@article {Roth2018, title = {{Modeling Winter Precipitation Over the Juneau Icefield, Alaska, Using a Linear Model of Orographic Precipitation}}, journal = {Frontiers in Earth Science}, volume = {6}, number = {March}, year = {2018}, month = {mar}, pages = {1{\textendash}19}, keywords = {Alaska, downscaling, glacier mass balance, Juneau Icefield, Modeling, orographic precipitation, snow accumulation}, issn = {2296-6463}, doi = {10.3389/feart.2018.00020}, url = {http://journal.frontiersin.org/article/10.3389/feart.2018.00020/full}, author = {Roth, Aurora and Hock, Regine and Schuler, Thomas V. and Bieniek, Peter A. and Pelto, Mauri and Aschwanden, Andy} } @article {166, title = {Active tectonics of the St. Elias orogen, Alaska, observed with GPS measurements}, journal = {Journal of Geophysical Research: Solid Earth}, year = {2013}, pages = {n/a{\textendash}n/a}, abstract = {We use data from campaign and continuous GPS sites in southeast and south central Alaska to constrain a regional tectonic block model for the St. Elias orogen. Active tectonic deformation in the orogen is dominated by the effects of the collision of the Yakutat block with southern Alaska. Our results indicate that ~37 mm/yr of convergence is accommodated along a relatively narrow belt of N-NW dipping thrust faults in the eastern half of the orogen, with the present-day deformation front running through Icy Bay and beneath the Malaspina Glacier. Near the Bering Glacier, the collisional thrust fault regime transitions into a broad, northwest dipping d{\'e}collement as the Yakutat block basement begins to subduct beneath the counterclockwise rotating Elias block. The location of this transition aligns with the Gulf of Alaska shear zone, implying that the Pacific plate is fragmenting in response to the Yakutat collision. Our model indicates that the Bering Glacier region is undergoing internal deformation and could correspond to the final stage of offscraping and accretion of sediments from the Yakutat block prior to subduction. Predicted block motions at the western edge of the orogen suggest that the crust is laterally escaping along the Aleutian fore arc.}, keywords = {Alaska, geodesy, St. Elias orogen, tectonics, Yakutat block}, issn = {2169-9356}, doi = {10.1002/jgrb.50341}, url = {http://dx.doi.org/10.1002/jgrb.50341}, author = {Elliott, Julie and Jeffrey T. Freymueller and Chris F. Larsen} } @article {167, title = {Low-frequency radar sounding of temperate ice masses in Southern Alaska}, journal = {Geophysical Research Letters}, year = {2013}, pages = {n/a{\textendash}n/a}, abstract = {We present the Warm Ice Sounding Explorer (WISE), a low-frequency (2.5 MHz) radar for the sounding of temperate ice. WISE deployment in southern Alaska in 2008 and 2012 provides comprehensive measurements of glacier thickness, reveals deep valleys beneath glaciers and the full extent of zones grounded below sea level. The east branch of Columbia Glacier is deeper that its main branch and remains below sea level 20 km farther inland. Ice is 1000 m deep on Tazlina Glacier. On Bering glacier, two sills separate three deep bed depressions (>1200 m) that coincide with the dynamic balance lines during surges. The piedmont lobe of Malaspina Glacier and the lower reaches of Hubbard Glacier are entirely grounded below sea level 40 and 10 km, respectively, from their termini. Knowledge of ice thickness in these regions helps better understand their glacier dynamics, mass balance, and impact on sea level.}, keywords = {Alaska, bed topography, glaciology, mass balance, radar, thickness}, issn = {1944-8007}, doi = {10.1002/2013GL057452}, url = {http://dx.doi.org/10.1002/2013GL057452}, author = {Eric Rignot and Mouginot, J. and Chris F. Larsen and Gim, Y. and Kirchner, D.} } @article {204, title = {Summer melt regulates winter glacier flow speeds throughout Alaska}, journal = {Geophysical Research Letters}, year = {2013}, abstract = {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.}, keywords = {Alaska, Ice Dynamics, Mountain Glaciers, Offset Tracking, Sub-Glacial Hydrology, Winter}, issn = {1944-8007}, doi = {10.1002/2013GL058228}, url = {http://dx.doi.org/10.1002/2013GL058228}, author = {Evan W. Burgess and Chris F. Larsen and Richard R. Forster} }