College of Geography and Environmental Science Northwest Normal University Lanzhou 730070 China;
College of Geography and Environmental Science Northwest Normal University Lanzhou 730070 China;
College of Geography and Environmental Science Northwest Normal University Lanzhou 730070 China;
State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou 730000 China;
Tian Shan Glaciological Station Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou 730000 China;
College of Geography and Environmental Science Northwest Normal University Lanzhou 730070 China;
College of Geography and Environmental Science Northwest Normal University Lanzhou 730070 China;