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A multilinear parametric regression analysis was performed to assess the\udseasonal and interannual variations of stratospheric ozone profiles from the\udGROMOS (GROund-based Millimeter-wave Ozone Spectrometer) microwave radiometer\udat Bern, Switzerland (46.95° N, 7.44° E; 577 m). GROMOS\udtakes part in the Network for the Detection of Atmospheric Composition Change\ud(NDACC). The study covers the stratosphere from 50 to 0.5 hPa (from 21 to\ud53 km) and extends over the period from January 1997 to January 2015. The\udnatural variability was fitted during the regression analysis through the\udannual and semi-annual oscillations (AO, SAO), the quasi-biennial oscillation\ud(QBO), the El Niño–Southern Oscillation (ENSO) and the solar activity\udcycle. Seasonal ozone variations mainly appear as an annual cycle in the\udmiddle and upper stratosphere and a semi-annual cycle in the upper\udstratosphere. Regarding the interannual variations, they are primarily\udpresent in the lower and middle stratosphere. In the lower and middle\udstratosphere, ozone variations are controlled predominantly by transport\udprocesses, due to the long lifetime of ozone, whereas in the upper\udstratosphere its lifetime is relatively short and ozone is controlled mainly\udby photochemistry. The present study shows agreement in the observed\udnaturally induced ozone signatures with other studies. Further, we present an\udoverview of the possible causes of the effects observed in stratospheric\udozone due to natural oscillations at a northern midlatitude station. For\udinstance regarding the SAO, we find that polar winter stratopause warmings\udcontribute to the strength of this oscillation since these temperature\udenhancements lead to a reduction in upper stratospheric ozone. We have\uddetected a strong peak amplitude of about 5 % for the solar cycle in lower\udstratospheric ozone for our 1.5 cycles of solar activity. Though the 11-year\udozone oscillation above Bern is in phase with the solar cycle, we suppose\udthat the strong amplitude is partly due to meteorological disturbances and\udassociated ozone anomalies in the Northern Hemisphere. Further, our\udobservational study gave the result that ozone above Bern is anti-correlated\udwith the ENSO phenomenon in the lower stratosphere and correlated in the\udmiddle stratosphere

The natural oscillations in stratospheric ozone observed by the GROMOS microwave radiometer at the NDACC station Bern