| Autor: |
Karlsson NB; Geological Survey of Denmark and Greenland, Copenhagen, Denmark. nbk@geus.dk., Solgaard AM; Geological Survey of Denmark and Greenland, Copenhagen, Denmark., Mankoff KD; Geological Survey of Denmark and Greenland, Copenhagen, Denmark., Gillet-Chaulet F; University of Grenoble Alpes, CNRS, IGE, Grenoble, France., MacGregor JA; Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA., Box JE; Geological Survey of Denmark and Greenland, Copenhagen, Denmark., Citterio M; Geological Survey of Denmark and Greenland, Copenhagen, Denmark., Colgan WT; Geological Survey of Denmark and Greenland, Copenhagen, Denmark., Larsen SH; Geological Survey of Denmark and Greenland, Copenhagen, Denmark., Kjeldsen KK; Geological Survey of Denmark and Greenland, Copenhagen, Denmark., Korsgaard NJ; Geological Survey of Denmark and Greenland, Copenhagen, Denmark., Benn DI; School of Geography & Sustainable Development, University of St. Andrews, St. Andrews, UK., Hewitt IJ; Oxford Centre for Industrial and Applied Mathematics, University of Oxford, Oxford, UK., Fausto RS; Geological Survey of Denmark and Greenland, Copenhagen, Denmark. |
| Abstrakt: |
The Greenland ice sheet has been one of the largest sources of sea-level rise since the early 2000s. However, basal melt has not been included explicitly in assessments of ice-sheet mass loss so far. Here, we present the first estimate of the total and regional basal melt produced by the ice sheet and the recent change in basal melt through time. We find that the ice sheet's present basal melt production is 21.4 +4.4/-4.0 Gt per year, and that melt generated by basal friction is responsible for about half of this volume. We estimate that basal melting has increased by 2.9 ± 5.2 Gt during the first decade of the 2000s. As the Arctic warms, we anticipate that basal melt will continue to increase due to faster ice flow and more surface melting thus compounding current mass loss trends, enhancing solid ice discharge, and modifying fjord circulation. |
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