Kristan Morgan, Johns Hopkins University, Environmental Health and Engineering, Balitmore, United States; NASA Goddard Space Flight Center, GES DISC, Greenbelt, United States, Scot Miller, Johns Hopkins University, Environmental Health and Engineering, Baltimore, United States, David Baker, Colorado State University, Fort Collins, CO, United States, Junjie Liu, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, United States, Sourish Basu, NASA/GSFC, Greenbelt, United States, Frederic Chevallier, Institut Pierre Simon Laplace, LSCE, Gif-sur-Yvette Cedex, France, Fei Jiang, Nanjing University, Nanjing, China, Zhe Jin, Peking University, Beijing, China, Matthew S Johnson, Earth Science Division, NASA Ames Research Center, Moffett Field, CA, United States, Shamil S Maksyutov, NIES, Tsukuba, Japan and Sajeev Philip, Indian Institute of Technology Delhi, Centre for Atmospheric Sciences, New Delhi, India