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首页> 外文期刊>Paleoceanography >Lithium in the aragonite skeletons of massive Porites corals: A new tool to reconstruct tropical sea surface temperatures
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Lithium in the aragonite skeletons of massive Porites corals: A new tool to reconstruct tropical sea surface temperatures

机译：大量多孔珊瑚的文石骨架中的锂：重构热带海面温度的新工具

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Previous studies have demonstrated the potential for the Li content of coral aragonite to record information about environmental conditions, but no detailed study of tropical corals exists. Here we present the Li and Mg to Ca ratios at a bimonthly to monthly resolution over 25 years in two modern Porites corals, the genus most often used for paleoclimate reconstructions in the tropical Indo-Pacific. A strong relationship exists between coral Li/Ca and locally measured SST, indicating that coral Li/Ca can be used to reconstruct tropical SST variations. However, Li/Ca ratios of the skeleton deposited during 1979-1980 do not track local SST well and are anomalously high in places. The Mg/Ca ratios of this interval are also anomalously high, and we suggest Li/Ca can be used to reconstruct tropical SST only when Mg/Ca data are used to carefully screen for relatively rare biological effects. Mg/Li or Li/Mg ratios provide little advantage over Li/Ca ratios, except that the slope of the Li/Mg temperature relationship is more similar between the two corals. The Mg/Li temperature relationship for the coral that experienced a large temperature range is similar to that found for cold water corals and aragonitic benthic foraminifera in previous studies. The comparison with data from other biogenic aragonites suggests the relationship between Li/Mg and water temperature can be described by a single exponential relationship. Despite this hint at an overarching control, it is clear that biological processes strongly influence coral Li/Ca, and more calibration work is required before widely applying the proxy.
机译：先前的研究表明，珊瑚文石中Li的含量有可能记录有关环境条件的信息，但尚无关于热带珊瑚的详细研究。在这里，我们介绍了两种现代Porites珊瑚在25年中每两个月至一个月的分辨率下的Li和Mg与Ca的比率，这是热带印度太平洋最常用于古气候重建的属。珊瑚Li / Ca与当地测得的SST之间存在很强的关系，表明珊瑚Li / Ca可用于重建热带SST的变化。但是，1979-1980年沉积的骨骼中的Li / Ca比值不能很好地跟踪当地的SST，并且在某些地方异常高。该间隔的Mg / Ca比值也异常高，我们建议仅当使用Mg / Ca数据仔细筛选相对罕见的生物学效应时，才能使用Li / Ca来重建热带SST。 Mg / Li或Li / Mg的比率比Li / Ca的比率几乎没有优势，只是Li / Mg温度关系的斜率在两个珊瑚之间更相似。经历较大温度范围的珊瑚的Mg / Li温度关系与先前研究中发现的冷水珊瑚和古生物底栖有孔虫相似。与其他生物文石的数据进行的比较表明，Li / Mg与水温之间的关系可以用单指数关系来描述。尽管有总体控制的暗示，但很明显，生物过程会强烈影响珊瑚Li / Ca，在广泛应用替代物之前需要更多的校准工作。

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