1. 1Department of Geology & Geophysics, University of Wyoming, Laramie, Wyoming 82073, USA
2. 2Department of Earth & Environmental Sciences, Lehigh University, Bethlehem, Pennsylvania 18015, USA
3. 3Department of Geography & Environment, University of Hawai'i at Mānoa, Honolulu, Hawaii 96822, USA
4. 4Key Laboratory of Geographical Processes & Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun, Jilin 130024, China
5. 5Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography & Agroecology, Chinese Academy of Sciences, Changchun, Jilin 130102, China