1. State Key Laboratory of Tibetan Plateau Earth System and Resources Environment, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101 China
2. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 1000449 China
3. Centre for Environmental Magnetism & Palaeomagnetism, Lancaster Environment Centre, University of Lancaster, Lancaster LA1 4YQ, UK
4. Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa 277-8564, Japan
5. School of Resource and Environmental Sciences, Linyi University, 276000 Linyi, China