Near-surface environmentally forced changes in the Ross Ice Shelf observed with ambient seismic noise
Aster, Richard C.
Baker, Michael G.
Anthony, Robert E.
Bromirski, Peter D.
Nyblade, Andrew A.
Stephen, Ralph A.
Wiens, Douglas A.
Das, Sarah B.
Stevens, Laura A.
MetadataShow full item record
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.
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.
Suggested CitationArticle: Chaput, Julien, Aster, Richard C., McGrath, Daniel, Baker, Michael G., Anthony, Robert E., Gerstoft, Peter, Bromirski, Peter D., Nyblade, Andrew A., Stephen, Ralph A., Wiens, Douglas A., Das, Sarah B., Stevens, Laura A., "Near-surface environmentally forced changes in the Ross Ice Shelf observed with ambient seismic noise", Geophysical Research Letters 45 (2018): 11,187-11,196, DOI:10.1029/2018GL079665, https://hdl.handle.net/1912/10795
Showing items related by title, author, creator and subject.
Ice shelf structure derived from dispersion curve analysis of ambient seismic noise, Ross Ice Shelf, Antarctica Diez, Anja; Bromirski, Peter D.; Gerstoft, Peter; Stephen, Ralph A.; Anthony, Robert E.; Aster, Richard C.; Cai, Chen; Nyblade, Andrew A.; Wiens, Douglas A. (Oxford University Press, 2016-02-16)An L-configured, three-component short period seismic array was deployed on the Ross Ice Shelf, Antarctica during November 2014. Polarization analysis of ambient noise data from these stations shows linearly polarized waves ...
Horner, Tristan J.; Pryer, Helena V.; Nielsen, Sune G.; Crockford, Peter W.; Gauglitz, Julia M.; Wing, Boswell A.; Ricketts, Richard D. (Nature Publishing Group, 2018-01-18)Correction to: Nature Communications https://doi.org/10.1038/s41467-017-01229-5, Article published online 07 November 2017
Horner, Tristan J.; Pryer, Helena V.; Nielsen, Sune G.; Crockford, Peter W.; Gauglitz, Julia M.; Wing, Boswell A.; Ricketts, Richard D. (Nature Publishing Group, 2017-11-07)Geochemical analyses of sedimentary barites (barium sulfates) in the geological record have yielded fundamental insights into the chemistry of the Archean environment and evolutionary origin of microbial metabolisms. ...