Articles | Volume 25, issue 17
https://doi.org/10.5194/acp-25-9905-2025
© 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-25-9905-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
05 Sep 2025
Research article |
| 05 Sep 2025
| 05 Sep 2025
Ground-based tropospheric ozone measurements: regional tropospheric ozone column trends from the TOAR-II/HEGIFTOM homogenized datasets
Roeland Van Malderen
CORRESPONDING AUTHOR
Royal Meteorological Institute of Belgium and Solar-Terrestrial Centre of Excellence, Uccle, Belgium
Zhou Zang
Department of Geography and Planning, University of Toronto, Toronto, Canada
Kai-Lan Chang
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
NOAA Chemical Sciences Laboratory, Boulder, CO, USA
Robin Björklund
Royal Belgian Institute for Space Aeronomy, Uccle, Belgium
Owen R. Cooper
NOAA Chemical Sciences Laboratory, Boulder, CO, USA
Department of Geography and Planning, University of Toronto, Toronto, Canada
Eliane Maillard Barras
Federal Office of Meteorology and Climatology MeteoSwiss, Payerne, Switzerland
Corinne Vigouroux
Royal Belgian Institute for Space Aeronomy, Uccle, Belgium
Irina Petropavlovskikh
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
NOAA Global Monitoring Laboratory, Boulder, CO, USA
Thierry Leblanc
Jet Propulsion Laboratory, California Institute of Technology, Wrightwood, California, USA
Valérie Thouret
Laboratoire d'Aérologie, Université Toulouse III – Paul Sabatier, CNRS, Toulouse, France
Pawel Wolff
Observatoire Midi-Pyrénées, Université Toulouse III – Paul Sabatier, CNRS, Toulouse, France
Peter Effertz
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
NOAA Global Monitoring Laboratory, Boulder, CO, USA
Audrey Gaudel
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
NOAA Chemical Sciences Laboratory, Boulder, CO, USA
David W. Tarasick
Environment and Climate Change Canada, Downsview, ON, Canada
Herman G. J. Smit
Institute of Climate and Energy Systems 3: Troposphere (ICE-3), Forschungszentrum Jülich (FZJ), Jülich, Germany
Anne M. Thompson
Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
GESTAR, University of Maryland, Baltimore County, Baltimore, MD, USA
Ryan M. Stauffer
Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
Debra E. Kollonige
Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
Science Systems and Applications, Inc, Lanham, MD, USA
Deniz Poyraz
Royal Meteorological Institute of Belgium and Solar-Terrestrial Centre of Excellence, Uccle, Belgium
Gérard Ancellet
LATMOS, Sorbonne Université, Université Versailles St-Quentin, CNRS/INSU, Paris, France
Marie-Renée De Backer
Groupe de Spectrométrie Moléculaire et Atmosphérique, Université de Reims, Reims, France
Matthias M. Frey
IMKASF, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany
James W. Hannigan
Atmospheric Chemistry, Observations & Modeling, National Center for Atmospheric Research, Boulder, CO, USA
José L. Hernandez
Spanish Meteorological Agency (AEMET), Madrid, Spain
Bryan J. Johnson
NOAA Global Monitoring Laboratory, Boulder, CO, USA
Nicholas Jones
School of Physics, University of Wollongong, Wollongong, Australia
Rigel Kivi
Finnish Meteorological Institute, Space and Earth Observation Centre, Sodankylä, Finland
Emmanuel Mahieu
Institut d'Astrophysique et de Géophysique, Université de Liège, Liège, Belgium
Isamu Morino
Earth System Division, National Institute for Environmental Studies, Tsukuba, Japan
Glen McConville
NOAA Global Monitoring Laboratory, Boulder, CO, USA
Katrin Müller
Alfred Wegener Institute, Helmholtz-Centre for Polar and Marine Research, Potsdam, Germany
Isao Murata
Graduate School of Environmental Studies, Tohoku University, Sendai, Japan
Justus Notholt
Institute of Environmental Physics, University of Bremen, Bremen, Germany
Ankie Piters
Royal Netherlands Meteorological Institute (KNMI), De Bilt, the Netherlands
Maxime Prignon
Space Earth and Environment, Chalmers University of Technology, Gothenburg, Sweden
Richard Querel
National Institute of Water and Atmospheric Research (NIWA), Lauder, New Zealand
Vincenzo Rizi
CETEMPS Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, L'Aquila, Italy
Dan Smale
National Institute of Water and Atmospheric Research (NIWA), Lauder, New Zealand
Wolfgang Steinbrecht
Deutscher Wetterdienst, Hohenpeissenberg, Germany
Kimberly Strong
Department of Physics, University of Toronto, Toronto, ON, Canada
Ralf Sussmann
Karlsruhe Institute of Technology (KIT), IMK-IFU, Garmisch-Partenkirchen, Germany
Data sets
HEGIFTOM homogenized ozone profile and TrOC datasets R. Van Malderen et al. http://hegiftom.meteo.be
Trajectory-mapped Ozonesonde dataset for the Stratosphere and Troposphere Z. Zang et al. https://doi.org/10.5281/zenodo.13984483
Short summary
Tropospheric ozone is an important greenhouse gas and an air pollutant whose distribution and time variability are mainly governed by anthropogenic emissions and dynamics. In this paper, we assess regional trends of tropospheric ozone column amounts, based on two different approaches of merging or synthesizing ground-based observations and their trends within specific regions. Our findings clearly demonstrate regional trend differences but also consistently higher pre-COVID than post-COVID trends.
Tropospheric ozone is an important greenhouse gas and an air pollutant whose distribution and...
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