1. Department of Earth and Planetary Sciences Nanjing University Nanjing China
2. Frontiers Science Center for Critical Earth Material Cycling Nanjing University Nanjing China
3. Department of Earth Science University of California Santa Barbara CA USA
4. School of Geography and Ocean Science Nanjing University Nanjing China
5. CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing China
6. State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi’an China