1. Earth, Atmospheric, and Planetary Sciences MIT Cambridge MA USA
2. Atmospheric Chemistry Observations and Modeling Laboratory National Center for Atmospheric Research Boulder CO USA
3. Climate Science Centre, Oceans and Atmosphere Commonwealth Scientific and Industrial Research Organization (CSIRO) Aspendale VIC Australia
4. Scripps Institution of Oceanography University of California San Diego La Jolla CA USA
5. School of Chemistry University of Bristol Bristol UK
6. Center for Global Change Science Massachusetts Institute of Technology Cambridge MA USA