TY - JOUR T1 - Variable penetration depth of interferometric synthetic aperture radar signals on Alaska glaciers: a cold surface layer hypothesis JF - Annals of Glaciology Y1 - 2013 A1 - Alessio Gusmeroli A1 - Anthony A. Arendt A1 - D K Atwood A1 - B. Kampes A1 - M. Sanford A1 - J. Young VL - 54 IS - 64 ER -