1. Glacier Research Group, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH 03824, USA.
2. Department of Statistics, North Carolina State University, Raleigh, NC 27695-8203, USA.
3. Lamont-Doherty Earth Observatory, Palisades, NY 10964, USA.
4. Earth System Science Center and Department of Geosciences, Pennsylvania State University, University Park, PA 16802, USA.
5. Cold Regions Research and Engineering Laboratory, Hanover, NH 03755, USA.
6. Quaternary Isotope Laboratory, University of Washington, Seattle, WA 98195, USA.
7. Department of Physics, University of Buffalo, Amherst, NY 14260, USA.
8. Desert Research Institute, University of Nevada System, Reno, NV 89506, USA.
9. Polar Ice Coring Office, University of Alaska, Fairbanks, AK 99775, USA.