1. Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland
2. Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, and Earth System Science Interdisciplinary Center, University of Maryland, College Park, College Park, Maryland
3. Byrd Polar and Climate Research Center, The Ohio State University, Columbus, Ohio
4. Earth System Science Interdisciplinary Center, University of Maryland, College Park, College Park, and Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, Maryland