TY - JOUR T1 - Flow velocities of Alaskan glaciers JF - Nat Commun Y1 - 2013 A1 - Evan W. Burgess A1 - Richard R. Forster A1 - Chris F. Larsen VL - 4 UR - http://dx.doi.org/10.1038/ncomms3146 ER - TY - JOUR T1 - The propagation of a surge front on Bering Glacier, Alaska, 2001–2011 JF - Annals of Glaciology Y1 - 2013 A1 - Turrin, James A1 - Richard R. Forster A1 - Chris F. Larsen A1 - Sauber, Jeanne AB - 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. VL - 54 UR - http://www.ingentaconnect.com/content/igsoc/agl/2013/00000054/00000063/art00024 ER - TY - JOUR T1 - Southeast Greenland high accumulation rates derived from firn cores and ground-penetrating radar JF - Annals of Glaciology Y1 - 2013 A1 - Miège, C. A1 - Richard R. Forster A1 - Box, J.E. A1 - Evan W. Burgess A1 - McConnell, J.R. A1 - Pasteris, D.R. A1 - Spikes, V.B. VL - 54 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84881651457&partnerID=40&md5=6aa824682a2fef9009d445649f72c298 ER - TY - JOUR T1 - Summer melt regulates winter glacier flow speeds throughout Alaska JF - Geophysical Research Letters Y1 - 2013 A1 - Evan W. Burgess A1 - Chris F. Larsen A1 - Richard R. Forster KW - Alaska KW - Ice Dynamics KW - Mountain Glaciers KW - Offset Tracking KW - Sub-Glacial Hydrology KW - Winter AB - 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. UR - http://dx.doi.org/10.1002/2013GL058228 ER - TY - JOUR T1 - Plate margin deformation and active tectonics along the northern edge of the Yakutat Terrane in the Saint Elias Orogen, Alaska, and Yukon, Canada JF - Geosphere Y1 - 2012 A1 - Bruhn, R.L. A1 - Sauber, J. A1 - Cotton, M.M. A1 - Pavlis, T.L. A1 - Evan W. Burgess A1 - Ruppert, N. A1 - Richard R. Forster VL - 8 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84873486244&partnerID=40&md5=6b0147233ff3aeb0e48bf9b253b6c6ec ER - TY - JOUR T1 - Surge dynamics on Bering Glacier, Alaska, in 2008–2011 JF - The Cryosphere Discuss Y1 - 2012 A1 - Evan W. Burgess A1 - Richard R. Forster A1 - Chris F. Larsen A1 - M Braun VL - 6 ER - TY - JOUR T1 - A spatially calibrated model of annual accumulation rate on the Greenland Ice Sheet (1958-2007) JF - Journal of Geophysical Research F: Earth Surface Y1 - 2010 A1 - Evan W. Burgess A1 - Richard R. Forster A1 - Box, J.E. A1 - Mosley-Thompson, E. A1 - Bromwich, D.H. A1 - Bales, R.C. A1 - Smith, L.C. VL - 115 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-77951082793&partnerID=40&md5=a6430b7a7a93a85254e4f44589f3b0f4 ER -