使用年度树木年轮记录追踪加拿大安大略省南部核电站的本地放射性碳排放

IF 3.3 2区 地球科学 Q2 ENVIRONMENTAL SCIENCES
Felix Vogel , Carley Crann , Michael F.J. Pisaric
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引用次数: 0

摘要

了解大气中二氧化碳(CO2)的放射性碳(14C)含量是许多研究领域的基础。这项研究表明,如何在加拿大最大的城市地区追踪核电站在当地和区域范围内的影响。由于化石燃料燃烧产生的二氧化碳排放,该地区的二氧化碳消耗非常严重。2018年在安大略省南部收集的树核显示,每年的树木年轮记录的年代际趋势与背景地点的大气测量结果相同。靠近二氧化碳或化石燃料来源的树核反映了这些局部影响。从核电站顺风处20公里处收集的14C数据与该核电站2009-2018年的年度报告排放量高度相关(R2=0.76)。将分析回溯到20世纪90年代,14CO2的排放量是现在的4-8倍。当时,14CO2的排放量足以影响一个遥远的背景监测点。关于城市化石燃料的二氧化碳排放特征,来自多伦多市中心的一棵树的纤维素中的14CO2具有极其耗尽的Δ14C特征。当地交通排放的信号盖过了该地区核排放的二氧化碳。这项研究表明,有更多的核心来反映1990年之前的核14CO2排放和更合适的城市采样地点(即代表一个社区而不是一条道路),这种方法有可能更好地跟踪加拿大以及全球其他地方城市化和核电站的长期影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tracking local radiocarbon releases from nuclear power plants in southern Ontario (Canada) using annually-dated tree-ring records

Understanding the radiocarbon (14C) content of atmospheric carbon dioxide (CO2) underlies many fields of research. This study shows how one can track the influence of nuclear power plants at the local and regional scale in Canada’s largest urban area. This area is subject to significant 14CO2 depletion due to CO2 emissions from fossil fuel burning. Tree cores collected across southern Ontario in 2018 show that tree-rings dated annually record the same decadal trends as atmospheric measurements at a background site. Tree cores taken closer to 14CO2 or fossil fuel sources reflect those local influences. Data of 14C from a site 20 kilometer downwind from a nuclear power plant is highly correlated (R2=0.76) with annually reported emissions from the plant for 2009-2018. Extending the analysis back to the 1990s shows that the emissions of 14CO2 were 4-8 times higher than those at present. At that time, 14CO2 emissions were sufficiently strong to affect a remote background monitoring site. Concerning the urban fossil fuel CO2 emission signature, 14CO2 in the cellulose of a tree from downtown Toronto has an extremely depleted Δ14C signature. The local signal from traffic emissions overshadows any 14CO2 from nuclear emissions in the region. This study suggests that, with more cores to reflect the emissions of nuclear 14CO2 before 1990 and more suitable urban sampling locations (i.e., representative of a neighborhood rather than one road), this approach has potential to better track the long-term impact of urbanization and nuclear power plants in Canada, and potentially elsewhere around the globe.

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来源期刊
Anthropocene
Anthropocene Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)
CiteScore
6.30
自引率
0.00%
发文量
27
审稿时长
102 days
期刊介绍: Anthropocene is an interdisciplinary journal that publishes peer-reviewed works addressing the nature, scale, and extent of interactions that people have with Earth processes and systems. The scope of the journal includes the significance of human activities in altering Earth’s landscapes, oceans, the atmosphere, cryosphere, and ecosystems over a range of time and space scales - from global phenomena over geologic eras to single isolated events - including the linkages, couplings, and feedbacks among physical, chemical, and biological components of Earth systems. The journal also addresses how such alterations can have profound effects on, and implications for, human society. As the scale and pace of human interactions with Earth systems have intensified in recent decades, understanding human-induced alterations in the past and present is critical to our ability to anticipate, mitigate, and adapt to changes in the future. The journal aims to provide a venue to focus research findings, discussions, and debates toward advancing predictive understanding of human interactions with Earth systems - one of the grand challenges of our time.
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