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Earth, Planets and Space
Figure 4 | Earth, Planets and Space

Figure 4

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

Figure 4

Results of Fourier analysis of dr variation. Analysis was performed for annual tree rings between 1360 and 1988. Dataset without a running average was used. Red line indicates amplitude spectrum for the MC-generated dr data that were randomly produced. Compared to red line, amplitude at 11-year and 22-year periods exceed 3.1 σ and 2.7 σ, respectively.

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