The nature and extent of bomb tritium remaining in deep vadose zone: A synthesis and prognosis

IF 2.5 3区地球科学 Q3 ENVIRONMENTAL SCIENCES

Vadose Zone Journal Pub Date : 2024-01-19 DOI:10.1002/vzj2.20304

Yanan Huang, Jaivime Evaristo, Zhi Li, Kwok P. Chun, Edwin H. Sutanudjaja, M. Bayani Cardenas, Marc F. P. Bierkens, James W. Kirchner, Martinus Th. van Genuchten

引用次数: 0

Abstract

Tritium present in deep vadose zones is a useful tracer for estimating groundwater recharge, but its full utility is constrained by not knowing where and for how long the tritium tracing method remains applicable. We obtained 44 tritium profiles from 17 globally distributed sites with vadose zone thicknesses of 12–624 m and used transport models to estimate the number of years that tritium may still be useful. Results show that the method may still be usable for 26 of 44 soil profiles surveyed, mainly in China, Australia, the United States, South Africa, and Senegal, with a remaining useful period of between 6 and 83 years. We also developed a statistical model that uses outputs from a hydrological model to predict the applicability of the tritium tracing method. Global implementation of the statistical model showed that the method remains usable at 20% of Earth's land mass (excluding Antarctica and Greenland) over the next few decades.

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炸弹氚残留在深层黏滞带的性质和范围：综述与预测

存在于深层软弱带中的氚是一种有用的示踪剂，可用于估算地下水补给量，但由于不知道氚示踪法在哪里以及在多长时间内仍然适用，因此其全部用途受到限制。我们从全球分布的 17 个地点获取了 44 份氚剖面图，这些地点的软化带厚度为 12-624 米，我们利用迁移模型估算了氚仍然有用的年限。结果表明，在调查的 44 个土壤剖面中，有 26 个剖面仍可使用该方法，主要分布在中国、澳大利亚、美国、南非和塞内加尔，剩余有效期在 6 年到 83 年之间。我们还开发了一个统计模型，利用水文模型的输出结果来预测氚追踪方法的适用性。统计模型的全球实施表明，在未来几十年内，该方法在地球 20% 的陆地面积（不包括南极洲和格陵兰岛）上仍然可用。

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

Vadose Zone Journal 环境科学-环境科学

CiteScore

5.60

自引率

7.10%

发文量

审稿时长

3.8 months

期刊介绍： Vadose Zone Journal is a unique publication outlet for interdisciplinary research and assessment of the vadose zone, the portion of the Critical Zone that comprises the Earth’s critical living surface down to groundwater. It is a peer-reviewed, international journal publishing reviews, original research, and special sections across a wide range of disciplines. Vadose Zone Journal reports fundamental and applied research from disciplinary and multidisciplinary investigations, including assessment and policy analyses, of the mostly unsaturated zone between the soil surface and the groundwater table. The goal is to disseminate information to facilitate science-based decision-making and sustainable management of the vadose zone. Examples of topic areas suitable for VZJ are variably saturated fluid flow, heat and solute transport in granular and fractured media, flow processes in the capillary fringe at or near the water table, water table management, regional and global climate change impacts on the vadose zone, carbon sequestration, design and performance of waste disposal facilities, long-term stewardship of contaminated sites in the vadose zone, biogeochemical transformation processes, microbial processes in shallow and deep formations, bioremediation, and the fate and transport of radionuclides, inorganic and organic chemicals, colloids, viruses, and microorganisms. Articles in VZJ also address yet-to-be-resolved issues, such as how to quantify heterogeneity of subsurface processes and properties, and how to couple physical, chemical, and biological processes across a range of spatial scales from the molecular to the global.