1. Earth, Atmospheric, and Planetary Sciences; Purdue University; West Lafayette Indiana 47907 USA
2. Institute of Arctic Biology; University of Alaska Fairbanks; Fairbanks Alaska 99775 USA
3. U.S. Geological Survey; Alaska Cooperative Fish and Wildlife Research Unit; University of Alaska Fairbanks; Fairbanks Alaska 99775 USA
4. Scenarios Network for Alaska and Arctic Planning; International Arctic Research Center; University of Alaska Fairbanks; Fairbanks Alaska 99775 USA
5. U.S. Department of Agriculture, Forest Service; Northern Research Station; Newtown Square Pennsylvania 19073 USA
6. Department of Forest Resources; University of Minnesota; St. Paul Minnesota 55108 USA
7. Stinger Ghaffarian Technologies Inc., contractor to the U.S. Geological Survey; Sioux Falls South Dakota 57198 USA
8. U.S. Geological Survey; The Earth Resources Observation Systems Center; Sioux Falls South Dakota 57198 USA
9. U.S. Geological Survey; Reston Virginia 12201 USA