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首页> 外文期刊>Paleoceanography >Mg/Ca-temperature proxy in benthic foraminifera: New calibrations from the Florida Straits and a hypothesis regarding Mg/Li
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Mg/Ca-temperature proxy in benthic foraminifera: New calibrations from the Florida Straits and a hypothesis regarding Mg/Li

机译：底栖有孔虫中的镁/钙温度代用品：来自佛罗里达海峡的新定标以及关于镁/锂的假设

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[1] Over the past decade, the ratio of Mg to Ca in foraminiferal tests has emerged as a valuable paleotemperature proxy. However, large uncertainties remain in the relationships between benthic foraminiferal Mg/Ca and temperature. Mg/Ca was measured in benthic foraminifera from 31 high-quality multicore tops collected in the Florida Straits, spanning a temperature range of 5.8 degrees to 18.6 degrees C. New calibrations are presented for Uvigerina peregrina, Planulina ariminensis, Planulina foveolata, and Hoeglundina elegans. The Mg/Ca values and temperature sensitivities vary among species, but all species exhibit a positive correlation that decreases in slope at higher temperatures. The decrease in the sensitivity of Mg/Ca to temperature may potentially be explained by Mg/Ca suppression at high carbonate ion concentrations. It is suggested that a carbonate ion influence on Mg/Ca may be adjusted for by dividing Mg/Ca by Li/Ca. The Mg/Li ratio displays stronger correlations to temperature, with up to 90% of variance explained, than Mg/Ca alone. These new calibrations are tested on several Last Glacial Maximum (LGM) samples from the Florida Straits. LGM temperatures reconstructed from Mg/Ca and Mg/Li are generally more scattered than core top measurements and may be contaminated by high-Mg overgrowths. The potential for Mg/Ca and Mg/Li as temperature proxies warrants further testing.
机译：[1]在过去的十年中，有孔虫试验中镁与钙的比例已成为有价值的古温度代用品。然而，底栖有孔虫的Mg / Ca与温度之间的关系仍然存在很大的不确定性。 Mg / Ca是在佛罗里达海峡中收集的31个高质量多核顶生底栖有孔虫中测量的，温度范围为5.8到18.6摄氏度。提出了针对Uvigerina peregrina，Planulina ariminensis，Planulina foveolata和Hoeglundina elegans的新标定。 。 Mg / Ca值和温度敏感性在不同物种之间有所不同，但所有物种均表现出正相关，在较高温度下其斜率降低。 Mg / Ca对温度的敏感性降低可能由高碳酸根离子浓度下的Mg / Ca抑制作用所解释。建议通过将Mg / Ca除以Li / Ca来调节碳酸根离子对Mg / Ca的影响。与单独的Mg / Ca相比，Mg / Li比与温度之间显示出更强的相关性，最多可解释90％的方差。这些新的校准已在佛罗里达海峡的几个最后冰期最大值（LGM）样本上进行了测试。由Mg / Ca和Mg / Li重建的LGM温度通常比堆芯顶部测量值散布得多，并且可能会因高Mg过度生长而受到污染。 Mg / Ca和Mg / Li作为温度代理的潜力值得进一步测试。

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