1. Department of Atmospheric Sciences University of Washington Seattle Washington USA
2. Department of Physics University of Helsinki Helsinki Finland
3. Department of Plant Physiology Estonian University of Life Sciences Tartu Estonia
4. Department of Forest Sciences University of Helsinki Helsinki Finland
5. Department of Soil, Water, and Climate University of Minnesota Minneapolis‐Saint Paul Minnesota USA
6. Department of Chemistry University of Washington Seattle Washington USA
7. Atmospheric Chemistry and Dynamics Lab NASA Goddard Space Flight Center Greenbelt Maryland USA
8. Joint Center for Earth Systems Technology University of Maryland Baltimore County Baltimore Maryland USA