Seasonal evolution of subglacial drainage and acceleration in a Greenland outlet glacier

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dc.contributor.author Nienow, Peter
dc.contributor.author Sole, Andrew
dc.contributor.author Bartholomew, Ian
dc.contributor.author Hubbard, Alun L.
dc.contributor.author Mair, Douglas
dc.contributor.author King, Matt A.
dc.date.accessioned 2011-05-24T11:06:38Z
dc.date.available 2011-05-24T11:06:38Z
dc.date.issued 2010-06
dc.identifier.citation Nienow , P , Sole , A , Bartholomew , I , Hubbard , A L , Mair , D & King , M A 2010 , ' Seasonal evolution of subglacial drainage and acceleration in a Greenland outlet glacier ' Nature Geoscience , vol 55 , no. 189 , pp. 408-411 . , 10.1038/NGEO863 en
dc.identifier.issn 1752-0908
dc.identifier.other PURE: 161747
dc.identifier.other dspace: 2160/6792
dc.identifier.uri http://hdl.handle.net/2160/6792
dc.description Bartholomew, I., Nienow, P., Mair, D., Hubbard, A., King, M. A., Sole, A. (2010). Seasonal evolution of subglacial drainage and acceleration in a Greenland outlet glacier. Nature Geoscience, 3(6), 408-411. Sponsorship: UK Natural Environment Research Council (NERC); Edinburgh University Moss Centenary Scholarship; Edinburgh University Small Project Grants; Carnegie Foundation; SKB Sweden; Royal Geographical Society Dudley Stamp Memorial Award; Research Councils UK Academic Fellowship; Aberystwyth University Research Award; Royal Society Research Grant; Royal Geographical Society Gilchrist Fieldwork Grant en
dc.description.abstract The Greenland ice sheet contains enough water to raise sea levels by 7 m. However, its present mass balance and future contribution to sea level rise is poorly understood(1). Accelerated mass loss has been observed near the ice sheet margin, partly as a result of faster ice motion(2-4). Surface melt waters can reach the base of the ice sheet and enhance basal ice motion(5,6). However, the response of ice motion to seasonal variations in meltwater supply is poorly constrained both in space and time. Here we present ice motion data obtained with global positioning system receivers located along a similar to 35 km transect at the western margin of the Greenland ice sheet throughout a summer melt season. Our measurements reveal substantial increases in ice velocity during summer, up to 220% above winter background values. These speed-up events migrate up the glacier over the course of the summer. The relationship between melt and ice motion varies both at each site throughout the melt season and between sites. We suggest that these patterns can be explained by the seasonal evolution of the subglacial drainage system similar to hydraulic forcing mechanisms for ice dynamics that have been observed at smaller glaciers. en
dc.format.extent 4 en
dc.language.iso eng
dc.relation.ispartof Nature Geoscience en
dc.title Seasonal evolution of subglacial drainage and acceleration in a Greenland outlet glacier en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1038/NGEO863
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Centre for Glaciology en
dc.description.status Peer reviewed en


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