Transport of Carbon and Nitrogen to the Northern Adriatic Sea by the Po River

Pettine, M.; Patrolecco, Luisa; Camusso, M.; Crescenzio, Sonia

doi:10.1006/ecss.1997.0303

Cited by 104 publications

(53 citation statements)

References 21 publications

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“…Finally it should be remembered that the atmospheric nitrogen of the Po Valley, together with the even larger amounts of nitrogen used as fertilisers in the same area, reaches the Adriatic Sea via the Po River, with environmental effects on the coastal waters which are not yet completely understood (Paerl & Whitall 1999Pettine et al 1998). …”

Section: Discussionmentioning

confidence: 99%

Nitrogen budget of Lago Maggiore: the relative importance of atmospheric deposition and catchment sources

Mosello¹,

Barbieri²,

Brizzio³

et al. 2001

J Limnol

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Section: Discussionmentioning

confidence: 99%

Nitrogen budget of Lago Maggiore: the relative importance of atmospheric deposition and catchment sources

Mosello¹,

Barbieri²,

Brizzio³

et al. 2001

J Limnol

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“…Fukushima et al (2001) found that hydrophobic dissolved organic matter in the Hiroshima bay had similar concentration as in the riverine waters but is chemically different. Pettine et al (1998) found that behavior of organic matter in the Po River mixing zone was conservative in low to medium solid transport conditions, but have strong negative deviation with respect to the dilution line during high solid transport, presumably due to both settling of particulate matter in the pro-delta region and bacterial utilization of organic matter. Benner & Opsahl (2001) suggest that loss of terrigenous dissolved organic matter at low salinities is due to flocculation but not remineralization.…”

Section: Determination Of the Relative Acidity Of The Sasmentioning

confidence: 93%

“…It has been expected that seawater of these two stations would have more acidic properties due to expected high quantity of riverine organic matter discharged into the Northern Adriatic Sea (Pettine et al, 1998). Dominant organic substances in the riverine waters are coloured hydrophobic humic type substances (Ćosović et al, 1985(Ćosović et al, , Fukushima et al, 2001 which are very acidic (see Figure 6).…”

Section: Determination Of the Relative Acidity Of The Sasmentioning

confidence: 99%

Surface-active properties of organic matter in the North Adriatic Sea

Gašparović

Ćosović

2003

Estuarine, Coastal and Shelf Science

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Characterization of surface-active organic substances has been performed in the North Adriatic Sea, in surface and bottom layers, during the year 2000. Surfaceactive substances (SAS), their hydrophobicity and acidity, were estimated with alternating current voltammetry (in-phase mode) using o-nitrophenol as an electrochemical probe. Depending on hydrophobicity and acidity of present SAS electrochemical characteristics of the o-nitrophenol probe are changing in a specific way. Normalization of the change of prepeak height as an indication of organic matter acidity to shift of peak potential as a measure of hydrophobicity give indication of relative acidity of present SAS. Experiment with model substances showed that humic and fulvic acids contribute the highest to the relative acidity, while biogenic surface-active organic substances as proteins, polysaccharides and lipids contribute lower to the relative acidity.Surface water layer is characterized with higher phytoplankton excretion during whole year concluded from higher contribution of biogenic organic substances to surfactant activity. Humic and fulvic substances dominate in surfactant activity in the bottom layer. Proteinaceous material is found in a heterodispersed fraction during supposed phytoplankton blooms that were in March, July, September and even December, in the Northern Adriatic, connected to unexpectedly high temperatures. Surfactant activity of particulate fraction was found to be mainly less than 10 %. Exceptions were obtained in April and October when surfactant activity of particulate fraction contributed up to 55 and 20 %, respectively. 2

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“…At present, the Rhône River represents the major source of freshwater and terrestrial particulate matter to the Mediterranean Sea (Margat, 1992;Pettine et al, 1998;Sempéré et al, 2000). Furthermore, the Mediterranean shore is characterized by numerous coastal rivers that discharge significant amounts of water and sediment, mainly during the occurrence of short but violent flash flood events (Serrat et al, 2001;Bourrin et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Biogeochemical characterization of the riverine particulate organic matter transferred to the NW Mediterranean Sea

et al. 2014

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Abstract.A large amount of terrestrial organic matter is annually delivered by rivers to the continental shelf, where this material is either degraded, buried or transferred to the deep sea by hydrodynamic processes such as storms. The relative amount of terrestrial organic matter in the marine sediments is often determined by analysing the stable isotopes (δ 13 C and δ 15 N) and the C / N ratio of organic matter because the various particulate organic matter (POM) sources have distinct isotopic compositions. With the objective to refine and better interpret POM sources in the marine environment, we have characterized monthly terrestrial POM delivered by eight rivers discharging to the NW Mediterranean Sea: the Rhône, Hérault, Orb, Aude, Têt, Fluvià, Ter and Tordera rivers. These rivers were simultaneously sampled from November 2008 to December 2009 and the concentrations of total suspended matter (TSM), particulate organic carbon (POC) and nitrogen (PN), as well as their stable isotopic ratios (δ 13 C and δ 15 N) were determined.During the survey, three rainstorm events with winds coming from the E-NE and the S-SE impacted the NW Mediterranean. Depending on the direction of incoming winds, the fluvial response (amount of water discharge and TSM) was different. Rivers draining the Alps (Rhône River) and Central Massif (Hérault, Orb, and Aude rivers) were mostly impacted by rainstorms associated with winds coming from the S-SE, while rivers draining the Pyrenees (Têt, Fluvià, and Ter rivers) and the Montseny Massif (Tordera River) were impacted by rainstorms associated with winds coming from the E-NE. In addition, the spatial evolution of water discharges shows a different hydrological regime of the Rhône River, with relatively constant and high water stages and TSM concentrations when compared to coastal rivers, characterized by long periods of low water stages. TSM concentrations are positively correlated to water discharges (high water flows resuspended riverbed sediments) but show an inverse relationship with POC and PN relative contents (mostly due to dilution and by low availability of light in river waters during flood events). TSM in most of the coastal rivers have on average 2.5-3 times higher POC and PN mean contents than the Rhône River (8.5 and 1.5 %, respectively, for coastal rivers compared to 3.6 and 0.5 %, respectively, for the Rhône River). This discrepancy may be caused by the long drought periods in small coastal Mediterranean watersheds that enhance the eutrophication in studied coastal rivers. The δ 13 C ratios of organic matter also reflect this discrepancy between high and low water stages with values ranging from −33.2 to −24.5 ‰. The enriched 13 C values (−26.3 ± 0.4 ‰ for the Rhône River and −26.9 ± 1.2 ‰ for coastal rivers), measured during high water stages, express mostly a mixture of terrestrial source (plant remains and soils) whereas

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Transport of Carbon and Nitrogen to the Northern Adriatic Sea by the Po River

Cited by 104 publications

References 21 publications

Nitrogen budget of Lago Maggiore: the relative importance of atmospheric deposition and catchment sources

Nitrogen budget of Lago Maggiore: the relative importance of atmospheric deposition and catchment sources

Surface-active properties of organic matter in the North Adriatic Sea

Biogeochemical characterization of the riverine particulate organic matter transferred to the NW Mediterranean Sea

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