CARBON ISOTOPE CHANGES THROUGH THE RECENT PAST: F14C AND δ13C VALUES IN SINGLE BARLEY GRAIN FROM 1852 TO 2020

IF 2 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Radiocarbon Pub Date : 2024-02-14 DOI:10.1017/rdc.2024.8

E Dunbar, E M Scott, B G Tripney

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引用次数: 0

Abstract

Radiocarbon (F14C) and stable carbon (δ13C) 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. F14C data of the barley grain confirm that recent values are approaching and will decline below the “nominal” F14C value of 1, tracking a similar decrease reported in other studies. Importantly, the measured δ13C values reveal a different temporal decline over the pre-bomb and post-bomb timescale. Detailed statistical analysis of δ13C data along with δ13C 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 δ13C data occurring in 1995, where the rate of change alters, in that the slope in δ13C data for the pre-1995 period is declining at 1.4‰ per century, and the slope in δ13C for the post-1995 period is declining at 3.6‰ per century. Such a consistent shift in δ13C data could be used with F14C values to extend the use of the bomb peak for forensic, ecological, and environmental applications.

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近代以来的碳同位素变化：1852 年至 2020 年单粒大麦的 F14C 和 δ13C 值

从罗斯姆斯泰德研究所（英国赫特福德郡哈彭登）长期实验（LTEs）胡斯菲尔德春大麦（Hoosfield Spring Barley）两个相邻地点的样本档案中测量了春大麦（Hordeum vulgare L.）单粒的放射性碳（F14C）和稳定碳（δ13C）值，涵盖 1852 年至 2020 年的生长期（3 月至 9 月）。大麦谷物的 F14C 数据证实，最近的数值正在接近并将下降到 1 的 "名义 "F14C 值以下，这与其他研究中报告的类似下降趋势一致。重要的是，测得的δ13C 值显示，在原子弹爆炸前和爆炸后的时间尺度上，下降的时间有所不同。对 δ13C 数据的详细统计分析，以及对独立存档的大麦醪样品进行的 δ13C 分析，验证并量化了这种下降的程度和速度。从大麦谷物和大麦醪样品中获得的证据表明，δ13C 数据在 1995 年出现了一个明显的断点，在这个断点上，变化率发生了变化，即 1995 年之前的δ13C 数据斜率以每百年 1.4‰的速度下降，而 1995 年之后的δ13C 数据斜率以每百年 3.6‰的速度下降。δ13C数据的这种一致变化可与F14C值一起用于扩大炸弹峰在法医、生态和环境方面的应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Radiocarbon 地学-地球化学与地球物理

CiteScore

16.20

自引率

6.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Radiocarbon serves as the leading international journal for technical and interpretive articles, date lists, and advancements in 14C and other radioisotopes relevant to archaeological, geophysical, oceanographic, and related dating methods. Established in 1959, it has published numerous seminal works and hosts the triennial International Radiocarbon Conference proceedings. The journal also features occasional special issues. Submissions encompass regular articles such as research reports, technical descriptions, and date lists, along with comments, letters to the editor, book reviews, and laboratory lists.