Kevin M Schaefer¹, Richard H Chen², Roger J Michaelides³, Mahta Moghaddam⁴, Andy Parsekian⁵, Taylor D Sullivan⁵ and Howard A Zebker⁶, (1)National Snow and Ice Data Center, Cooperative Institute for Research in the Environmental Sciences, University of Colorado at Boulder, Boulder, Colorado, U.S.A, Boulder, CO, United States, (2)University of Southern California, Los Angeles, CA, United States, (3)Stanford University, Geophysics, Stanford, CA, United States, (4)University of Southern California, Electrical Engineering, Los Angeles, CA, United States, (5)University of Wyoming, Laramie, WY, United States, (6)Stanford Univ, Stanford, CA, United States