Surface Temperature Variations and Solar Activity

We shall consider a connection of surface air temperature variations with variations of solar activity with periods more than 11 years from 1925 up to 2000. Wolf numbers W, as parameter of solar activity are considered in this study. The deviations of these values from mean-periodical values are analyzed. Figure 15.1a-c shows the variations of deviations of the solar activity secular component AW - (a) and surface temperature deviations AT for a cold half year according to data of Bishkek meteorological station - (b), from which the 11-year component and a component averaged on all stations of the Northern hemisphere - (c) were excluded [7]. One can see in the figure the good correlation between these values (correlation coefficient k=0.75), and that the maximums in large-scale variations of surface temperature are marked in a period of 2-3 years after solar maximums.

Next, the calculations of time temperature series frequency spectra were made using data of Bishkek, Cholpon-Ata, Naryn, and Tien-Shan meteorological stations. Frequency components were selected with confidence probability level P > 0.87, corresponding to periods 5.0-5.5; 11-12; 21-23; 49-52; 85-95 years. The same periodicities are available in solar activity variations frequency spectra. These results testify statistical connection of surface temperature variations at middle and high altitudes of Kyrgyzstan with solar activity variations.

Groundwater Temperature Winter
Fig. 15.1 Variations of deviations of the solar activity secular component in Wolf numbers, AW100 - (a), surface atmosphere temperature anomalies, AT, in winter, according to meteorological station Bishkek - (b) and all stations of the Northern Hemisphere - (c)

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