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CARBON ISOTOPE CHANGES THROUGH THE RECENT PAST: F14C AND δ13C VALUES IN SINGLE BARLEY GRAIN FROM 1852 TO 2020
Radiocarbon ( IF 8.3 ) Pub Date : 2024-02-14 , DOI: 10.1017/rdc.2024.8 E Dunbar , E M Scott , B G Tripney
Radiocarbon ( IF 8.3 ) Pub Date : 2024-02-14 , DOI: 10.1017/rdc.2024.8 E Dunbar , E M Scott , B G Tripney
Radiocarbon (F14 C) and stable carbon (δ13 C) values were measured in single grains of spring barley (Hordeum vulgare L. ) from the sample archive from two adjacent sites of the Long-term Experiments (LTEs) Hoosfield Spring Barley at Rothamsted Research (Harpenden, Hertfordshire, UK), covering the growing periods (March to September) of 1852 to 2020. F14 C data of the barley grain confirm that recent values are approaching and will decline below the “nominal” F14 C value of 1, tracking a similar decrease reported in other studies. Importantly, the measured δ13 C values reveal a different temporal decline over the pre-bomb and post-bomb timescale. Detailed statistical analysis of δ13 C data along with δ13 C analysis of independent, archived barley mash samples, verifies and quantifies the extent and rate of this decline. Evidence presented from the barley grain and barley mash samples suggests a clear breakpoint in δ13 C data occurring in 1995, where the rate of change alters, in that the slope in δ13 C data for the pre-1995 period is declining at 1.4‰ per century, and the slope in δ13 C for the post-1995 period is declining at 3.6‰ per century. Such a consistent shift in δ13 C data could be used with F14 C values to extend the use of the bomb peak for forensic, ecological, and environmental applications.
中文翻译:
近期碳同位素变化:1852 年至 2020 年单粒大麦中的 F14C 和 δ13C 值
放射性碳(F14 C) 和稳定碳 (δ13 C) 值是在春大麦的单粒中测量的(大麦 L. )来自洛桑研究中心(英国赫特福德郡哈彭登)长期实验 (LTE) 胡斯菲尔德春大麦两个相邻地点的样本档案,涵盖 1852 年至 2020 年的生长期(3 月至 9 月)。 F14 大麦籽粒的 C 数据证实,最近的值正在接近并将降至“名义”F 以下14 C 值为 1,跟踪其他研究中报告的类似下降。重要的是,测量的 δ13 C 值揭示了爆炸前和爆炸后时间尺度上不同的时间下降。δ 的详细统计分析13 C 数据以及 δ13 对独立、存档的大麦醪样品进行 C 分析,验证并量化了这种下降的程度和速率。大麦谷物和大麦醪样品提供的证据表明 δ 存在明显的断点13 C 数据发生于 1995 年,其中变化率发生变化,δ 的斜率13 1995 年之前的 C 数据以每世纪 1.4‰ 的速度下降,δ 的斜率13 1995 年以后的时期 C 正在以每世纪 3.6‰ 的速度下降。δ 的这种一致变化13 C数据可以与F一起使用14 C 值可扩展炸弹峰值在法医、生态和环境应用中的使用。
更新日期:2024-02-14
中文翻译:
近期碳同位素变化:1852 年至 2020 年单粒大麦中的 F14C 和 δ13C 值
放射性碳(F