Seawater pH reconstruction using boron isotopes in multiple planktonic foraminifera species with different depth habitats and their potential to constrain pH and pCO2 gradients
Department of Earth, Planetary, and Space Sciences, Department of
Atmospheric and Oceanic Sciences, Institute of the Environment and
Sustainability, UCLA, University of California – Los Angeles, Los Angeles,
CA 90095, USA
Laboratoire Géosciences Océan UMR6538, UBO, Institut
Universitaire Européen de la Mer, Rue Dumont d'Urville, 29280
Plouzané, France
Sambuddha Misra
Indian Institute of Science, Centre for Earth Sciences, Bengaluru,
Karnataka 560012, India
The Godwin Laboratory for Palaeoclimate Research, Department of
Earth Sciences, University of Cambridge, Cambridge, UK
Robert Eagle
Department of Earth, Planetary, and Space Sciences, Department of
Atmospheric and Oceanic Sciences, Institute of the Environment and
Sustainability, UCLA, University of California – Los Angeles, Los Angeles,
CA 90095, USA
Laboratoire Géosciences Océan UMR6538, UBO, Institut
Universitaire Européen de la Mer, Rue Dumont d'Urville, 29280
Plouzané, France
Alexandra Villa
Department of Earth, Planetary, and Space Sciences, Department of
Atmospheric and Oceanic Sciences, Institute of the Environment and
Sustainability, UCLA, University of California – Los Angeles, Los Angeles,
CA 90095, USA
Department of Geoscience, University of Wisconsin, Madison, WI
53706, USA
Department of Earth, Planetary, and Space Sciences, Department of
Atmospheric and Oceanic Sciences, Institute of the Environment and
Sustainability, UCLA, University of California – Los Angeles, Los Angeles,
CA 90095, USA
Laboratoire Géosciences Océan UMR6538, UBO, Institut
Universitaire Européen de la Mer, Rue Dumont d'Urville, 29280
Plouzané, France
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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.
Boron isotope ratios (δ11B) of foraminifera are a promising proxy for seawater pH and can be...
