1. Institute of Northern Engineering, University of Alaska Fairbanks, PO Box 755910, Fairbanks, AK 99775, USA.
2. Institute of Arctic Biology, University of Alaska Fairbanks, PO Box 757000, Fairbanks, AK 99775, USA.
3. Alaska Ecoscience, Fairbanks, Alaska, AK 99709, USA.
4. VITO, Boeretang 200, BE-2400 MOL, Belgium.
5. Department of Soil Science, Lomonosov Moscow State University, Moscow 119991, Russia.
6. International Arctic Research Center, University of Alaska Fairbanks, AK 99775, USA.
7. Alaska Department of Natural Resources, Geological and Geophysical Surveys, Fairbanks, AK 99709, USA.
8. Woodwell Climate Research Center, Falmouth, MA 02540, USA.
9. Geophysical Institute, University of Alaska Fairbanks, AK 99775, USA.