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dc.contributor.authorBanwell, Alisonen
dc.contributor.authorMacAyeal, Douglas Ren
dc.date.accessioned2015-07-15T13:51:02Z
dc.date.available2015-07-15T13:51:02Z
dc.date.issued2015-07-20en
dc.identifier.citationAntarctic Science 2015, 27(6):587-597. doi:10.1017/S0954102015000292en
dc.identifier.issn0954-1020
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/248979
dc.description.abstractUsing a previously-derived treatment of viscoelastic flexure of floating ice shelves, we simulate multiple years of evolution of a single, axisymmetric supraglacial lake when it is subjected to annual fill/drain cycles. Our viscoelastic treatment follows the assumptions of the well-known thin-beam and thin-plate analysis but, crucially, also covers power-law creep rheology. As the ice-shelf surface does not completely return to its un-flexed position after a 1-year fill/drain cycle, the lake basin deepens with each successive cycle. This deepening process is significantly amplified when lake-bottom ablation is taken into account. We evaluate the time-scale over which a typical lake reaches a sufficient depth such that ice-shelf fracture can occur well beyond the lake itself in response to lake filling/drainage. We show that, although this is unlikely during one fill/drain cycle, fracture is possible after multiple years assuming surface meltwater availability is unlimited. This extended zone of potential fracture implies that flexural stresses in response to a single lake filling/drainage event can cause neighbouring lakes to drain, which, in turn, can cause lakes farther afield to drain. Such self-stimulating behaviour may have accounted for the sudden, widespread appearance of a fracture system that drove the Larsen B Ice Shelf to break-up in 2002.
dc.description.sponsorshipAlison Banwell acknowledges the support of an Antarctic Science International Bursary from Antarctic Science Ltd. and a Bowring Junior Research Fellowship from St Catharine’s College, Cambridge.
dc.languageEnglishen
dc.language.isoenen
dc.publisherCambridge University Press
dc.rightsAttribution-NonCommercial 2.0 UK: England & Wales*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/2.0/uk/*
dc.subjectice-shelf instabilityen
dc.subjectviscoelasticityen
dc.subjectmelt pondsen
dc.subjecthydrofractureen
dc.subjectAntarcticaen
dc.titleIce-shelf fracture due to viscoelastic-flexure stress induced by fill/drain cycles of supraglacial lakesen
dc.typeArticle
dc.description.versionThis is the author accepted manuscript. The final version is available from Cambridge University Press via http://dx.doi.org/10.1017/S0954102015000292en
prism.endingPage597
prism.publicationDate2015en
prism.publicationNameAntarctic Scienceen
prism.startingPage587
prism.volume27en
rioxxterms.versionofrecord10.1017/S0954102015000292en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2015-07-20en
dc.contributor.orcidBanwell, Alison [0000-0001-9545-829X]
dc.identifier.eissn1365-2079
rioxxterms.typeJournal Article/Reviewen
rioxxterms.freetoread.startdate2016-01-20


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Attribution-NonCommercial 2.0 UK: England & Wales
Except where otherwise noted, this item's licence is described as Attribution-NonCommercial 2.0 UK: England & Wales