Articles | Volume 23, issue 22
https://doi.org/10.5194/acp-23-14425-2023
https://doi.org/10.5194/acp-23-14425-2023
Research article
 | 
22 Nov 2023
Research article |  | 22 Nov 2023

Quantification of fossil fuel CO2 from combined CO, δ13CO2 and Δ14CO2 observations

Jinsol Kim, John B. Miller, Charles E. Miller, Scott J. Lehman, Sylvia E. Michel, Vineet Yadav, Nick E. Rollins, and William M. Berelson

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Cited articles

Ahn, D. Y., Hansford, J. R., Howe, S. T., Ren, X. R., Salawitch, R. J., Zeng, N., Cohen, M. D., Stunder, B., Salmon, O. E., Shepson, P. B., Gurney, K. R., Oda, T., Lopez-Coto, I., Whetstone, J., and Dickerson, R. R.: Fluxes of Atmospheric Greenhouse-Gases in Maryland (FLAGG-MD): Emissions of Carbon Dioxide in the Baltimore, MD-Washington, D.C. Area, J. Geophys. Res.-Atmos., 125, 1–23, https://doi.org/10.1029/2019JD032004, 2020. 
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Bakwin, P. S., Tans, P. P., White, J. W. C., and Andres, R. J.: Determination of the isotopic (13C/12C) discrimination of terrestrial biology from a global network of observations, Global Biogeochem. Cy., 12, 555–562, https://doi.org/10.1029/98GB02265, 1998b. 
Bréon, F. M., Broquet, G., Puygrenier, V., Chevallier, F., Xueref-Remy, I., Ramonet, M., Dieudonné, E., Lopez, M., Schmidt, M., Perrussel, O., and Ciais, P.: An attempt at estimating Paris area CO2 emissions from atmospheric concentration measurements, Atmos. Chem. Phys., 15, 1707–1724, https://doi.org/10.5194/acp-15-1707-2015, 2015. 
Cambaliza, M. O. L., Shepson, P. B., Caulton, D. R., Stirm, B., Samarov, D., Gurney, K. R., Turnbull, J., Davis, K. J., Possolo, A., Karion, A., Sweeney, C., Moser, B., Hendricks, A., Lauvaux, T., Mays, K., Whetstone, J., Huang, J., Razlivanov, I., Miles, N. L., and Richardson, S. J.: Assessment of uncertainties of an aircraft-based mass balance approach for quantifying urban greenhouse gas emissions, Atmos. Chem. Phys., 14, 9029–9050, https://doi.org/10.5194/acp-14-9029-2014, 2014. 
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In this study, we present the partitioning of CO2 signals from biogenic, petroleum and natural gas sources by combining CO, 13CO2 and 14CO2 measurements. Using measurements from flask air samples at three sites in the greater Los Angeles region, we find larger and positive contributions of biogenic signals in winter and smaller and negative contributions in summer. The largest contribution of natural gas combustion generally occurs in summer.
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