1. Department of Earth and Atmospheric Sciences; University of Nebraska-Lincoln; Lincoln NE USA
2. Department of Chemical and Biochemical Engineering; University of Iowa; Iowa City IA USA
3. Center for Global and Regional Environmental Research; University of Iowa; Iowa City IA USA
4. Climate and Radiation Laboratory; NASA Goddard Space Flight Center; Greenbelt MD USA
5. Science Systems and Applications, Inc.; Lanham MD USA