TY - JOUR T1 - Analysis of a GRACE global mascon solution for Gulf of Alaska glaciers JF - Journal of Glaciology Y1 - 2013 A1 - Anthony A. Arendt A1 - Scott B Luthcke A1 - Alex S. Gardner A1 - Shad OʼNeel A1 - D. Hill A1 - Geir Moholdt A1 - Waleed Abdalati VL - 59 IS - 217 ER - TY - JOUR T1 - An increase in crevasse extent, West Greenland: Hydrologic implications JF - Geophysical Research Letters Y1 - 2011 A1 - Colgan, William A1 - Steffen, Konrad A1 - McLamb, W. Scott A1 - Waleed Abdalati A1 - Rajaram, Harihar A1 - Roman J. Motyka A1 - Phillips, Thomas A1 - Robert S Anderson KW - crevasses KW - Greenland KW - mass balance KW - velocity AB - We compare high-resolution 1985 and 2009 imagery to assess changes in crevasse extent in the Sermeq Avannarleq ablation zone, West Greenland. The area occupied by crevasses >2 m wide significantly increased (13 ± 4%) over the 24-year period. This increase consists of an expansion of existing crevasse fields, and is accompanied by widespread changes in crevasse orientation (up to 45°). We suggest that a combination of ice sheet thinning and steepening are responsible for the increase in crevasse extent. We examine the potential impact of this change on the hydrology of the ice sheet. We provide a first-order demonstration that moulin-type drainage is more efficient in transferring meltwater fluctuations to the subglacial system than crevasse-type drainage. As enhanced basal sliding is associated with meltwater “pulses”, an increase in crevasse extent can therefore be expected to result in a net decrease in basal sliding sensitivity. An increase in crevasse extent may also accelerate cryo-hydrologic warming and enhance surface ablation. VL - 38 UR - http://dx.doi.org/10.1029/2011GL048491 ER -