1. K. C. Taylor, Desert Research Institute, University and Community College System of Nevada, Reno, NV 89506, USA.
2. P. A. Mayewski, M. S. Twickler, S. Whitlow, G. A. Zielinski, Climate Change Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH 03824, USA.
3. R. B. Alley, Earth System Science Center, The Pennsylvania State University, University Park, PA 16802, USA.
4. E. J. Brook, Departments of Geology and Environmental Science, Washington State University, Vancouver, WA 98686, USA.
5. A. J. Gow and D. A. Meese, U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, NH 03755, USA.