Publication detail

Kristoufek, L.: Has global warming modified the relationship between sunspot numbers and global temperatures?

Author(s): prof. PhDr. Ladislav Krištoufek Ph.D.,
Type: Articles in journals with impact factor
Year: 2017
Number: 0
ISSN / ISBN:
Published in: Physica A: Statistical Mechanics and Its Applications 468, pp. 351-358 arXiv PDF
Publishing place:
Keywords: sunspot numbers, global temperatures, global warming, wavelet coherence, $CO_2$ emissions
JEL codes:
Suggested Citation:
Abstract: We study time evolution of the relationship between sunspot numbers and global temperatures between 1880 and 2016 using wavelet coherence framework. The results suggest that the relationship is stable in time. Changes in the sunspot numbers precede changes in the temperatures by more than two years as suggested by the wavelet phase differences. This leading position of the sun activity is stable in time as well. However, the relationship has been disturbed by increasing $CO_2$ emissions since 1960s. Without controlling for the effect of possible global warming, or more precisely the positive connection between increasing $CO_2$ emissions and the global temperatures, the findings would have been quite different. Combination of the cointegration analysis and wavelet coherence framework has enabled uncovering a hidden relationship between the solar activity and global temperatures, and possibly explaining equivocal results in the topical literature.
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