Concentrations and fluxes of dissolved organic carbon in runoff from a forested catchment: insights from high frequency measurements

Strohmeier, Stefan; Knorr, Klaus‐Holger; Reichert, Martin; Frei, Sven; Fleckenstein, Jan H.; Peiffer, Stefan; Matzner, Egbert

doi:10.5194/bg-10-905-2013

Cited by 128 publications

(99 citation statements)

References 61 publications

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“…Q-C relationships) was attempted. This method is often successfully employed in smaller catchments (Strohmeier et al, 2013;Jollymore et al, 2012). When a valid Q-C relationship was obtained, the difference between loadings obtained using the monthly average method and the Q-C method was between −3.5 % and +3.8 %.…”

Section: Calculationsmentioning

confidence: 99%

Seasonal contribution of terrestrial organic matter and biological oxygen demand to the Baltic Sea from three contrasting river catchments

2014

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Abstract. To examine the potential influence of terrestrially derived DOM on the Baltic Sea, a year-long study of dissolved organic matter (DOM) was performed in three river catchments in Sweden. One catchment drains into the Bothnian Sea, while two southern catchments drain into the Baltic proper. Dissolved organic carbon (DOC) concentrations were positively correlated with discharge from forested catchments over the year. While the overall concentrations of DOC were several times higher in the southern two catchments, higher discharge in the northern catchment resulted in the annual loadings of DOC being on the same order of magnitude for all three catchments. Biological oxygen demand (BOD) was used as a proxy for the lability of carbon in the system. The range of BOD values was similar for all three catchments, however, the ratio of BOD to DOC (an indication of the labile fraction) in Ume river was four times higher than in the southern two catchments. Total annual BOD loading to the Baltic Sea was twice as high in the northern catchment than in the two southern catchments. Lower winter temperatures and preservation of organic matter in the northern catchment combined with an intense spring flood help to explain the higher concentrations of labile carbon in the northern catchment. Lower lability of DOM as well as higher colour in the southern catchments suggest that wetlands (i.e. peat bogs) may be the dominant source of DOM in these catchments, particularly in periods of low flow. With climate change expected to increase precipitation events and temperatures across the region, the supply and quality of DOM delivered to the Baltic Sea can also be expected to change. Our results indicate that DOM supply to the Baltic Sea from boreal rivers will be more stable throughout the year, and potentially have a lower bioavailability.

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Section: Calculationsmentioning

confidence: 99%

Seasonal contribution of terrestrial organic matter and biological oxygen demand to the Baltic Sea from three contrasting river catchments

2014

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“…Measurements of stream [DOC] with a low temporal resolution (e.g., weekly or monthly) cannot fully capture DOC changes that typically last for just a few hours in small streams during a storm event, resulting in large uncertainty when estimating DOC loads (Jollymore et al, 2012). Thus, optical sensors have been used to achieve high-resolution in situ monitoring of [DOC] (Etheridge et al, 2014;Jollymore et al, 2012;Koehler et al, 2009;Strohmeier et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Comparison of UV–VIS and FDOM sensors for in situ monitoring of stream DOC concentrations

et al. 2015

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Abstract. Optical measurements using ultraviolet-visible (UV-VIS) spectrophotometric sensors and fluorescent dissolved organic matter (FDOM) sensors have recently been used as proxies of dissolved organic carbon (DOC) concentrations in streams and rivers at a high temporal resolution. Despite the merits of the sensors, temperature changes and particulate matter in water can interfere with the sensor readings, over-or underestimating DOC concentrations. However, little efforts have been made to compare responses of the two types of the sensors to critical interferences such as temperature and turbidity. The performance of a UV-VIS sensor and an FDOM sensor was compared in both laboratory experiments and in situ monitoring in a forest stream in Korea during three storm events. Although the UV-VIS sensor did not require temperature correction in laboratory experiments using the forest stream water, the deviations of its values from the DOC concentrations measured with a TOC analyzer increased linearly as turbidity increased. In contrast, the FDOM sensor outputs decreased significantly as temperature or turbidity increased, requiring temperature and turbidity correction for in situ monitoring of DOC concentrations. The results suggest that temperature correction is relatively straightforward but turbidity correction may not be simple because the attenuation of light by particles can significantly reduce the sensitivity of the sensors in highly turbid waters. Shifts in composition of fluorophores also need to be carefully tracked using periodically collected samples since light absorbance and fluorescence can vary as the concentrations of dominant fluorophores change.

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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%

“…Grayson and Holden (2012) investigated the behavior of DOC in a bog system in northern Englandfocusing on the absorbance at different wavelengths to characterize the specific composition of DOC. Another study on 20 high-frequency DOC behavior was done by Strohmeier et al (2013) in a small forested catchment in Germany. They focused on DOC sources and DOC export under different flow conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The Weierbach catchment shows a dynamic combination of fast and delayed rainfall-runoff reactions, thus high-frequency monitoring has the potential for capturing the entire range of runoff processes, the resulting runoff components and related (Glaser et al, 2016;Klaus et al, 2015;Martínez-Carreras et al, 2016a;Pfister et al, 2017;Schwab et al, 2016). 15 The DOC and nitrate concentrations in the Weierbach creek were measured in-situ with the UV-Vis spectrometer spectro::lyser (s::can Messtechnik GmbH). The spectrometer measures the light absorption spectrum of the stream water between 220 and 720 nm in 2.5 nm resolution with a xenon flash lamp, 256 photo diodes and a two beam instrument.…”

Section: Introductionmentioning

confidence: 99%

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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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Concentrations and fluxes of dissolved organic carbon in runoff from a forested catchment: insights from high frequency measurements

Cited by 128 publications

References 61 publications

Seasonal contribution of terrestrial organic matter and biological oxygen demand to the Baltic Sea from three contrasting river catchments

Seasonal contribution of terrestrial organic matter and biological oxygen demand to the Baltic Sea from three contrasting river catchments

Comparison of UV–VIS and FDOM sensors for in situ monitoring of stream DOC concentrations

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

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