Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 25, issue 23
Articles | Volume 25, issue 23
https://doi.org/10.5194/acp-25-17651-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-17651-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 25, issue 23
Research article
 | 
04 Dec 2025
Research article |  | 04 Dec 2025

Temperature and stagnation effects on ozone sensitivity to NOx and VOC: an adjoint modeling study in central California

Yuhan Wang, Lucas A. J. Bastien, Yuan Wang, Ling Jin, and Robert A. Harley

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Cited articles

Ashok, A. and Barrett, S. R. H: Adjoint-based computation of U.S. nationwide ozone exposure isopleths, Atmospheric Environment, 133, 68–80, https://doi.org/10.1016/j.atmosenv.2016.03.025, 2016. 
Baertsch-Ritter, N., Keller, J., Dommen, J., and Prevot, A. S. H.: Effects of various meteorological conditions and spatial emissionresolutions on the ozone concentration and ROG/NOx limitationin the Milan area (I), Atmos. Chem. Phys., 4, 423–438, https://doi.org/10.5194/acp-4-423-2004, 2004. 
Bastien, L. A. J., McDonald, B. C., Brown, N. J., and Harley, R. A.: High-Resolution Mapping of Sources Contributing to Urban Air Pollution Using Adjoint Sensitivity Analysis: Benzene and Diesel Black Carbon, Environmental Science & Technology, 49, 7276–7284, https://doi.org/10.1021/acs.est.5b00686, 2015. 
Bastien, L. A. J., Brown, N. J., and Harley, R. A.: Contributions to local- and regional-scale formaldehyde concentrations, Atmos. Chem. Phys., 19, 8363–8381, https://doi.org/10.5194/acp-19-8363-2019, 2019. 
Biswas, J. and Rao, S. T.: Uncertainties in Episodic Ozone Modeling Stemming from Uncertainties in the Meteorological Fields, Journal of Applied Meteorology, 40, 117–136, https://doi.org/10.1175/1520-0450(2001)040<0117:UIEOMS>2.0.CO;2, 2001. 
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Climate change is making heatwaves and stagnant weather more frequent, which can worsen air pollution. We studied how these extreme conditions affect the sources of summer ozone in California's Central Valley. Using a state-of-the-art modeling tool, we found that weather changes can greatly shift which, where, and when to reduce emissions for the largest air quality benefits. Our results highlight the need to account for extreme weather in designing effective air quality strategies.
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