Fig. 3: Schematic of the proposed Mg-SST proxy mechanisms.
From: The Gulf Stream moved northward at the end of the Little Ice Age
a Observational wind speed data (red) plotted against observational SST data (blue)31. b Mg in collected rainwater (magenta)89 plotted against the observational SST data in (a). c BER-SWI-13 Mg concentrations (gold) shown against Bermudan SSTs reconstructed from a coral (green)21. d BER-SWI-13 Mg concentrations (gold) shown against the observational SST data in (a). Stalagmite Mg cyclicity is not directly compared to wind speed or rainwater Mg variability due to potential anthropogenic impacts on the Mg record post-1961 and wind speed and rainwater observations beginning in 1975 and 1989, respectively. Note that the stalagmite Mg and wind speed axes are inverted and that the bold italics in the schematic denote source concentrations (i.e., ocean water is Mg-rich and rainwater has comparatively low Mg concentrations).
