[1] Natl Ctr Atmospher Res, Res Applicat Lab, Boulder, CO 80307 USA
[2] US Geol Survey, Chicago, IL USA
[3] US Geol Survey, Lincoln, NE USA
[4] US Geol Survey, Moffett Field, CA USA
[5] Hong Kong Univ Sci & Technol, Div Environm & Sustainabil, Hong Kong, Peoples R China