It has been recently shown that B/Ca in planktonic foraminiferal calcite can be used as a proxy for seawater pH. Based on the study of surface sediments (multi-cores) retrieved along a depth transect on the Sierra Leone Rise (Eastern Equatorial Atlantic), we document the decrease of B/Ca and Mg/Ca of Globigerinoides sacculifer shells with increasing water depth and dissolution. This effect of dissolution on B/Ca may potentially represent a severe bias for paleo-pH reconstructions using this species. Samples of G. sacculifer were analyzed independently at two laboratories for B/Ca and Mg/Ca. Both sets of results show a systematic decrease of B/Ca and Mg/Ca along the depth transect, with an overall loss of ∼14 µmol/mol (∼15%) for B/Ca and of ∼0.7 mmol/mol (∼21%) for Mg/Ca between the shallowest (2640 m) and the deepest (4950 m) sites. Because of this dissolution effect, surface water pH reconstructed from B/Ca of G. sacculifer decreases by ∼0.11 units between the shallowest site and the deepest site, a magnitude similar to the expected glacial/interglacial surface water pH changes.
Coadic R., Bassinot F., Dissard D., Douville E., Greaves M. & Michel E., in press. A core-top study of dissolution effect on B/Ca in Globigerinoides sacculifer from the tropical Atlantic: potential bias for paleo-reconstruction of seawater carbonate chemistry. Geochemistry, Geophysics, Geosystems. Article (subscription required).