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A glimpse of the Anthropocene captured by environmental tracers in the groundwater of a fractured aquifer

Abstract : Goldschmidt 2021 Abstract https://doi.org/10.7185/gold2021.6897 A glimpse of the Anthropocene captured by environmental tracers in the groundwater of a fractured aquifer DR. ELIOT CHATTON1, THIERRY LABASQUE2, WERNER AESCHBACH3, VIRGINIE VERGNAUD2 AND LUC AQUILINA4 1CNRS UMR61182Univ. Rennes, CNRS, UMS 33433Institute of Environmental Physics4Université de Rennes 1 Géosciences Rennes UMR 6118 Presenting Author: eliot.chatton@univ-rennes1.fr The Anthropocene is an epoch in Earth’s history that has been proposed to characterise the global impact of human activities on the Earth's atmosphere, biosphere, hydrosphere, geosphere, i.e. the Critical Zone. Just as for past climates, the signature of these anthropogenic impacts are recorded by environmental tracers dissolved in groundwater that could provide a better understanding of groundwater flows, residence time and mixing thus providing information on this major water resource both in terms of quantity and quality. In this study, we use dissolved gases (CFCs, SF6, 4He, 14C, noble gases, VOCs, stable isotopes) and groundwater chemical composition as environmental tracers to unveil insights of the Anthropocene in a fractured aquifer in the northwest of France. We analyse the impact of groundwater abstraction on residence time and excess air composition. We evidence the influence of climate change on groundwater recharge temperature (noble gas temperatures, NGT). We also quantify the appearance of anthropogenic compounds over the last decades. These observations enable us to define the Anthropocene signature in groundwater and the distribution of its impacts on the groundwater resource in order to gain a better picture of its resilience in the future.
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Submitted on : Monday, November 22, 2021 - 9:51:58 AM
Last modification on : Wednesday, November 24, 2021 - 3:13:26 AM

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Eliot Chatton, Thierry Labasque, Werner Aeschbach, Virginie Vergnaud, Luc Aquilina. A glimpse of the Anthropocene captured by environmental tracers in the groundwater of a fractured aquifer. Goldschmidt 2021, Jul 2021, Virtual, France. ⟨10.7185/gold2021.6897⟩. ⟨insu-03438986⟩

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