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: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

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Cumulative views and downloads (calculated since 12 Feb 2024)

Month	HTML	PDF	XML	Total
Feb 2024	178	54	6	238
Mar 2024	146	25	10	181
Apr 2024	72	19	4	95
May 2024	94	29	5	128
Jun 2024	69	19	5	93
Jul 2024	337	82	12	431
Aug 2024	121	40	8	169
Sep 2024	91	22	3	116
Oct 2024	82	13	0	95
Nov 2024	51	7	1	59
Dec 2024	51	13	0	64
Jan 2025	84	8	4	96
Feb 2025	50	8	2	60
Mar 2025	45	8	0	53
Apr 2025	79	10	1	90
May 2025	84	5	2	91
Jun 2025	101	8	3	112
Jul 2025	69	16	2	87
Aug 2025	104	9	0	113
Sep 2025	165	10	1	176
Oct 2025	62	25	2	89
Nov 2025	58	23	4	85
Dec 2025	14	3	0	17

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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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