%0 Journal Article %J Geophysical Research Letters %D 2013 %T Rapid Submarine Melting Driven by Subglacial Discharge, LeConte Glacier, Alaska %A Roman J. Motyka %A Dryer, W. P. %A Jason M Amundson %A Martin Truffer %A Mark Fahnestock %K frontal ablation %K submarine melting %K tidewater glaciers %X We show that subglacial freshwater discharge is the principal process driving high rates of submarine melting at tidewater glaciers. This buoyant discharge draws in warm seawater, entraining it in a turbulent upwelling flow along the submarine face that melts glacier ice. To capture the effects of subglacial discharge on submarine melting, we conducted 4 days of hydrographic transects during late summer 2012 at LeConte Glacier, Alaska. A major rainstorm allowed us to document the influence of large changes in subglacial discharge. We found strong submarine melt fluxes that increased from 9.1 ± 1.0 to 16.8 ± 1.3 m d−1 (ice face equivalent frontal ablation) as a result of the rainstorm. With projected continued global warming and increased glacial runoff, our results highlight the direct impact that increases in subglacial discharge will have on tidewater outlet systems. These effects must be considered when modeling glacier response to future warming and increased runoff. %B Geophysical Research Letters %V 40 %G eng %U http://dx.doi.org/10.1002/grl.51011 %R 10.1002/grl.51011 %0 Journal Article %J Journal of Glaciology %D 2012 %T Outlet glacier response to forcing over hourly to interannual timescales, Jakobshavn Isbræ, Greenland %A Podrasky, David %A Martin Truffer %A Mark Fahnestock %A Jason M Amundson %A Cassotto, Ryan %A Ian Joughin %B Journal of Glaciology %V 58 %P 1212 %G eng %R 10.3189/2012JoG12J065 %0 Journal Article %J Journal of Geophysical Research %D 2010 %T Ice mélange dynamics and implications for terminus stability, Jakobshavn Isbræ, Greenland %A Jason M Amundson %A Mark Fahnestock %A Martin Truffer %A Brown, J. %A M P Lüthi %A Roman J. Motyka %B Journal of Geophysical Research %V 115 %P F01005 %G eng %R 10.1029/2009JF001405 %0 Journal Article %J Journal of Glaciology %D 2010 %T A unifying framework for iceberg-calving models %A Jason M Amundson %A Martin Truffer %B Journal of Glaciology %V 56 %P 822–830 %G eng %U http://openurl.ingenta.com/content/xref?genre=article&issn=0022-1430&volume=56&issue=199&spage=822 %0 Journal Article %J Geophysical Research Letters %D 2008 %T Glacier, fjord, and seismic response to recent large calving events, Jakobshavn Isbræ, Greenland %A Jason M Amundson %A Martin Truffer %A M P Lüthi %A Mark Fahnestock %A West, M. %A Roman J. Motyka %B Geophysical Research Letters %V 35 %P L22501 %G eng %U http://www.agu.org/pubs/crossref/2008/2008GL035281.shtml