Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 302, Issue 3-4, Pages 423-428Publisher
ELSEVIER
DOI: 10.1016/j.epsl.2010.12.037
Keywords
InSAR; Greenland; supraglacial lakes; ice dynamics
Categories
Funding
- Natural Environment Research Council's Centre for Polar Observation and Modelling
- National Centre for Earth Observation
- Natural Environment Research Council [cpom20001, earth010006] Funding Source: researchfish
- NERC [cpom20001] Funding Source: UKRI
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We use interferometric synthetic aperture radar observations recorded in a land-terminating sector of western Greenland to characterise the ice sheet surface hydrology and to quantify spatial variations in the seasonality of ice sheet flow. Our data reveal a non-uniform pattern of late-summer ice speedup that, in places, extends over 100 km inland. We show that the degree of late-summer speedup is positively correlated with modelled runoff within the 10 glacier catchments of our survey, and that the pattern of late-summer speedup follows that of water routed at the ice sheet surface. In late-summer, ice within the largest catchment flows on average 48% faster than during winter, whereas changes in smaller catchments are less pronounced. Our observations show that the routing of seasonal runoff at the ice sheet surface plays an important role in shaping the magnitude and extent of seasonal ice sheet speedup. (c) 2010 Elsevier B.V. All rights reserved.
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