Huiying Xu, Tsinghua University, Beijing, China, Han Wang, Tsinghua University, Department of Earth System Science, Beijing, China, Iain Colin Prentice, Imperial College London, London, United Kingdom, Sandy Harrison, University of Reading, School of Archaeology, Geography and Environmental Science (SAGES), Reading, United Kingdom, Wang Genxu, IMHE Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China and Xiangyang Sun, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China