Fig. 3: Model-data comparison.
From: Ocean acidification at the Toarcian Anoxic Event captured by boron isotopes in the lime mud record
a Compares the measured δ13C data (yellow diamond14) with the model’s estimate for the surface ocean carbonate carbon burial flux (solid blue line). b Compares the measured δ11B values (micrite and brachiopods) with model estimates of the seawater average (solid blue line) and that associated with marine carbonate (solid purple line). c–f Compare the pH estimates derived from direct proxy inversion (symbols) with the model estimate for surface seawater pH (solid black line). Black and white circles show micrite pH data (c using the Klochko et al.64 formula), other symbols and shades show brachiopod data (d-f equations are from Lécuyer et al.34, Penman et al.35 and Jurikova et al.33). Proxy inversion estimates are a function of the model pKB estimate (dashed black line), with the exception of that of Lécuyer et al.34, for which it was held constant at pKB = 8.9 (Supplementary Method).
