Articles | Volume 24, issue 14
https://doi.org/10.5194/acp-24-8225-2024
https://doi.org/10.5194/acp-24-8225-2024
Research article
 | 
22 Jul 2024
Research article |  | 22 Jul 2024

Changes in South American surface ozone trends: exploring the influences of precursors and extreme events

Rodrigo J. Seguel, Lucas Castillo, Charlie Opazo, Néstor Y. Rojas, Thiago Nogueira, María Cazorla, Mario Gavidia-Calderón, Laura Gallardo, René Garreaud, Tomás Carrasco-Escaff, and Yasin Elshorbany

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Cited articles

Adame, J. A., Cupeiro, M., Yela, M., Cuevas, E., and Carbajal, G.: Ozone and carbon monoxide at the Ushuaia GAW-WMO global station, Atmos. Res., 217, 1–9, https://doi.org/10.1016/j.atmosres.2018.10.015, 2019.​​​​​​​ 
Andrade, M. d. F., Kumar, P., de Freitas, E. D., Ynoue, R. Y., Martins, J., Martins, L. D., Nogueira, T., Perez-Martinez, P., de Miranda, R. M., Albuquerque, T., Gonçalves, F. L. T., Oyama, B., and Zhang, Y.: Air quality in the megacity of São Paulo: Evolution over the last 30 years and future perspectives, Atmos. Environ., 159, 66–82, https://doi.org/10.1016/j.atmosenv.2017.03.051, 2017. 
Anet, J. G., Steinbacher, M., Gallardo, L., Velásquez Álvarez, P. A., Emmenegger, L., and Buchmann, B.: Surface ozone in the Southern Hemisphere: 20 years of data from a site with a unique setting in El Tololo, Chile, Atmos. Chem. Phys., 17, 6477–6492, https://doi.org/10.5194/acp-17-6477-2017, 2017. 
Atkinson, R. and Arey, J.: Gas-phase tropospheric chemistry of biogenic volatile organic compounds: a review, Atmos. Environ., 37, 197–219, https://doi.org/10.1016/S1352-2310(03)00391-1, 2003. 
Ballesteros-González, K., Sullivan, A. P., and Morales-Betancourt, R.: Estimating the air quality and health impacts of biomass burning in northern South America using a chemical transport model, Sci. Total Environ., 739, 1–11, https://doi.org/10.1016/j.scitotenv.2020.139755, 2020. 
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Short summary
Trends of surface ozone were examined across South America. Our findings indicate that ozone trends in major South American cities either increase or remain steady, with no signs of decline. The upward trends can be attributed to chemical regimes that efficiently convert nitric oxide into nitrogen dioxide. Additionally, our results suggest a climate penalty for ozone driven by meteorological conditions that favor wildfire propagation in Chile and extensive heat waves in southern Brazil.
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