Total Ozone Content over Tomsk in 1994–2017: Results of Statistical Analysis

Abstract

We present the long-term (1994–2017) M-124 ozonometer observations of the total ozone (TO) content over Tomsk. They were used to compile the annual behavior with the corresponding standard deviations. After annual oscillations were removed from the long-term (8766 points) time series, the TO variations were examined for a normality of the distribution. Next, the data obtained (also after being processed to remove the periodicity) were used to calculate the autocorrelation function. A harmonic, corresponding to the annual TO variations, is dominant in the Fourier spectrum. Semiannual oscillations with an-order-of-magnitude lower amplitude were also detected. However, the Fourier spectrum contained no quasi-biennial oscillations, quite often mentioned in the literature. They were extracted using simpler methods of statistical analysis.