Vertical fluxes of aromatic and aliphatic hydrocarbons in the Northwestern Mediterranean Sea |
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Authors: | Deyme Rémi Bouloubassi Ioanna Taphanel-Valt Marie-Hélène Miquel Juan-Carlos Lorre Anne Marty Jean-Claude Méjanelle Laurence |
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Institution: | a Laboratoire d’Océanographie et du Climat, Expérimentation et Approches Numériques (LOCEAN/IPSL), Université Pierre et Marie Curie-CNRS-IRD-MNHN, UMR 7159, 4 Place Jussieu, 75252 Paris Cedex 05, France b Environment Laboratories, International Atomic Energy Agency, 4 Quai Antoine 1er, MC98000 Monaco, Principality of Monaco, Monaco c CNRS- Université Pierre et Marie Curie, UMR 7093, LOV, Observatoire océanographique, 06234 Villefranche/mer, France d Laboratoire d’ECObiogéochimie Benthique, FRE3350, CNRS-Université Pierre et Marie Curie, Avenue du Fontaulé, 66650 Banyuls Sur Mer, France |
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Abstract: | Aliphatic and aromatic hydrocarbon fluxes were measured in time series sediment trap samples at 200 m and at 1000 m depths in the open Northwestern Mediterranean Sea, from December 2000 to July 2002. Averaged fluxes of n-alkanes, UCM and T-PAH35 were 2.96 ± 2.60 μg m−2 d−1, 64 ± 60 μg m−2 d−1 and 0.68 ± 0.59 μg m−2 d−1, respectively. Molecular compositions of both hydrocarbon classes showed a contamination in petrogenic hydrocarbons well above the background levels of such an open site, whereas pyrolytic hydrocarbons stand in the range of other open Mediterranean locations. Fluxes displayed ample interannual and seasonal variabilities, mainly related to mass flux variation while concentration evolutions trigger secondary changes in pollutant fluxes. High lithogenic flux events exported particles with a larger pollutant load than biogenic particles formed during the spring bloom and during the summer. Sinking hydrocarbons were efficiently transported from 200 m to 1000 m. |
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Keywords: | Mediterranean Organic pollutants Hydrocarbons PAH NAH Particles Sediment traps Time series |
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