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dc.contributor.authorReinardy, Benedict
dc.contributor.authorBooth, Adam
dc.contributor.authorHughes, Anna
dc.contributor.authorBoston, Clare
dc.contributor.authorAkesson, Henning
dc.contributor.authorBakke, Jostein
dc.contributor.authorNesje, Atle
dc.contributor.authorGiesen, Rianne
dc.contributor.authorPearce, Danni
dc.date.accessioned2019-03-19T15:07:49Z
dc.date.available2019-03-19T15:07:49Z
dc.date.issued2019-03-07
dc.identifier.citationReinardy , B , Booth , A , Hughes , A , Boston , C , Akesson , H , Bakke , J , Nesje , A , Giesen , R & Pearce , D 2019 , ' Pervasive cold ice within a temperate glacier-implications for glacier thermal regimes, sediment transport and foreland geomorphology ' , The Cryosphere , vol. 13 , no. 3 , pp. 827-843 . https://doi.org/10.5194/tc-13-827-2019
dc.identifier.issn1994-0416
dc.identifier.otherPURE: 15324372
dc.identifier.otherPURE UUID: d6e0571e-5fa3-404e-a149-ccb88ea6f679
dc.identifier.otherScopus: 85062734526
dc.identifier.otherORCID: /0000-0002-6889-224X/work/62752116
dc.identifier.urihttp://hdl.handle.net/2299/21205
dc.description© Author(s) 2019. Published by Copernicus Publications on behalf of the European Geosciences Union.
dc.description.abstractThis study suggests that cold-ice processes may be more widespread than previously assumed, even within temperate glacial systems. We present the first systematic mapping of cold ice at the snout of the temperate glacier Midtdalsbreen, an outlet of the Hardangerjøkulen icefield (Norway), from 43 line kilometres of ground-penetrating radar data. Results show a 40 m wide cold-ice zone within the majority of the glacier snout, where ice thickness is <10 m. We interpret ice to be cold-based across this zone, consistent with basal freeze-on processes involved in the deposition of moraines. We also find at least two zones of cold ice up to 15 m thick within the ablation area, occasionally extending to the glacier bed. There are two further zones of cold ice up to 30 m thick in the accumulation area, also extending to the glacier bed. Cold-ice zones in the ablation area tend to correspond to areas of the glacier that are covered by late-lying seasonal snow patches that reoccur over multiple years. Subglacial topography and the location of the freezing isotherm within the glacier and underlying subglacial strata likely influence the transport and supply of supraglacial debris and formation of controlled moraines. The wider implication of this study is the possibility that, with continued climate warming, temperate environments with primarily temperate glaciers could become polythermal in forthcoming decades with (i) persisting thinning and (ii) retreat to higher altitudes where subglacial permafrost could be and/or become more widespread. Adversely, the number and size of late-lying snow patches in ablation areas may decrease and thereby reduce the extent of cold ice, reinforcing the postulated change in the thermal regime.en
dc.format.extent17
dc.language.isoeng
dc.relation.ispartofThe Cryosphere
dc.rightsOpen
dc.subjectWater Science and Technology
dc.subjectEarth-Surface Processes
dc.titlePervasive cold ice within a temperate glacier-implications for glacier thermal regimes, sediment transport and foreland geomorphologyen
dc.contributor.institutionDepartment of Biological and Environmental Sciences
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85062734526&partnerID=8YFLogxK
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2019-03-07
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.5194/tc-13-827-2019
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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