1. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
2. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Boulder, Colorado 80309, United States
3. Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado 80305, United States
4. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
5. Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China
6. Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich GmbH, Jülich 52425, Germany