1State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
2Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China
3CAS Center for Excellence in Quaternary Science and Global Change, Xi'an 710061, China
4Division of Atmospheric Sciences, Desert Research Institute, Reno, NV 89512, United States
5Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
6Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, Kumamoto 862-8502, Japan