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Polar mesospheric ozone loss initiates downward coupling of solar signal in the Northern Hemisphere

Author

Listed:
  • Annika Seppälä

    (University of Otago)

  • Niilo Kalakoski

    (Finnish Meteorological Institute)

  • Pekka T. Verronen

    (Finnish Meteorological Institute
    University of Oulu)

  • Daniel R. Marsh

    (National Center for Atmospheric Research
    University of Leeds)

  • Alexey Yu. Karpechko

    (Finnish Meteorological Institute)

  • Monika E. Szelag

    (Finnish Meteorological Institute)

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.

Suggested Citation

  • Annika Seppälä & Niilo Kalakoski & Pekka T. Verronen & Daniel R. Marsh & Alexey Yu. Karpechko & Monika E. Szelag, 2025. "Polar mesospheric ozone loss initiates downward coupling of solar signal in the Northern Hemisphere," Nature Communications, Nature, vol. 16(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-55966-z
    DOI: 10.1038/s41467-025-55966-z
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    References listed on IDEAS

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