Six temperature reconstructions for the Northern Hemisphere, three temperature reconstructions for the Southern Hemisphere, and two reconstructions of the volcanic activity covering time intervals from 980 to 2016 years were analyzed using the Fourier and wavelet techniques. It was shown that the volcanic activity varied with a period of 170–250 years since the mid-13th century. A similar periodicity is observed in variation of the Northern Hemisphere temperature. As shown by statistical analysis using the wavelet filtering, the correlation analysis, and the Fishers statistical approach, the probability that no relationship exists between the quasi-bicentennial temperature periodicity in the Northern Hemisphere after 1270 and the corresponding variations in the volcanic activity does not exceed 7.4×10. In the Southern Hemisphere, no evidence of the influence of quasi-bicentennial variations in volcanic activity on temperature was revealed. Possible reasons of the obtained results are discussed.
М. G. Ogurtdov (Wed,) studied this question.