1. Center for Accelerator Mass Spectrometry Lawrence Livermore National Laboratory Livermore CA USA
2. Now at Combustion Research Facility Sandia National Laboratories Livermore California USA
3. Global Monitoring Division NOAA Earth Systems Research Laboratory Boulder Colorado USA
4. Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder Boulder Colorado USA
5. Institute for Arctic and Alpine Research University of Colorado Boulder Boulder Colorado USA
6. Now at Department of Crops and Soil Science Oregon State University Corvallis Oregon USA
7. Center for Isotope Research, Energy and Sustainability Research Institute Groningen University of Groningen Groningen Netherlands
8. Now at Ramboll Environ US Corporation Novato California USA
9. National Isotope Centre GNS Science Lower Hutt New Zealand
10. Department of Earth System Science University of California Irvine California USA