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    Subglacial discharge at tidewater glaciers revealed by seismic tremor

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    Bartholomaus et al 2015 GRL - ...
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    Author
    Bartholomaus, Timothy C.
    Amundson, Jason M.
    Walter, Jacob I.
    O'Neel, Shad
    West, Michael E.
    Larsen, Christopher F.
    Keyword
    subglacial
    tidewater glaciers
    seismic tremor
    fjord
    glacial basal motion
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/11190
    Abstract
    Subglacial discharge influences glacier basal motion and erodes and redeposits sediment. At tidewater glacier termini, discharge drives submarine terminus melting, affects fjord circulation, and is a central component of proglacial marine ecosystems. However, our present inability to track subglacial discharge and its variability significantly hinders our understanding of these processes. Here we report observations of hourly to seasonal variations in 1.5–10 Hz seismic tremor that strongly correlate with subglacial discharge but not with basal motion, weather, or discrete icequakes. Our data demonstrate that vigorous discharge occurs from tidewater glaciers during summer, in spite of fast basal motion that could limit the formation of subglacial conduits, and then abates during winter. Furthermore, tremor observations and a melt model demonstrate that drainage efficiency of tidewater glaciers evolves seasonally. Glaciohydraulic tremor provides a means by which to quantify subglacial discharge variations and offers a promising window into otherwise obscured glacierized environments.
    Description
    Subglacial discharge influences glacier basal motion and erodes and redeposits sediment. At tidewater glacier termini, discharge drives submarine terminus melting, affects fjord circulation, and is a central component of proglacial marine ecosystems.
    Date
    2015-08-10
    Source
    Research Letter
    Publisher
    American Geophysical Union
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Bartholomaus, T. C., J. M. Amundson, J. I. Walter, S. O’Neel, M. E. West, and C. F. Larsen (2015), Subglacial discharge at tidewater glaciers revealed by seismic tremor, Geophys. Res. Lett., 42, 6391–6398, doi:10.1002/2015GL064590.
    Collections
    Amundson, Jason M.

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