1. School of Geography and Tourism Shaanxi Normal University Xi'an China
2. State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an China
3. Department of Atmospheric and Oceanic Sciences Peking University Beijing China
4. State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing China
5. Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection School of Resource and Environmental Sciences Linyi University Linyi China