Hybrid inventory, gravimetry and altimetry (HIGA) mass balance product for Greenland and the Canadian Arctic

Research output: Research - peer-reviewJournal article – Annual report year: 2015

  • Author: Colgan, William

    Geological Survey of Denmark and Greenland, Denmark

  • Author: Abdalati, W.

    University of Colorado, United States

  • Author: Citterio, M.

    Geological Survey of Denmark and Greenland, Denmark

  • Author: Csatho, B.

    SUNY - The State University of New York, United States

  • Author: Fettweis, X.

    University of Liege, Belgium

  • Author: Luthcke, S. B.

    NASA Goddard Space Flight Center, United States

  • Author: Moholdt, G.

    University of California at San Diego, United States

  • Author: Stober, M.

    Stuttgart Technology University of Applied Sciences, Germany

  • Author: Simonsen, Sebastian Bjerregaard

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

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We present a novel inversion algorithm that generates a mass balance field that is simultaneously consistent with independent observations of glacier inventory derived from optical imagery, cryosphere-attributed mass trends derived from satellite gravimetry, and ice surface elevation trends derived from airborne and satellite altimetry. We use this algorithm to assess mass balance across Greenland and the Canadian Arctic over the Sep-2003 to Oct-2009 period at 26 km resolution. We evaluate local algorithm-inferred mass balance against forty in situ point observations. This evaluation yields an RMSE of 0.15 mWE/a, and highlights a paucity of in situ observations from regions of high dynamic mass loss and peripheral glaciers. We assess mass losses of 212 ± 67 Gt/a to the Greenland ice sheet proper, 38 ± 11 Gt/a to peripheral glaciers in Greenland, and 42 ± 11 Gt/a to glaciers in the Canadian Arctic. These magnitudes of mass loss are dependent on the gravimetry-derived spherical harmonic mass trend we invert. We spatially partition the transient glacier continuity equation by differencing algorithm-inferred mass balance from modeled surface mass balance, in order to solve the horizontal divergence of ice flux as a residual. This residual ice dynamic field infers flux divergence (or submergent flow) in the ice sheet accumulation area and at tidewater margins, and flux convergence (or emergent flow) in land-terminating ablation areas, which is consistent with continuum mechanics theory.
Original languageEnglish
JournalRemote Sensing of Environment
Volume168
Pages (from-to)24-39
ISSN0034-4257
DOIs
StatePublished - 2015
CitationsWeb of Science® Times Cited: 5

    Research areas

  • Gravimetry, Altimetry, Glacier, Ice sheet, Canada, Greenland, Mass balance
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