Size fractionation and optical properties of dissolved organic matter in the continuum soil solution-bog-river and terminal lake of a boreal watershed

Ilina, Svetlana; Drozdova, O. Yu.; Lapitskiy, S. A.; Alekhin, Yuriy V.; Демин, В. В.; Zavgorodnyaya, Yuliya A.; Shirokova, Liudmila S.; Viers, Jérôme; Pokrovsky, Oleg S.

doi:10.1016/j.orggeochem.2013.10.008

Cited by 80 publications

(55 citation statements)

References 92 publications

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“…Our results do not contradict the findings from previous studies that have proposed the selective loss of pigmented DOC in freshwater networks (Ilina et al, 2014;Weyhenmeyer et al, 2012;Köhler et al, 2013). Rather, this study can help explain why previous studies have not been able to detect decreasing color with increasing water residence time in headwaters (Müller et al, 2013) where many of the lakes presumably follow the dynamics of the brown-water regime (see Fig.…”

Section: Conceptual Implicationscontrasting

confidence: 51%

Quality transformation of dissolved organic carbon during water transit through lakes: contrasting controls by photochemical and biological processes

et al. 2018

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Abstract. Dissolved organic carbon (DOC) may be removed, transformed, or added during water transit through lakes, resulting in changes in DOC composition and pigmentation (color). However, the process-based understanding of these changes is incomplete, especially for headwater lakes. We hypothesized that because heterotrophic bacteria preferentially consume noncolored DOC, while photochemical processing removes colored fractions, the overall changes in DOC color upon water passage through a lake depend on the relative importance of these two processes, accordingly. To test this hypothesis we combined laboratory experiments with field studies in nine boreal lakes, assessing both the relative importance of different DOC decay processes (biological or photochemical) and the loss of color during water transit time (WTT) through the lakes. We found that influence from photo-decay dominated changes in DOC quality in the epilimnia of relatively clear headwater lakes, resulting in systematic and selective net losses of colored DOC. However, in highly pigmented brown-water lakes (absorbance at 420 nm > 7 m −1 ) biological processes dominated, and there was no systematic relationship between color loss and WTT. Moreover, in situ data and dark experiments supported our hypothesis on the selective microbial removal of nonpigmented DOC, mainly of low molecular weight, leading to persistent water color in these highly colored lakes. Our study shows that brown headwater lakes may not conform to the commonly reported pattern of the selective removal of colored constituents in freshwaters, as DOC can show a sustained degree of pigmentation upon transit through these lakes.

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Section: Conceptual Implicationscontrasting

confidence: 51%

Quality transformation of dissolved organic carbon during water transit through lakes: contrasting controls by photochemical and biological processes

et al. 2018

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“…This variation may be the result of dilution. The high values (up to 12) are explained by the presence of low molecular mass fulvic acids in the water [21]. The low values indicate input of DOM originating from the soil.…”

Section: Optical Propertiesmentioning

confidence: 98%

Impact of seasonal climate change on optical and molecular properties of river water dissolved organic matter by HPLC-SEC and UV-vis spectroscopy

Lepane

Depret

Väli

et al. 2015

Chem. Biol. Technol. Agric.

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Background: The change in the optical parameters of dissolved organic matter (DOM) from natural water samples of Pirita River in Estonia were studied during 2 years of winter-spring season. At present, the relative quantitative and qualitative composition of DOM components leached from soils to water, in relation to air and water temperatures and water level fluctuations, has not been estimated in Estonia. The aim was to characterise and fractionate DOM using high-performance size-exclusion chromatography with multiple wavelength detection (DAD) and ultraviolet-visible (UV-vis) spectroscopy. Changes in several chromatographic/molecular and spectroscopic/optical parameters were investigated. Results: The experimental data indicated that the optical and molecular properties of DOM depend on the climate conditions, but the effect can be diverse. In cold climates, the concentration of DOM in river water can be lower (2013) or higher (2014) than in warmer climate conditions. Optical properties indicate that the quantity of humic substances (HS) is minimal under an ice cover and DOM contains more microbial-derived peptide-like constituents. Conclusions:The results point out the usefulness of HPLC-SEC and UV-vis spectroscopy for climate change-related DOM studies in real environmental conditions. Used methods enable detailed monitoring of humic molecules dissolved from the catchment soil, as well as microbial constituents (peptide-like components of DOM). The used approach can be additionally applied for monitoring the changes of raw water quality and thus for the design and optimisation of drinking water process technology.

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“…The UV absorbance of the filtered samples was measured at 280 nm using a quartz 10 mm cuvette on a Cary-50 spectrophotometer. The specific UV absorbency (SUVA 280 , L mg −1 m −1 ) is used as a proxy for aromatic C, molecular weight, and source of dissolved organic matter (DOM) (Uyguner and Bekbolet, 2005;Weishaar et al, 2003;Ilina et al, 2014, and references therein). The SUVA 280 in the present study was used for consistency with previous measurements of lakes and rivers in western Siberia (Shirokova et al, 2013;Manasypov et al, 2015Manasypov et al, , 2017Pokrovsky et al, 2015) and permafrost-draining rivers in central Siberia .…”

Section: Analysesmentioning

confidence: 99%

“…At the same time, interstitial soil solutions are known to be efficient tracers of ongoing bio-geochemical processes in the critical zone (Hendershot et al, 1992;Stutter and Billett, 2003;Quinton and Pomeroy, 2006;Karavanova and Malinina, 2007;Gangloff et al, 2016) and can help to decipher the intensity of carbon and metals migration from the soil to the rivers and further to the ocean. However, in contrast to significant number of in situ measurements of DOC and metals in the interstitial soil solutions of the boreal zone (Van Hees et al, 2000a, b;Reynolds et al, 2004;Starr and Ukonmaanaho, 2004;Michalzik et al, 2001;Giesler et al, 2006;Ilina et al, 2014;Griffiths and Sebestyen, 2016;Shotyk et al, 2016b) there are relatively few studies of soil porewaters from the permafrost regions (e.g., Marlin et al, 1993;Prokushkin et al, 2005;Pokrovsky et al, 2006Pokrovsky et al, , 2013Koch et al, 2013;Jessen et al, 2014;Fouché et al, 2014;Mavromatis et al, 2014;Herndon et al, 2015), none of them dealing with organic-rich peatland soils. Only recently, reported results soil porewaters from the yedoma wetland soil within the flow-path continuum from the soil to the Kolyma River mainstream.…”

Section: Introductionmentioning

confidence: 99%

Dissolved organic carbon and major and trace elements in peat porewater of sporadic, discontinuous, and continuous permafrost zones of western Siberia

et al. 2017

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Abstract. Mobilization of dissolved organic carbon (DOC) and related trace elements (TEs) from the frozen peat to surface waters in the permafrost zone is expected to enhance under ongoing permafrost thaw and active layer thickness (ALT) deepening in high-latitude regions. The interstitial soil solutions are efficient tracers of ongoing bio-geochemical processes in the critical zone and can help to decipher the intensity of carbon and metals migration from the soil to the rivers and further to the ocean. To this end, we collected, across a 640 km latitudinal transect of the sporadic to continuous permafrost zone of western Siberia peatlands, soil porewaters from 30 cm depth using suction cups and we analyzed DOC, dissolved inorganic carbon (DIC), and 40 major elements and TEs in 0.45 µm filtered fraction of 80 soil porewaters.Despite an expected decrease in the intensity of DOC and TE mobilization from the soil and vegetation litter to the interstitial fluids with the increase in the permafrost coverage and a decrease in the annual temperature and ALT, the DOC and many major and trace elements did not exhibit any distinct decrease in concentration along the latitudinal transect from 62.2 to 67.4 • N. The DOC demonstrated a maximum of concentration at 66 • N, on the border of the discontinuous/continuous permafrost zone, whereas the DOC concentration in peat soil solutions from the continuous permafrost zone was equal to or higher than that in the sporadic/discontinuous permafrost zone. Moreover, a number of major (Ca, Mg) and trace (Al, Ti, Sr, Ga, rare earth elements (REEs), Zr, Hf, Th) elements exhibited an increasing, not decreasing, northward concentration trend. We hypothesize that the effects of temperature and thickness of the ALT are of secondary importance relative to the leaching capacity of peat, which is in turn controlled by the water saturation of the peat core. The water residence time in peat pores also plays a role in enriching the fluids in some elements: the DOC, V, Cu, Pb, REEs, and Th were a factor of 1.5 to 2.0 higher in mounds relative to hollows. As such, it is possible that the time of reaction between the peat and downward infiltrating waters essentially controls the degree of peat porewater enrichments in DOC and other solutes. A 2 • northward shift in the position of the permafrost boundaries may bring about a factor of 1.3 ± 0.2 decrease in Ca, Mg, Sr, Al, Fe, Ti, Mn, Ni, Co, V, Zr, Hf, Th, and REE porewater concentration in continuous and discontinuous permafrost zones, and a possible decrease in DOC, specific ultraviolet absorbency (SUVA), Ca, Mg, Fe, and Sr will not exceed 20 % of their current values. The projected increase in ALT and vegetation density, northward migration of the permafrost boundary, or the change of hydrological regime is unlikely to modify chemical composition of peat porewater fluids larger than their natural variations within different micro-landscapes, i.e., within a factor of 2. The decrease in DOC and metal delivery to small rivers and lakes by peat soil ...

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Size fractionation and optical properties of dissolved organic matter in the continuum soil solution-bog-river and terminal lake of a boreal watershed

Cited by 80 publications

References 92 publications

Quality transformation of dissolved organic carbon during water transit through lakes: contrasting controls by photochemical and biological processes

Quality transformation of dissolved organic carbon during water transit through lakes: contrasting controls by photochemical and biological processes

Impact of seasonal climate change on optical and molecular properties of river water dissolved organic matter by HPLC-SEC and UV-vis spectroscopy

Dissolved organic carbon and major and trace elements in peat porewater of sporadic, discontinuous, and continuous permafrost zones of western Siberia

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