Extended Data Fig. 6: Replicate subsamples from a D. dianthus septum.
From: CO2 storage and release in the deep Southern Ocean on millennial to centennial timescales
To test for the potential influence of microstructural variability in composition, a coral septum was divided into four areas, which were then split into chunks of approximately 0.2, 0.8, 3.2 and 11 mg. These were then individually crushed, cleaned, and analysed. This sample treatment was designed to preserve heterogeneity between subsamples, although note that the clustering of subsamples of a given size from a certain area of the coral may lead to that group recording a slightly different signal (as seen in the 3.2 mg group). The lines in the middle panel show the mean and 2 s.d., excluding one outlier in the 11 mg group. δ11B is correlated with Mg/Ca and U/Ca, showing the influence of internal variability in coral composition.
