Dept. of Physics and Atmospheric Science, Dalhousie University, Canada

Dept. of Physics and Atmospheric Science, Dalhousie University, Canada

Harvard-Smithsonian Center for Astrophysics, USA

Science and Technology Branch, Environment Canada, Canada

Science and Technology Branch, Environment Canada, Canada

Dept. of Physics and Atmospheric Science, Dalhousie University, Canada

Dept. of Physics, University of Toronto, Canada

Decision and Information Sciences Division, Argonne National Laboratory, USA

Decision and Information Sciences Division, Argonne National Laboratory, USA

Department of Chemistry and Biochemistry, and Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado, USA

Department of Chemistry and Biochemistry, and Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado, USA

Climate Change Research Center/EOS, University of New Hampshire, USA

School of Earth and Atmospheric Sciences, Georgia Institute of Technology, USA

School of Earth and Atmospheric Sciences, Georgia Institute of Technology, USA

Biogeochemistry Department, Max Planck Institute for Chemistry, Germany