Autor: |
Morlighem M; Department of Earth System Science University of California Irvine CA USA., Williams CN; Bristol Glaciology Centre, School of Geographical Sciences University of Bristol Bristol UK.; Now at British Geological Survey Nottingham UK., Rignot E; Department of Earth System Science University of California Irvine CA USA.; Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA., An L; Department of Earth System Science University of California Irvine CA USA., Arndt JE; Alfred-Wegener-Institute, Helmholtz Centre for Polar and Marine Research Bremerhaven Germany., Bamber JL; Bristol Glaciology Centre, School of Geographical Sciences University of Bristol Bristol UK., Catania G; Institute of Geophysics University of Texas at Austin Austin TX USA., Chauché N; Department of Geography and Earth Science Aberystwyth University Aberystwyth UK., Dowdeswell JA; Scott Polar Research Institute University of Cambridge Cambridge UK., Dorschel B; Alfred-Wegener-Institute, Helmholtz Centre for Polar and Marine Research Bremerhaven Germany., Fenty I; Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA., Hogan K; British Antarctic Survey Natural Environment Research Council Cambridge UK., Howat I; Byrd Polar and Climate Research Center Ohio State University Columbus OH USA., Hubbard A; Department of Geography and Earth Science Aberystwyth University Aberystwyth UK.; Centre for Arctic Gas Hydrate, Environment and Climate, Department of GeosciencesUiT The Arctic University of Norway Tromsø Norway., Jakobsson M; Department of Geology and Geochemistry Stockholm University Stockholm Sweden., Jordan TM; Bristol Glaciology Centre, School of Geographical Sciences University of Bristol Bristol UK., Kjeldsen KK; Centre for GeoGenetics, Natural History Museum of Denmark University of Copenhagen Copenhagen Denmark.; Department of Earth Sciences University of Ottawa Ottawa Ontario Canada.; Department of Geodesy, DTU Space, National Space Institute Technical University of Denmark Kongens Lyngby Denmark., Millan R; Department of Earth System Science University of California Irvine CA USA., Mayer L; Center for Coastal and Ocean Mapping University of New Hampshire Durham NH USA., Mouginot J; Department of Earth System Science University of California Irvine CA USA., Noël BPY; Institute for Marine and Atmospheric Research Utrecht Utrecht University Utrecht Netherlands., O'Cofaigh C; Department of Geography Durham University Durham UK., Palmer S; College of Life and Environmental Sciences University of Exeter Exeter UK., Rysgaard S; Centre for Earth Observation Science, Department of Environment and Geography University of Manitoba Winnipeg Manitoba Canada.; Greenland Institute of Natural Resources Nuuk Greenland.; Arctic Research Centre Aarhus University Aarhus Denmark., Seroussi H; Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA., Siegert MJ; Grantham Institute and Department of Earth Science and Engineering Imperial College London London UK., Slabon P; Alfred-Wegener-Institute, Helmholtz Centre for Polar and Marine Research Bremerhaven Germany., Straneo F; Department of Physical Oceanography Woods Hole Oceanographic Institution Woods Hole MA USA., van den Broeke MR; Institute for Marine and Atmospheric Research Utrecht Utrecht University Utrecht Netherlands., Weinrebe W; Alfred-Wegener-Institute, Helmholtz Centre for Polar and Marine Research Bremerhaven Germany., Wood M; Department of Earth System Science University of California Irvine CA USA., Zinglersen KB; Greenland Institute of Natural Resources Nuuk Greenland. |
Abstrakt: |
Greenland's bed topography is a primary control on ice flow, grounding line migration, calving dynamics, and subglacial drainage. Moreover, fjord bathymetry regulates the penetration of warm Atlantic water (AW) that rapidly melts and undercuts Greenland's marine-terminating glaciers. Here we present a new compilation of Greenland bed topography that assimilates seafloor bathymetry and ice thickness data through a mass conservation approach. A new 150 m horizontal resolution bed topography/bathymetric map of Greenland is constructed with seamless transitions at the ice/ocean interface, yielding major improvements over previous data sets, particularly in the marine-terminating sectors of northwest and southeast Greenland. Our map reveals that the total sea level potential of the Greenland ice sheet is 7.42 ± 0.05 m, which is 7 cm greater than previous estimates. Furthermore, it explains recent calving front response of numerous outlet glaciers and reveals new pathways by which AW can access glaciers with marine-based basins, thereby highlighting sectors of Greenland that are most vulnerable to future oceanic forcing. |