TY - JOUR
T1 - Sr/Ca-Sea surface temperature calibration in the branching Caribbean coral Acropora palmata
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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U2 - 10.1029/2005GL024935
DO - 10.1029/2005GL024935
M3 - Article
AN - SCOPUS:33645817228
SN - 0094-8276
VL - 33
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 3
M1 - L03606
ER -