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Ferretto N., Tedetti Marc, Guigue C., Mounier S., Raimbault P., Goutx M. (2017). Spatio-temporal variability of fluorescent dissolved organic matter in the Rhone River delta and the Fos-Marseille marine area (NW Mediterranean Sea, France). Environmental Science and Pollution Research, 24 (5), 4973-4989. ISSN 0944-1344

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Lien direct chez l'éditeur doi:10.1007/s11356-016-8255-z

Titre
Spatio-temporal variability of fluorescent dissolved organic matter in the Rhone River delta and the Fos-Marseille marine area (NW Mediterranean Sea, France)
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000397007200065
AuteursFerretto N., Tedetti Marc, Guigue C., Mounier S., Raimbault P., Goutx M.
SourceEnvironmental Science and Pollution Research, 2017, 24 (5), p. 4973-4989. ISSN 0944-1344
RésuméThe spatio-temporal variability of fluorescent dissolved organic matter (FDOM) and its relationships with physical (temperature, salinity) and chemical (nutrients, chlorophyll a, dissolved and particulate organic carbon, nitrogen and phosphorus) parameters were investigated in inland waters of the Rhone River delta and the Fos-Marseille marine area (northwestern Mediterranean, France). Samples were taken approximately twice per month in two inland sites and three marine sites from February 2011 to January 2012. FDOM was analysed using fluorescence excitation-emission matrices (EEMs) coupled with parallel factor analysis (PARAFAC). In inland waters, humic-like components C1 (lambda(Ex)/lambda(Em): 250 (330)/394 nm) and C3 (lambda(Ex)/lambda(Em): 250 (350)/454 nm) dominated over one tryptophan-like component C2 (lambda(Ex)/lambda(Em): 230 (280)/340 nm), reflecting a background contribution of terrigenous material (similar to 67% of total fluorescence intensity, in quinine sulphate unit (QSU)) throughout the year. In marine waters, protein-like material, with tyrosine-like C4 (lambda(Ex)/lambda(Em): <220 (275)/<300 nm) and tryptophan-like C5 (lambda(Ex)/lambda(Em): 230 (280)/342 nm), dominated (similar to 71% of total fluorescence intensity, in QSU) over a single humic-like component C6 (lambda(Ex)/lambda(Em): 245 (300)/450 nm). In inland waters of the Rhone River delta, humic-like components C1 and C3 were more abundant in autumn-winter, very likely due to inputs of terrestrial organic matter from rainfalls, runoffs and wind-induced sediment resuspension. In marine sites, intrusions of the Berre Lagoon and Rhone River waters had a significant impact on the local biogeochemistry, leading to higher fluorescence intensities of humic-and protein-like components in spring-summer. On average, the fluorescence intensities of FDOM components C4, C5 and C6 increased by 33-81% under lower salinity. This work highlights the complex dynamics of FDOM in coastal waters and confirms the link between marine FDOM and the Rhne River freshwater intrusions on larger spatial and temporal scales in the Fos-Marseille marine area.
Plan de classementPollution [038] ; Hydrologie [062]
Descr. géo.FRANCE ; MEDITERRANNEE ; RHONE DELTA ; MARSEILLE ; FOS ; VACCARES ; BERRE
LocalisationFonds IRD [F B010069376]
Identifiant IRDfdi:010069376
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010069376

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