DOC, absorption and fluorescence properties of estuarine and coastal waters of the Northern Tyrrhenian Sea

Seritti, A.; Russo, David; Nannicini, L.; Vecchio, Rossana Del

doi:10.3184/095422998782775790

Cited by 47 publications

(51 citation statements)

References 47 publications

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“…Both a(355) and FDOM were significantly higher in the Xiaoqing River than in the Laizhou estuary (p < 0.05). This matched the pattern of CDOM and DOC in other river-estuaries, with lower values in the estuary/coastal water than in the upstream freshwater (Seritti et al, 1998;Rochelle-Newall and Fisher, 2002;Asmala et al, 2013Asmala et al, , 2016. Compared with other studies (Support Information SI2, Table S1), DOC and CDOM in this study was most similar to river-estuary systems influenced by anthropogenic effluences, such as Yangtze River estuary , and at the southern and western coasts of Florida (Green and Blough, 1994).…”

Section: Dom Quantitysupporting

confidence: 86%

“…Compared with other studies (Support Information SI2, Table S1), DOC and CDOM in this study was most similar to river-estuary systems influenced by anthropogenic effluences, such as Yangtze River estuary , and at the southern and western coasts of Florida (Green and Blough, 1994). Our concentrations of DOC and CDOM was lower than in the more pristine (terrestrial dominated) river-estuary systems in the Baltics (Asmala et al, 2013(Asmala et al, , 2016 and in the Arno River-Tyrrhenian Sea estuary system (Seritti et al, 1998), but higher than in C adiz Bay, Spain (Catal a et al, 2013), a similar semi-enclosed system located in the southwest of the Iberian Peninsula. Interestingly, in the Pearl River estuary, in southern China, which is also heavily influenced by anthropogenic effluences, the CDOM was not as high as in the Laizhou Bay estuary (Chen et al, 2004;Hong et al, 2005).…”

Section: Dom Quantitysupporting

confidence: 57%

See 1 more Smart Citation

Characteristics of dissolved organic matter (DOM) and relationship with dissolved mercury in Xiaoqing River-Laizhou Bay estuary, Bohai Sea, China

Jiang

Skyllberg

Björn

et al. 2017

Environmental Pollution

104

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a b s t r a c tBecause of heterogeneous properties, dissolved organic matter (DOM) is known to control the environmental fate of a variety of organic pollutants and trace metals in aquatic systems. Here we report absorptive and fluorescence properties of DOM, in concurrence with concentrations of dissolved mercury (Hg), along the Xiaoqing River-Laizhou Bay estuary system located in the Bohai Sea of China. A mixing model consisting of the two end-members terrestrial and aquatic DOM demonstrated that terrestrial signatures decreased significantly from the river into the estuary. Quasi-conservative mixing behavior of DOM sources suggests that the variations in the average DOM composition were governed by physical processes (e.g., dilution) rather than by new production and/or degradation processes. In contrast to some previous studies of river-estuary systems, the Xiaoqing River-Laizhou Bay estuary system displayed a non-significant correlation between DOM and Hg quantities. Based on this and the variation of Hg concentration along the salinity gradient, we concluded that Hg showed a non-conservative mixing behavior of suggested end-member sources. Thus, rather than mixing, Hg concentration variations seemed to be controlled by biogeochemical processes.

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Section: Dom Quantitysupporting

confidence: 86%

Section: Dom Quantitysupporting

confidence: 57%

Characteristics of dissolved organic matter (DOM) and relationship with dissolved mercury in Xiaoqing River-Laizhou Bay estuary, Bohai Sea, China

Jiang

Skyllberg

Björn

et al. 2017

Environmental Pollution

104

View full text Add to dashboard Cite

show abstract

“…Spectral slopes are another tool in differentiating between the sources and bleaching extent of organic matter in aquatic systems (Green and Blough 1994;De Souza Sierra et al 1997;Seritti et al 1998). In a recent study (Tzortziou et al 2007), different spectral slopes for CDOM from a tidal marsh vs. an adjacent river estuary were attributed to marsh-derived CDOM with distinct optical and chemical composition.…”

Section: Resultsmentioning

confidence: 99%

Saltmarshes as a source of chromophoric dissolved organic matter (CDOM) to Southern California coastal waters

Clark

Litz

Grant

2008

Limnology & Oceanography

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To determine chromophoric dissolved organic matter (CDOM) sources in Southern California coastal waters, optical properties of a river outlet and adjacent tidally flushed salt marshes were monitored (dry season; JuneJuly 2001). Average absorption coefficients doubled at ebb vs. flood tides (4.8 6 1.5 vs. 2.1 6 0.9 m 21 ; 300 nm), suggesting significant salt marsh CDOM inputs into coastal waters. Average spectral slopes were not statistically different for any sites or tides (0.010 6 0.002 nm 21 ), consistent with salt marsh CDOM dominating coastal waters. Three-dimensional fluorescence excitation-emission matrices (EEMs) at ebb tide showed contributions from terrestrial, protein, and marine humic-like peaks, suggesting production and output of these materials from the marsh. A marine humic signal at the river outlet during an offshore upwelling event indicated an additional sporadic nonmarsh marine humic-like source. EEMs of six common salt marsh plant leachates showed protein, terrestrial, and marine humic-like peaks. To estimate CDOM photodegradation in the marsh, fluorescence intensity decays from photobleaching experiments were fit to first-order kinetics. Most humic peaks degraded with a half-life of t 1/2 5 10-20 h, which overlaps the estimated residence time of water in the marshes (,12 h). Most protein peaks were resistant to photodegradation, suggesting that the low levels of protein vs. humic-like material measured in natural waters was due to rapid bioutilization of proteinaceous material. The rapid photodegradation of plant leachate humic material and the low spectral slopes for the field sites suggest that marsh sediments would be an important source of CDOM.

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“…This represents the first report of the potential biogeochemical influence of the Rhône River plume in this oligotrophic coastal area. Such a strong significant inverse relationship between salinity and fluorescent/absorbant CDOM is typically observed in coastal areas subjected to high river inputs (Blough et al, 1993;Green and Blough, 1994;Nelson and Guarda, 1995;Højerslev et al, 1996;Nieke et al, 1997;Vodacek et al, 1997;Seritti et al, 1998;Del Castillo et al, 2000;Ferrari, 2000;Stedmon et al, 2000).…”

Section: Evidence For a Biological Origin Of Cdom At Sofcom Stationmentioning

confidence: 96%

Fluorescence and absorption properties of chromophoric dissolved organic matter (CDOM) in coastal surface waters of the northwestern Mediterranean Sea, influence of the Rhône River

et al. 2010

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(350) could be determined. By contrast, the spectral slope of CDOM absorption (S CDOM ) was significantly higher (0.023 ± 0.003 nm −1 ) in summer than in fall and winter periods (0.017 ± 0.002 nm −1 ), reflecting either CDOM photobleaching or production in surface waters during stratified sunny periods. The CDOM fluorescence, assessed through excitation emission matrices (EEMs), was dominated by protein-like component (peak T; 1.30-21.94 QSU) and marine humic-like component (peak M; 0.55-5.82 QSU), while terrestrial humic-like fluorescence (peak C; 0.34-2.99 QSU) remained very low. This reflected a dominance of relatively fresh material from biological origin within the CDOM fluorescent pool. At the end of summer, surface CDOM fluorescence was very low and strongly blue shifted, reinforcing the hypothesis of CDOM photobleaching. Our results suggested that unusual RhôneCorrespondence to: R. Sempéré (sempere@univmed.fr) River plume eastward intrusion events might reach Marseilles Bay within 2-3 days and induce local phytoplankton blooms and subsequent fluorescent CDOM production (peaks M and T) without adding terrestrial fluorescence signatures (peaks C and A). Besides Rhône River plumes, mixing events of the entire water column injected relative aged (peaks C and M) CDOM from the bottom into the surface and thus appeared also as an important source of CDOM in surface waters of the Marseilles Bay. Therefore, the assessment of CDOM optical properties, within the hydrological context, pointed out several biotic (in situ biological production, biological production within Rhône River plumes) and abiotic (photobleaching, mixing) factors controlling CDOM transport, production and removal in this highly urbanized coastal area.

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DOC, absorption and fluorescence properties of estuarine and coastal waters of the Northern Tyrrhenian Sea

Cited by 47 publications

References 47 publications

Characteristics of dissolved organic matter (DOM) and relationship with dissolved mercury in Xiaoqing River-Laizhou Bay estuary, Bohai Sea, China

Characteristics of dissolved organic matter (DOM) and relationship with dissolved mercury in Xiaoqing River-Laizhou Bay estuary, Bohai Sea, China

Saltmarshes as a source of chromophoric dissolved organic matter (CDOM) to Southern California coastal waters

Fluorescence and absorption properties of chromophoric dissolved organic matter (CDOM) in coastal surface waters of the northwestern Mediterranean Sea, influence of the Rhône River

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