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Title: Deep-sea coral δ13C: A tool to reconstruct the difference between seawater pH and δ11B-derived calcifying fluid pH
Authors: Martin, Patrick
Goodkin, Nathalie Fairbank
Stewart, Joseph A.
Foster, Gavin L.
Sikes, Elisabeth L.
White, Helen K.
Hennige, Sebastian
Roberts, J. Murray
Keywords: Biomineralization
Coral skeleton
Issue Date: 2015
Source: Martin, P., Goodkin, N. F., Stewart, J. A., Foster, G. L., Sikes, E. L., White, H. K., et al. (2015). Deep-sea coral δ13C: A tool to reconstruct the difference between seawater pH and δ11B-derived calcifying fluid pH. Geophysical Research Letters, 43(1), 299-308.
Series/Report no.: Geophysical Research Letters
Abstract: The boron isotopic composition (δ11B) of coral skeleton is a proxy for seawater pH. However, δ11B-based pH estimates must account for the pH difference between seawater and the coral calcifying fluid, ΔpH. We report that skeletal δ11B and ΔpH are related to the skeletal carbon isotopic composition (δ13C) in four genera of deep-sea corals collected across a natural pH range of 7.89–8.09, with ΔpH realated to δ13C by ΔpH=0.029 x δ13C + 0.929, r2=0.717. Seawater pH can be reconstructed by determining ΔpH from δ13C and subtracting it from the δ11B-derived calcifying fluid pH. The uncertainty for reconstructions is ±0.12 pH units (2 standard deviations) if estimated from regression prediction intervals or between ±0.04 and ±0.06 pH units if estimated from confidence intervals. Our new approach quantifies and corrects for vital effects, offering improved accuracy relative to an existing δ11B versus seawater pH calibration with deep-sea scleractinian corals.
ISSN: 0094-8276
DOI: 10.1002/2015GL066494
Rights: © 2015 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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