- 1Royal Belgian Institute for Space Aeronomy , Infrared observations, Belgium
- 2LATMOS/IPSL, Sorbonne Université, UVSQ, CNRS, Paris, 75252, France
- 3Atmospheric Chemistry Observations & Modeling, National Center for Atmospheric Research, Boulder, Colorado, USA
- 4Danish Meteorological Institute, København Ø, Denmark
- 5Space and Earth Observation Centre, Finnish Meteorological Institute, 99600, Sodankylä, Finland
- 6Meteorological Office, Lerwick, Shetland, ZE1 ORR United Kingdom
- 7Department of Space, Earth and Environment, Chalmers University of Technology, Göteborg, Sweden
- 8Institute of Environmental Physics, University of Bremen, Bremen, Germany
- 9Finnish Meteorological Institute, Helsinki, Finland
- 10Department of Physics, University of Toronto, Toronto, ON, Canada
- 11Environment and Climate Change Canada, Ontario, ON M3H 5T4, Canada
- 12Saint Petersburg State University, St. Petersburg, Russia
Polar regions are strategic in the study of stratospheric long-term ozone trends: since these regions are highly impacted by the effective-chlorine levels, the ozone recovery expected from the reduced emission of ozone depleting substances (Montreal Protocol) should be observed most easily there. However, contrary to the Antarctic, positive ozone trends have not yet been observed in the Arctic (WMO 2022) due to the higher natural variability of ozone in that region. Studying tropospheric ozone trends in the Arctic is also crucial because it can help in reconciling total and stratospheric ozone trends, additionally to the intrinsic interest in ground-level ozone as one of the main greenhouse gases.
The Network for the Detection of Atmospheric Composition Change (NDACC) provides amongst others long-term ozone data from Fourier Transform Infrared (FTIR) spectrometers as well as ozone sonde instruments. We present long-term trends (2000-2022) for total, stratospheric and tropospheric ozone from seven FTIR ground-based stations and from seven ozone sonde stations in the Arctic. The FTIR stratospheric trends are provided in three different layers, covering the lower stratosphere up to 45 km, according to the FTIR vertical resolution. Based on a previous representativeness study, we also obtain regional trends with reduced uncertainties by combining different instruments and stations. Annual and seasonal trends are calculated using a multiple linear regression technique involving a set of proxies that represent physical processes influencing the natural ozone variability. Using this network of ground-based measurements, we further validate tropospheric and stratospheric ozone trends in the Arctic as derived from satellite observations (MEGRIDOP, SUNLIT, IASI).
How to cite: Jonas, C., Björklund, R., Vigouroux, C., De Mazière, M., Langerock, B., Boynard, A., Hannigan, J. W., Jepsen, N., Kivi, R., Lyall, N., Mellqvist, J., Palm, M., Sofieva, V., Strong, K., Tarasick, D., and Virolainen, Y.: Looking for ozone recovery in the Arctic, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-18197, https://doi.org/10.5194/egusphere-egu25-18197, 2025.
