Preprints
https://doi.org/10.5194/acp-2022-488
https://doi.org/10.5194/acp-2022-488
18 Jul 2022
 | 18 Jul 2022
Status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Total ozone trends at three northern high-latitude stations

Leonie Bernet, Tove Svendby, Georg Hansen, Yvan Orsolini, Arne Dahlback, Florence Goutail, Andrea Pazmiño, Boyan Petkov, and Arve Kylling

Abstract. After the decrease of ozone-depleting substances (ODSs) as a consequence of the Montreal Protocol, 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 spectrophotometers, ground-based UV filter radiometers (GUVs), and a SAOZ instrument. The Brewer measurements have been extended to work under cloudy conditions using the global irradiance (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 significant positive trends at Andøya (0.9 % per decade) and Ny-Ålesund (1.5 % per decade) and no annual trends at Oslo, but significant 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 for Arctic spring-time 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.

Leonie Bernet et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-488', Corinne Vigouroux, 29 Jul 2022
    • AC1: 'Authors final response', Leonie Bernet, 30 Jan 2023
  • RC2: 'Comment on acp-2022-488', Anonymous Referee #2, 04 Aug 2022
    • AC1: 'Authors final response', Leonie Bernet, 30 Jan 2023
  • AC1: 'Authors final response', Leonie Bernet, 30 Jan 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-488', Corinne Vigouroux, 29 Jul 2022
    • AC1: 'Authors final response', Leonie Bernet, 30 Jan 2023
  • RC2: 'Comment on acp-2022-488', Anonymous Referee #2, 04 Aug 2022
    • AC1: 'Authors final response', Leonie Bernet, 30 Jan 2023
  • AC1: 'Authors final response', Leonie Bernet, 30 Jan 2023

Leonie Bernet et al.

Data sets

Combined ground-based total ozone data at three Norwegian sites (2000 to 2020) Bernet, Leonie; Svendby, Tove; Hansen, Georg; Goutail, Florence; Pazmiño, Andrea; Petkov, Boyan https://doi.org/10.5281/zenodo.6760259

Leonie Bernet et al.

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Short summary
After the severe destruction of the ozone layer, the amount of ozone in the stratosphere is expected to increase again. At northern high-latitudes, however, such a recovery has not been detected yet. To assess ozone changes in that region, we analyse the amount of ozone above specific locations (total ozone) measured at three stations in Norway. We found that total ozone increases significantly at two Arctic stations, which may be an indication for ozone recovery at northern high-latitudes.
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