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Journal Articles (Review Article) Atmospheric Chemistry and Physics Year : 2023

Total ozone trends at three northern high-latitude stations


Afterthedecreaseofozone-depletingsubstances(ODSs)asaconsequenceoftheMontrealProtocol, it is still challenging to detect a recovery in the total column amount of ozone (total ozone) at northern high latitudes. To assess regional total ozone changes in the “ozone-recovery” period (2000–2020) at northern high latitudes, this study investigates trends from ground-based total ozone measurements at three stations in Norway (Oslo, Andøya, and Ny-Ålesund). For this purpose, we combine measurements from Brewer spectrophotome- ters, ground-based UV filter radiometers (GUVs), and a SAOZ (Système d’Analyse par Observation Zénithale) instrument. The Brewer measurements have been extended to work under cloudy conditions using the global ir- radiance (GI) technique, which is also presented in this study. We derive trends from the combined ground-based time series with the multiple linear regression model from the Long-term Ozone Trends and Uncertainties in the Stratosphere (LOTUS) project. We evaluate various predictors in the regression model and found that tropopause pressure and lower-stratospheric temperature contribute most to ozone variability at the three stations. We report significantly positive annual trends at Andøya (0.9 ± 0.7 % per decade) and Ny-Ålesund (1.5 ± 0.1 % per decade) and no significant annual trend at Oslo (0.1 ± 0.5 % per decade) but significantly positive trends in autumn at all stations. Finally we found positive but insignificant trends of around 3 % per decade in March at all three stations, which may be an indication of Arctic springtime ozone recovery. Our results contribute to a better understanding of regional total ozone trends at northern high latitudes, which is essential to assess how Arctic ozone responds to changes in ODSs and to climate change.
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insu-04060799 , version 1 (06-04-2023)





Leonie Bernet, Tove Svendby, Georg Hansen, Yvan Orsolini, Arne Dahlback, et al.. Total ozone trends at three northern high-latitude stations. Atmospheric Chemistry and Physics, 2023, 23, pp.4165-4184. ⟨10.5194/acp-23-4165-2023⟩. ⟨insu-04060799⟩
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