1. Norwegian Polar Institute Fram Centre Tromsø N-9296 Norway
2. Department of Geosciences University of Oslo
P.O. Box 1047
Oslo Blindern 0316 Norway
3. Department of Applied Environmental Science Stockholm University
Svante Arrhenius väg 8
Stockholm SE-11418 Sweden
4. Atmospheric, Oceanic and Planetary Physics, Department of Physics University of Oxford
Parks Road
Oxford OX1 3PU UK
5. LPC2E, UMR 7328, CNRS-Université d'Orléans 3A Avenue de la Recherche Scientifique
Orléans
45071 Cedex 2 France
6. NILU – Norwegian Institute for Air Research Instituttv 18, N-2027 Kjeller Norway
7. National Research Council Institute of Atmospheric Sciences and Climate (ISAC-CNR)
Via Gobetti 101
Bologna 40129 Italy
8. National Research Council Institute of Atmospheric Sciences and Climate (ISAC-CNR)
Via del Fosso del Cavaliere 100
Rome 00133 Italy
9. Department of Geography University of Sheffield
Sheffield
S10 2TN UK