Using CReSIS airborne RADAR to constrain ice-volume influx across lateral shear margins into the Northeast Greenland Ice Stream.

Mentors:

Peter Burkett, Dr. Sridhar Anandakrishnan

Keywords:

picker program, shear margins, ice-volume flux, isochrones, radar echogram, ice stream

Abstract
The Greenland Ice Sheet (GIS) is one of the largest ice sheets on Earth. Movement of large volumes of ice from stable interior regions to rapidly flowing, calving, or melting margins of this ice sheet can have a significant impact on sea level. The Northeast Greenland Ice Stream (NEGIS) is an unusual ice stream that extends farther inland than any stream on the GIS. NEGIS is widening downglacier due to an influx of ice across its shear margins. The margins of NEGIS are underlain by de-watered zones that restrict the volume of entering ice and maintain the stream’s relative stability. Removal of these restricting bands could lead to a major influx of ice into NEGIS and a significant drawdown of GIS. Through the use of airborne RADAR, we develop a method to quantify the ice-volume influx across the stream’s lateral shear margins. These constraints on ice-volume influx establish a baseline for future studies interested in monitoring NEGIS’ margins and understanding its stability.

Extended Abstract: (.doc) (.pdf)