[1] Univ Versailles St Quentin En Yvelines, CNRS, Observ Versailles St Quentin En Yvelines, F-78280 Guyancourt, France
[2] Univ Colorado, CIRES, Boulder, CO 80309 USA
[3] NERC Ctr Ecol & Hydrol, Edinburgh EH26 0QB, Midlothian, Scotland
[4] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[5] Deutsch Wetterdienst, Hohenpeissenberg Meteorol Observ, D-82383 Hohenpeissenberg, Germany
[6] Alfred Wegener Inst, D-14401 Potsdam, Germany
[7] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[8] NASA Headquarters, Earth Sci Div, Washington, DC USA
[9] Chinese Acad Meteorol Sci, Beijing 100081, Peoples R China
[10] Bur Meteorol, Melbourne, Vic 3001, Australia
[11] Univ Edinburgh, Sch Geosci, Edinburgh EH9 3FE, Midlothian, Scotland
[12] Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ, England
[13] Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England
[14] Univ Bremen, Inst Environm Phys, D-28359 Bremen, Germany
[15] Finnish Meteorol Inst, Earth Observat, FI-00101 Helsinki, Finland
[16] NERC Ctr Ecol & Hydrol, Bangor LL57 2UW, Gwynedd, Wales
[17] Aristotle Univ Thessaloniki, ELKE AUTH, Thessaloniki, Greece
[18] Publ Hlth England, Ctr Radiat Chem & Environm Hazards, London, England
[19] Acad Athens, Res Ctr Atmospher Phys & Climatol, Athens 10680, Greece
[20] Univ Exeter, Med Sch, Truro TR1 3HD, England