Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 25, issue 18
Articles | Volume 25, issue 18
https://doi.org/10.5194/acp-25-10479-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-10479-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 25, issue 18
Research article
 | 
15 Sep 2025
Research article |  | 15 Sep 2025

Mid-Atlantic US observations of radiocarbon in CO2: fossil and biogenic source partitioning and model evaluation

Bianca C. Baier, John B. Miller, Colm Sweeney, Scott J. Lehman, Chad Wolak, Joshua P. DiGangi, Yonghoon Choi, Kenneth Davis, Sha Feng, and Thomas Lauvaux

Supplement

https://doi.org/10.5194/acp-25-10479-2025-supplement

Data sets

ACT-America: L3 Merged In Situ Atmospheric Trace Gases and Flask Data K. J. Davis et al. https://doi.org/10.3334/ORNLDAAC/1593

ACT-America Flask Data C. Sweeney et al. https://doi.org/10.3334/ORNLDAAC/1575

ACT-America Meteorological and Aircraft Navigational Data M. M. Yang et al. https://doi.org/10.3334/ORNLDAAC/1574

NOAA GGGRN D14CO2 and CO Flask Data B. Baier et al. https://doi.org/10.15138/87ny-6277

ACT-America: WRF-Chem Baseline Simulations for North America, 2016-2019 S. Feng et al. https://doi.org/10.3334/ORNLDAAC/1884

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Short summary
CO2 radiocarbon content (Δ14CO2) is a unique tracer that helps to accurately quantify anthropogenic CO2 emitted into the atmosphere. Δ14CO2 measured in airborne flask samples is used to distinguish fossil versus biogenic CO2 sources. Mid-Atlantic US CO2 variability is found to be driven by the biosphere. Errors in modeled fossil fuel CO2 are evaluated using Δ14CO2 airborne data as an avenue to improving future regional models of atmospheric CO2 transport.
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