Zachary Katz¹, Matthew Siegfried¹, Susan L. Howard², Laurence Padman³, Tyler C Sutterley⁴ and Tasha Snow^5,6, (1)Colorado School of Mines, Department of Geophysics, Golden, United States, (2)Earth and Space Research, Seattle, United States, (3)Earth & Space Research, Corvallis, United States, (4)Applied Physics Laboratory University of Washington, Polar Science Center, Seattle, United States, (5)NASA Goddard Space Flight Center, Cryospheric Sciences Laboratory, Greenbelt, United States, (6)University of Maryland College Park, Earth System Science Interdisciplinary Center, College Park, MD, United States