The Long-Term Regime of Atmospheric Precipitation in Irkutsk
The paper studies the time series of monthly and annual amounts of atmo-sphere precipitation in Irkutsk for the 130-year period (1887–2016 years) with the help of calculated coefficients of asymmetry, process, the slope of the linear trend, the stability of which was determined by the coefficient of determination (R2), which shows the contribution of the trend to precipitation variance. The linear trends of precipitation amounts showed a steady trend of positive deviations in all months of the year, but the significance of the coefficients is low. More pronounced cyclical fluctuations, identified on the basis of spectral analysis. In the long-term dynamics of annual precipitation amounts, the quasi-annual dynamics and longer cycles, lasting about 30 and 60 years, which can reflect the contribution of large-scale circulation factors in the multiple-holographic regime of humidification of the territory. The degree of correlation between the North Atlantic Oscillation (NAO), the Pacific Decadal Oscillation (PDO), the SOI South Oscillation Index and the summer precipitation in Irkutsk in the period 2000–2017 years significantly increased compared with the earlier period of the study (1887–1999 years). The contribution of the latter reflects well the abnormally high amount of precipitation (319% of the norm), which was released in Irkutsk in December 2017 year.
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