1. National Aeronautics and Space Administration Goddard Space Flight Center, Greenbelt, Maryland;
2. European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom;
3. LERMA, Observatoire de Paris, CNRS, Paris, France;
4. Naval Research Laboratory, Washington, D.C.;
5. Met Office, Exeter, United Kingdom;
6. Remote Sensing Systems, Santa Rosa, California;
7. LOCEAN, Sorbonne Université, CNRS, Paris, France;
8. Royal Netherlands Meteorological Institute, De Bilt, Netherlands;
9. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California;
10. Joint Center for Satellite Data Assimilation, University Corporation for Atmospheric Research, College Park, Maryland;
11. China Meteorological Administration, Beijing, China;
12. Estellus, Paris, France