Fracture propagation to the base of the Greenland Ice Sheet during supraglacial lake drainage Das, Sarah B. Joughin, Ian Behn, Mark D. Howat, Ian M. King, Matt A. Lizarralde, Daniel Bhatia, Maya P. 2008-10-17T16:11:26Z 2008-10-17T16:11:26Z 2008-02-20
dc.description Author Posting. © The Authors, 2008. This is the author's version of the work. It is posted here by permission of American Association for the Advancement of Science for personal use, not for redistribution. The definitive version was published in Science 320 (2008): 778-781, doi:10.1126/science.1153360. en
dc.description.abstract Surface meltwater that reaches the base of an ice sheet creates a mechanism for the rapid response of ice flow to climate change. The process whereby such a pathway is created through thick, cold ice has not, however, been previously observed. We describe the rapid (<2 hours) drainage of a large supraglacial lake down 980 m through to the bed of the Greenland Ice Sheet initiated by water-driven fracture propagation evolving into moulin flow. Drainage coincided with increased seismicity, transient acceleration, ice sheet uplift and horizontal displacement. Subsidence and deceleration occurred over the following 24 hours. The short-lived dynamic response suggests an efficient drainage system dispersed the meltwater subglacially. The integrated effect of multiple lake drainages could explain the observed net regional summer ice speedup. en
dc.description.sponsorship Support was provided jointly by NSF and NASA through ARC-0520077 (S.B.D., M.P.B., I.M.H.) and ARC- 520382 (I.J.); The WHOI OCCI and Clark Arctic Research Initiative provided additional support to S.B.D., M.D.B., and D.L.; and a NERC (UK) Research Fellowship supported M.A.K. en
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.title Fracture propagation to the base of the Greenland Ice Sheet during supraglacial lake drainage en
dc.type Preprint en
dspace.entity.type Publication
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