Radiocarbon analyses along the EDML ice core in Antarctica
Radiocarbon analyses along the EDML ice core in Antarctica
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沿南极洲 EDML 冰芯进行放射性碳分析
DOI：
10.1111/j.1600-0889.2006.00243.x
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
V. Peuch
中科院分区：
文献类型：
--
作者：
H. Clark;M. Cathala;H. Teyssèdre;J. Cammas;V. Peuch
在南极洲Kohnen站钻取的EDML岩心共17个样本，采用干法提取技术结合加速器质谱法分析14CO和14CO2。原位产生的14CO分数的结果表明，原位产生的14CO浓度非常低。尽管一氧化碳含量很低，但在二氧化碳部分中观察到显著的原位生产。我们第一次发现冰样本的背景值等于空白行。该数据集用于测试冰基质中14C产生的模型，并结合14CO2脱气和可能的14CO进入气泡。该模型尚未得到独立验证，但其应用为使用放射性碳分析作为冰中气泡的测年技术提供了机会。在对原位产量进行校正后，对原位产量计算的任意误差为25%，得出的年龄估计与基于火山层EDML与Dome C时间尺度匹配的年龄估计相一致，并结合firn扩散校正。
Samples, 17 in total, from the EDML core drilled at Kohnen station Antarctica are analysed for 14CO and 14CO2 with a dry-extraction technique in combination with accelerator mass spectrometry. Results of the in situ produced 14CO fraction show a very low concentration of in situ produced 14CO. Despite these low levels in carbon monoxide, a significant in situ production is observed in the carbon dioxide fraction. For the first time we found background values for the ice samples which are equal to line blanks. The data set is used to test a model for the production of 14C in the ice matrix, in combination with a degassing as 14CO2 and possibly as 14CO into the air bubbles. Application of the model, for which no independent validation is yet possible, offers the opportunity to use radiocarbon analysis as dating technique for the air bubbles in the ice. Assigning an arbitrary error of 25% to the calculation of the in situ production leads to age estimates, after correction for the in situ production, which are in agreement with age estimates based on a volcanic layer match of EDML to the Dome C timescale in combination with a correction for firn diffusion.