Journal
ANNALS OF GLACIOLOGY
Volume 61, Issue 81, Pages 143-153Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/aog.2020.12
Keywords
Glacial geomorphology; glacier flow; ice streams; processes and landforms of glacial erosion; radio-echo sounding
Funding
- Denmark (A. P. Moller Foundation)
- Denmark (University of Copenhagen)
- USA (U.S. National Science Foundation, Office of Polar Programs)
- Germany (Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research)
- Japan (National Institute of Polar Research)
- Norway (University of Bergen)
- Norway (Bergen Research Foundation)
- Switzerland (Swiss National Science Foundation)
- France (French Polar Institute Paul-Emile Victor, Institute for Geosciences and Environmental research)
- China (Chinese Academy of Sciences)
- China (Beijing Normal University)
- State of Kansas
- NASA Operation IceBridge grant [NNX16AH54G]
- NSF [ACI-1443054]
- Japan (Arctic Challenge for Sustainability)
- NASA [901711, NNX16AH54G] Funding Source: Federal RePORTER
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The Northeast Greenland Ice Stream (NEGIS) is an important dynamic component for the total mass balance of the Greenland ice sheet, as it reaches up to the central divide and drains 12% of the ice sheet. The geometric boundary conditions and in particular the nature of the subglacial bed of the NEGIS are essential to understand its ice flow dynamics. We present a record of more than 8000 km of radar survey lines of multi-channel, ultra-wideband radio echo sounding data covering an area of 24 000 km(2), centered on the drill site for the East Greenland Ice-core Project (EGRIP), in the upper part of the NEGIS catchment. Our data yield a new detailed model of ice-thickness distribution and basal topography in the region. The enhanced resolution of our bed topography model shows features which we interpret to be caused by erosional activity, potentially over several glacial-interglacial cycles. Off-nadir reflections from the ice-bed interface in the center of the ice stream indicate a streamlined bed with elongated subglacial landforms. Our new bed topography model will help to improve the basal boundary conditions of NEGIS prescribed for ice flow models and thus foster an improved understanding of the ice-dynamic setting.
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