1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment Chinese Academy of Sciences Xi'an China
2. University of Chinese Academy of Sciences Beijing China
3. CAS Center for Excellence in Quaternary Science and Global Change Xi'an China
4. Institute of Global Environmental Change Xi'an Jiaotong University Xi'an China
5. Department of Geological Sciences, Center for Water Research University of Texas at San Antonio San Antonio TX USA
6. Department of Geological Sciences University of Texas at San Antonio San Antonio TX USA
7. Department of Earth System Science University of California, Irvine Irvine CA USA