Albert Kettner, University of Colorado at Boulder, CSDMS/INSTAAR, Boulder, CO, United States, Irina Overeem, University of Colorado, Institute of Arctic and Alpine Research, Boulder, CO, United States, Gregory E Tucker, Univ Colorado, Boulder, CO, United States, Eric Hutton, Community Surface Dynamics Modeling System, Boulder, CO, United States, Mark Piper, University of Colorado at Boulder, Boulder, CO, United States and Leslie Hsu, Lamont-Doherty Earth Obs, Palisades, NY, United States