1. Byrd Polar and Climate Research Center, The Ohio State University, Columbus, OH, USA
2. Department of Geography and Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA, USA
3. Institute of Applied Physics “Nello Carrara” of the National Research Council, Sesto Fiorentino, Italy
4. ElectroScience Laboratory, The Ohio State University, Columbus, OH, USA
5. Earth Observations, Cooperative Institute for Research in Environmental Sciences, Boulder, CO, USA
6. Department of Electrical and Computer Engineering, Brigham Young University, Provo, UT, USA