%0 Journal Article %J Nat Commun %D 2013 %T Flow velocities of Alaskan glaciers %A Evan W. Burgess %A Richard R. Forster %A Chris F. Larsen %B Nat Commun %V 4 %G eng %U http://dx.doi.org/10.1038/ncomms3146 %R 10.1038/ncomms3146 %0 Journal Article %J Annals of Glaciology %D 2013 %T The propagation of a surge front on Bering Glacier, Alaska, 2001–2011 %A Turrin, James %A Richard R. Forster %A Chris F. Larsen %A Sauber, Jeanne %X Bering Glacier, Alaska, USA, has a ∼20 year surge cycle, with its most recent surge reaching the terminus in 2011. To study this most recent activity a time series of ice velocity maps was produced by applying optical feature-tracking methods to Landsat-7 ETM+ imagery spanning 2001–11. The velocity maps show a yearly increase in ice surface velocity associated with the down-glacier movement of a surge front. In 2008/09 the maximum ice surface velocity was 1.5 ± 0.017 km a–1 in the mid-ablation zone, which decreased to 1.2 ± 0.015 km a–1 in 2009/10 in the lower ablation zone, and then increased to nearly 4.4 ± 0.03 km a–1 in summer 2011 when the surge front reached the glacier terminus. The surge front propagated down-glacier as a kinematic wave at an average rate of 4.4 ± 2.0 km a–1 between September 2002 and April 2009, then accelerated to 13.9 ± 2.0 km a–1 as it entered the piedmont lobe between April 2009 and September 2010. The wave seems to have initiated near the confluence of Bering Glacier and Bagley Ice Valley as early as 2001, and the surge was triggered in 2008 further down-glacier in the mid-ablation zone after the wave passed an ice reservoir area. %B Annals of Glaciology %V 54 %P 221-228 %G eng %U http://www.ingentaconnect.com/content/igsoc/agl/2013/00000054/00000063/art00024 %R doi:10.3189/2013AoG63A341 %0 Journal Article %J Annals of Glaciology %D 2013 %T Southeast Greenland high accumulation rates derived from firn cores and ground-penetrating radar %A Miège, C. %A Richard R. Forster %A Box, J.E. %A Evan W. Burgess %A McConnell, J.R. %A Pasteris, D.R. %A Spikes, V.B. %B Annals of Glaciology %V 54 %P 322-332 %G eng %U http://www.scopus.com/inward/record.url?eid=2-s2.0-84881651457&partnerID=40&md5=6aa824682a2fef9009d445649f72c298 %0 Journal Article %J Geophysical Research Letters %D 2013 %T Summer melt regulates winter glacier flow speeds throughout Alaska %A Evan W. Burgess %A Chris F. Larsen %A Richard R. Forster %K Alaska %K Ice Dynamics %K Mountain Glaciers %K Offset Tracking %K Sub-Glacial Hydrology %K Winter %X Predicting how climate change will affect glacier and ice sheet flow speeds remains a large hurdle towards accurate sea level rise forecasting. Increases in surface melt rates are known to accelerate glacier flow in summer, whereas in winter, flow speeds are believed to be relatively invariant. Here we show that wintertime flow speeds on nearly all major glaciers throughout Alaska are not only variable but are inversely related to melt from preceding summers. For each additional meter of summertime melt, we observe an 11% decrease in wintertime velocity on glaciers of all sizes, geometries, climates and bed types. This dynamic occurs because inter-annual differences in summertime melt affect how much water is retained in the sub-glacial system during winter. The ubiquity of the dynamic indicates it occurs globally on glaciers and ice sheets not frozen to their beds and thus constitutes a new mechanism affecting sea level rise projections. %B Geophysical Research Letters %G eng %U http://dx.doi.org/10.1002/2013GL058228 %R 10.1002/2013GL058228 %0 Journal Article %J Geosphere %D 2012 %T Plate margin deformation and active tectonics along the northern edge of the Yakutat Terrane in the Saint Elias Orogen, Alaska, and Yukon, Canada %A Bruhn, R.L. %A Sauber, J. %A Cotton, M.M. %A Pavlis, T.L. %A Evan W. Burgess %A Ruppert, N. %A Richard R. Forster %B Geosphere %V 8 %P 1384-1407 %G eng %U http://www.scopus.com/inward/record.url?eid=2-s2.0-84873486244&partnerID=40&md5=6b0147233ff3aeb0e48bf9b253b6c6ec %0 Journal Article %J The Cryosphere Discuss %D 2012 %T Surge dynamics on Bering Glacier, Alaska, in 2008–2011 %A Evan W. Burgess %A Richard R. Forster %A Chris F. Larsen %A M Braun %B The Cryosphere Discuss %V 6 %P 1181–1204 %G eng %R 10.5194/tc-6-1251-2012 %0 Journal Article %J Journal of Geophysical Research F: Earth Surface %D 2010 %T A spatially calibrated model of annual accumulation rate on the Greenland Ice Sheet (1958-2007) %A Evan W. Burgess %A Richard R. Forster %A Box, J.E. %A Mosley-Thompson, E. %A Bromwich, D.H. %A Bales, R.C. %A Smith, L.C. %B Journal of Geophysical Research F: Earth Surface %V 115 %G eng %U http://www.scopus.com/inward/record.url?eid=2-s2.0-77951082793&partnerID=40&md5=a6430b7a7a93a85254e4f44589f3b0f4