Reconciling Drivers of Seasonal Terminus Advance and Retreat at 13
Journal of Geophysical Research: Earth Surface RESEARCH ARTICLE Reconciling Drivers of Seasonal Terminus Advance 10.1029/2018JF004628 and Retreat at 13 Central West Greenland Key Points: Tidewater Glaciers • We evaluate the correlation of seasonal terminus advance/retreat to M. J. Fried1,2 , G. A. Catania1,2 , L. A. Stearns3 , D. A. Sutherland4 , T. C. Bartholomaus5 , glacial runoff, ice mélange, and 6 6 ocean temperature E. Shroyer , and J. Nash • Runoff is the strongest predictor at 1 2 glaciers that calve via serac failures Institute for Geophysics, University of Texas at Austin, Austin, TX, USA, Department of Geosciences, University of Texas at where subglacial melt plumes locally Austin, Austin, TX, USA, 3Department of Geology, University of Kansas, Lawrence, KS, USA, 4Department of Earth Sciences, enhance retreat University of Oregon, Eugene, OR, USA, 5Department of Geology, University of Idaho, Moscow, ID, USA, 6College of Earth, • Glaciers with sporadic, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA buoyancy-induced full-thickness calving and the largest ice fluxes are less sensitive to environmental forcings Abstract The majority of Greenland tidewater glaciers undergo a seasonal cycle in terminus position, characterized by wintertime advance and summertime retreat. Understanding mechanisms that control seasonal cycles can help elucidate how tidewater glaciers regulate dynamic ice loss on longer timescales. Supporting Information: • Supporting Information S1 However, controls on terminus position are numerous and complex. To address this, we compare time series • Movie S1 of satellite-derived terminus positions for tidewater glaciers in central west Greenland with observations of • Movie S2 environmental forcings, including runoff at the grounding line, mélange presence, and, where available, • Movie S3 ocean temperature in the proglacial fjord.
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