Polar mesospheric ozone loss initiates downward coupling of solar signal in the Northern Hemisphere
Abstract Solar driven energetic particle precipitation (EPP) is an important factor in polar atmospheric ozone balance and has been linked to ground-level regional climate variability. However, the linking mechanism has remained ambiguous. The observed and simulated ground-level changes start well b...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-01-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-025-55966-z |
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| author | Annika Seppälä Niilo Kalakoski Pekka T. Verronen Daniel R. Marsh Alexey Yu. Karpechko Monika E. Szelag |
| author_facet | Annika Seppälä Niilo Kalakoski Pekka T. Verronen Daniel R. Marsh Alexey Yu. Karpechko Monika E. Szelag |
| author_sort | Annika Seppälä |
| collection | DOAJ |
| description | Abstract Solar driven energetic particle precipitation (EPP) is an important factor in polar atmospheric ozone balance and has been linked to ground-level regional climate variability. However, the linking mechanism has remained ambiguous. The observed and simulated ground-level changes start well before the processes from the main candidate, the so-called EPP-indirect effect, would start. Here we show that initial reduction of polar mesospheric ozone and the resulting change in atmospheric heating rapidly couples to dynamics, transferring the signal downwards, shifting the tropospheric jet polewards. This pathway is not constrained to the polar vortex. Rather, a subtropical route initiated by a changing wind shear plays a key role. Our results show that the signal propagates downwards in timescales consistent with observed tropospheric level climatic changes linked to EPP. This pathway, from mesospheric ozone to regional climate, is independent of the EPP-indirect effect, and solves the long-standing mechanism problem for EPP effects on climate. |
| format | Article |
| id | doaj-art-9e7f8d9dc68a42a582561b04d901744a |
| institution | Kabale University |
| issn | 2041-1723 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-9e7f8d9dc68a42a582561b04d901744a2025-01-19T12:30:12ZengNature PortfolioNature Communications2041-17232025-01-011611710.1038/s41467-025-55966-zPolar mesospheric ozone loss initiates downward coupling of solar signal in the Northern HemisphereAnnika Seppälä0Niilo Kalakoski1Pekka T. Verronen2Daniel R. Marsh3Alexey Yu. Karpechko4Monika E. Szelag5Department of Physics, University of OtagoSpace and Earth Observation Centre, Finnish Meteorological InstituteSpace and Earth Observation Centre, Finnish Meteorological InstituteClimate and Global Dynamics, National Center for Atmospheric ResearchFinnish Meteorological InstituteSpace and Earth Observation Centre, Finnish Meteorological InstituteAbstract Solar driven energetic particle precipitation (EPP) is an important factor in polar atmospheric ozone balance and has been linked to ground-level regional climate variability. However, the linking mechanism has remained ambiguous. The observed and simulated ground-level changes start well before the processes from the main candidate, the so-called EPP-indirect effect, would start. Here we show that initial reduction of polar mesospheric ozone and the resulting change in atmospheric heating rapidly couples to dynamics, transferring the signal downwards, shifting the tropospheric jet polewards. This pathway is not constrained to the polar vortex. Rather, a subtropical route initiated by a changing wind shear plays a key role. Our results show that the signal propagates downwards in timescales consistent with observed tropospheric level climatic changes linked to EPP. This pathway, from mesospheric ozone to regional climate, is independent of the EPP-indirect effect, and solves the long-standing mechanism problem for EPP effects on climate.https://doi.org/10.1038/s41467-025-55966-z |
| spellingShingle | Annika Seppälä Niilo Kalakoski Pekka T. Verronen Daniel R. Marsh Alexey Yu. Karpechko Monika E. Szelag Polar mesospheric ozone loss initiates downward coupling of solar signal in the Northern Hemisphere Nature Communications |
| title | Polar mesospheric ozone loss initiates downward coupling of solar signal in the Northern Hemisphere |
| title_full | Polar mesospheric ozone loss initiates downward coupling of solar signal in the Northern Hemisphere |
| title_fullStr | Polar mesospheric ozone loss initiates downward coupling of solar signal in the Northern Hemisphere |
| title_full_unstemmed | Polar mesospheric ozone loss initiates downward coupling of solar signal in the Northern Hemisphere |
| title_short | Polar mesospheric ozone loss initiates downward coupling of solar signal in the Northern Hemisphere |
| title_sort | polar mesospheric ozone loss initiates downward coupling of solar signal in the northern hemisphere |
| url | https://doi.org/10.1038/s41467-025-55966-z |
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