1. NILU − Norwegian Institute for Air Research, The Fram Centre, P.O. Box 6606 Langnes, 9296 Tromsø, Norway
2. Department
of Geography, University of Leicester, Leicester LE1 7RH, United Kingdom
3. Akvaplan-niva AS, The Fram Centre, P.O. Box 6606 Langnes, 9296 Tromsø, Norway
4. NILU − Norwegian Institute for Air Research, P.O. Box 100, 2027 Kjeller, Norway
5. Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway