Extended Data Fig. 8: Different Mg/Caseawater records influence sea surface temperatures but have only a modest impact on pH.
From: Pliocene decoupling of equatorial Pacific temperature and pH gradients
a, Various published Mg/CaSW reconstructions11,81,88,122 (lines) plotted alongside proxy-based estimates (orange points) from carbonate veins123,124 (orange triangle and diamond) and fluid inclusions82,83 (orange circle and square) with error reported in those studies (where there are error bars). b–d, Using different Mg/CaSW records only slightly affect SSTs and even less so pH results. b, SSTs calculated from T. sacculifer Mg/Ca data1 using the species-specific calibration of Dekens et al.125 and various Mg/CaSW reconstructions11,81,88,122. c, SSTs calculated from O. universa Mg/Ca data (this study) using the species-specific calibration of Anand et al.89 a and various Mg/CaSW reconstructions11,81,88,122. d, δ11B-derived pH (this study) using the various SST reconstructions in panel c. Note that the Mg/CaSW records of O’Brien et al.11 and Evans et al.122 (blue and purple lines in panel a) do note extend back far enough to apply to the ~6 Ma data, ending at ~4.8 Ma and ~5 Ma, respectively.
