Sensitivity Distributions of Finnish Lakes

  • Martin Forsius
Conference paper

Summary

A regional lake survey of 987 randomly selected lakes was conducted during autumn overturn 1987 as part of the Finnish national research project on acidification (HAPRO). The median pH of the lakes was 6.3, median alkalinity 75 eq l−1, and median base cation concentration 250 µeq l−1. About 88 percent of the lakes were humic (TOC > 5 mg l−1); the median TOC for all lakes was 12 mgl−1. The humic lakes were on an average more acid than the clear-watered lakes. More than 10 percent of the lakes had negative Gran alkalinity. Sulfate concentrations were highest in southern Finland, commonly being more than 100 peg l−1. Several sensitive areas affected by acidic deposition were identified, and acidic and low-ANC lakes were found throughout the country. Inclusion of the organic anion component in the estimation of sensitivity markedly increased the number of lakes potentially susceptible to acidic deposition.

Keywords

Total Organic Carbon Organic Anion Base Cation Sensitivity Distribution Humic Lake 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer-Verlag Berlin Heidelberg 1989

Authors and Affiliations

  • Martin Forsius
    • 1
  1. 1.Water and Environment Res. Inst.HelsinkiFinland

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