Tom Neumann, NASA Goddard Space Flight Center, Greenbelt, MD, United States, Kelly M Brunt, University of Maryland College Park, College Park, MD, United States; NASA Goddard Space Flight Ctr, Greenbelt, MD, United States, Benjamin Eaton Smith, University of Washington, Seattle, WA, United States and Tyler C Sutterley, University of California Irvine, Irvine, CA, United States