1. Institute for Environmental and Climate Research Jinan University Guangzhou China
2. Chemical Science Laboratory National Oceanic and Atmospheric Administration Boulder CO USA
3. Laboratory for Atmospheric and Space Physics University of Colorado Boulder CO USA
4. Department of Atmospheric and Oceanic Sciences University of Colorado Boulder CO USA
5. Atmospheric Chemistry Observations and Modeling National Center for Atmospheric Research Boulder CO USA
6. Global Monitoring Laboratory National Oceanic and Atmospheric Administration Boulder CO USA
7. Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder CO USA