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    Fracture propagation to the base of the Greenland Ice Sheet during supraglacial lake drainage

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    DasetalScience2008_revised.pdf (1.825Mb)
    Date
    2008-02-20
    Author
    Das, Sarah B.  Concept link
    Joughin, Ian  Concept link
    Behn, Mark D.  Concept link
    Howat, Ian M.  Concept link
    King, Matt A.  Concept link
    Lizarralde, Daniel  Concept link
    Bhatia, Maya P.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/2506
    As published
    https://doi.org/10.1126/science.1153360
    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.
    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.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Das, Sarah B., Joughin, Ian, Behn, Mark D., Howat, Ian M., King, Matt A., Lizarralde, Daniel, Bhatia, Maya P., "Fracture propagation to the base of the Greenland Ice Sheet during supraglacial lake drainage", 2008-02-20, https://doi.org/10.1126/science.1153360, https://hdl.handle.net/1912/2506
     
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