A robust calibration of the clumped isotopes to temperature relationship for foraminifers
A robust calibration of the clumped isotopes to temperature relationship for foraminifers
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DOI：
10.1016/j.gca.2019.11.022
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发表时间：
2020-02
影响因子：
5
通讯作者：
N. Meinicke;S. L. Ho;B. Hannisdal;Dirk Nürnberg;A. Tripati;Ralf Schiebel;A. N. Meckler
中科院分区：
文献类型：
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作者：
N. Meinicke;S. L. Ho;B. Hannisdal;Dirk Nürnberg;A. Tripati;Ralf Schiebel;A. N. Meckler
聚集同位素（Δ47）代用品是一种很有前途的地球化学工具，可以重建过去的海洋温度，因为其独特的热力学基础使其独立于其他环境因素，如海水成分。虽然以前受到大样本要求的限制，但最近的方法进步使Δ 47在小（<5 mg）有孔虫样本上的古海洋学应用成为可能。然而，在最近的方法进步之前进行的研究是基于相对较少的物种和数据处理，现在已经过时。为了克服这些限制并阐明物种特异性效应，我们分析了来自13个地点的沉积物表面样品中的14种浮游有孔虫，覆盖了100 -28 °C的生长温度范围。我们选择了混合层居住和深居住的物种从广泛的海洋环境，以评估不同水深的温度重建的可行性。各种技术来估计有孔虫钙化温度进行了测试，以评估其对校准的影响，并找到最合适的approaches.Results从这项研究基本上证实了以前的研究结果，有没有种属特异性的影响，对Δ47-温度的关系，在南极有孔虫，有一个可能的例外。各种morphotypes ofGlobigerinoides ruberwere found to often deviate from the general trend determined for aprotonic foraminifers.Our data are in excellent agreement with a recent foraminifer calibration study that was performed with a different analytical setup，as well as with a calibration based exclusively on benthic foraminifers.一个综合的，方法上均质化的数据集也揭示了非常好的协议与无机校准的基础上，cartinines。我们的研究结果突出了Δ 47古温度计应用于最近和灭绝物种的潜力，以研究海洋表面温度以及多种设置和时间尺度的温跃层变化。
The clumped isotope (Δ47) proxy is a promising geochemical tool to reconstruct past ocean temperatures far back in time and in unknown settings, due to its unique thermodynamic basis that renders it independent from other environmental factors like seawater composition. Although previously hampered by large sample-size requirements, recent methodological advances have made the paleoceanographic application of Δ47on small (<5 mg) foraminifer samples possible.Previous studies show a reasonable match between Δ47calibrations based on synthetic carbonate and various species of planktonic foraminifers. However, studies performed before recent methodological advances were based on relatively few species and data treatment that is now outdated. To overcome these limitations and elucidate species-specific effects, we analyzed 14 species of planktonic foraminifers in sediment surface samples from 13 sites, covering a growth temperature range of ∼0–28 °C. We selected mixed layer-dwelling and deep-dwelling species from a wide range of ocean settings to evaluate the feasibility of temperature reconstructions for different water depths. Various techniques to estimate foraminifer calcification temperatures were tested in order to assess their effects on the calibration and to find the most suitable approach.Results from this study generally confirm previous findings that there are no species-specific effects on the Δ47-temperature relationship in planktonic foraminifers, with one possible exception. Various morphotypes ofGlobigerinoides ruberwere found to often deviate from the general trend determined for planktonic foraminifers.Our data are in excellent agreement with a recent foraminifer calibration study that was performed with a different analytical setup, as well as with a calibration based exclusively on benthic foraminifers. A combined, methodologically homogenized dataset also reveals very good agreement with an inorganic calibration based on travertines. Our findings highlight the potential of the Δ47paleothermometer to be applied to recent and extinct species alike to study surface ocean temperatures as well as thermocline variability for a multitude of settings and time scales.