Jianhui Chen¹, Jianbao Liu^2,3, Xiaojian Zhang⁴, Shengqian Chen⁵, Wei Huang², Jie Chen², Shengrui Zhang⁶, Aifeng Zhou² and Fahu Chen^1,3, (1)Lanzhou University, MOE Key Laboratory of West China's Environmental System, College of Earth and Environmental Sciences, Lanzhou, China, (2)Lanzhou University, Key Laboratory of Western China’s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou, China, (3)Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China, (4)Nanjing University, School of Geographic and Oceanographic Sciences, Nanjing, China, (5)Lanzhou University, Lanzhou, China, (6)Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China