Figure 2: Palaeoceanography of the Eastern Equatorial Pacific during the last 22 ky.

(a) Changes in SST based on the Mg/Ca composition of G. ruber (orange line and yellow squares) using thermometer calibration from Anand et al.⁴⁰ (b) Temperatures of subsurface waters based on the Mg/Ca composition of N. dutertrei (blue squares) using thermometer calibration from Anand et al.⁴⁰ Blue diamonds represent temperature variability of subsurface waters calculated from repetitive Mg/Ca measurements of N. dutertrei samples, each comprising two shells. Spread of these Mg/Ca values is shaded by light blue background. (c) N. dutertrei δ¹⁸O down-core record (red squares) and δ¹⁸O variability based on repetitive measurements of N. dutertrei samples, each comprising two (red diamonds) to three shells (orange diamonds). Spread of these δ¹⁸O values is shaded by a pink red background. (d) N. dutertrei δ¹³C down-core record (black squares) and δ¹³C variability based on repetitive measurements of N. dutertrei samples, each comprising two (white diamonds) to three shells (grey diamonds). Spread of these δ¹³C values is shaded by a light grey background. Grey triangles mark samples used for AMS ¹⁴C dating. Thick grey lines denote 410 years running average extrapolated for each record.