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Earth, Planets and Space
Figure 3 | Earth, Planets and Space

Figure 3

From: Regional climate pattern during two millennia estimated from annual tree rings of Yaku cedar trees: a hint for solar variability?

Figure 3

Results of wavelet analysis of annual tree rings of Yakusugi for 3-year average dataset. The 11-year and (24 ± 4)-year periodicities are apparent between 1100 and 1900. The vertical axis represents the inverse of the periodicity. The periodicities are seen in the pair of 11-year and the (24 ± 4)-year periodicities and enhanced during the five grand minima. Arrows correspond to each maximum year of C 14; from left to right: Oort, Wolf, Spörer, Maunder, and Dalton minima, indicated by arrows in the graph marked O, W, S, M, and D, respectively. The periodicities observed around 320 CE, 400 CE, 630 CE, and 820 CE may be related to the change in global climate, since each duration coincides with the extension time of Swiss glaciers.

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