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    Spatial and temporal melt variability at Helheim Glacier, East Greenland, and its effect on ice dynamics

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    Issue Date
    2010-12-29
    Author
    Andersen, Morten L.
    Larsen, Tine B.
    Nettles, Meredith
    Elosegui, Pedro
    van As, D.
    Hamilton, Gordon S.
    Stearns, Leigh A.
    Davis, James L.
    Ahlstrøm, Andreas P.
    de Juan, Julia
    Ekstrom, Göran
    Stenseng, Lars
    Khan, S. Aabbas
    Forsberg, René
    Dahl-Jensen, Dorthe
    Publisher
    American Geophysical Union
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
    Show full item record
    Abstract
    [1] Understanding the behavior of large outlet glaciers draining the Greenland Ice Sheet is critical for assessing the impact of climate change on sea level rise. The flow of marine-terminating outlet glaciers is partly governed by calving-related processes taking place at the terminus but is also influenced by the drainage of surface runoff to the bed through moulins, cracks, and other pathways. To investigate the extent of the latter effect, we develop a distributed surface-energy-balance model for Helheim Glacier, East Greenland, to calculate surface melt and thereby estimate runoff. The model is driven by data from an automatic weather station operated on the glacier during the summers of 2007 and 2008, and calibrated with independent measurements of ablation. Modeled melt varies over the deployment period by as much as 68% relative to the mean, with melt rates approximately 77% higher on the lower reaches of the glacier trunk than on the upper glacier. We compare melt variations during the summer season to estimates of surface velocity derived from global positioning system surveys. Near the front of the glacier, there is a significant correlation (on >95% levels) between variations in runoff (estimated from surface melt) and variations in velocity, with a 1 day delay in velocity relative to melt. Although the velocity changes are small compared to accelerations previously observed following some calving events, our findings suggest that the flow speed of Helheim Glacier is sensitive to changes in runoff. The response is most significant in the heavily crevassed, fast-moving region near the calving front. The delay in the peak of the cross-correlation function implies a transit time of 12–36 h for surface runoff to reach the bed.
    Description
    This is the publisher's version, also available electronically from "http://onlinelibrary.wiley.com".
    URI
    http://hdl.handle.net/1808/17234
    DOI
    https://doi.org/10.1029/2010JF001760
    ISSN
    0148-0227
    Collections
    • Geology Scholarly Works [245]
    Citation
    Andersen, M. L., et al. (2010), Spatial and temporal melt variability at Helheim Glacier, East Greenland, and its effect on ice dynamics, J. Geophys. Res., 115, F04041, http://www.dx.doi.org/10.1029/2010JF001760

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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