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Deep-sea coral 13C: A tool to reconstruct the difference between seawater pH and?11B-derived calcifying fluid pH

Deep-sea coral 13C: A tool to reconstruct the difference between seawater pH and?11B-derived calcifying fluid pH
Deep-sea coral 13C: A tool to reconstruct the difference between seawater pH and?11B-derived calcifying fluid pH
The boron isotopic composition (?11B) of coral skeleton is a proxy for seawater pH. However, ?11B-based pH estimates must account for the pH difference between seawater and the coral calcifying fluid, ?pH. We report that skeletal ?11B and ?pH are related to the skeletal carbon isotopic composition (?13C) in four genera of deep-sea corals collected across a natural pH range of 7.89–8.09, with ?pH related to ?13C by ?pH?=?0.029?×??13C?+?0.929, r2?=?0.717. Seawater pH can be reconstructed by determining ?pH from ?13C and subtracting it from the ?11B-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 ?11B versus seawater pH calibration with deep-sea scleractinian corals.
boron isotopes, carbon isotopes, coral skeleton, coral calcification
0094-8276
299-308
Martin, Patrick
ce9f52ad-2241-4ae1-b67a-2772a7b07556
Goodkin, Nathalie F.
491356b9-5eb7-445b-ae67-63dccd64d71b
Stewart, Joseph A.
69894bea-c03d-44a9-8f12-ff55580c6009
Foster, Gavin L.
fbaa7255-7267-4443-a55e-e2a791213022
Sikes, Elisabeth L.
5ed0e512-2e00-4c1d-96ec-20e53e158eca
White, Helen K.
5525f09c-ac8d-44aa-af98-cb6fb4cdf127
Hennige, Sebastian
a1d11555-55fa-493a-9429-0cdff640d1eb
Roberts, J. Murray
f254ac2d-38cd-44e4-b625-279eab5e06f2
Martin, Patrick
ce9f52ad-2241-4ae1-b67a-2772a7b07556
Goodkin, Nathalie F.
491356b9-5eb7-445b-ae67-63dccd64d71b
Stewart, Joseph A.
69894bea-c03d-44a9-8f12-ff55580c6009
Foster, Gavin L.
fbaa7255-7267-4443-a55e-e2a791213022
Sikes, Elisabeth L.
5ed0e512-2e00-4c1d-96ec-20e53e158eca
White, Helen K.
5525f09c-ac8d-44aa-af98-cb6fb4cdf127
Hennige, Sebastian
a1d11555-55fa-493a-9429-0cdff640d1eb
Roberts, J. Murray
f254ac2d-38cd-44e4-b625-279eab5e06f2

Martin, Patrick, Goodkin, Nathalie F., Stewart, Joseph A., Foster, Gavin L., Sikes, Elisabeth L., White, Helen K., Hennige, Sebastian and Roberts, J. Murray (2016) Deep-sea coral 13C: A tool to reconstruct the difference between seawater pH and?11B-derived calcifying fluid pH. Geophysical Research Letters, 43 (1), 299-308. (doi:10.1002/2015GL066494).

Record type: Article

Abstract

The boron isotopic composition (?11B) of coral skeleton is a proxy for seawater pH. However, ?11B-based pH estimates must account for the pH difference between seawater and the coral calcifying fluid, ?pH. We report that skeletal ?11B and ?pH are related to the skeletal carbon isotopic composition (?13C) in four genera of deep-sea corals collected across a natural pH range of 7.89–8.09, with ?pH related to ?13C by ?pH?=?0.029?×??13C?+?0.929, r2?=?0.717. Seawater pH can be reconstructed by determining ?pH from ?13C and subtracting it from the ?11B-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 ?11B versus seawater pH calibration with deep-sea scleractinian corals.

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Accepted/In Press date: 12 November 2015
Published date: 11 January 2016
Keywords: boron isotopes, carbon isotopes, coral skeleton, coral calcification
Organisations: Geochemistry

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Local EPrints ID: 390968
URI: https://eprints.soton.ac.uk/id/eprint/390968
ISSN: 0094-8276
PURE UUID: 5a2daf7d-bef0-4c5e-808e-6a7e17141556
ORCID for Gavin L. Foster: ORCID iD orcid.org/0000-0003-3688-9668

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Date deposited: 07 Apr 2016 10:52
Last modified: 15 Aug 2019 00:39

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Contributors

Author: Patrick Martin
Author: Nathalie F. Goodkin
Author: Joseph A. Stewart
Author: Gavin L. Foster ORCID iD
Author: Elisabeth L. Sikes
Author: Helen K. White
Author: Sebastian Hennige
Author: J. Murray Roberts

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