%0 Journal Article %J Science Advances %D 2019 %T Contribution of the Greenland Ice Sheet to sea level over the next millennium %A Aschwanden, Andy %A Fahnestock, Mark A. %A Truffer, Martin %A Brinkerhoff, Douglas J. %A Hock, Regine %A Khroulev, Constantine %A Mottram, Ruth %A Khan, S. Abbas %X The Greenland Ice Sheet holds 7.2 m of sea level equivalent and in recent decades, rising temperatures have led to accelerated mass loss. Current ice margin recession is led by the retreat of outlet glaciers, large rivers of ice ending in narrow fjords that drain the interior. We pair an outlet glacier–resolving ice sheet model with a comprehensive uncertainty quantification to estimate Greenland's contribution to sea level over the next millennium. We find that Greenland could contribute 5 to 33 cm to sea level by 2100, with discharge from outlet glaciers contributing 8 to 45% of total mass loss. Our analysis shows that uncertainties in projecting mass loss are dominated by uncertainties in climate scenarios and surface processes, whereas uncertainties in calving and frontal melt play a minor role. We project that Greenland will very likely become ice free within a millennium without substantial reductions in greenhouse gas emissions. %B Science Advances %V 5 %P eaav9396 %8 jun %G eng %U http://advances.sciencemag.org/lookup/doi/10.1126/sciadv.aav9396 %R 10.1126/sciadv.aav9396 %0 Journal Article %J Journal of Glaciology %D 2017 %T Acquisition of a 3 min, two-dimensional glacier velocity field with terrestrial radar interferometry %A Voytenko, Denis %A Dixon, Timothy H. %A Holland, David M. %A Cassotto, Ryan %A Howat, Ian M. %A Fahnestock, Mark A. %A Truffer, Martin %A De La Peña, Santiago %K glacier flow %K glacier geophysics %K glaciological instruments and methods %X {\textless}p{\textgreater}Outlet glaciers undergo rapid spatial and temporal changes in flow velocity during calving events. Observing such changes requires both high temporal and high spatial resolution methods, something now possible with terrestrial radar interferometry. While a single such radar provides line-of-sight velocity, two radars define both components of the horizontal flow field. To assess the feasibility of obtaining the two-dimensional (2-D) flow field, we deployed two terrestrial radar interferometers at Jakobshavn Isbrae, a major outlet glacier on Greenland's west coast, in the summer of 2012. Here, we develop and demonstrate a method to combine the line-of-sight velocity data from two synchronized radars to produce a 2-D velocity field from a single (3 min) interferogram. Results are compared with the more traditional feature-tracking data obtained from the same radar, averaged over a longer period. We demonstrate the potential and limitations of this new dual-radar approach for obtaining high spatial and temporal resolution 2-D velocity fields at outlet glaciers.{\textless}/p{\textgreater} %B Journal of Glaciology %P 1–8 %G eng %U https://www.cambridge.org/core/product/identifier/S0022143017000284/type/journal{\_}article %R 10.1017/jog.2017.28 %0 Journal Article %J Journal of Geophysical Research: Earth Surface %D 2016 %T A synthesis of the basal thermal state of the Greenland Ice Sheet %A MacGregor, Joseph A. %A Fahnestock, Mark A. %A Catania, Ginny A. %A Aschwanden, Andy %A Clow, Gary D. %A Colgan, William T. %A Gogineni, S. Prasad %A Morlighem, Mathieu %A Nowicki, Sophie M. J. %A Paden, John D. %A Price, Stephen F. %A Seroussi, Helene %B Journal of Geophysical Research: Earth Surface %8 jul %G eng %U http://doi.wiley.com/10.1002/2015JF003803 %0 Journal Article %J Journal of Geophysical Research: Earth Surface %D 2015 %T Radiostratigraphy and age structure of the Greenland Ice Sheet %A MacGregor, Joseph A. %A Fahnestock, Mark A. %A Catania, Ginny A. %A Paden, John D %A Prasad Gogineni, S. %A Young, S Keith %A Rybarski, Susan C %A Mabrey, Alexandria N %A Wagman, Benjamin M %A Morlighem, Mathieu %K 10.1002/2014JF003215 and Greenland Ice Sheet %K ice core %K ice-penetrating dynamics %K ice-sheet dynamics %B Journal of Geophysical Research: Earth Surface %V 120 %P 212–241 %G eng %U http://doi.wiley.com/10.1002/2014JF003215 %R 10.1002/2014JF003215 %0 Journal Article %J Journal of Geophysical Research %D 1994 %T Mechanical and hydrologic basis for the rapid motion of a large tidewater glacier: 2. Interpretation %A Kamb, Barclay %A Engelhardt, Hermann %A Fahnestock, Mark A. %A Humphrey, Neil %A Meier, Mark %A Stone, Dan %B Journal of Geophysical Research %V 99 %P 15231 %G eng %U http://www.agu.org/pubs/crossref/1994/94JB00467.shtml http://doi.wiley.com/10.1029/94JB00467 %R 10.1029/94JB00467