Statistics of anomalous events in the ozonosphere over Europe

Statistics of anomalous ozone over Europe is determined for the period of instrumental observations. The increased number of the Atlantic-type negative total ozone (TO) anomalies in the annual cycles over the last decades is confirmed. The frequency of the Arctic-type negative and positive TO anomalies has not virtually changed. The seasonal distribution of the relative frequency of anomalies of all types has not significantly changed. The seasonal distribution of the relative frequency of most intense Atlantic-type negative anomalies is “narrower” compared with the distribution of anomalies of average intensity. There are significant differences in the seasonal frequency distribution of mean and intense negative TO anomalies of the Arctic type.