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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Artificial and natural radionuclides in cryoconite as tracers of supraglacial dynamics: Insights from the Morteratsch glacier (Swiss Alps)
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Artificial and natural radionuclides in cryoconite as tracers of supraglacial dynamics: Insights from the Morteratsch glacier (Swiss Alps)

机译：低温巨石的人工和天然放射性核素作为超普通动力学的示踪剂：来自Morteratch Glacier的见解（瑞士阿尔卑斯山）

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摘要

Cryoconite, a sediment found on the surface of glaciers, is known for its ability to accumulate radionuclides. New data on cryoconite from the Morteratsch glacier (Switzerland) are presented to shed light on the mechanisms that control the distribution of radioactivity in cryoconite. Among the radionuclides detected in our samples, we have identified Ag-108m, an artificial species which has never been observed in terrestrial environments before. This finding supports that cryoconite has an extraordinary ability to accumulate radioactivity. Our results also show that the radioactivity of cryoconite from a single glacier is far from uniform. Both the absolute amount of radioactivity and the relative contribution of single radionuclides are highly variable in samples from the Morteratsch glacier. To investigate the processes responsible for such variability, we have explored the correlation between radionuclides, organic and inorganic carbon fractions and the morphological features of cryoconite deposits. We have found that the degree of connection between cryoconite and supraglacial hydrology is particularly important, since it strongly influences the accumulation of radionuclides in cryoconite. Cryoconite holes connected with supraglacial channels are rich in cosmogenic Be-7; in contrast, poorly connected deposits are rich in artificial fallout radionuclides and elemental carbon. The very different half-lives of Be-7 and artificial radionuclides allowed us to discuss our findings in relation to the age and maturity of cryoconite deposits, highlighting the potential use of radionuclides to investigate hydrological supraglacial processes and material cycling at the surface of glaciers.
机译：冷冻胶质，冰川表面上发现的沉积物，以其积累放射性核素的能力而闻名。来自Morteratch Glacier（瑞士）的冷冻龙（瑞士）的新数据被提出阐明控制低温岩中放射性分布的机制。在我们样品中检测到的放射性核素中，我们已经确定了Ag-108M，以前从未在陆地环境中观察过的人造物种。这一发现支持低温onite具有非凡的积累放射性能力。我们的结果还表明，来自单个冰川的低温龙的放射性远非均匀。无放射性的绝对量和单个放射性核素的相对贡献都是来自Morteratsch冰川的样品中的高度变化。为了研究负责这种可变性的过程，我们探讨了放射性核素，有机和无机碳级分的相关性以及低温莫岩沉积物的形态学特征。我们发现，低温岩和超丙基水文之间的连接程度尤为重要，因为它强烈影响了放射性核素在低温岩中的积累。与超丙基通道连接的低温龙孔富含富含化学性BE-7;相比之下，连接良好的沉积物富含人工辐射放射性核素和元素碳。 BE-7和人工放射性核素的不同半衰期使我们能够与低温岩沉积物的年龄和成熟有关的发现，突出了放射性核素的潜在使用来研究水文超透法过程和在冰川表面循环循环的材料。

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