1. Department of Geography and Planning, Department of Earth and Atmospheric Sciences; State University of New York at Albany; Albany; New York; USA
2. U.S. Geological Survey; Troy; New York; USA
3. Alfred Wegener Institute for Polar and Marine Research; Potsdam; Germany
4. Department of Geography; Moscow State University; Moscow; Russia
5. Lawrence Berkeley National Laboratory; Berkeley; California; USA
6. U.S. Geological Survey; Menlo Park; California; USA