Higher reactivity of allochthonous vs. autochthonous DOC sources in a shallow lake

Catalán, Núria; Obrador, Biel; Felip, Marisol; Pretus, Joan Lluís

doi:10.1007/s00027-013-0302-y

Cited by 62 publications

(63 citation statements)

References 60 publications

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“…As we expected, the water column in DH was most transparent (both PAR and UV radiation) during the rainy season when the water column was stratified and with DOM components of a more aromatic structure (higher SUVA) and more susceptible to photobleaching (Weishaar et al, 2003;Helms et al, 2008;Catalán et al, 2013;Zhang et al, 2013a). Positive correlations between S 350-400 and nutrients (TP and TN) only during the rainy season suggest that microbial degradation in the epilimnion might be limited by nutrients during thermal stratification.…”

Section: Seasonality Of Optical Properties Between the Contrasting Symentioning

confidence: 54%

“…The different DOM sources in these systems also alter the importance of DOM degradation processes, as allochthonous terrestrial carbon is known to be more humic consisting of heavier and more aromatic molecules being typically more photodegraded. In contrast, the autochthonous microbial/algal derived DOM consisted as expected by simpler molecules of low molecular weight, less affected by photodegradation but more susceptible to biodegradation (McKnight et al, 1994;Benner, 2002;Catalán et al, 2013, Zhang et al, 2013b.…”

Section: Sources Of Dom and Underwater Light Climatementioning

confidence: 90%

“…The DOM source affects some characteristics of lakes, as their transparency to UV and PAR radiation, and recently some studies have compared the differences in optical quality between DOM from autochthonous and allochthonous sources (Spencer et al, 2009;Bracchini et al, 2010;Shank et al, 2010;Catalán et al, 2013;Zhang et al, 2013a). The PAR and UV attenuation in Pampulha were much higher than in DH.…”

Section: Sources Of Dom and Underwater Light Climatementioning

confidence: 99%

“…The spatial variation is given by the heterogeneity of the environment, as the presence or absence of macrophytes, different depths and the proximity to the borders which increases the impact by the input of allochthonous matter and nutrients by runoff (Wetzel, 1992;Tao, 1998;Obrador and Pretus, 2013). The seasonal variation derives from changes in DOM sources, such as higher input of allochthonous organic matter in the lake during the rainy season and the highest incidence of radiation in spring and summer, which can increase photodegradation rates of CDOM and still favor the lability of the molecules through the breakage part, facilitating microbial degradation (Bertilsson and Tranvik, 1998;Neale et al, 2007;Fasching and Battin, 2012;Catalán et al, 2013). Furthermore, CDOM degradation is also affected by the availability of nutrients throughout the year, a limiting factor for microbial degradation.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal changes in optical properties of two contrasting tropical freshwater systems

2016

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Section: Seasonality Of Optical Properties Between the Contrasting Symentioning

confidence: 54%

Section: Sources Of Dom and Underwater Light Climatementioning

confidence: 90%

Section: Sources Of Dom and Underwater Light Climatementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Seasonal changes in optical properties of two contrasting tropical freshwater systems

2016

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“…For the combinations that included discharge, we generally observed weaker and more heterogeneous relationships (Figure 3 c,e,f and he Weierbach catchment, we are convinced that SUVAidentifying terrestrial DOC in diel DOC fluctuations. Several studies already demonstrated that SUVA (Catalán et al, 2013;Fasching et al, 2016;Lee et al, 2016;Weishaar et al catchment for rising SUVA-254 values serving as a valid index Immediately after rain events, discharge, DOC concentrations and SUVA surface or near-surface runoff processes (Glaser et al, 2016;Klaus et al, 2015) the increase in DOC concentrations was induced by terrestrial DOC input that s on processes controlling diel DOC fluctuations. For the days with diel fluctu generally observed both DOC and SUVA-254 maxima in the afternoon.…”

Section: Resultsmentioning

confidence: 99%

Diel fluctuations of viscosity-driven riparian inflow affect streamflow DOC concentration

Schwab

Klaus

Pfister

et al. 2017

Preprint

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Abstract. Diel fluctuations of streamwater DOC concentrations are generally explained by a complex interplay of different instream processes. We measured the light absorption spectrum of water and DOC concentrations in-situ and with highfrequency by means of a UV-Vis spectrometer during 18 months at the outlet of a forested headwater catchment in 10 Luxembourg (0.45 km 2 ). We generally observed diel DOC fluctuations with a maximum in the afternoon during days thatwere not affected by rainfall-runoff events. We identified an increased inflow of terrestrial DOC to the stream in the afternoon, causing the DOC maxima in the stream. The terrestrial origin of the DOC was derived from the SUVA-254(specific UV absorbance at 254 nm) index, which is a good indicator for the aromaticity of DOC. In the studied catchment, the only possible process that can explain the diel DOC input variations towards the stream is the so-called viscosity effect. 15The water temperature in the upper parts of the riparian zone is increasing during the day, leading to a lower viscosity and therefore a higher hydraulic conductivity. Consequently, more water from areas that are rich in terrestrial DOC passes through the riparian zone and contributes to streamflow in the afternoon. We believe that not only diel instream processes, but also viscosity driven diel fluctuations of terrestrial DOC input should be considered for explaining diel DOC patterns in streams. 20Biogeosciences Discuss., https://doi

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Hourly, daily, and seasonal variability in the absorption spectra of chromophoric dissolved organic matter in a eutrophic, humic lake

et al. 2014

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The short-term (hourly and daily) variation in chromophoric dissolved organic matter (CDOM) in lakes is largely unknown. We assessed the spectral characteristics of light absorption by CDOM in a eutrophic, humic shallow mixed lake of temperate Sweden at a high-frequency (30 min) interval and during a full growing season (May to October). Physical time series, such as solar radiation, temperature, wind, and partial pressures of carbon dioxide in water and air, were measured synchronously. We identified a strong radiation-induced summer CDOM loss (25 to 50%) that developed over 4 months, which was accompanied by strong changes in CDOM absorption spectral shape. The magnitude of the CDOM loss exceeded subhourly to daily variability by an order of magnitude. Applying Fourier analysis, we demonstrate that variation in CDOM remained largely unaffected by rapid shifts in weather, and no apparent response to in-lake dissolved organic carbon production was found. In autumn, CDOM occasionally showed variation at hourly to daily time scales, reaching a maximum daily coefficient of variation of 15%. We suggest that lake-internal effects on CDOM are quenched in humic lake waters by dominating effects associated with imported CDOM and solar exposure. Since humic lake waters belong to one of the most abundant lake types on Earth, our results have important implications for the understanding of global CDOM cycling.

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Higher reactivity of allochthonous vs. autochthonous DOC sources in a shallow lake

Cited by 62 publications

References 60 publications

Seasonal changes in optical properties of two contrasting tropical freshwater systems

Seasonal changes in optical properties of two contrasting tropical freshwater systems

Diel fluctuations of viscosity-driven riparian inflow affect streamflow DOC concentration

Hourly, daily, and seasonal variability in the absorption spectra of chromophoric dissolved organic matter in a eutrophic, humic lake

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