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    Meltwater Intrusions Reveal Mechanisms for Rapid Submarine Melt at a Tidewater Glacier

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    Jackson et al 2020 GRL - Jason ...
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    Author
    Kienholtz, C.
    Sutherland, D. A.
    Jackson, R. H.
    Nash, J. D.
    Amundson, Jason M.
    Motyka, R. J.
    Winters, D.
    Skyllingstad, E.
    Pettit, E. C.
    Keyword
    meltwater intrusions
    submarine melting
    sea level rise
    parameterizations
    tidewater glaciers
    termini
    subglacial discharge
    ocean-glacier interactions
    glaciers
    Metadata
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    URI
    http://hdl.handle.net/11122/10935
    Abstract
    Submarine melting has been implicated as a driver of glacier retreat and sea level rise, but to date melting has been difficult to observe and quantify. As a result, melt rates have been estimated from parameterizations that are largely unconstrained by observations, particularly at the near-vertical termini of tidewater glaciers. With standard coefficients, these melt parameterizations predict that ambient melting (the melt away from subglacial discharge outlets) is negligible compared to discharge-driven melting for typical tidewater glaciers. Here, we present new data from LeConte Glacier, Alaska, that challenges this paradigm. Using autonomous kayaks, we observe ambient meltwater intrusions that are ubiquitous within 400 m of the terminus, and we provide the first characterization of their properties, structure, and distribution. Our results suggest that ambient melt rates are substantially higher (×100) than standard theory predicts and that ambient melting is a significant part of the total submarine melt flux. We explore modifications to the prevalent melt parameterization to provide a path forward for improved modeling of ocean-glacier interactions.
    Date
    2019-11-25
    Source
    Research Letter
    Publisher
    American Geophysical Union
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Jackson, R. H., Nash, J. D., Kienholz, C., Sutherland, D. A., Amundson, J. M., Motyka, R. J., et al. (2020). Meltwater intrusions reveal mechanisms for rapid submarine melt at a tidewater glacier. Geophysical Research Letters, 47, e2019GL085335. https://doi.org/10.1029/2019GL085335
    Collections
    Kienholz, Christian
    Amundson, Jason M.

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