1. Climate Change Institute and School of Earth and Climate SciencesUniversity of Maine Orono Maine USA
2. Department of GeographyUniversity of Idaho Moscow Idaho USA
3. State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences Lanzhou China
4. CAS Center for Excellence in Tibetan Plateau Earth SciencesChinese Academy of Sciences Beijing China