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首页> 外文期刊>Paleoceanography >Radiocarbon Age Offsets Between Two Surface Dwelling Planktonic Foraminifera Species During Abrupt Climate Events in the SW Iberian Margin
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Radiocarbon Age Offsets Between Two Surface Dwelling Planktonic Foraminifera Species During Abrupt Climate Events in the SW Iberian Margin

机译：在SW伊伯利亚边缘的突然气候事件突然气候事件期间，在两个表面居住浮游生物的覆盖物的辐射碳

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摘要

This study identifies temporal biases in the radiocarbon ages of the planktonic foraminifera species Globigerina bulloides and Globigerinoides ruber (white) in a sediment core from the SW Iberian margin (so-called Shackleton site). Leaching of the outer shell and measurement of the radiocarbon content of both the leachate and leached sample enabled us to identify surface contamination of the tests and its impact on their ~(14)C ages. Incorporation of younger radiocarbon on the outer shell affected both species and had a larger impact downcore. Interspecies comparison of the ~(14)C ages of the leached samples reveal systematic offsets with ~(14)C ages for G. ruber being younger than G. bulloides ages during the last deglaciation and part of the Early and mid-Holocene. The greatest offsets (up to 1,030 years) were found during Heinrich Stadial 1, the Younger Dryas, and part of the Holocene. The potential factors differentially affecting these two planktonic species were assessed by complementary 14C, oxygen and carbon isotopes, and species abundance determinations. The coupled effect of bioturbation with changes in the abundance of G. ruber is invoked to account for the large age offsets. Our results highlight that ~(14)C ages of planktonic foraminifera might be largely compromised even in settings characterized by high sediment accumulation rates. Thus, a careful assessment of potential temporal biases must be performed prior to using ~(14)C ages for paleoclimate investigations or radiocarbon calibrations (e.g., marine calibration curve Marine13, Reimer et al., 2013, https://doi.org/10.2458/azu_js_rc.55.16947).
机译：该研究将来自SW伊伯利亚边缘（所谓的Shackleton站点）的沉积物核心中浮游生物的Forminifera Globigerina Blowigerina Blowigerina Bowloides和Globigerinoides ruber（白色）的态度偏差识别。外壳的浸出和测量浸出液和浸出样品的含弧菌含量的含量使我们能够识别测试的表面污染及其对其〜（14）C年龄的影响。在外壳上的较年轻的辐射碳氮化影响了两种物种，并越来越大。浸出样品的〜（14）℃的间隙比较揭示系统偏移与〜（14）C年龄的〜（14）C年龄在最后的G.Babroides年龄在最后的下注和中全新世中的一部分。在Heinrich Stadial 1，Therfer Dross和全新世的一部分中发现了最大的抵消（最多1,030岁）。通过互补的14C，氧气和碳同位素和物种丰度测定评估差异影响这两个浮游物种的潜在因素。生物扰动与G.Ruber丰富变化的耦合效果被调用，以占大型抵消。我们的结果突出显示〜（14）C型浮游动物的青年人可能在很大程度上损害，即使在具有高沉积物积累速率的设置。因此，必须在使用〜（14）C年龄之前进行潜在的时间偏差的仔细评估古古怪的调查或无线电碳钙校准（例如，海洋校准曲线13，Reimer等，2013，https://doi.org/ 10.2458 / azu_js_rc.55.16947）。

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