Bedrock Topography and Subglacial Landforms of the North East Greenland Ice Stream

The North East Greenland Ice Stream (NEGIS) is one of the largest ice streams, reaching far inland and draining 12% of the interior Greenland ice mass towards the ocean. Ice flow dynamics and subglacial properties of large parts of the NEGIS are not well studied or understood but are necessary to improve the accuracy of sea-level projections. Here,we present a record of more than 8000km of radar survey lines of radio echo sounding data covering an area of 24 000km^2 centred on the drill site for the East Greenland Ice-core Project (EGRIP) in the central part of the NEGIS. The acquisition system was a multichannel ultra-wideband radar mounted on AWI’s Polar6 aircraft. Our data yield a newdetailedmodel of ice-thickness distribution and basal topography in the region. Subglacial bedrock structures and reflection patterns indicate traces of the activity of the NEGIS such as elongated structures in ice flow direction and features indicating erosion and deposition of sediments