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

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

doi:https://doi.org/10.5194/acp-24-8225-2024

Articles | Volume 24, issue 14

https://doi.org/10.5194/acp-24-8225-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Tropospheric Ozone Assessment Report Phase II (TOAR-II) Community...

https://doi.org/10.5194/acp-24-8225-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 24, issue 14

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

Supplement

https://doi.org/10.5194/acp-24-8225-2024-supplement

Data sets

MODIS/Terra Thermal Anomalies/Fire Daily L3 Global 1km SIN Grid V061 L. Giglio and C. Justice https://doi.org/10.5067/MODIS/MOD14A1.061

Región Metropolitana de Santiago SINCA https://sinca.mma.gob.cl/index.php/region/index/id/M

Región del Libertador General Bernardo O'Higgins SINCA https://sinca.mma.gob.cl/index.php/region/index/id/VI

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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.