1. Key Laboratory of Aerosol Chemistry and Physics State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an China
2. Chinese Academy of Sciences Center for Excellence in Quaternary Science and Global Change Xi'an China
3. University of Chinese Academy of Sciences Beijing China
4. School of Human Settlements and Civil Engineering Xi'an Jiaotong University Xi'an China
5. Laboratory of Atmospheric Chemistry Paul Scherrer Institute (PSI) Villigen Switzerland
6. Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China