1. Department of Atmospheric Science University of Alabama in Huntsville Huntsville AL USA
2. Department of Environmental Science and Engineering Fudan University Shanghai China
3. School of Earth and Environment University of Leeds Leeds UK
4. Department of Atmospheric Science, School of Environmental Studies China University of Geosciences Wuhan China
5. Institute for Atmospheric and Earth System Research/Physics, Faculty of Science University of Helsinki Helsinki Finland
6. Finnish Meteorological Institute Helsinki Finland
7. Department of Chemistry Texas A&M University College Station TX USA
8. Department of Atmospheric Sciences Texas A&M University College Station TX USA