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Quantitative model of Carbon and Nitrogen isotope composition to highlight sources of nutrient discharge in coastal area (Toulon Bay, NW Mediterranean Sea)

Abstract : Nutrient loadings from either point or non-point sources to the environments are related to the growing global population. Subsequent negative impacts of nutrient loading on the environments requires a better understanding of their biogeochemical cycling and better tools to track their sources. This study examines the C, N and P discharge and cycling in a Mediterranean coastal area from rivers to marine sediments and assesses the anthropogenic contributions. Carbon and N concentrations and isotope compositions in rivers particles, surface sediments, and sediment cores were investigated to build up a quantitative multiple-end-member mixing model for C and N isotopes. This model has allowed determining the contribution of four natural and one anthropogenic sources to the sediments and highlighted the anthropogenic fraction of P based on the relationship with anthropogenic δ15N. Although P is a monoisotopic element and P total concentration has been the sole index to study P loading, this study suggests an alternative approach to differentiate anthropogenic and non-anthropogenic (diagenetic) P and revealed point and non-point sources of P and the corresponding P loading. Also, the diagenetic P background has been established for the 50-cm sediment layer of the whole Bay.
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https://hal.archives-ouvertes.fr/hal-01879413
Contributor : Stéphane Mounier <>
Submitted on : Saturday, September 29, 2018 - 3:43:08 PM
Last modification on : Tuesday, November 10, 2020 - 4:51:16 PM
Long-term archiving on: : Monday, December 31, 2018 - 10:36:26 AM

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Duc Huy Dang, R. Douglas Evans, Gaël Durrieu, Amonda El Houssainy, Jean-Ulrich Mullot, et al.. Quantitative model of Carbon and Nitrogen isotope composition to highlight sources of nutrient discharge in coastal area (Toulon Bay, NW Mediterranean Sea). Chemosphere, Elsevier, 2018, 194, pp.543 - 552. ⟨10.1016/j.chemosphere.2017.12.109⟩. ⟨hal-01879413⟩

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