Abstract
Purpose
Increases in dissolved organic carbon (DOC) concentrations have been reported in surface waters worldwide in the last 10 to 20 years. The causes behind these increases have been attributed to many factors, including climate change and decreasing depositions of atmospheric sulphate (\( {\text{SO}}_4^{{{2} - }} \)). Trends in DOC concentrations and their potential causal factors were examined in a network of 30 lakes lying in undisturbed temperate and boreal catchments in the province of Quebec, Canada.
Methods
Temporal trends in lake DOC concentrations were analysed with the seasonal Kendall test. For each lake, the variation in DOC concentration over time was assessed in light of the variation in \( {\text{SO}}_4^{{2 - }} \) concentration in precipitation, air temperature, precipitation and solar radiation using the forward stepwise multiple regression.
Results
Between 1989 and 2006, significant increases in DOC were observed in most of the lakes, the mean rate of change being 0.05 mg L−1 year−1. Lake DOC concentrations were significantly explained by different models that yielded a variance explanation ranging from 13% to 77%. The models included long-term temperature variables (i.e. averaged over intervals of 10 years), short-term precipitation variables (i.e. summed over intervals 6 months), radiation (i.e. ice-free period prior to the DOC observation) and precipitation \( {\text{SO}}_4^{{2 - }} \) concentration as explanatory variables.
Conclusion
Temporal changes in DOC concentrations seem more consistent with the evolution of climate parameters rather than \( {\text{SO}}_4^{{2 - }} \) concentrations despite the fact that most lakes were in the process of recovery, showing increases in pH.
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Acknowledgements
This study was funded by Environment Canada. The authors thank the Quebec Laboratory for Environmental Testing of Environment Canada for the analyses. Special thanks go to Michel Arseneau for help with the fieldwork and Pierre Gagnon for support with statistical analysis.
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Couture, S., Houle, D. & Gagnon, C. Increases of dissolved organic carbon in temperate and boreal lakes in Quebec, Canada. Environ Sci Pollut Res 19, 361–371 (2012). https://doi.org/10.1007/s11356-011-0565-6
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DOI: https://doi.org/10.1007/s11356-011-0565-6