor.authorTruffer, Martin
dc.contributor.authorJoughin, Ian
dc.date.accessioned2020-07-12T01:05:08Z
dc.date.available2020-07-12T01:05:08Z
dc.date.issued2014-09-29
dc.identifier.citationCassotto, R., M. Fahnestock, J. M. Amundson, M. Truffer, and I. Joughin (2015), Seasonal and interannual variations in ice melange and its impact on terminus stability, Jakobshavn Isbræ, Greenland, J. Glaciol., 61(225), 76– 88, doi:10.3189/2015JoG13J235.en_US
dc.identifier.urihttp://hdl.handle.net/11122/11187
dc.descriptionWe used satellite-derived surface temperatures and time-lapse photography to infer temporal variations in the proglacial ice melange at Jakobshavn Isbræ, a large and rapidly retreating outlet glacier in Greenland.en_US
dc.description.abstractWe used satellite-derived surface temperatures and time-lapse photography to infer temporal variations in the proglacial ice melange at Jakobshavn Isbræ, a large and rapidly retreating outlet glacier in Greenland. Freezing of the melange-covered fjord surface during winter is indicated by a decrease in fjord surface temperatures and is associated with (1) a decrease in ice melange mobility and (2) a drastic reduction in iceberg production. Vigorous calving resumes in spring, typically abruptly, following the steady up-fjord retreat of the sea-ice/ice-melange margin. An analysis of pixel displacement from time-lapse imagery demonstrates that melange motion increases prior to calving and subsequently decreases following several events. We find that secular changes in ice melange extent, character and persistence can influence iceberg calving, and therefore glacier dynamics over daily-to-monthly timescales, which, if sustained, will influence the mass balance of an ice sheet.en_US
dc.description.sponsorshipThis research was supported by funds from the Gordon and Betty Moore Foundation (GBMF2627), NASA (NNX08AN74G), the US National Science Foundation (ANT0944193 and ANS0909552) and the New Hampshire Space Grant Consortium (NNX10AL97H). We thank CH2M HILL Polar Services and Air Greenland for logistics support, and PASSCAL (Program for the Array Seismic Studies of theContinental Lithosphere) for the use of seismic instrumentation. Ian Joughin derived TerraSAR-X velocities and terminus positions from images provided by the German (DLR) space agency under NASA grant NNX08AL98A. We acknowledgethe use of Rapid Response imagery from the Land Atmosphere Near-real time Capability for EOS (LANCE) system operated by the NASA/GSFC/Earth Science Data and Information System (ESDIS) with funding provided by NASA HQ. Glacier surface elevations were provided by CReSIS, and bed elevations by CReSIS and Mathieu Morlighem. The manuscript was significantly improved by comments from Tim Bartholomaus and an anonymous reviewer.en_US
dc.publisherInternational Glaciological Societyen_US
dc.subjectarctic glaciologyen_US
dc.subjectcalvingen_US
dc.subjectice/ocean interactionsen_US
dc.subjectremote sensingen_US
dc.subjectsea-ice dynamicsen_US
dc.titleSeasonal and interannual variations in ice melange and its impact on terminus stability, Jakobshavn Isbræ, Greenlanden_US
dc.description.peerreviewYesen_US
refterms.dateFOA2020-07-12T01:05:08Z
dc.identifier.journalJournal of Glaciologyen_US


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