Extended Data Fig. 5: NGT-2012 and Arctic 2k point correlation with the Twentieth Century Reanalysis v3 (20CRv3) near-surface temperature field.
From: Modern temperatures in central–north Greenland warmest in past millennium
a, Point correlation between the 20CRv3 reanalysis field23,24 of annual mean near-surface temperatures and the NGT-2012 annual mean δ18O temperature reconstruction time series. b, As in a but for the point correlation with the Arctic 2k annual mean temperature reconstruction time series. c, As in a but for the point correlation with the 20CRv3 reanalysis temperature area mean of the Greenland region. d, As in a but for the point correlation with the 20CRv3 reanalysis temperature area mean of the Arctic region (60–90° N). Correlations are calculated for the time period 1836–2000 (a,b) or 1836–2015 (c,d) for all reanalysis grid cells ≥50° N. Grid cells filled grey mark areas with nonsignificant correlation values (P > 0.05; n = 165 in a,b; n = 180 in c,d). All geographic map data are obtained from the ‘rnaturalearth’ package for the software R.
