Article Dans Une Revue Atmospheric Chemistry and Physics Année : 2025

Global Ground-based Tropospheric Ozone Measurements: Reference Data and Individual Site Trends (2000–2022) from the TOAR-II/HEGIFTOM Project

1 IRM - Institut Royal Météorologique de Belgique [Bruxelles] - Royal Meteorological Institute of Belgium
2 GSFC - NASA Goddard Space Flight Center
3 JCET - Joint Center for Earth Systems Technology [Baltimore]
4 SSAI - Science Systems and Applications, Inc. [Lanham]
5 FZJ - Forschungszentrum Jülich GmbH | Centre de recherche de Jülich | Jülich Research Centre
6 Federal Office of Meteorology and Climatology MeteoSwiss
7 BIRA-IASB - Royal Belgian Institute for Space Aeronomy
8 CIRES - Cooperative Institute for Research in Environmental Sciences
9 GML - ESRL Global Monitoring Laboratory [Boulder]
10 JPL - Jet Propulsion Laboratory
11 LAERO - Laboratoire d'aérologie
12 OMP - Observatoire Midi-Pyrénées
13 ECCC - Environment and Climate Change Canada
14 ATMOSPHERE - LATMOS
15 GSMA - Groupe de spectrométrie moléculaire et atmosphérique
16 LACy - Laboratoire de l'Atmosphère et des Cyclones
17 Department of Physics [Toronto]
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 Centre of Excellence CETEMPS
22 CAC - Centre for Atmospheric Chemistry [Wollongong]
23 FMI - Finnish Meteorological Institute
24 Institut d'Astrophysique et de Géophysique [Liège]
25 Alfred Wegener Institute [Potsdam]
26 ISEE - Institute for Space-Earth Environmental Research [Nagoya]
27 IUP - Institute of Environmental Physics [Bremen]
28 KNMI - Royal Netherlands Meteorological Institute
29 IARC - Izaña Atmospheric Research Center
30 NIWA - National Institute of Water and Atmospheric Research [Lauder]
31 DWD - Deutscher Wetterdienst [Offenbach]
32 KIT - Karlsruhe Institute of Technology = Karlsruher Institut für Technologie
Ryan M Stauffer
Victoria Flood
Rigel Kivi
Katrin Müller
Wolfgang Steinbrecht
Kimberly Strong

Résumé

Tropospheric ozone trends from models and satellites are found to diverge. Ground-based (GB) observations are used to reference models and satellites but GB data themselves might display station biases and discontinuities. Re-processing with uniform procedures, the TOAR-II Working Group Harmonization and Evaluation of Ground-based Instruments for Free-Tropospheric Ozone Measurements (HEGIFTOM) homogenized public data from 5 networks: ozonesondes, In-service Aircraft for a Global Observing System (IAGOS) profiles, solar absorption Fourier-Transform Infrared (FTIR) spectrometer measurements, Lidar observations, and Dobson Umkehr data. Amounts and uncertainties for total tropospheric ozone (“TrOC”, surface to 300 hPa), free and lower tropospheric ozone, are calculated for each network. We report trends (2000 to 2022) for these segments using Quantile Regression (QR) and Multiple Linear Regression (MLR) for 55 datasets, including 6 multi-instrument stations. The findings: (1) Median TrOC trends computed with QR and MLR trends are essentially the same; (2) Pole-to-pole, across all longitudes, TrOC trends fall within +3 ppbv/decade to -3 ppbv/decade, equivalent to (-4 % to + 8 %)/decade depending on site. (3) The greatest fractional increases occur over most tropical/subtropical sites with decreases at northern high latitudes but these patterns are not uniform. (4) Post-COVID trends are smaller than pre-COVID trends for Northern Hemisphere mid-latitude sites. In summary, this analysis conducted in the frame of TOAR-II/HEGIFTOM shows that high-quality, multi-instrument, harmonized data over a wide range of ground sites provide clear standard references for TOAR-II models and evolving tropospheric ozone satellite products for 2000–2022.
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hal-04901618 , version 1 (20-01-2025)

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Roeland van Malderen, Anne M Thompson, Debra E Kollonige, Ryan M Stauffer, Herman G J Smit, et al.. Global Ground-based Tropospheric Ozone Measurements: Reference Data and Individual Site Trends (2000–2022) from the TOAR-II/HEGIFTOM Project. Atmospheric Chemistry and Physics, In press, ⟨10.5194/egusphere-2024-3736⟩. ⟨hal-04901618⟩
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