TY - JOUR
T1 - Seawater temperature proxies based on DSr, DMg, and DU from culture experiments using the branching coral Porites cylindrica
AU - Armid, Alrum
AU - Asami, Ryuji
AU - Fahmiati, Tanri
AU - Sheikh, Mohammed Ali
AU - Fujimura, Hiroyuki
AU - Higuchi, Tomihiko
AU - Taira, Eiko
AU - Shinjo, Ryuichi
AU - Oomori, Tamotsu
N1 - Funding Information:
We thank the staff of the Okinawa Environmental Research and Technology Center for the use of ICP-MS and the staff of the Instrumental Research Center (University of the Ryukyus) for the use of ICP-AES. We also thank Anders Meibom and four anonymous reviewers for very constructive comments on this manuscript. This work was supported by a Grant-in Aid from the Japan Society for the Promotion of Science Research Funds Nos. 17201006 , 20310014 , and 20398308 and by the Rising Star Program for Subtropical Island Sciences, University of the Ryukyus .
PY - 2011/8/1
Y1 - 2011/8/1
N2 - In order to investigate the incorporation of Sr, Mg, and U into coral skeletons and its temperature dependency, we performed a culture experiment in which specimens of the branching coral (Porites cylindrica) were grown for 1month at three seawater temperatures (22, 26, and 30°C). The results of this study showed that the linear extension rate of P. cylindrica has little effect on the skeletal Sr/Ca, Mg/Ca, and U/Ca ratios. The following temperature equations were derived: Sr/Ca (mmol/mol)=10.214(±0.229)-0.0642(±0.00897)×T (°C) (r2=0.59, p<0.05); Mg/Ca (mmol/mol)=1.973(±0.302)+0.1002(±0.0118)×T (°C) (r2=0.67, p<0.05); and U/Ca (μmol/mol)=1.488(±0.0484)-0.0212(±0.00189)×T (°C) (r2=0.78, p<0.05). We calculated the distribution coefficient (D) of Sr, Mg, and U relative to seawater temperature and compared the results with previous data from massive Porites corals. The seawater temperature proxies based on D calibrations of P. cylindrica established in this study are generally similar to those for massive Porites corals, despite a difference in the slope of DU calibration. The calibration sensitivity of DSr, DMg, and DU to seawater temperature change during the experiment was 0.64%/°C, 1.93%/°C, and 1.97%/°C, respectively. These results suggest that the skeletal Sr/Ca ratio (and possibly the Mg/Ca and/or U/Ca ratio) of the branching coral P. cylindrica can be used as a potential paleothermometer.
AB - In order to investigate the incorporation of Sr, Mg, and U into coral skeletons and its temperature dependency, we performed a culture experiment in which specimens of the branching coral (Porites cylindrica) were grown for 1month at three seawater temperatures (22, 26, and 30°C). The results of this study showed that the linear extension rate of P. cylindrica has little effect on the skeletal Sr/Ca, Mg/Ca, and U/Ca ratios. The following temperature equations were derived: Sr/Ca (mmol/mol)=10.214(±0.229)-0.0642(±0.00897)×T (°C) (r2=0.59, p<0.05); Mg/Ca (mmol/mol)=1.973(±0.302)+0.1002(±0.0118)×T (°C) (r2=0.67, p<0.05); and U/Ca (μmol/mol)=1.488(±0.0484)-0.0212(±0.00189)×T (°C) (r2=0.78, p<0.05). We calculated the distribution coefficient (D) of Sr, Mg, and U relative to seawater temperature and compared the results with previous data from massive Porites corals. The seawater temperature proxies based on D calibrations of P. cylindrica established in this study are generally similar to those for massive Porites corals, despite a difference in the slope of DU calibration. The calibration sensitivity of DSr, DMg, and DU to seawater temperature change during the experiment was 0.64%/°C, 1.93%/°C, and 1.97%/°C, respectively. These results suggest that the skeletal Sr/Ca ratio (and possibly the Mg/Ca and/or U/Ca ratio) of the branching coral P. cylindrica can be used as a potential paleothermometer.
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U2 - 10.1016/j.gca.2011.05.010
DO - 10.1016/j.gca.2011.05.010
M3 - Article
AN - SCOPUS:79959686253
VL - 75
SP - 4273
EP - 4285
JO - Geochmica et Cosmochimica Acta
JF - Geochmica et Cosmochimica Acta
SN - 0016-7037
IS - 15
ER -