Assessment of regional and interannual variations in tropospheric ozone in chemical reanalyses

Jones, Dylan B. A.; Prates, Lucas; Qu, Zhen; Cheng, William Y. Y.; Miyazaki, Kazuyuki; Sekiya, Takashi; Inness, Antje; Kumar, Rajesh; Tang, Xiao; Worden, Helen; Koren, Gerbrand; Huijnen, Vincent

doi:10.5194/acp-26-6655-2026

Articles | Volume 26, issue 10

https://doi.org/10.5194/acp-26-6655-2026

© Author(s) 2026. 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-26-6655-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 26, issue 10

Research article

|

18 May 2026

Research article |

| 18 May 2026

Assessment of regional and interannual variations in tropospheric ozone in chemical reanalyses

Dylan B. A. Jones, Lucas Prates, Zhen Qu, William Y. Y. Cheng, Kazuyuki Miyazaki, Takashi Sekiya, Antje Inness, Rajesh Kumar, Xiao Tang, Helen Worden, Gerbrand Koren, and Vincent Huijnen

Supplement

https://doi.org/10.5194/acp-26-6655-2026-supplement

Data sets

CAMS global reanalysis (EAC4) Copernicus Atmosphere Monitoring Service https://doi.org/10.24381/d58bbf47

CONUS air quality reanalysis dataset (2005-2018) R. Kumar and C. He https://doi.org/10.5065/cfya-4g50

Global (2°x2.5°) top-down NOx emissions from OMI NASA product (2005-2016) Zhen Qu et al. https://doi.org/10.7910/DVN/HVT1FO

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Short summary

We evaluate five chemical reanalysis products to assess their potential to provide useful information on tropospheric ozone variability. We find that the reanalyses produce consistent information on ozone variations in the free troposphere, but have large discrepancies at the surface. The results suggests that improvements in the reanalyses are needed to better exploit the assimilated observations to enhance the utility of the reanalysis products at the surface.