Atmospheric radiocarbon levels were highly variable during the last deglaciation
Atmospheric radiocarbon levels were highly variable during the last deglaciation
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DOI：
10.1038/s43247-023-00929-9
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发表时间：
2023-07
期刊：
影响因子：
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通讯作者：
S. Talamo;M. Friedrich;F. Adolphi;B. Kromer;T. Heaton;Silvia Cercatillo;R. Muscheler;Dragana Paleček;Enrico Pelloni;Laura Tassoni;V. Toniello;L. Wacker
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文献类型：
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作者：
S. Talamo;M. Friedrich;F. Adolphi;B. Kromer;T. Heaton;Silvia Cercatillo;R. Muscheler;Dragana Paleček;Enrico Pelloni;Laura Tassoni;V. Toniello;L. Wacker
放射性碳测年法为研究过去的环境变化提供了一个关键的年代框架。在样品中测量的原始放射性碳年龄必须使用适当的校准曲线转换为日历年龄。树木年轮数据集为开发长期尺度上大气放射性碳水平的精确曲线提供了黄金标准。在这里，我们重建大气放射性碳水平使用长达千年的树木年轮年表段，延伸到末次冰期。这些样本是从意大利雷文粘土采石场回收的亚化石落叶松树中获得的。我们的重建显示，在18，475和17，350日历年之间，大气放射性碳的幅度比IntCal 20校准曲线中检测到的变化更大。比较新的树木年轮重建与Bernion-10来自冰芯的通量，我们假设这些变化是由太阳的变化。我们的研究结果表明，来自冰川树轮年代学的亚年代际放射性碳序列的独特价值。
Radiocarbon dating provides a key chronological framework for studying past environmental changes. Raw radiocarbon ages measured in samples must be converted to calendar ages using an appropriate calibration curve. Tree-ring datasets provide the gold-standard for developing a precise curve of atmospheric radiocarbon levels over long-time scales. Here, we reconstruct atmospheric radiocarbon levels using a millennium-long section of tree-ring chronology segments that extend into the last glacial period. The samples were obtained from subfossil larch trees recovered from clay quarries at Revine, Italy. Our reconstruction shows higher variations in the amplitude of atmospheric radiocarbon between 18,475 and 17,350 calendar years before the present than that detected in the IntCal20 calibration curve. Comparing the new tree-ring based reconstruction with Beryllium-10 fluxes derived from ice cores, we hypothesise that these variations are driven by solar variability. Our results demonstrate the unique value of sub-decadal radiocarbon sequences derived from glacial tree-ring chronologies.