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    Near-surface environmentally forced changes in the Ross Ice Shelf observed with ambient seismic noise

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    Article (4.429Mb)
    Supporting Information S1 (55.08Mb)
    Date
    2018-10-16
    Author
    Chaput, Julien  Concept link
    Aster, Richard C.  Concept link
    McGrath, Daniel  Concept link
    Baker, Michael G.  Concept link
    Anthony, Robert E.  Concept link
    Gerstoft, Peter  Concept link
    Bromirski, Peter D.  Concept link
    Nyblade, Andrew A.  Concept link
    Stephen, Ralph A.  Concept link
    Wiens, Douglas A.  Concept link
    Das, Sarah B.  Concept link
    Stevens, Laura A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/10795
    As published
    https://doi.org/10.1029/2018GL079665
    DOI
    10.1029/2018GL079665
    Keyword
     Ross Ice Shelf; Antarctica; Firn; Ambient noise; Temporal monitoring; Resonances 
    Abstract
    Continuous seismic observations across the Ross Ice Shelf reveal ubiquitous ambient resonances at frequencies >5 Hz. These firn‐trapped surface wave signals arise through wind and snow bedform interactions coupled with very low velocity structures. Progressive and long‐term spectral changes are associated with surface snow redistribution by wind and with a January 2016 regional melt event. Modeling demonstrates high spectral sensitivity to near‐surface (top several meters) elastic parameters. We propose that spectral peak changes arise from surface snow redistribution in wind events and to velocity drops reflecting snow lattice weakening near 0°C for the melt event. Percolation‐related refrozen layers and layer thinning may also contribute to long‐term spectral changes after the melt event. Single‐station observations are inverted for elastic structure for multiple stations across the ice shelf. High‐frequency ambient noise seismology presents opportunities for continuous assessment of near‐surface ice shelf or other firn environments.
    Description
    Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 45 (2018): 11,187-11,196, doi:10.1029/2018GL079665.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Geophysical Research Letters 45 (2018): 11,187-11,196
     

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