An assessment of optical properties of dissolved organic material as quantitative source indicators in the Santa Ana River basin, Southern California

Bergamaschi, Brian A.; Kalve, Erica; Guenther, Larry; Mendez, Gregory O.; Belitz, Kenneth

doi:10.3133/sir20055152

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…The use of optical properties as proxies for DOC concentration has been recognized for many years in the field of oceanography (Coble, 2007). Recently, several studies have shown that absorption coefficients (e.g., A 254 , A 330 , and A 440 ) and fluorescence at excitation 370 nm and emission 460 nm, defined here as fluorescent dissolved organic matter (FDOM), are good predictors of DOC concentration in surface waters (e.g., Bergamaschi et al, 2005; Belzile et al, 2006; Downing et al, 2009; Saraceno et al, 2009). In this dataset, fluorescence was a better predictor of DOC concentration than A 254 (Table 3).…”

Section: Resultsmentioning

confidence: 99%

Determining Sources of Dissolved Organic Carbon and Disinfection Byproduct Precursors to the McKenzie River, Oregon

Kraus

Anderson²,

Morgenstern

et al. 2010

J of Env Quality

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This study was conducted to determine the main sources of dissolved organic carbon (DOC) and disinfection byproduct (DBP) precursors to the McKenzie River, Oregon (USA). Water samples collected from the mainstem, tributaries, and reservoir outflows were analyzed for DOC concentration and DBP formation potentials (trihalomethanes [THMFPs] and haloacetic acids [HAAFPs]). In addition, optical properties (absorbance and fluorescence) of dissolved organic matter (DOM) were measured to provide insight into DOM composition and assess whether optical properties are useful proxies for DOC and DBP precursor concentrations. Optical properties indicative of composition suggest that DOM in the McKenzie River mainstem was primarily allochthonous--derived from soils and plant material in the upstream watershed. Downstream tributaries had higher DOC concentrations than mainstem sites (1.6 +/- 0.4 vs. 0.7 +/- 0.3 mg L(-1)) but comprised < 5% ofmainstem flows and had minimal effect on overall DBP precursor loads. Water exiting two large upstream reservoirs also had higher DOC concentrations than the mainstem site upstream of the reservoirs, but optical data did not support in situ algal production as a source of the added DOC during the study. Results suggest that the first major rain event in the fall contributes DOM with high DBP precursor content. Although there was interference in the absorbance spectra in downstream tributary samples, fluorescence data were strongly correlated to DOC concentration (R2 = 0.98), THMFP (R2 = 0.98), and HAAFP (R2 = 0.96). These results highlight the value of using optical measurements for identifying the concentration and sources of DBP precursors in watersheds, which will help drinking water utilities improve source water monitoring and management programs.

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Section: Resultsmentioning

confidence: 99%

Determining Sources of Dissolved Organic Carbon and Disinfection Byproduct Precursors to the McKenzie River, Oregon

Kraus

Anderson²,

Morgenstern

et al. 2010

J of Env Quality

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“…Although the information obtained through fluorescence measurements is not as definitive as molecular biomarker analyses, fluorescence data are still directly tied to the chemical composition of dissolved constituents, and as such can be used to determine DOM source and processing history. A number of studies have related fluorescence properties of natural waters to the concentration, source and composition of DOM [e.g., Bergamaschi et al , 2005; McKnight et al , 2001; Stedmon et al , 2003]. For example, certain features in fluorescence excitation emission matrices (EEMs) such as hypsochromic shifts in peaks attributed to humic and fulvic‐like material have been attributed to a breakdown in aromaticity [ Blough and Del Vecchio , 2002; Coble , 1996] and thus have been used to distinguish between allochthonous and autochthonous‐derived DOM [ Spencer et al , 2007a].…”

Section: Introductionmentioning

confidence: 99%

Fluorescence‐based proxies for lignin in freshwater dissolved organic matter

et al. 2009

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[1] Lignin phenols have proven to be powerful biomarkers in environmental studies; however, the complexity of lignin analysis limits the number of samples and thus spatial and temporal resolution in any given study. In contrast, spectrophotometric characterization of dissolved organic matter (DOM) is rapid, noninvasive, relatively inexpensive, requires small sample volumes, and can even be measured in situ to capture fine-scale temporal and spatial detail of DOM cycling. Here we present a series of crossvalidated Partial Least Squares models that use fluorescence properties of DOM to explain up to 91% of lignin compositional and concentration variability in samples collected seasonally over 2 years in the Sacramento River/San Joaquin River Delta in California, United States. These models were subsequently used to predict lignin composition and concentration from fluorescence measurements collected during a diurnal study in the San Joaquin River. While modeled lignin composition remained largely unchanged over the diurnal cycle, changes in modeled lignin concentrations were much greater than expected and indicate that the sensitivity of fluorescence-based proxies for lignin may prove invaluable as a tool for selecting the most informative samples for detailed lignin characterization. With adequate calibration, similar models could be used to significantly expand our ability to study sources and processing of DOM in complex surface water systems.

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“…Advances in optical sensor technology have made it possible to use in-situ fluorometers to quantify DOM concentration and composition. Specifically, the fluorescing component of DOM (FDOM) can be measured continuously and used as a reliable proxy for concentrations of dissolved organic carbon (DOC); with the addition of other signals such as turbidity, FDOM also can be used to estimate particulate organic carbon (POC) and total organic carbon (TOC) concentrations (Bergamaschi et al, 2005Pellerin et al, 2012;Saraceno et al, 2009;Spencer et al, 2007).…”

Section: Background and Problemmentioning

confidence: 99%

Investigating organic matter in Fanno Creek, Oregon, Part 3 of 3: Identifying and quantifying sources of organic matter to an urban stream

Goldman

Rounds

Keith

et al. 2014

Journal of Hydrology

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An assessment of optical properties of dissolved organic material as quantitative source indicators in the Santa Ana River basin, Southern California

Cited by 7 publications

References 10 publications

Determining Sources of Dissolved Organic Carbon and Disinfection Byproduct Precursors to the McKenzie River, Oregon

Determining Sources of Dissolved Organic Carbon and Disinfection Byproduct Precursors to the McKenzie River, Oregon

Fluorescence‐based proxies for lignin in freshwater dissolved organic matter

Investigating organic matter in Fanno Creek, Oregon, Part 3 of 3: Identifying and quantifying sources of organic matter to an urban stream

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