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Our goal in this project is to examine the nature and cause of short-term ice velocity changes near Swiss Camp, Greenland. Our work will focus on the interactions between the ice sheet, the atmosphere and the bed through an integrated observational approach which involves borehole geophysics, surface-based GPS and modeling. We propose to: (1) measure changes in the subglacial water system over the summer season using a suite of borehole instrumentation; (2) measure the ice sheet response to changes in basal conditions with surface-based GPS, measured rates of borehole deformation and satellite data; (3) measure englacial and basal temperatures for input into flow models and to constrain estimates of ice deformation and; (4) correlate these data to melt and surface water volume proxies based on remote sensing data, meteorological data available from GC-Net and measured lake volume.

This project is collaborative across three US-based institutions; UT, Dartmouth College (Bob Hawley), NASA (Tom Neumann and Matt Hoffman) and colleagues at ETH in Switzerland (Tinu Luthi and Martin Funk).

Presentations and Publications:

B.F. Morriss, R.L. Hawley, J.W. Chipman, L.C. Andrews, G. Catania, M.J. Hoffman, M.P. Lüthi, T.A. Neumann, 2013, A ten-year record of supraglacial lake evolution and rapid drainage in West Greenland using an automated processing algorithm for multispectral imagery, The Cryosphere, 7, 1869-1877, doi:10.5149/tc-7-1869-2013.

M. Lüthi, C. Ryser, L.C. Andrews, G. Catania, M. Funk, R.L. Hawley, M.J. Hoffman, T.A. Neumann, 2015, Excess heat in the Greenland Ice Sheet: dissipation, temperate paleo-firn and cryo-hydrologic warming, The Cryosphere, 245-253doi:10.5194/tc-9-245-2015.

C. Ryser, M.P. Lüthi, L.C. Andrews, G. Catania, M. Funk, R. Hawley, M. Hoffman, T. Neumann, 2014, Caterpillar-like ice motion in the ablation zone of the Greenland Ice Sheet, Journal of Geophysical Research, doi:10.1002/2013JF003067.

L. Andrews, G. Catania, M. Hoffman, J. Gulley, M. Lüthi, C. Ryser, R. Hawley and T. Neumann, 2014, Direct observations of evolving subglacial drainage beneath the Greenland Ice Sheet, Nature, 514, 80-83, doi:10.1038/nature13796.

C. Ryser, M.P. Lüthi, L.C. Andrews, G. Catania, R. Hawley, T. Neumann, 2014, Sustained high basal motion of the Greenland Ice Sheet revealed by borehole deformation, Journal of Glaciology, 60(222), 647-660.

C. Roosli, F. Walter, S. Husen, L. Andrews, M. Lüthi, G. Catania, E. Kissling, 2014, Sustained seismic tremors and icequakes detected in the ablation zone of the Greenland Ice Sheet, Journal of Glaciology, 60(221), 563-583.

F. Walter, J. Chaput, and M. Lüthi, Thick sediments beneath Greenland's ablation zone and their potential role in future ice sheet dynamics, 2014, Geology, 42(6), doi:10.1130/G35492.1.