[1] IPSL, Lab Atmospheres Milieux Observat Spatiales LATMOS, F-78140 Velizy Villacoublay, France
[2] European Space Agcy ESA ESRIN, Directorate Earth Observat Programmes, I-00044 Frascati, Italy
[3] CNR, IMAA, I-85050 Tito, PZ, Italy
[4] Rensselaer Polytech Inst, Troy, NY 12180 USA
[5] Fraunhofer Inst Algorithms & Sci Comp SCAI, D-53754 St Augustin, Germany
[6] KNMI, NL-3730 AE De Bilt, Netherlands