Constraints on the major sources of dissolved organic carbon in Alpine ice cores from radiocarbon analysis over the bomb‐peak period
Constraints on the major sources of dissolved organic carbon in Alpine ice cores from radiocarbon analysis over the bomb‐peak period
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DOI：
10.1002/jgrd.50200
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
B. May;D. Wagenbach;Helene Hoffmann;Michel Legrand;S. Preunkert;Peter Steier
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文献类型：
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作者：
B. May;D. Wagenbach;Helene Hoffmann;Michel Legrand;S. Preunkert;Peter Steier
放射性碳（14C）已被证明是区分有机气溶胶的现代和化石燃料来源的有力工具。通过将这一概念应用于溶解有机碳（DOC）部分的冰芯记录，我们开发了一种专门用于从阿尔卑斯山冰芯样品中提取DOC进行14C微量分析的装置。关于该分析方法的困难和局限性，研究表明，可以获得（6 ± 3）μgC的总工艺空白质量，14C特征为（0.71 ± 0.17），对应于工业用冰的最小样本量为200 g至工业前冰的最小样本量为800 g。来自高积累冰川Col du Dome（欧洲阿尔卑斯山）的8个DOC冰芯样品的放射性碳分析主要在炸弹高峰期进行。这些数据与夏季半年的雪沉积有关，表明化石的总体平均贡献率为（25 ± 9）%。适应的DO14C值的大气14CO2记录显示，生物输入到冰芯DOC与快速循环生物圈组件，可能与周转时间不到3年。
Radiocarbon (14C) has proven to be a powerful tool in distinguishing modern and fossil fuel sources contributing to organic aerosols. By applying this concept to ice core records of the dissolved organic carbon (DOC) fraction, we developed a setup dedicated to the extraction of DOC from Alpine ice core samples for 14C microanalysis. With respect to the difficulties and limitations of this analytical method, it is shown that a total process blank mass of (6 ± 3) μgC with a 14C signature of (0.71 ± 0.17) can be obtained, corresponding to a minimum sample size between 200 g for industrial and 800 g for pre‐industrial ice. Radiocarbon analyses of eight DOC ice core samples from the high accumulation glacier Col du Dôme (European Alps) were mainly performed over the bomb‐peak period. These data, being associated with snow deposition over the summer half‐years, show an overall mean fossil contribution of (25 ± 9) %. Adaptation of the DO14C values to the atmospheric 14CO2 record revealed that the biogenic input to ice core DOC is associated with a fast recycling biospheric component, likely linked to a turnover time of less than 3 years.