Bedrock displacements in Greenland manifest ice mass variations, climate cycles and climate change

Publication: Research - peer-reviewJournal article – Annual report year: 2012

  • Author: Bevis, Michael

    Ohio State University, United States

  • Author: Wahr, John

    Department of Physics, University of Colorado, United States

  • Author: Khan, Shfaqat Abbas

    Geodesy, National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Madsen, Finn Bo

    Geodesy, National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Brown, Abel

    Ohio State University, United States

  • Author: Willis, Michael

    Cornell University, United States

  • Author: Kendrick, Eric

    Ohio State University, United States

  • Author: Knudsen, Per

    Geodesy, National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Box, Jason E.

    Ohio State University, United States

  • Author: van Dam, Tonie

    Faculté de Sciences, University of Luxembourg, Luxembourg

  • Author: Caccamise, Dana J., II

    Ohio State University, United States

  • Author: Johns, Bjorn

    UNAVCO Inc., United States

  • Author: Nylen, Thomas

    UNAVCO Inc., United States

  • Author: Abbott, Robin

    Polar Field Services, United States

  • Author: White, Seth

    UNAVCO Inc., United States

  • Author: Miner, Jeremy

    UNAVCO Inc., United States

  • Author: Forsberg, René

    Geodynamics, National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Zhou, Hao

    Ohio State University, United States

  • Author: Wang, Jian

    Ohio State University, United States

  • Author: Wilson, Terry

    Ohio State University, United States

  • Author: Bromwich, David

    Ohio State University, United States

  • Author: Francis, Olivier

    Faculté de Sciences, University of Luxembourg, Luxembourg

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The Greenland GPS Network (GNET) uses the Global Positioning System (GPS) to measure the displacement of bedrock exposed near the margins of the Greenland ice sheet. The entire network is uplifting in response to past and present-day changes in ice mass. Crustal displacement is largely accounted for by an annual oscillation superimposed on a sustained trend. The oscillation is driven by earth’s elastic response to seasonal variations in ice mass and air mass (i.e., atmospheric pressure). Observed vertical velocities are higher and often much higher than predicted rates of postglacial rebound (PGR), implying that uplift is usually dominated by the solid earth’s instantaneous elastic response to contemporary losses in ice mass rather than PGR. Superimposed on longer-term trends, an anomalous ‘pulse’ of uplift accumulated at many GNET stations during an approximate six-month period in 2010. This anomalous uplift is spatially correlated with the 2010 melting day anomaly.
Original languageEnglish
JournalNational Academy of Sciences. Proceedings
Publication date2012
Volume109
Issue30
Pages11944-11948
ISSN0027-8424
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 16

Keywords

  • Climate change, Climate cycles, Elasticity, Crustal motion geodesy
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