Relevance of using the non-reactive geochemical signature in sediment core to estimate historical tributary contributions

Bégorre, Céline; Dabrin, Aymeric; Morereau, Amandine; Lepage, Hugo; Mourier, Brice; Masson, Matthieu; Eyrolle, Frédérique; Coquery, Marina

doi:10.1016/j.jenvman.2021.112775

Cited by 5 publications

(2 citation statements)

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“…We can therefore assume a process of enhanced soil erosion in specific Isère River sub‐basins on Ni, Co and Cr element‐rich geological basements, leading to increasing concentrations of these TME over the past decade (2010s). However, only additional TME geochemical tracing methods, such as Pb, Cu and Zn isotopic fingerprinting techniques (Bird, 2011) or geochemical fingerprinting (Bégorre et al, 2021; Dabrin et al, 2021), could capture specific sources of TME in sediments. This heterogeneous pattern of the micropollutant yields of the Rhône River basin suggests that calculated micropollutants yields of the large river basins need to be considered with caution, in terms of the sources of the chemical fluxes.…”

Section: Discussionmentioning

confidence: 99%

“…We can therefore assume a process of enhanced soil erosion in specific Isère River sub-basins on Ni, Co and Cr element-rich geological basements, leading to increasing concentrations of these TME over the past decade (2010s). However, only additional TME geochemical tracing methods, such as Pb, Cu and Zn isotopic fingerprinting techniques (Bird, 2011) or geochemical fingerprinting (Bégorre et al, 2021;Dabrin et al, 2021) As a result, regarding TME, the lack of geochemical background data for each river basin is a significant barrier to considering TME yields as a consistent proxy for assessing river basin contamination. Indeed, as it stands, TME yields reflect a mixture comprising both the TME fraction coming from the local geological environment and TME fraction from the anthropogenic activity.…”

Section: Assessment Of the Relationship Between The Micropollutant Yi...mentioning

confidence: 99%

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Legacy‐micropollutant contamination levels in major river basins based on findings from the Rhône Sediment Observatory

Delile

Dendievel

Yari

et al. 2022

Hydrological Processes

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For more than half a century, chemical contamination has progressively spread to all the large river basins. Large river outlets integrate multiple anthropogenic pressures in watersheds, making them the largest source of sediment‐bound contaminants to continental shelf areas. However, comparing particulate micropollutant contaminations between the large river basins is a challenging task, especially due to the scarcity of long‐term river monitoring programs. Here we address this issue, with a focus on legacy particulate micropollutants (polychlorobiphenyls [PCBi], polycyclic aromatic hydrocarbons [PAHs] and trace metal elements [TME]) yields. For this purpose, we employed a bottom‐up multiscale approach to chemical contamination in river basins that takes micropollutant yields measured in the Rhône River sub‐basins (France) as a benchmark of other large river basins. Data on the Rhône River basin came from a unique 10‐year‐long monitoring program within the Rhône Sediment Observatory (OSR), and were compared to data gathered on 18 major worldwide river outlets. The Rhône River basin is far cleaner now than a few decades ago, likely due to environmental regulations. At a wider spatial scale, our results depict an overall contamination gradient splitting the most heavily contaminated river basins, located in developing and industrializing low‐to‐middle‐income countries, from the least contaminated rivers located in developed high‐income countries. We argue that chemical contamination levels of large river basins depend on their stage of economic development.

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Section: Discussionmentioning

confidence: 99%

Section: Assessment Of the Relationship Between The Micropollutant Yi...mentioning

confidence: 99%

Legacy‐micropollutant contamination levels in major river basins based on findings from the Rhône Sediment Observatory

Delile

Dendievel

Yari

et al. 2022

Hydrological Processes

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Improving the design and implementation of sediment fingerprinting studies: summary and outcomes of the TRACING 2021 Scientific School

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Purpose Identifying best practices for sediment fingerprinting or tracing is important to allow the quantification of sediment contributions from catchment sources. Although sediment fingerprinting has been applied with reasonable success, the deployment of this method remains associated with many issues and limitations. Methods Seminars and debates were organised during a 4-day Thematic School in October 2021 to come up with concrete suggestions to improve the design and implementation of tracing methods. Results First, we suggest a better use of geomorphological information to improve study design. Researchers are invited to scrutinise all the knowledge available on the catchment of interest, and to obtain multiple lines of evidence regarding sediment source contributions. Second, we think that scientific knowledge could be improved with local knowledge and we propose a scale of participation describing different levels of involvement of locals in research. Third, we recommend the use of state-of-the-art sediment tracing protocols to conduct sampling, deal with particle size, and examine data before modelling and accounting for the hydro-meteorological context under investigation. Fourth, we promote best practices in modelling, including the importance of running multiple models, selecting appropriate tracers, and reporting on model errors and uncertainty. Fifth, we suggest best practices to share tracing data and samples, which will increase the visibility of the fingerprinting technique in geoscience. Sixth, we suggest that a better formulation of hypotheses could improve our knowledge about erosion and sediment transport processes in a more unified way. Conclusion With the suggested improvements, sediment fingerprinting, which is interdisciplinary in nature, could play a major role to meet the current and future challenges associated with global change. Supplementary information The online version contains supplementary material available at 10.1007/s11368-022-03203-1.

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Tritium and 14C dependencies upon particulate organic matter within the nuclearized Rhone River (France)

et al. 2022

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Relevance of using the non-reactive geochemical signature in sediment core to estimate historical tributary contributions

Cited by 5 publications

References 37 publications

Legacy‐micropollutant contamination levels in major river basins based on findings from the Rhône Sediment Observatory

Legacy‐micropollutant contamination levels in major river basins based on findings from the Rhône Sediment Observatory

Improving the design and implementation of sediment fingerprinting studies: summary and outcomes of the TRACING 2021 Scientific School

Tritium and 14C dependencies upon particulate organic matter within the nuclearized Rhone River (France)

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