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    Rapid submarine melting driven by subglacial discharge, LeConte Glacier, Alaska

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    Name:
    Motyka et al 2013 GRL - Jason ...
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    Author
    Motyka, R. J.
    Dryer, William P.
    Amundson, Jason M.
    Truffer, Martin
    Fahnestock, Mark
    Keyword
    glacial
    submarine melting
    subglacial discharge
    LeConte Glacier
    tidewater glaciers
    heat potential
    glaicers
    glacial ice
    Metadata
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    URI
    http://hdl.handle.net/11122/11179
    Abstract
    We show that subglacial freshwater discharge is the principal process driving high rates of submarine melting at tidewater glaciers. This buoyant discharge draws in warm seawater, entraining it in a turbulent upwelling flow along the submarine face that melts glacier ice. To capture the effects of subglacial discharge on submarine melting, we conducted 4 days of hydrographic transects during late summer 2012 at LeConte Glacier, Alaska. A major rainstorm allowed us to document the influence of large changes in subglacial discharge. We found strong submarine melt fluxes that increased from 9.1 ± 1.0 to 16.8 ± 1.3 m d1 (ice face equivalent frontal ablation) as a result of the rainstorm. With projected continued global warming and increased glacial runoff, our results highlight the direct impact that increases in subglacial discharge will have on tidewater outlet systems. These effects must be considered when modeling glacier response to future warming and increased runoff.
    Description
    We show that subglacial freshwater discharge is the principal process driving high rates of submarine melting at tidewater glaciers.
    Date
    2013-09-27
    Publisher
    American Geophysical Union
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Motyka, R. J., Dryer, W. P., Amundson, J., Truffer, M. & Fahnestock, M. Rapid submarine melting driven by subglacial discharge, LeConte glacier, Alaska. Geophys. Res. Lett. 40, 5153–5158 (2013).
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    Amundson, Jason M.

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