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Most of eastern North America receives elevated levels of atmospheric deposition of sulfur (S) that result from anthropogenic SO2 emissions from fossil fuel combustion. Atmospheric S deposition has acidified sensitive terrestrial and aquatic ecosystems in this region; however, deposition has been declining since the 1970s, resulting in some recovery in previously acidified aquatic ecosystems. Accurate...
The UN ECE definition of critical load (CL) involving protection of aquatic ecosystem structure and function was adopted by using pH 6.0 as a damage threshold. Critical loads were determined for 4 lake clusters in SE Canada. An Integrated Assessment Model (IAM) was used to estimate steady-state lake pH distributions for each cluster for steps of wet sulphate (SO 42- ) deposition...
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