1. Key Laboratory for Atmospheric Chemistry, Centre for Atmosphere Watch and Services; Chinese Academy of Meteorological Sciences, China Meteorological Administration; Beijing China
2. Climate Monitoring and Diagnostics Laboratory; NOAA; Boulder Colorado USA
3. Institute for Arctic and Alpine Research; University of Colorado; Boulder Colorado USA
4. Center for Global Environmental Research; National Institute for Environmental Studies; Tsukuba Japan
5. School for Environmental Sciences; Peking University; Beijing China