Articles | Volume 17, issue 13
https://doi.org/10.5194/bg-17-3487-2020
https://doi.org/10.5194/bg-17-3487-2020
Research article
 | 
08 Jul 2020
Research article |  | 08 Jul 2020

Seawater pH reconstruction using boron isotopes in multiple planktonic foraminifera species with different depth habitats and their potential to constrain pH and pCO2 gradients

Maxence Guillermic, Sambuddha Misra, Robert Eagle, Alexandra Villa, Fengming Chang, and Aradhna Tripati

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Cited articles

Allen, K. A. and Hönisch, B.: The planktic foraminiferal B∕Ca proxy for seawater carbonate chemistry, A critical evaluation, Earth Planet. Sc. Lett., 345, 203–211, 2012. 
Anderson, O. R. and Bé, A.W. H.: The ultrastructure of a planktonic foraminifer, Globigerinoides sacculifer (Brady), and its symbiotic dinoflagellates, J. Foramin. Res., 6, 1–21, 1976. 
Babila, T. L., Rosenthal, Y., and Conte, M. H.: Evaluation of the biogeochemical controls on B∕Ca of Globigerinoides ruber white from the Oceanic Flux Pro-gram, Bermuda, Earth Planet. Sc. Lett., 404, 67–76, 2014. 
Barker, S., Greaves, M., and Elderfield, H.: A study of cleaning procedures used for foraminiferal Mg∕Ca paleothermometry, Geochem. Geophy. Geosy., 4, 1–20, 2003. 
Bartoli, G., Hönisch, B., and Zeebe, R. E.: Atmospheric CO2 decline during the Pliocene intensification of Northern Hemisphere glaciations, Paleoceanography 26, 1–14, 2011. 
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Short summary
Boron isotope ratios (δ11B) of foraminifera are a promising proxy for seawater pH and can be used to constrain pCO2. In this study, we derived calibrations for new foraminiferal taxa which extend the application of the boron isotope proxy. We discuss the origin of different δ11B signatures in species and also discuss the potential of using multispecies δ11B analyses to constrain vertical pH and pCO2 gradients in ancient water columns to shed light on biogeochemical carbon cycling in the past.
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