期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 21, 页码 11051-11061出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL074954
关键词
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资金
- National Aeronautics and Space Administration, Cryospheric Sciences Program [NNX15AD55G]
- National Science Foundation's ARCSS program [1504230]
- University of Bristol as part of the Basal Properties of the Greenland Ice Sheet project (BPoG, NERC grant) [NE/M000869/1]
- NERC [NE/K004999/1, bas0100030, NE/H020667/1, NE/K004956/2, NE/D001986/1, NE/M000869/1] Funding Source: UKRI
- Natural Environment Research Council [bas0100030, NE/K004956/2, NE/M000869/1, NE/H020667/1, NER/T/S/2000/00986, NE/D001986/1, NE/K004999/1] Funding Source: researchfish
- Directorate For Geosciences
- ICER [1541390] Funding Source: National Science Foundation
- Directorate For Geosciences
- ICER [1743687] Funding Source: National Science Foundation
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1504230] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1417787] Funding Source: National Science Foundation
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 150m 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 7.420.05m, which is 7cm 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.
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