1. NOAA/Earth System Research Laboratory, Boulder, Colorado
2. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, and NOAA/Earth System Research Laboratory, Boulder, Colorado
3. Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada
4. Finnish Meteorological Institute, Helsinki and Sodankylä, Finland, and University Centre in Svalbard, Longyearbyen, Norway
5. Arctic and Antarctic Research Institute, St. Petersburg, Russia
6. Department of Geosciences, University of Oslo, Olso, Norway, and University of California, Merced, Merced, California
7. European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom
8. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
9. Le Centre d’Applications et de Recherches en Télédétection (CARTEL), Université de Sherbrooke, Sherbrooke, Quebec, Canada, and Environment Canada, Downsview, Ontario, Canada
10. Retired (Environment Canada, Downsview, Ontario, Canada)
11. Agriculture and Agri-Food Canada, Ottawa, Ontario, Canada
12. Department of Civil and Environmental Engineering, Washington State University, Pullman, Washington
13. Finnish Meteorological Institute, Helsinki and Sodankylä, Finland
14. Retired (CIRES/Earth System Research Laboratory), Boulder, Colorado
15. Environment Canada, Downsview, Ontario, Canada
16. Department of Environmental Science, Aarhus University, Roskilde, Denmark, and Arctic Research Centre, Aarhus University, Aarhus, Denmark
17. NOAA/National Severe Storms Laboratory, Norman, Oklahoma
18. Environmental Radioactivity Laboratory, Institute of Nuclear and Radiological Science and Technology, Energy and Safety, National Centre of Scientific Research Demokritos, Athens, Greece
19. Norwegian Meteorological Institute, Oslo, Norway
20. Institute of Climate and Environmental Research, Japan Agency for Marine–Earth Science and Technology, Yokosuka, Kanagawa, Japan
21. Civil and Environmental Engineering, Duke University, Durham, North Carolina
22. Centre for Earth Observation Science, University of Manitoba, Winnipeg, Manitoba, Canada
23. North-East Scientific Station, Pacific Institute of Geography, Russian Academy of Sciences, Cherskii, Republic of Sakha, Yakutia, Russia
24. CARTEL, Université de Sherbrooke, Sherbrooke, Quebec, Canada
25. Department of Physics, University of Toronto, Toronto, Ontario, Canada
26. Science and Technology Corporation, and NOAA/Earth System Research Laboratory, Boulder, Colorado
27. Department of Meteorology, The Pennsylvania State University, University Park, Pennsylvania
28. Main Geophysical Observatory, St. Petersburg, Russia