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Discussion papers
https://doi.org/10.5194/acp-2019-356
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-356
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: technical note 02 Sep 2019

Submitted as: technical note | 02 Sep 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Technical Note: Intermittent reduction of the stratospheric ozone over Northern Europe caused by a storm in Atlantic Ocean

Mikhail Sofiev1, Rostislav Kouznetsov1,2, Risto Hänninen1, and Viktoria F. Sofieva1 Mikhail Sofiev et al.
  • 1Finnish Meteorological Institute, Helsinki, 00560, Finland
  • 2AM Obukhov Institute for Atmospheric Physics, Moscow, Russia

Abstract. A three-day episode of anomalously low ozone concentrations in the stratosphere over Northern Europe occurred on 3–5 November 2018. A reduction of the total ozone column down to ~ 200–210 Dobson Units was predicted by the global forecasts of System for Integrated modeLling of Atmospheric coMposition (SILAM) driven by the weather forecast of Integrated Forecasting System (IFS) of European Centre for Medium-Range Weather Forecasting (ECMWF). The reduction down to 210–215 DU was subsequently observed by the satellite instruments, such as Ozone Monitoring Instrument (OMI) and Ozone Mapping Profile Suite (OMPS). The episode was caused by intrusion of the tropospheric air, which was initially uplifted by a storm in Northern Atlantic, south-east of Greenland. Subsequent transport towards the east and further uplift over Scandinavian ridge of this humid and low-ozone air brought it to ~ 25 km altitude causing ~ 30 % reduction of the ozone layer thickness over Northern Europe. The low-ozone air was further transported eastwards and diluted over Siberia, so that the ozone concentrations restored a few days later. High accuracy of the episode prediction 5 days in advance by the IFS-SILAM modelling tandem illustrates the model capabilities of short-term forecasting of the stratospheric composition, including such rare events.

Mikhail Sofiev et al.
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Short summary
An episode of anomalously low ozone concentrations in the stratosphere over Northern Europe occurred on 3–5 November 2018. The 30 % reduction of the ozone layer was predicted by the global chemistry transport model of Finnish Meteorological Institute driven by weather forecast of European Forecasting Centre. The reduction was subsequently observed by ozone monitoring satellites. The episode was caused by a storm in Northern Atlantic, which uplifted the air from the troposphere to stratosphere.
An episode of anomalously low ozone concentrations in the stratosphere over Northern Europe...
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