Dissolved and particulate organic carbon fluxes from an agricultural watershed during consecutive tropical storms

Caverly, E. K.; Kaste, James M.; Hancock, Gregory S.; Chambers, Randolph M.

doi:10.1002/grl.50982

Cited by 39 publications

(25 citation statements)

References 38 publications

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“…Our results clearly showed that the export of organic carbon was enhanced by storm events and the effect was stronger with a higher rainfall (event 2), similar to previous studies. It may result from the changes in the water flow paths to upper organic-rich horizons (Fellman et al, 2009;Kim et al, 2010;Caverly et al, 2013;Strohmeier et al, 2013;Yang et al, 2013a). In addition, while DOC was the main form of organic carbon exported in baseflow, POC became more important in the peak flow (Fig.…”

Section: Dom Quantitymentioning

confidence: 97%

“…There are a variety of indices from absorption and fluorescence spectroscopy for characterizing the DOM quality, such as specific UV absorbance (SUVA), absorption spectral slope for the average molecular weight, humification index (HIX), and biological index (BIX) and fluorescence index (FI) for the DOM source (McKnight et al, 2001;Weishaar et al, 2003;Helms et al, 2008;Huguet et al, 2009). These spectroscopic indices also showed notable variations in storm events (Hood et al, 2006;Saraceno et al, 2009;Nguyen et al, 2010Nguyen et al, , 2013Inamdar et al, 2011;Yoon and Raymond, 2012;Caverly et al, 2013). However, few studies have incorporated spectroscopic DOM indices into EMMA for quantifying the contributions of various sources to the stream DOM.…”

Section: Introductionmentioning

confidence: 97%

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Tracking the evolution of stream DOM source during storm events using end member mixing analysis based on DOM quality

Yang

Chang

Shin

et al. 2015

Journal of Hydrology

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Section: Dom Quantitymentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Tracking the evolution of stream DOM source during storm events using end member mixing analysis based on DOM quality

Yang

Chang

Shin

et al. 2015

Journal of Hydrology

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“…However, it was obvious that the SUVA values of the raw water were higher in summer than in other seasons (ANOVA p<0.001), suggesting that there might be an influence of terrestrial inputs of enriched aromatic carbon from the tributaries (Dong et al 2014) (Fig 1). There were many reports demonstrating that soil-derived DOM exported from terrestrial environments during storms likely contains more aromatic moieties than the indigenous DOM in streams (Nguyen et al 2013;Caverly et al 2013;Yang et al 2015a). Figure 3 shows the representative SEC chromatograms detected by OCD and UVD for the DOM samples collected from Fig.…”

Section: Resultsmentioning

confidence: 97%

Tracking the behavior of different size fractions of dissolved organic matter in a full-scale advanced drinking water treatment plant

Quang

Choi²,

Hur

2015

Environ Sci Pollut Res

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In this study, five different dissolved organic matter (DOM) fractions, defined based on a size exclusion chromatography with simultaneous detection of organic carbon (OCD) and ultraviolet (UVD), were quantitatively tracked with a treatment train of coagulation/flocculation-sand filtration-ozonation-granular activated carbon (GAC) filtration in a full-scale advanced drinking water treatment plant (DWTP). Five DOM samples including raw water were taken after each treatment process in the DWTP every month over the period of three years. A higher abundance of biopolymer (BP) fraction was found in the raw water during spring and winter than in the other seasons, suggesting an influence of algal bloom and/or meltwater on DOM composition. The greater extent of removal was observed upon the coagulation/flocculation for high-molecular-weight fractions including BP and humic substances (HS) and aromatic moieties, while lower sized fractions were preferentially removed by the GAC filtration. Ozone treatment produced the fraction of low-molecular-weight neutrals probably resulting from the breakdown of double-bonded carbon structures by ozone oxidation. Coagulation/flocculation was the only process that revealed significant effects of influent DOM composition on the treatment efficiency, as revealed by a high correlation between the DOM removal rate and the relative abundance of HS for the raw water. Our study demonstrated that SEC-OCD-UVD was successful in monitoring size-based DOM composition for the advanced DWTP, providing an insight into optimizing the treatment options and the operational conditions for the removal of particular fractions within the bulk DOM.

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“…During storm events, it may represent a large flux of water (Delpla et al, 2011) contributing a large amount of DOC and POC to the stream (Caverly et al, 2013). Another potential surface source is litter leachate.…”

Section: Are These Modifications Recorded In the Stream Dom?mentioning

confidence: 99%

New molecular evidence for surface and sub-surface soil erosion controls on the composition of stream DOM during storm events

et al. 2017

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Abstract. Storm events are responsible for more than 60 % of the export of dissolved organic matter (DOM) from headwater catchments due to an increase in both the discharge and concentration. The latter was attributed to changing water pathways inducing the mobilization of DOM from the surface soil horizons. Recent molecular investigations have challenged this view and hypothesized (i) a contribution of an in-stream partition of organic matter (OM) between eroded particles and the dissolved fraction and (ii) the modification of the composition of soil DOM during storm events. To investigate these assumptions, soil solutions in the macropores, surface runoff and stream outlet were sampled at high frequency during three storm events in the KervidyNaizin catchment, part of the French critical zone observatory AgrHyS. The molecular composition of the DOM was analysed by thermally assisted hydrolysis and methylation (THM) with tetramethylammonium hydroxide (TMAH) coupled to a gas chromatograph and a quadrupole mass spectrometer. These analyses highlighted a modification of the DOM composition in soil solution controlled by the watertable dynamic and pre-event hydrological conditions. These findings fit with the mechanism of colloidal and particulate destabilization in the soil macroporosity. The different behaviour observed for lignins, carbohydrates and fatty acids highlights a potential chemical segregation based on their hydrophobicity. The composition of surface runoff DOM is similar to the DOM composition in soil solution and could be generated by the same mechanism. The DOM composition in both soil solution and surface runoff corresponds to the stream DOM composition observed during storm events. On the basis of these results, modifications of the stream DOM composition during storm events seem to be due to surface and sub-surface soil erosion rather than in-stream production.

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Dissolved and particulate organic carbon fluxes from an agricultural watershed during consecutive tropical storms

Cited by 39 publications

References 38 publications

Tracking the evolution of stream DOM source during storm events using end member mixing analysis based on DOM quality

Tracking the evolution of stream DOM source during storm events using end member mixing analysis based on DOM quality

Tracking the behavior of different size fractions of dissolved organic matter in a full-scale advanced drinking water treatment plant

New molecular evidence for surface and sub-surface soil erosion controls on the composition of stream DOM during storm events

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