John W Robbins, NASA Goddard Space Flight Center, Code 615 - Cryospheric Lab, Greenbelt, MD, United States, Richard Ray, NASA Goddard Space Flight Center, code 61A, Greenbelt, United States, Tom Neumann, NASA Goddard Space Flight Ctr., Greenbelt, MD, United States and James Morison, Polar Science Ctr, Seattle, WA, United States