1. College of Global Change and Earth System Science; Beijing Normal University; Beijing China
2. ESSIC and Department of Atmospheric and Oceanic Sciences, Cooperative Institute for Climate Studies; University of Maryland; College Park Maryland USA
3. Department of Atmospheric Science; University of Wyoming; Laramie Wyoming USA
4. Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics; Chinese Academy of Sciences; Hefei China