Articles | Volume 25, issue 22
https://doi.org/10.5194/acp-25-16833-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-16833-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
26 Nov 2025
Research article |
| 26 Nov 2025
| 26 Nov 2025
Explaining trends and changing seasonal cycles of surface ozone in North America and Europe over the 2000–2018 period: a global modelling study with NOx and VOC tagging
Tabish Ansari
CORRESPONDING AUTHOR
Research Institute for Sustainability at the GFZ (RIFS), 14467 Potsdam, Germany
Aditya Nalam
Research Institute for Sustainability at the GFZ (RIFS), 14467 Potsdam, Germany
Institut für Meteorologie, Freie Universität Berlin, Berlin, Germany
now at: Department of Atmospheric Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
Aurelia Lupaşcu
European Center for Medium Range Weather Forecasts (ECMWF), 53175 Bonn, Germany
Carsten Hinz
Jülich Supercomputing Centre (JSC), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
Simon Grasse
Jülich Supercomputing Centre (JSC), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
Tim Butler
Research Institute for Sustainability at the GFZ (RIFS), 14467 Potsdam, Germany
Institut für Meteorologie, Freie Universität Berlin, Berlin, Germany
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Short summary
Surface ozone can travel far from its sources. In recent decades, emissions of ozone-forming gases have decreased in North America and Europe but risen in Asia, alongside rising global methane levels. Using advanced modeling, this study reveals that while local reductions in nitrogen oxides have lowered summer ozone, increases in ozone production from natural and foreign sources offset these gains. Methane remains important, but its ozone impact has declined with reduced local emissions.
Surface ozone can travel far from its sources. In recent decades, emissions of ozone-forming...
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