1. NOAA Air Resources Laboratory, Silver Spring, MD, USA
2. Canadian Centre for Climate Modelling and Analysis, Environment Canada, University of Victoria, Victoria, BC, Canada
3. NOAA Geophysical Fluid Dynamics Laboratory, Princeton, NJ, USA
4. Department of Meteorology, University of Reading, Earley Gate, Reading, UK
5. Cooperative Institute for Climate and Satellites, Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University and NOAA's National Climatic Data Center, Asheville, NC, USA