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首页> 外文期刊>Paleoceanography >Reproducibility of geochemical and climatic signals in the Atlantic coral Montastraea faveolata
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Reproducibility of geochemical and climatic signals in the Atlantic coral Montastraea faveolata

机译：大西洋珊瑚Montastraea faveolata中地球化学和气候信号的可重复性

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[1] Monthly resolved, 41-year-long stable isotopic and elemental ratio time series were generated from two separate heads of Montastraea faveolata from Looe Key, Florida, to assess the fidelity of using geochemical variations in Montastraea, the dominant reef-building coral of the Atlantic, to reconstruct sea surface environmental conditions at this site. The stable isotope time series of the two corals replicate well; mean values of delta O-18 and delta C-13 are indistinguishable between cores ( compare 0.70 parts per thousand versus 0.68 parts per thousand for delta C-13 and - 3.90 parts per thousand versus - 3.94 parts per thousand for delta O-18). Mean values from the Sr/Ca time series differ by 0.037 mmol/mol, which is outside of analytical error and indicates that nonenvironmental factors are influencing the coral Sr/Ca records at Looe Key. We have generated significant delta O-18 - sea surface temperature (SST) (R = - 0.84) and Sr/Ca-SST (R = - 0.86) calibration equations at Looe Key; however, these equations are different from previously published equations for Montastraea. Variations in growth parameters or kinetic effects are not sufficient to explain either the observed differences in the mean offset between Sr/Ca time series or the disagreement between previous calibrations and our calculated delta O-18-SST and Sr/Ca-SST relationships. Calibration differences are most likely due to variations in seawater chemistry in the continentally influenced waters at Looe Key. Additional geochemical replication studies of Montastraea are needed and should include multiple coral heads from open ocean localities complemented whenever possible by seawater chemistry determinations.
机译：[1]来自佛罗里达州卢厄岛的两个独立的Montastraea faveolata头产生了每月解析的41年稳定同位素和元素比时间序列，以评估在主要的造礁珊瑚Montastraea中使用地球化学变异的保真度。重建大西洋的海面环境条件。两种珊瑚的稳定同位素时间序列可以很好地复制。核心之间的增量O-18和增量C-13的平均值是无法区分的（对于增量C-13，千分之0.70与千分之0.68，对于增量O-18，千分之3.90与千分之3.94比较） 。 Sr / Ca时间序列的平均值相差0.037 mmol / mol，这超出了分析误差，表明非环境因素正在影响Looe Key的珊瑚Sr / Ca记录。我们在Looe Key上生成了显着的O-18-海表温度（SST）（R =-0.84）和Sr / Ca-SST（R =-0.86）校准方程;但是，这些方程与以前发布的Montastraea方程不同。生长参数或动力学效应的变化不足以解释观察到的Sr / Ca时间序列之间的平均偏移差异，或者不足以解释先前的校准与我们计算出的O-18-SST和Sr / Ca-SST关系的差异。标定差异很可能是由于Looe Key受大陆影响的海水中海水化学成分的变化所致。还需要对Montastraea进行其他地球化学复制研究，并且应包括来自开放海洋地区的多个珊瑚头，并在可能的情况下通过海水化学测定加以补充。

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