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

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Jan 2025	644	140	24	808
Feb 2025	288	49	20	357
Mar 2025	267	33	10	310
Apr 2025	134	50	10	194
May 2025	122	25	5	152
Jun 2025	185	5	10	200
Jul 2025	198	40	5	243
Aug 2025	1,103	33	5	1,141
Sep 2025	3,139	56	14	3,209
Oct 2025	190	30	10	230
Nov 2025	265	75	20	360
Dec 2025	282	129	23	434
Jan 2026	382	134	30	546
Feb 2026	217	72	10	299
Mar 2026	421	68	3	492
Apr 2026	79	39	2	120
May 2026	316	75	15	406
Jun 2026	62	14	12	88
Jul 2026	111	48	30	189
Aug 2026	79	45	26	150
Sep 2026	214	189	126	529
Oct 2026	51	23	35	109

Cumulative views and downloads (calculated since 14 Jan 2025)

Month	HTML	PDF	XML	Total
Jan 2025	644	140	24	808
Feb 2025	288	49	20	357
Mar 2025	267	33	10	310
Apr 2025	134	50	10	194
May 2025	122	25	5	152
Jun 2025	185	5	10	200
Jul 2025	198	40	5	243
Aug 2025	1,103	33	5	1,141
Sep 2025	3,139	56	14	3,209
Oct 2025	190	30	10	230
Nov 2025	265	75	20	360
Dec 2025	282	129	23	434
Jan 2026	382	134	30	546
Feb 2026	217	72	10	299
Mar 2026	421	68	3	492
Apr 2026	79	39	2	120
May 2026	316	75	15	406
Jun 2026	62	14	12	88
Jul 2026	111	48	30	189
Aug 2026	79	45	26	150
Sep 2026	214	189	126	529
Oct 2026	51	23	35	109

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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.


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