[1] Forschungszentrum Julich, Inst Energie & Klimaforsch IEK 8, D-52425 Julich, Germany
[2] NOAA ESRL Global Monitoring Div, Boulder, CO 80305 USA
[3] Norwegian Inst Air Res NILU, N-2027 Kjeller, Norway
[4] Univ Grenoble 1, CNRS, Lab Glaciol & Geophys Environm, F-38402 St Martin Dheres, France
[5] Environm Canada, Proc Res Sect, Toronto, ON M3H 5T4, Canada
[6] Paul Scherrer Inst, Lab Atmospher Chem, CH-5232 Villigen, Switzerland
[7] DLR, Deutsch Fernerkundungsdatenzentrum, D-82234 Oberpfaffenhofen, Germany
[8] Max Planck Inst Meteorol, D-20146 Hamburg, Germany
[9] Ist Metodol Anal Ambientale CNR IMAA, I-85050 Potenza, Italy
[10] Natl Inst Environm Studies, Tsukuba, Ibaraki 3058506, Japan
[11] Phys Meteorol Observ Davos PMOD WRC, CH-7260 Davos, Switzerland
[12] Leibniz Inst Tropospher Res, D-04318 Leipzig, Germany
[13] Chinese Acad Meteorol Sci, Beijing 100081, Peoples R China