1. State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering; Peking University; Beijing China
2. Institute for Environmental and Climate Research; Jinan University; Guangzhou China
3. Laboratoire d'Aérologie, University of Toulouse, CNRS, UPS; Toulouse France
4. Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder USA
5. Cooperative Institute for Research in Environmental Sciences; University of Colorado Boulder; Boulder CO USA