Large decadal scale changes of polar ozone suggest solar influence
- 1Institute of Environmental Physics, University of Bremen, Bremen, Germany
- 2Alfred-Wegener-Institute for Polar and Marine Research, Research Unit Potsdam, Potsdam, Germany
- 3Alfred-Wegener-Institute for Polar and Marine Research, Bremerhaven, Germany
- 4NOAA Climate Monitoring and Diagnostics Laboratory, Boulder, Colorado, USA
Abstract. Long-term measurements of polar ozone show an unexpectedly large decadal scale variability in the mid-stratosphere during winter. Negative ozone anomalies are strongly correlated with the flux of energetic electrons in the radiation belt, which is modulated by the 11-year solar cycle. The magnitude of the observed decadal ozone changes (≈20%) is much larger than any previously reported solar cycle effect in the atmosphere up to this altitude. The early-winter ozone anomalies subsequently propagate downward into the lower stratosphere and may even influence total ozone and meteorological conditions during spring. These findings suggest a previously unrecognized mechanism by which solar variability impacts on climate through changes in polar ozone.