Fig. 3.

Temperature reconstructions from the DF2 core together with the CO₂ record. a The upper panel shows the DF δD (black) and ΔT_site (red) records and the CO₂ composite record³² (green), as well as the residuals from a linear regression between δD and CO₂ (orange) and obliquity (black). The lower panel shows DF ΔT_source (blue) and the CO₂ composite record (green). DF ΔT_grad (purple) with obliquity (black) is shown at the bottom. The δD (or ΔT_source) axis was scaled to fit a linear regression between δD (or ΔT_source) and CO₂. Numbers indicate Marine Isotope Stages. b Power spectra of Earth’s obliquity (black) and DF ΔT_grad (purple), DF δD (black dotted), ΔT_site (red), ΔT_source (blue) and the CO₂ composite record³² (green). c Upper panel: coherence of δD vs. CO₂ (black dotted), ΔT_site vs. CO₂ (red) and ΔT_source vs. CO₂ (blue). Lower panel: same as upper panel but for phase lag. Red and blue colours indicate uncertainty ranges (Methods). The uncertainty range of CO₂ vs. δD is similar to that of CO₂ vs. ΔT_site; however, it is not shown here for clarity. The obliquity band is shown in yellow