18 Jul 2022
18 Jul 2022
Status: this preprint is currently under review for the journal ACP.

Total ozone trends at three northern high-latitude stations

Leonie Bernet1, Tove Svendby1, Georg Hansen1, Yvan Orsolini1,2, Arne Dahlback3, Florence Goutail4, Andrea Pazmiño4, Boyan Petkov5,6, and Arve Kylling1 Leonie Bernet et al.
  • 1NILU - Norwegian Institute for Air Research, Kjeller, Norway
  • 2NTNU, Trondheim, Norway
  • 3Department of Physics, University of Oslo, Oslo, Norway
  • 4LATMOS/IPSL/USVSQ-CNRS, Guyancourt, France
  • 5University G. d’Annunzio, Chieti-Pescara, Italy
  • 6National Research Council, Institute of Polar Sciences (CNR-ISP), Bologna, Italy

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: final response (author comments only)

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
  • RC2: 'Comment on acp-2022-488', Anonymous Referee #2, 04 Aug 2022

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

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.