Article Dans Une Revue Atmospheric Chemistry and Physics Année : 2025

Ground-based Tropospheric Ozone Measurements: Regional tropospheric ozone column trends from the TOAR-II/ HEGIFTOM homogenized datasets

1 IRM - Institut Royal Météorologique de Belgique [Bruxelles] - Royal Meteorological Institute of Belgium
2 Department of Geography and Planning [University of Toronto]
3 CIRES - Cooperative Institute for Research in Environmental Sciences
4 CSL - NOAA Chemical Sciences Laboratory
5 BIRA-IASB - Royal Belgian Institute for Space Aeronomy
6 Federal Office of Meteorology and Climatology MeteoSwiss
7 GML - ESRL Global Monitoring Laboratory [Boulder]
8 JPL - Jet Propulsion Laboratory
9 LAERO - Laboratoire d'aérologie
10 OMP - Observatoire Midi-Pyrénées
11 ECCC - Environment and Climate Change Canada
12 FZJ - Forschungszentrum Jülich GmbH | Centre de recherche de Jülich | Jülich Research Centre
13 GSFC - NASA Goddard Space Flight Center
14 GESTAR II - Goddard Earth Sciences Technology and Research II Center
15 SSAI - Science Systems and Applications, Inc. [Lanham]
16 ATMOSPHERE - LATMOS
17 GSMA - Groupe de spectrométrie moléculaire et atmosphérique
18 IMK-ASF - Institut für Meteorologie und Klimaforschung - Atmosphärische Spurengase und Fernerkundung
19 NCAR - National Center for Atmospheric Research [Boulder]
20 AEMet - Agencia Estatal de Meteorología
21 CAC - Centre for Atmospheric Chemistry [Wollongong]
22 FMI - Finnish Meteorological Institute
23 Institut d'Astrophysique et de Géophysique [Liège]
24 NIES - National Institute for Environmental Studies
25 Alfred Wegener Institute [Potsdam]
26 Graduate School of Science [Sendai]
27 IUP - Institute of Environmental Physics [Bremen]
28 KNMI - Royal Netherlands Meteorological Institute
29 SEE - Department of Space, Earth and Environment
30 NIWA - National Institute of Water and Atmospheric Research [Lauder]
31 Centre of Excellence CETEMPS
32 DWD - Deutscher Wetterdienst [Offenbach]
33 Department of Physics [Toronto]
34 KIT - Karlsruhe Institute of Technology = Karlsruher Institut für Technologie
Ryan M Stauffer
Rigel Kivi
Katrin Müller
Vincenzo Rizi
Wolfgang Steinbrecht
Kimberly Strong

Résumé

The quantification of long-term free-tropospheric ozone trends is essential for understanding the impact of human activities and climate change on atmospheric chemistry, but is challenged by the diversity between satellite tropospheric ozone records and the sparse temporal and spatial sampling of ground-based measurements. Here, we explore if a more consistent understanding of the geographical distribution of tropospheric ozone column (TrOC) trends can be obtained by focusing on regional trends calculated from ground-based measurements. Regions were determined with a correlation analysis between modelled TrOCs at the site locations. For those regions, TrOC trends were estimated with Quantile Regression and Dynamical Linear Modelling for the Trajectory-mapped Ozonesonde dataset for the Stratosphere and Troposphere (TOST), and with a linear mixed-effects modelling (LMM) approach to calculate synthesized trends from the homogenized HEGIFTOM (Harmonization and Evaluation of Ground-based Instruments for Free-Tropospheric Ozone Measurements) individual site trends. For different periods (1990–2021/22, 1995–2021/22, 2000–2021/22), both approaches give increasing (partial) tropospheric ozone column amounts over almost all Asian regions (median confidence), and negative trends over the Arctic regions (very high confidence). Trends over Europe and North America are mostly weakly positive (LMM method) or negative (TOST). For both approaches, the 2000–2021/22 trends decreased in magnitude compared to the 1995–2021/22 for most of the regions, and for all time periods and regions, the pre-COVID trends are larger than the post-COVID trends. Our results enable the validation of global satellite TrOC trends, and assessment of the performance of atmospheric chemistry models to represent the distribution and variation of TrOC.
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hal-04901762 , version 1 (20-01-2025)

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Roeland van Malderen, Zhou Zang, Kai-Lan Chang, Robin Björklund, Owen R Cooper, et al.. Ground-based Tropospheric Ozone Measurements: Regional tropospheric ozone column trends from the TOAR-II/ HEGIFTOM homogenized datasets. Atmospheric Chemistry and Physics, In press, ⟨10.5194/egusphere-2024-3745⟩. ⟨hal-04901762⟩
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