Journal
CHEMOSPHERE
Volume 195, Issue -, Pages 683-692Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.12.109
Keywords
Isotope composition; Carbon; Nitrogen; Phosphorus; Coastal area; Point and non-point sources
Categories
Funding
- SE.D.RI.PORT (Interreg Marittimo) research program (Toulon-Provence-Mediterranee (TPM))
- SE.D.RI.PORT (Interreg Marittimo) research program (Region PACA)
- SE.D.RI.PORT (Interreg Marittimo) research program (Conseil Departemental du Var)
- SE.D.RI.PORT (Interreg Marittimo) research program (l'Agence de l'Eau Rhone-Mediterrande et Corse)
- French Ministry of National Education, Higher Education and Research
- NSERC (Natural Sciences and Engineering Research Council of Canada)
- CARTOCHIM (Interreg Marittimo) research program (Toulon-Provence-Mediterranee (TPM))
- CARTOC (Interreg Marittimo) research program (Toulon-Provence-Mediterranee (TPM))
- PREVENT (Interreg Marittimo) research program (Toulon-Provence-Mediterranee (TPM))
- METFLUX (Interreg Marittimo) research program (Toulon-Provence-Mediterranee (TPM))
- CARTOCHIM (Interreg Marittimo) research program (Region PACA)
- CARTOC (Interreg Marittimo) research program (Region PACA)
- PREVENT (Interreg Marittimo) research program (Region PACA)
- METFLUX (Interreg Marittimo) research program (Region PACA)
- CARTOCHIM (Interreg Marittimo) research program (Conseil Departemental du Var)
- CARTOC (Interreg Marittimo) research program (Conseil Departemental du Var)
- PREVENT (Interreg Marittimo) research program (Conseil Departemental du Var)
- METFLUX (Interreg Marittimo) research program (Conseil Departemental du Var)
- CARTOCHIM (Interreg Marittimo) research program (l'Agence de l'Eau Rhone-Mediterrande et Corse)
- CARTOC (Interreg Marittimo) research program (l'Agence de l'Eau Rhone-Mediterrande et Corse)
- PREVENT (Interreg Marittimo) research program (l'Agence de l'Eau Rhone-Mediterrande et Corse)
- METFLUX (Interreg Marittimo) research program (l'Agence de l'Eau Rhone-Mediterrande et Corse)
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Nutrient loadings from either point or non-point sources to the environment are related to the growing global population. Subsequent negative impacts of nutrient loading to aquatic environments requires a better understanding of the biogeochemical cycling and better tools to track their sources. This study examines the carbon (C), nitrogen (N) and phosphorus (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 predicts 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 delta N-15. Although P is a monoisotopic element and total P concentration has been the sole index to study P loading, this study suggests an alternative approach to differentiate anthropogenic and non-anthropogenic (diagenetic) P, revealed point and non-point sources of P, and the corresponding P loading. Also, the diagenetic P background has been calculated for the 50-cm sediment layer of the whole Bay. (C) 2017 Elsevier Ltd. All rights reserved.
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