1. Institute of Geography, University of Bern, Hallerstrasse 12, CH‐3012 Bern, Switzerland,
2. School of Geography and Geology, McMaster University, Hamilton, ON L8S 4K1, Canada,
3. Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523‐1371, USA,
4. Department of Integrative Biology, University of California, Berkeley, CA 94720‐3140, USA,
5. NOAA/ERL/ATDD, PO Box 2456, Oak Ridge, TN 37831, USA,
6. National Center for Atmospheric Research, Boulder, CO 80307‐3000, USA,
7. Institute of Forestry, Russian Academy of Sciences, Krasnoyarsk 660036, Russia
8. Institute of Arctic Biology, University of Alaska, Fairbanks, AK 99775‐7000, USA,