Application of high-resolution spectral absorbance measurements to determine dissolved organic carbon concentration in remote areas

Avagyan, Armine; Runkle, Benjamin R. K.; Kutzbach, Lars

doi:10.1016/j.jhydrol.2014.05.060

Cited by 60 publications

(61 citation statements)

References 45 publications

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“…We calibrated this landscape-scale model (Hummock-Hollow model, HH model hereafter) with data from an elevated bog in the UstPojeg mire complex, in the Komi Republic, Russia. A number of recent studies have analyzed this site's peat characteristics and depth (Pluchon et al, 2014), and provide measures of fluxes of water vapor (Runkle et al, 2012), carbon dioxide (Schneider et al, 2012), and methane (Gažovič et al, 2010;Wolf, 2009), as well as the energy and water balance (Runkle et al, 2014) and spatial distribution of dissolved organic carbon (DOC) (Avagyan et al, 2014b) and biogeochemical elements (Avagyan et al, 2014a).…”

Section: F Cresto Aleina Et Al: Modeling Micro-topographic Controlsmentioning

confidence: 99%

Modeling micro-topographic controls on boreal peatland hydrology and methane fluxes

et al. 2015

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Abstract. Small-scale surface heterogeneities can influence land-atmosphere fluxes and therefore carbon, water and energy budgets on a larger scale. This effect is of particular relevance for high-latitude ecosystems, because of the great amount of carbon stored in their soils. We introduce a novel micro-topographic model, the Hummock-Hollow (HH) model, which explicitly represents small-scale surface elevation changes. By computing the water table at the small scale, and by coupling the model with a process-based model for soil methane processes, we are able to model the effects of micro-topography on hydrology and methane emissions in a typical boreal peatland. In order to assess the effect of micro-topography on water the balance and methane emissions of the peatland we compare two versions of the model, one with a representation of micro-topography and a classical single-bucket model version, and show that the temporal variability in the model version with micro-topography performs better if compared with local data. Accounting for micro-topography almost triples the cumulative methane flux over the simulated time-slice. We found that the singlebucket model underestimates methane emissions because of its poor performance in representing hydrological dynamics. The HH model with micro-topography captures the spatial dynamics of water and methane fluxes, being able to identify the hotspots for methane emissions. The model also identifies a critical scale (0.01 km 2 ) which marks the minimal resolution for the explicit representation of micro-topography in larger-scale models.

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Section: F Cresto Aleina Et Al: Modeling Micro-topographic Controlsmentioning

confidence: 99%

Modeling micro-topographic controls on boreal peatland hydrology and methane fluxes

et al. 2015

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“…Since then, several studies (Aubert and Breuer, 2016;Avagyan et al, 2014;Grayson and Holden, 2012;Huebsch et al, 2015;Jeong et al, 2012;Krause et al, 2015;Strohmeier et al, 2013) made use of the technological progress in biogeochemical monitoring and increased the frequency and duration of measurements. High-frequency monitoring indeed has clear benefits.…”

Section: Introductionmentioning

confidence: 99%

“…They focused on DOC sources and DOC export under different flow conditions. Avagyan et al (2014) evaluated the performance and the application of the UV-VIS spectrometry method for DOC monitoring in a Russian mire complex. They compared it to other DOC measurement methods and concentrated on different absorbance wavelengths.…”

Section: Introductionmentioning

confidence: 99%

How runoff components affect the export of DOC and nitrate: a long-term and high-frequency analysis

Schwab

Klaus

Pfister

et al. 2017

Preprint

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Abstract. We monitored dissolved organic carbon (DOC) and nitrate concentrations and fluxes in situ with a UV-Vis spectrometer for two years at a high temporal resolution of 15 minutes in the forested Weierbach headwater catchment. The catchment exhibits a characteristic double peak runoff response to incident rainfall during periods with wet initial conditions. 10When initial conditions are dry, only the first discharge peak occurs. During our observations, both DOC and nitrate concentrations increased during the first discharge peak, while only nitrate concentrations were elevated during the second discharge peak. Relying on additional biweekly end-member data of precipitation, throughfall, soil water and groundwater, we linked the first peak to near surface flowpaths and the second peak to shallow groundwater reactions and subsurface flowpaths. The mass export of DOC and nitrate is largely controlled by the discharge yield. Nevertheless, this relationship is 15 altered by changing flowpaths during different wetness conditions in the catchment. Due to the absence of second discharge peaks during dry conditions, the DOC export is more relevant and the nitrate export is less relevant during dry catchment states. The study highlights the benefits of in-situ, long-term, and high-frequency monitoring for comparing DOC and nitrate export with runoff components that are changing rapidly during events as well as gradually between seasons. 20Hydrol. Earth Syst. Sci. Discuss., https://doi

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“…They are often used in wastewater drainage systems for a fast and simple evaluation of wastewater quality (Brito et al, 2014;Gamerith et al, 2011;Rieger et al, 2004;Rieger et al, 2006;Rieger et al, 2008). They have been used to estimate turbidity, dissolved organic carbon (DOC), total organic carbon (TOC) and nitrates (NO 3 -N) in streams at a temporal resolution as high as several minutes (Avagyan et al, 2014;Bass et al, 2011;Grayson and Holden, 2012;Huebsch et al, 2014;Huebsch et al, 2015;Jeong et al, 2012;Koehler et al, 2009;López-Kleine and Torres, 2014;Strohmeier et al, 2013;Waterloo et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

In situand high frequency monitoring of suspended sediment properties using a spectrophotometric sensor

et al. 2016

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It is well known that sediment properties, including sediment-associated chemical constituents and sediment physical properties, can exhibit significant variations within and between storm runoff events. However, the number of samples included in suspended sediment studies is often limited by time-consuming and expensive laboratory procedures after stream water sampling. This restricts high frequency sampling campaigns to a limited number of events and reduces accuracy when aiming to estimate fluxes and loads of sediment-associated chemical constituents. In this study, we address the potential of a portable ultraviolet-visible spectrophotometer (220-730 nm) to estimate suspended sediment properties in a resource efficient way. Several field deployable spectrophotometers are currently available for in-stream measurements of environmental variables at high temporal resolution. These instruments have primarily been developed and used to quantify solute concentrations (e.g. dissolved organic carbon and NO 3 -N), total concentrations of dissolved and particulate forms (e.g. total organic carbon) and turbidity. Here we argue that light absorbance values can be calibrated to estimate sediment properties. We present light absorbance data collected at 15-min intervals in the Weierbach catchment (NW Luxembourg, 0.45 km 2 ) from December 2013 to January 2015. In this proof-of-concept study, we performed a local calibration using suspended sediment loss-on-ignition (LOI) measurements as an example of suspended sediment property. We assessed the performance of several regression models that relate light absorbance measurements with the percentage weight LOI. The MM-robust regression method presented the lowest standard error of prediction (0.48%) and was selected for calibration (adjusted r 2 = 0.76 between observed and predicted values). The model was then used to predict LOI during a storm runoff event in December 2014. This study demonstrates that spectrophotometers can be used to estimate suspended sediment properties at high temporal resolution and for long-time spans in a simple, non-destructive and affordable manner.

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Application of high-resolution spectral absorbance measurements to determine dissolved organic carbon concentration in remote areas

Cited by 60 publications

References 45 publications

Modeling micro-topographic controls on boreal peatland hydrology and methane fluxes

Modeling micro-topographic controls on boreal peatland hydrology and methane fluxes

How runoff components affect the export of DOC and nitrate: a long-term and high-frequency analysis

In situand high frequency monitoring of suspended sediment properties using a spectrophotometric sensor

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