1. Department of Earth System Science Stanford University Stanford CA 94305 USA
2. Woods Institute for the Environment Stanford University Stanford CA 94305 USA
3. Global Monitoring Division Earth System Research Laboratory National Oceanic and Atmospheric Administration 325 Broadway Boulder CO 80305 USA
4. Cooperative Institute for Research in Environmental Sciences (CIRES) University of Colorado Boulder CO 80309 USA
5. Instituto de Pesquisas Energéticas e Nucleares (IPEN)‐Comissao Nacional de Energia Nuclear (CNEN)‐Atmospheric Chemistry Laboratory 2242 Avenida Professor Lineu Prestes Cidade Universitaria Sao Paulo CEP 05508‐000 Brazil
6. School of Geography University of Leeds Woodhouse Lane Leeds LS9 2JT UK
7. Department of Global Ecology Carnegie Institution for Science Stanford CA 94305 USA
8. Department of Meteorology and Air Quality Wageningen University PO Box 47 6700AA Wageningen The Netherlands
9. National Aeronautics and Space Administration Goddard Space Flight Center Greenbelt MD 20771 USA
10. Institute for Marine and Atmospheric Research Utrecht Utrecht University Princetonplein 5 3584 CC Utrecht The Netherlands
11. SRON Netherlands Institute for Space Research Sorbonnelaan 2 3584 CA Utrecht The Netherlands
12. University of Groningen Centre for Isotope Research Nijenborgh 4 9747AG Groningen The Netherlands
13. Department of Civil and Environmental Engineering Stanford University Stanford CA 94305 USA
14. Jet Propulsion Laboratory California Institute of Technology Pasadena CA 91109 USA