1. Met Office Hadley Centre, FitzRoy Road, Exeter, UK
2. Cooperative Institute for Climate and Satellites, NOAA National Climatic Data Center, 151 Patton Avenue, Asheville, NC, USA
3. NOAA Geophysical Fluid Dynamics Laboratory, Forrestal Campus, US Route 1, PO Box 308, Princeton, NJ, USA
4. NOAA National Climatic Data Center, 151 Patton Avenue, Asheville, NC, USA
5. NOAA Air Resources Laboratory, 1315 East West Highway, Silver Spring, MD, USA
6. Department of Meteorology, University of Reading, Earley Gate, PO Box 243, Reading, UK