Show simple item record D. en_US Alun L. en_US A. en_US H. en_US 2008-12-10T12:37:53Z 2008-12-10T12:37:53Z 2006-09 en_US
dc.identifier en_US
dc.identifier.citation Sugden , D , Hubbard , A L , Dugmore , A & Norddahl , H 2006 , ' A modelling insight into the Icelandic Last Glacial Maximum ice sheet ' Quaternary Science Reviews , vol 25 , no. 17-18 , pp. 2283-2296 . , 10.1016/j.quascirev.2006.04.001 en_US
dc.identifier.other PURE: 94327 en_US
dc.identifier.other dspace: 2160/1510 en_US
dc.description.abstract A three-dimensional thermomechanical model is used to investigate the Last Glacial Maximum (LGM) Icelandic ice sheet and the climate responsible for it at . A series of sensitivity experiments reveal that Iceland is susceptible to the onset large-scale glaciation with only a 3 °C cooling perturbation relative to recent (1961–1990) climate. A 5 °C cooling perturbation is enough to force an ice sheet to beyond the present day coastline in virtually all sectors. A suite of 15 experiments driven by a GRIP time-series for 15,000 years from a climatic optimum at 36 ka to 21 ka BP scaled with 5.0–15.0 °C maximum cooling perturbation are initiated in order to identify a best-fit LGM ice sheet configuration compatible with the available empirical evidence. The optimum LGM model isolated requires an annual cooling of 10.0–12.5 °C relative to the recent climatology with over 50% precipitation suppression across the north and yields an extensive offshore ice sheet with an area of and a volume of . Over-extension of ice extent across the northern shelf is addressed by the introduction of strong aridity across this region but otherwise the ice-sheet is well pinned to the continental shelf-break in remaining sectors which tends to decouple it from further climatic forcing. The optimum LGM ice-sheet has a substantial proportion of its base grounded below sea-level and is dominated by basal sliding which activates extensive zones of fast flow. This results in a highly dynamic, low aspect ice sheet with a mean ice thickness of 940 m and a plateau elevation of breached by numerous nunataks and ice-free zones providing potential, but spatially limited and frigid, ecological refugia through the vicissitudes of the LGM. en_US
dc.format.extent 14 en_US
dc.relation.ispartof Quaternary Science Reviews en_US
dc.title A modelling insight into the Icelandic Last Glacial Maximum ice sheet en_US
dc.contributor.pbl Institute of Geography & Earth Sciences en_US
dc.contributor.pbl Centre for Glaciology en_US

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