Distributions of dissolved organic carbon (DOC) and chromophoric dissolved organic matter (CDOM) in coastal waters of the northern Tyrrhenian Sea (Italy)

Vignudelli, Stefano; Santinelli, Chiara; Murru, Ester; Nannicini, L.; Seritti, A.

doi:10.1016/j.ecss.2003.11.023

Cited by 75 publications

(43 citation statements)

References 50 publications

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“…"Protein-like" fluorescence (F n (280)) was excited at a wavelength of 280 nm, with the emission peak recorded in the range 350 ± 5 nm. "Humiclike" fluorescence (F n (355)) was excited at 355 nm and its emission was measured at 450 ± 5 nm (Vodacek et al, 1997;Vignudelli et al, 2004). The fluorescence data were expressed as QSU (quinine sulfate units; Coble et al, 1998).…”

Section: Cdom Photodegradationmentioning

confidence: 99%

Spatio-seasonal variability of chromophoric dissolved organic matter absorption and responses to photobleaching in a large shallow temperate lake

et al. 2017

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Abstract. The development and validation of remotesensing-based approaches for the retrieval of chromophoric dissolved organic matter (CDOM) concentrations requires a comprehensive understanding of the sources and magnitude of variability in the optical properties of dissolved material within lakes. In this study, spatial and seasonal variability in concentration and composition of CDOM and the origin of its variation was studied in Lake Balaton (Hungary), a large temperate shallow lake in central Europe. In addition, we investigated the effect of photobleaching on the optical properties of CDOM through in-lake incubation experiments. There was marked variability throughout the year in CDOM absorption in Lake Balaton (a CDOM (440) = 0.06-9.01 m −1 ). The highest values were consistently observed at the mouth of the main inflow (Zala River), which drains humic-rich material from the adjoining Kis-Balaton wetland, but CDOM absorption decreased rapidly towards the east where it was consistently lower and less variable than in the westernmost lake basins. The spectral slope parameter for the interval of 350-500 nm (S CDOM (350-500)) was more variable with increasing distance from the inflow (observed range 0.0161-0.0181 nm −1 for the mouth of the main inflow and 0.0158-0.0300 nm −1 for waters closer to the outflow). However, spatial variation in S CDOM was more constant exhibiting a negative correlation with a CDOM (440). Dissolved organic carbon (DOC) was strongly positively correlated with a CDOM (440) and followed a similar seasonal trend but it demonstrated more variability than either a CDOM or S CDOM with distance through the system. Photobleaching resulting from a 7-day exposure to natural solar UV radiation resulted in a marked decrease in allochthonous CDOM absorption (7.04 to 3.36 m −1 , 42 % decrease). Photodegradation also resulted in an increase in the spectral slope coefficient of dissolved material.

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Section: Cdom Photodegradationmentioning

confidence: 99%

Spatio-seasonal variability of chromophoric dissolved organic matter absorption and responses to photobleaching in a large shallow temperate lake

et al. 2017

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“…In contrast, protein-like FDOM is known to be from biological production and anthropogenic sources (Baker and Spencer, 2004). Terrestrial humic substances behave conservatively in coastal areas due to their refractory characteristics (Del Castillo et al, 2000), whereas protein substances behave non-conservatively in many estuaries due to their relatively rapid production and degradation (Vignudelli et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Sources, fluxes, and behaviors of fluorescent dissolved organic matter (FDOM) in the Nakdong River Estuary, Korea

Lee¹,

Kim²

2018

Biogeosciences

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Abstract. We monitored seasonal variations in dissolved organic carbon (DOC), the stable carbon isotope of DOC (δ 13 C-DOC), and fluorescent dissolved organic matter (FDOM) in water samples from a fixed station in the Nakdong River Estuary, Korea. Sampling was performed every hour during spring tide once a month from October 2014 to August 2015. The concentrations of DOC and humic-like FDOM showed significant negative correlations against salinity (r 2 = 0.42-0.98, p < 0.0001), indicating that the river-originated DOM components were the major source and behave conservatively in the estuarine mixing zone. The extrapolated δ 13 C-DOC values (−27.5 to −24.5 ‰) in fresh water confirm that both components are mainly of terrestrial origin. The slopes of humic-like FDOM against salinity were 60-80 % higher in the summer and fall due to higher terrestrial production of humic-like FDOM. The slopes of proteinlike FDOM against salinity, however, were 70-80 % higher in spring due to higher biological production in river water. Our results suggest that there are large seasonal changes in riverine fluxes of humic-and protein-like FDOM to the ocean.

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“…major pathway of DOM consumption and transformation Del Vecchio and Blough 2002;Osburn et al 2009). Spectroscopic techniques such as UV absorption and fluorescence detection [3D excitation-emission matrices (EEMs)] are now used both in source and fate studies (Goldberg 1990;Her et al 2003;Alberts et al 2004;Vignudelli et al 2004;Jaffe et al 2008).…”

Section: Fluxes Of Organic Materialsmentioning

confidence: 99%

Fluxes of water, sediments, and biogeochemical compounds in salt marshes

et al. 2013

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Tidal oscillations systematically flood salt marshes, transporting water, sediments, organic matter, and biogeochemical elements such as silica. Here we present a review of recent studies on these fluxes and their effects on both ecosystem functioning and morphological evolution of salt marshes. We reexamine a simplified model for the computation of water fluxes in salt marshes that captures the asymmetry in discharge between flood and ebb. We discuss the role of storm conditions on sediment fluxes both in tidal channels and on the marsh platform. We present recent methods and field instruments for the measurement of fluxes of organic matter. These methods will provide long-term data sets with fine temporal resolution that will help scientists to close the carbon budget in salt marshes. Finally, the main processes controlling fluxes of biogenic and dissolved silica in salt marshes are explained, with particular emphasis on the uptake by marsh macrophytes and diatoms.

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Distributions of dissolved organic carbon (DOC) and chromophoric dissolved organic matter (CDOM) in coastal waters of the northern Tyrrhenian Sea (Italy)

Cited by 75 publications

References 50 publications

Spatio-seasonal variability of chromophoric dissolved organic matter absorption and responses to photobleaching in a large shallow temperate lake

Spatio-seasonal variability of chromophoric dissolved organic matter absorption and responses to photobleaching in a large shallow temperate lake

Sources, fluxes, and behaviors of fluorescent dissolved organic matter (FDOM) in the Nakdong River Estuary, Korea

Fluxes of water, sediments, and biogeochemical compounds in salt marshes

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