Coral carbon isotope sensitivity to growth rate and water depth with paleo-sea level implications

Braddock K. Linsley (), Robert B. Dunbar, Emilie P. Dassié, Neil Tangri, Henry C. Wu, Logan D. Brenner and Gerard M. Wellington
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Braddock K. Linsley: Lamont-Doherty Earth Observatory of Columbia University
Robert B. Dunbar: Stanford University
Emilie P. Dassié: Lamont-Doherty Earth Observatory of Columbia University
Neil Tangri: Stanford University
Henry C. Wu: Leibniz Centre for Tropical Marine Research (ZMT) GmbH
Logan D. Brenner: Lamont-Doherty Earth Observatory of Columbia University
Gerard M. Wellington: University of Houston

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Although reef coral skeletal carbon isotopes (δ13C) are routinely measured, interpretation remains controversial. Here we show results of a consistent inverse relationship between coral δ13C and skeletal extension rate over the last several centuries in Porites corals at Fiji, Tonga, Rarotonga and American Samoa in the southwest Pacific. Beginning in the 1950s, this relationship breaks down as the atmospheric 13C Suess effect shifts skeletal δ13C > 1.0‰ lower. We also compiled coral δ13C from a global array of sites and find that mean coral δ13C decreases by −1.4‰ for every 5 m increase in water depth (R = 0.68, p

Date: 2019
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DOI: 10.1038/s41467-019-10054-x

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