Trends in hydrometeorological conditions and stream water organic carbon in boreal forested catchments

Sarkkola, Sakari; Koivusalo, Harri; Laurén, Ari; Kortelainen, Pirkko; Mattsson, Tuija; Palviainen, Marjo; Piirainen, Sirpa; Starr, Michael; Finér, Leena

doi:10.1016/j.scitotenv.2009.09.008

Cited by 108 publications

(70 citation statements)

References 36 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%

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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%

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

Filella

Rodríguez-Murillo

2014

Water

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“…However, based on soil water data from southern Sweden, the postulated causal link between recovery from anthropogenic acidification and increases in surface water DOC has been challenged (Löfgren et al 2010b;Löfgren and Zetterberg 2011). Instead, the data indicate that climatic drivers, including precipitation, temperature, and changes in hydrological flow patterns, are the most important factors affecting surface water DOC concentrations (Erlandsson et al 2008;Sarkkola et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Recovery of Soil Water, Groundwater, and Streamwater From Acidification at the Swedish Integrated Monitoring Catchments

Löfgren

Aastrup

Bringmark

et al. 2011

AMBIO

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Recovery from anthropogenic acidification in streams and lakes is well documented across the northern hemisphere. In this study, we use 1996-2009 data from the four Swedish Integrated Monitoring catchments to evaluate how the declining sulfur deposition has affected sulfate, pH, acid neutralizing capacity, ionic strength, aluminum, and dissolved organic carbon in soil water, groundwater and runoff. Differences in recovery rates between catchments, between recharge and discharge areas and between soil water and groundwater are assessed. At the IM sites, atmospheric deposition is the main human impact. The chemical trends were weakly correlated to the sulfur deposition decline. Other factors, such as marine influence and catchment features, seem to be as important. Except for pH and DOC, soil water and groundwater showed similar trends. Discharge areas acted as buffers, dampening the trends in streamwater. Further monitoring and modeling of these hydraulically active sites should be encouraged.

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“…Long-term changes in DOC concentrations occur in surface waters; for instance, an increasing trend has been observed in Europe (Sarkkola et al 2009, Chapman et al 2010, Pärn & Mander 2012 as well as in Eastern North America (Findlay 2005, Couture et al 2012. There are several possible explanations for this.…”

Section: Doc and Dic Fluxes (Long-term Trends In Doc Fluxes)mentioning

confidence: 99%

Connecting silvan and lacustrine ecosystems: transport of carbon from forests to adjacent water bodies

Rasilo¹

2013

Diss. For.

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Trends in hydrometeorological conditions and stream water organic carbon in boreal forested catchments

Cited by 108 publications

References 36 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

Recovery of Soil Water, Groundwater, and Streamwater From Acidification at the Swedish Integrated Monitoring Catchments

Connecting silvan and lacustrine ecosystems: transport of carbon from forests to adjacent water bodies

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