Increasing trends of total organic carbon concentrations in small forest lakes in Finland from 1987 to 2003

Vuorenmaa, Jussi; Forsius, Martin; Mannio, Jaakko

doi:10.1016/j.scitotenv.2006.02.038

Cited by 158 publications

(145 citation statements)

References 50 publications

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“…The second is how the fact of using data obtained with different methods within the same study series is dealt with and what effects this has on the trends reported. Sometimes authors mention that the methods used have been intercalibrated for a period of time (e.g., [39,57,75]) but not all authors report intercalibration (e.g., [36,38,48,59] do not). It is worth mentioning the case of [39] who studied OC trends with and without correcting old wet persulfate data and obtained quite different results (Table 3).…”

Section: Organic Carbon Concentration Measurementsmentioning

confidence: 99%

“…Concerning methodological issues, some studies follow tendencies directly in the surrogate parameter as such [26,60,61,65,72,77] but a common practice is to establish an empirical correlation between the parameter values and OC concentrations using data simultaneously measured over a short period of time [29,38,48,50,53,61] and discuss tendencies, causes, etc. in terms of OC concentrations.…”

Section: Organic Carbon Concentration Measurementsmentioning

confidence: 99%

“…It also suggests a bias towards favoring systems with high DOC concentrations, which usually means northern humic-type ones. Since some authors [14,37,48,62,69] observed that trends are correlated with initial concentration levels, it is clear that, in practice, not considering low concentrations introduces a bias towards the measurement of higher trends. On the other end of the spectrum, de Wit et al [52] wrote: "samples with exceptionally high TOC concentrations (>18 mg C L −1 ) were excluded from the dataset" because "TOC in these samples had been modified by in-stream processes rather than being products of soil processes", reasoning difficult to understand when studying OC behavior in natural systems.…”

Section: Data Censoringmentioning

confidence: 99%

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Long-term Trends of Organic Carbon Concentrations in Freshwaters: Strengths and Weaknesses of Existing Evidence

Filella

Rodríguez-Murillo

2014

Water

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Many articles published in the last few years start with the assumption that the past decades have seen an increase in dissolved organic carbon (DOC) concentrations in the rivers and lakes of the Northern Hemisphere. This study analyses whether the existing evidence supports this claim. With this aim, we have collected published studies where long series of organic carbon concentrations (i.e., longer than 10 years) were analyzed for existing trends and have carefully evaluated the 63 articles found. Information has been collated in a comprehensive and comparable way, allowing readers to easily access it. The two main aspects considered in our analysis have been the analytical methods used and the data treatment methods applied. Both are sensitive issues because, on the one hand, the difficulties associated with correctly determining organic carbon concentrations in surface waters are well known, while, on the other, dealing with real environmental data (i.e., lack of normality, censoring, missing values, etc.) is an extremely intricate matter. Other issues such as data reporting and the geographical location of the systems studied are also discussed. In conclusion, it is clear that organic carbon concentrations have increased in some surface waters in the Northern Hemisphere since the 1990s. However, due to a lack of data in many parts of the world, it is not known whether this phenomenon is general and, more importantly, in the areas for which such data do exist, the reporting and methodological problems in the published studies prevent any conclusion on the existence of a general temporal behavior of organic carbon from being drawn.

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Section: Organic Carbon Concentration Measurementsmentioning

confidence: 99%

Section: Organic Carbon Concentration Measurementsmentioning

confidence: 99%

Section: Data Censoringmentioning

confidence: 99%

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Long-term Trends of Organic Carbon Concentrations in Freshwaters: Strengths and Weaknesses of Existing Evidence

Filella

Rodríguez-Murillo

2014

Water

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“…The Plastic Lake catchment has been extensively monitored since the late 1970s and has been previously described (bulk precipitation: Dillon et al, 1988;forest throughfall: Neary and Gizyn, 1994;soil: Lozano, 1987;Watmough and Dillon, 2004;forest biomass: Lozano and Parton, 1987;Watmough and Dillon, 2004). Stream discharge and chemistry has been measured for the PC1 sub-catchment since 1979(PC1-08: 1986.…”

Section: Study Sitementioning

confidence: 99%

The impacts of future climate change and sulphur emission reductions on acidification recovery at Plastic Lake, Ontario

Aherne

Futter

Dillon

2008

Hydrol. Earth Syst. Sci.

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Abstract. Climate-induced drought events have a significant influence on sulphate export from forested catchments in central Ontario, subsequently delaying the recovery of surface waters from acidification. In the current study, a model chain that employed a statistical downscaling model, a hydrological model and two hydrochemical models was used to forecast the chemical recovery of Plastic Lake sub-catchment 1 (PC1) from acidification under proposed deposition reductions and the A2 emission scenario of the Intergovernmental Panel on Climate Change. Any predicted recovery in stream acid neutralising capacity and pH owing to deposition reductions were clearly offset by large acid effluxes from climateinduced drought events. By 2100, ANC is predicted to show large variations ranging between 10 and −30 µmol c L −1 . Similarly, predicted pH in 2100 is lower (>0.05 of a pH unit) than the value simulated for 2000 (pH 4.35). Despite emission reductions, the future scenario paints a bleak picture of reacidification at PC1 to levels commensurate with those of the late 1970s. The principal process behind this reacidification is the oxidation of previously stored (reduced) sulphur compounds in wetlands during periods of low-flow (or drought), with subsequent efflux of sulphate upon rewetting. Simulated catchment runoff under the A2 emissions scenario predictes increased intensity and frequency of lowflow events from approximately 2030 onwards. The Integrated Catchments model for Carbon indicated that stream DOC concentrations at PC1 will also increase under the future climate scenario, with temperature being the principal driver. Despite the predicted (significant) increase in DOC, pH is not predicted to further decline (beyond the climateinduced oxidation scenario), instead pH shows greater variability throughout the simulation. As echoed by many recent studies, hydrochemical models and model frameworks need to incorporate the drivers and mechanisms (at appropriCorrespondence to: J. Aherne (julian.aherne@ucd.ie) ate time-scales) that affect the key biogeochemical processes to reliably predict the impacts of climate change.

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“…Among these are: the area of lake catchment, the land cover in the catchment, the area of the lake, winter and summer precipitation, the time of snowmelt, and other climatic factors. Hence, there is no common pattern in seasonal changes in DOC concentration in humic lakes (Pace & Cole, 2002;Vuorenmaa et al, 2006). Nevertheless, some evidence from central Europe showed that the maximal DOC concentration in any lake may be reached in May or June (Górniak et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

The influence of glucose and peat extract additions on the spring recruitment of Gonyostomum semen from the sediments

2014

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The effect of two various forms of DOC on the Gonyostomum semen recruitment from sediments was conducted under experimental laboratory conditions. We tested the hypothesis that DOC is a factor enhancing spring recruitment of the species by exposing sediments from a humic lake with a 17-year bloom history, to three various DOC additions (two solutions of glucose and one solution of a peat extract). Sediments and lake water were incubated for 14 days at 16°C, in 14:10 h light:dark cycle, with germling and adult cell abundance ascertained in the water every third day, and water parameters every seventh day. Our important findings were that (1) Gonyostomum recruitment was uneven and the period of germination was relatively short; (2) all treatments significantly affected germling occurrence; however, sugar-derived DOC seemed to suppress the recruitment, whereas peat extract improved it. Due to the additional phosphorus load in peat treatment (against phosphorus-free sugar treatments), it is likely that it played a major role in the observed differences, however, our results did not exclude the potential role of peatderived DOC forms. In conclusion, we proposed that Gonyostomum expansion is supported by enhanced recruitment from sediment seed banks related to water chemistry alterations, driven by the climate change.

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Increasing trends of total organic carbon concentrations in small forest lakes in Finland from 1987 to 2003

Cited by 158 publications

References 50 publications

Long-term Trends of Organic Carbon Concentrations in Freshwaters: Strengths and Weaknesses of Existing Evidence

Long-term Trends of Organic Carbon Concentrations in Freshwaters: Strengths and Weaknesses of Existing Evidence

The impacts of future climate change and sulphur emission reductions on acidification recovery at Plastic Lake, Ontario

The influence of glucose and peat extract additions on the spring recruitment of Gonyostomum semen from the sediments

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