Variation of 14C in Japanese Tree Rings Related to the Fukushima Nuclear Accident
Variation of 14C in Japanese Tree Rings Related to the Fukushima Nuclear Accident
复制标题
与福岛核事故相关的日本树木年轮14C的变化
DOI：
10.1017/rdc.2019.47
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发表时间：
2019
期刊：
影响因子：
8.3
通讯作者：
Molnar Mihaly
中科院分区：
文献类型：
--
作者：
Varga Tamas;Palcsu Laszlo;Ohta Tomoko;Mahara Yasunori;Jull A J Timothy;Molnar Mihaly
对采自福岛县郡山市的柳杉年轮进行了放射性碳（14 C）分析。我们的主要目标是检测2011年3月11日福岛第一核电站事故中释放的任何14 C。我们还完成并评估了1990-2014年期间日本树木年轮中的14 C水平，因为当时日本岛屿缺乏环境14 C结果。为此，我们使用了一个轨迹模型来研究在发电厂和采样点区域的空气质量向前和向后的轨迹。模拟数据显示，无论是在2011年3月还是在生长季节（3 - 9月），气团主要移动到太平洋。在1990-2014年期间，任何样本中都没有明显的14 C过量，但几乎每个树木年轮样本中都有可检测到的Suess效应。平均化石贡献率为0.83 ± 0.01%，计算的人为成分比率，14 C过量在+0.5%和-1.6%之间变化。从1990年到2014年，Δ 14 C值从150.0‰下降到9.5‰，这是继14 C炸弹峰值下降之后，除了任何可检测到的苏斯效应之外。
Radiocarbon (14C) analysis was performed on Japanese cedar (Cryptomeria japonica) tree rings from Koriyama, Fukushima prefecture. Our primary aim was to detect any 14C release from the Fukushima Dai-ichi nuclear power plant accident on 11 March 2011. We also completed and assessed the 14C level in Japanese tree rings for the period of 1990–2014 because of the lack of environmental 14C results in the Japanese island that time. For this reason, we used a trajectory model to investigate the air mass forward and backward trajectories at the area of the power plant and sampling site. The modeling data show that the air masses mainly moved to the Pacific Ocean, both during March 2011 and during the growing season (March–September). During the period 1990–2014 there was no significant 14C excess in any of the samples, but there was a detectable Suess effect in almost every tree ring sample. The average fossil contribution was 0.83 ± 0.01% and the calculated anthropogenic component ratio, the 14C excess varied between +0.5 and –1.6%. The Δ14C value decreased from 150.0‰ to 9.5‰ from 1990–2014, which follows the decline of the 14C bomb peak, in addition to any detectable Suess effect.