1. Service d’Aéronomie, CNRS-UPMC-UVSQ, Paris, France;
2. Laboratoire des Sciences du Climat et de l’Environnement, CEA-CNRS, Gif-sur-Yvette, France;
3. Pacific Marine Environment L aboratories, NOAA, Seattle, WA, USA;
4. Scripps Institution of Oceanography, La Jolla, CA, USA;
5. SRI International, Menlo Park, CA, USA