Fig. 2: Validation of reconstructed GMT time series with the instrumental reanalyses for the period 1880-2000.

Comparisons between temperature reconstructions using PAGES2k (a), PAGES2k + M08 (b), and the comprehensive database (c) and instrumental reanalyses for the period 1880–2000. The correlation coefficients from OEnKF are in blue, and correlation coefficients from HGOEnKF are in black.