1. Finnish Meteorological Institute, Helsinki, Finland
2. Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, Colorado
3. Meteorological Institute, University of Bonn, Bonn, Germany
4. Deutscher Wetterdienst, Offenbach, Germany
5. NOAA/National Centers for Environmental Information, Asheville, North Carolina
6. Météo-France, Toulouse, France
7. Institute of Environmental Sciences and Geography, University of Potsdam, Germany
8. GCOS Secretariat, WMO, Geneva, Switzerland