1. Air Quality Processes Research Section, Environment and Climate Change Canada, 4905 Dufferin Street, Toronto, Ontario M5P 1W4, Canada
2. Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK
3. Department of Chemistry, Umeå University, Umeå, SE-901 87, Sweden
4. Institute of Environmental Assessment and Water Research, Spanish National Research Council (IDAEA-CSIC), Barcelona, Catalonia 08034, Spain
5. Aquatic Contaminants Research Division, Environment and Climate Change Canada, Burlington, Ontario L7S 1A1, Canada
6. Hermanson & Associates LLC, 2000 W 53rd Street, Minneapolis, Minnesota 55419, USA
7. Department of Arctic Technology, University Centre in Svalbard (UNIS), Longyearbyen, 9171, Norway
8. Faculty of Chemistry, Biotechnology and Food Sciences, Norwegian University of Life Sciences (NMBU), Ås, 1432, Norway
9. Department for Environmental Science, Stockholm University, 114 19 Stockholm, Sweden
10. Department of Chemistry and Biology, Ryerson University, Toronto, Ontario M5B 2K3, Canada
11. Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
12. Arctic Monitoring and Assessment Programme Secretariat, The Fram Centre, 9296 Tromsø, Norway