1. Department of Environmental Studies University of Colorado Boulder CO USA
2. Institute of Arctic and Alpine Research University of Colorado Boulder CO USA
3. Department of Atmospheric and Oceanic Sciences University of Colorado Boulder CO USA
4. Columbia University and Lamont‐Doherty Earth Observatory Palisades NY USA
5. Institut Pierre‐Simon Laplace Laboratoire des Sciences du Climat et de l’Environnement Gif‐sur‐Yvette France
6. Environmental Physics Institute of Biogeochemistry and Pollutant Dynamics ETH Zürich Zürich Switzerland
7. Max Planck Institute for Meteorology Hamburg Germany
8. Department of Statistics and Institute of the Environment and Sustainability University of California Los Angeles CA USA
9. National Oceanic and Atmospheric Administration Global Monitoring Laboratory and Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder CO USA