1. Lamont-Doherty Earth Observatory, Columbia University, Palisades, and NASA Goddard Institute for Space Studies, New York, New York, and Department of Geography, Dartmouth College, Hanover, New Hampshire
2. Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York
3. NASA Goddard Institute for Space Studies, New York, and Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York