Table 4 Spearman’s rank correlation coefficients from the preformed linear regression models between proxy-based NAO reconstructions and Sunspot Number reconstruction. Decades with large volcanic eruptions have been removed from the analysis. In bold, significant correlation values at 0.01 significance. Note that NAO_TRO from Morocco (in italics) is included to highlight the solar activity impact in lower latitudes.

From: A 2,000-year Bayesian NAO reconstruction from the Iberian Peninsula