1. Xi’an Key Laboratory of Solid Waste Recycling and Resource Recovery, Department of Environmental Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710049, China
3. Divison of Atmospheric Sciences, Desert Research Institute, Reno NV89512, United States