[1]Key Laboratory of West China's Environmental System (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;
[1]Key Laboratory of West China's Environmental System (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;
[1]Key Laboratory of West China's Environmental System (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;
[2]Department of Biology and Bjerknes Centre for Climate Research, University of Bergen, N-5020 Bergen, Norway;
[2]Department of Biology and Bjerknes Centre for Climate Research, University of Bergen, N-5020 Bergen, Norway;
[3]Institute of Nihewan Archaeology Research, Hebei Normal University, Shijiazhuang 050024, China;
[3]Institute of Nihewan Archaeology Research, Hebei Normal University, Shijiazhuang 050024, China;
[4]Institute of Geographic Science and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
[5]University of Chinese Academy of Sciences, Beijing 100049, China;
[1]Key Laboratory of West China's Environmental System (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;
[1]Key Laboratory of West China's Environmental System (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;
[1]Key Laboratory of West China's Environmental System (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;
[1]Key Laboratory of West China's Environmental System (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;
[1]Key Laboratory of West China's Environmental System (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;