Fig. 4: Golgotha Cave speleothem δ18O records.
From: Ubiquitous karst hydrological control on speleothem oxygen isotope variability in a global study
a Speleothem records GL-S1 (red), GL-S2 (green), GL-S3 (navy blue) and GL-S4 (purple) for the last 800 years. b Comparison between speleothem (solid line), dripwater (dashed line) and farmed calcite (squares) for the last four decades. Dashed box in a indicates region re-plotted in b. Dripwaters were converted to calcite equivalent values using an empirical bulk fractionation factor derived from calcites farmed at the drip sites (Supplementary Note 1 and Table 1). Dripwater (calcite equivalent δ18O values) are used to extend the speleothem time series. The agreement (allowing for the rising trend) also supports the empirical fractionation factor calculated from Golgotha farmed calcites and dripwaters.
