1. College of Atmospheric Sciences, Lanzhou University, Lanzhou730000, P. R. China
2. Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, Lanzhou University, Lanzhou730000, P. R. China
3. Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing100871, P. R. China
4. National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing100021, P. R. China
5. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing210000, P. R. China
6. Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou730000, P. R. China
7. Ministry of Education Key Laboratory for Earth System Modeling & Department of Earth System Science, Tsinghua University, Beijing100084, P. R. China