The Northeast Greenland Ice Stream (NEGIS) is the sole interior Greenlandic ice stream. Fast flow initiates near the summit dome, and the ice stream terminates approximately 1000 km downstream in three large outlet glaciers that calve into the Greenland Sea. To better understand this important system, in the summer of 2012 we drilled a 67 m firn core and conducted ground-based radio-echo sounding (RES) and active-source seismic surveys at a site approximately 150 km downstream from the onset of streaming flow (NEGIS firn core, 75°37.61' N, 35°56.49' W). The site is representative of the upper part of the ice stream, while also being in a crevasse-free area for safe surface operations.
Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, Copenhagen 2100, Denmark; Courant Institute of Mathematical Science, New York University, 251 Mercer St, New York, NY 10012, United States; Physics Department, St Olaf College, 1520 St Olaf Ave, Northfield, MN 55057, United States; Department of Geosciences, Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA 16802-6813, United States; Department of Geosciences, University of Massachusetts Amherst, 611 North Pleasant St., Amherst, MA 01003-9297, United States; Alfred Wegener Institute, Am Handelshafen 12, 27570 Bremerhaven, Germany
Recommended Citation:
Vallelonga P,, Christianson K,, Alley R,et al. Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS)[J]. Cryosphere,2014-01-01,8(4)