Tyler C Sutterley, Applied Physics Laboratory University of Washington, Seattle, WA, United States, Ben Smith, University of Washington, Applied Physics Laboratory, Seattle, WA, United States, Michiel R van den Broeke, Utrecht University, Institute for Marine and Atmospheric Research Utrecht, Utrecht, Netherlands, Brice Noel, Institute for Marine and Atmospheric Research Utrecht, Utrecht, Netherlands, Marco Tedesco, Columbia University, Palisades, NY, United States, Patrick M Alexander, CUNY Graduate School and University Center, New York, NY, United States and Xavier Fettweis, University of Liège, Liège, Belgium