1. Department of Physics; University of Toronto; Toronto Ontario Canada
2. Joint Institute for Regional Earth System Science and Engineering; University of California; Los Angeles CA USA
3. Atmospheric Science Department; Colorado State University; Fort Collins CO USA
4. Division of Geological and Planetary Sciences; California Institute of Technology; Pasadena CA USA
5. Jet Propulsion Laboratory; California Institute of Technology; Pasadena CA USA
6. NASA Goddard Space Flight Center; Greenbelt MD USA
7. Climate Research Division; Environment and Climate Change Canada; Victoria British Columbia Canada
8. Climate Research Division; Environment and Climate Change Canada; Downsview Ontario Canada
9. Now at Meteorological Research Division; Environment and Climate Change Canada; Dorval Quebec Canada
10. College of Engineering, Mathematics, and Physical Sciences; University of Exeter; Exeter UK
11. Institute of Environmental Physics; University of Bremen; Bremen Germany
12. Finnish Meteorological Institute; Sodankylä Finland