Sr/Ca-Sea surface temperature calibration in the branching Caribbean coral Acropora palmata

Christina D Gallup; Donna M. Olson; Larry Edwards; Leah M. Gruhn; Amos Winter; Frederick W. Taylor

doi:10.1029/2005GL024935

Sr/Ca-Sea surface temperature calibration in the branching Caribbean coral Acropora palmata

Christina D Gallup, Donna M. Olson, Larry Edwards, Leah M. Gruhn, Amos Winter, Frederick W. Taylor

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

We measured Sr/Ca ratios by thermal ionization mass spectrometry in radial and axial growth of modern Caribbean Acropora palmata corals. Comparison of our results with sea surface temperature (SST) allows radial and axial Sr/Ca-SST calibrations of Sr/Ca (mmol/mol) = 11.30 - 0.07072 × SST (°C) and Sr/Ca (mmol/mol) = 11.32 - 0.06281 × SST (°C), respectively. Application of the calibrations to fossil Acropora palmata from the last glacial maximum in Barbados (Guilderson et al., 1994) imply ∼7°C cooler conditions than the present, much larger than the 1-1.5° cooling suggested by modern analog technique foraminifera-based estimates (Trend-Staid and Prell, 2002). If the foraminifera-based estimates are correct, then the excess cooling suggested by the Barbados corals could be explained by a 5% shift in the marine Sr/Ca ratio or an addition of ∼20% abiotic secondary aragonite.

Original language	English (US)
Article number	L03606
Journal	Geophysical Research Letters
Volume	33
Issue number	3
DOIs	https://doi.org/10.1029/2005GL024935
State	Published - Feb 16 2006

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@article{7e41300bfc3e4476adfaeb131ddffbb5,

title = "Sr/Ca-Sea surface temperature calibration in the branching Caribbean coral Acropora palmata",

abstract = "We measured Sr/Ca ratios by thermal ionization mass spectrometry in radial and axial growth of modern Caribbean Acropora palmata corals. Comparison of our results with sea surface temperature (SST) allows radial and axial Sr/Ca-SST calibrations of Sr/Ca (mmol/mol) = 11.30 - 0.07072 × SST (°C) and Sr/Ca (mmol/mol) = 11.32 - 0.06281 × SST (°C), respectively. Application of the calibrations to fossil Acropora palmata from the last glacial maximum in Barbados (Guilderson et al., 1994) imply ∼7°C cooler conditions than the present, much larger than the 1-1.5° cooling suggested by modern analog technique foraminifera-based estimates (Trend-Staid and Prell, 2002). If the foraminifera-based estimates are correct, then the excess cooling suggested by the Barbados corals could be explained by a 5% shift in the marine Sr/Ca ratio or an addition of ∼20% abiotic secondary aragonite.",

author = "Gallup, {Christina D} and Olson, {Donna M.} and Larry Edwards and Gruhn, {Leah M.} and Amos Winter and Taylor, {Frederick W.}",

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AU - Gallup, Christina D

AU - Olson, Donna M.

AU - Edwards, Larry

AU - Gruhn, Leah M.

AU - Winter, Amos

AU - Taylor, Frederick W.

PY - 2006/2/16

Y1 - 2006/2/16

N2 - We measured Sr/Ca ratios by thermal ionization mass spectrometry in radial and axial growth of modern Caribbean Acropora palmata corals. Comparison of our results with sea surface temperature (SST) allows radial and axial Sr/Ca-SST calibrations of Sr/Ca (mmol/mol) = 11.30 - 0.07072 × SST (°C) and Sr/Ca (mmol/mol) = 11.32 - 0.06281 × SST (°C), respectively. Application of the calibrations to fossil Acropora palmata from the last glacial maximum in Barbados (Guilderson et al., 1994) imply ∼7°C cooler conditions than the present, much larger than the 1-1.5° cooling suggested by modern analog technique foraminifera-based estimates (Trend-Staid and Prell, 2002). If the foraminifera-based estimates are correct, then the excess cooling suggested by the Barbados corals could be explained by a 5% shift in the marine Sr/Ca ratio or an addition of ∼20% abiotic secondary aragonite.

AB - We measured Sr/Ca ratios by thermal ionization mass spectrometry in radial and axial growth of modern Caribbean Acropora palmata corals. Comparison of our results with sea surface temperature (SST) allows radial and axial Sr/Ca-SST calibrations of Sr/Ca (mmol/mol) = 11.30 - 0.07072 × SST (°C) and Sr/Ca (mmol/mol) = 11.32 - 0.06281 × SST (°C), respectively. Application of the calibrations to fossil Acropora palmata from the last glacial maximum in Barbados (Guilderson et al., 1994) imply ∼7°C cooler conditions than the present, much larger than the 1-1.5° cooling suggested by modern analog technique foraminifera-based estimates (Trend-Staid and Prell, 2002). If the foraminifera-based estimates are correct, then the excess cooling suggested by the Barbados corals could be explained by a 5% shift in the marine Sr/Ca ratio or an addition of ∼20% abiotic secondary aragonite.

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