@article{30707,
  author = {Heather Graven and Marc L Fischer and T Lueker and Seongeun Jeong and Tom Guilderson and Ralph Keeling and Ray P Bambha and Kieran Brophy and W Callahan and Xinguang Cui and C Frankenberg and Kevin R Gurney and Brian W LaFranchi and Scott J Lehman and Hope A Michelsen and John B Miller and Sally Newman and W Paplawsky and Nicholas Parazoo and Christopher D Sloop and S.J Walker},
  title = {Assessing fossil fuel CO <sub>2</sub> emissions in California using atmospheric observations and models},
  abstract = {<p>Analysis systems incorporating atmospheric observations could provide a powerful tool for validating fossil fuel CO<sub>2</sub> (ffCO<sub>2</sub>) emissions reported for individual regions, provided that fossil fuel sources can be separated from other CO<sub>2</sub> sources or sinks and atmospheric transport can be accurately accounted for. We quantified ffCO<sub>2</sub> by measuring radiocarbon (<sup>14</sup>C) in CO<sub>2</sub>, an accurate fossil-carbon tracer, at nine observation sites in California for three months in 2014–15. There is strong agreement between the measurements and ffCO<sub>2</sub> simulated using a high-resolution atmospheric model and a spatiotemporally-resolved fossil fuel flux estimate. Inverse estimates of total in-state ffCO<sub>2</sub> emissions are consistent with the California Air Resources Board's reported ffCO<sub>2</sub> emissions, providing tentative validation of California's reported ffCO<sub>2</sub> emissions in 2014–15. Continuing this prototype analysis system could provide critical independent evaluation of reported ffCO<sub>2</sub> emissions and emissions reductions in California, and the system could be expanded to other, more data-poor regions.</p>},
  year = {2018},
  journal = {Environmental Research Letters},
  volume = {13},
  pages = {065007},
  month = {01/2018},
  doi = {10.1088/1748-9326/aabd43},
  language = {eng},
}