Monitoring the results of Canada/U.S.A acid rain control programs: some lake responses

Environmental Monitoring and Assessment - Tập 88 Số 1 - Trang 3-19 - 2003
Jeffries, D.S.1, Brydges, T.G.2, Dillon, P.J.3, Keller, W.4
1National Water Research Institute, Environment Canada, Burlington, Canada
2Faculty of Environmental Studies, York University, Toronto, Canada
3Environmental and Resource Studies, Trent University, Peterborough, Canada
4Ontario Ministry of the Environment, Cooperative Freshwater Ecology Unit, Laurentian University, Sudbury, Canada

Tóm tắt

Aquatic acidification by deposition of airborne pollutants emerged as an environmental issue in southeastern Canada during the 1970s. Drawing information from the extensive research and monitoring programs, a sequence of issue assessments demonstrated the necessity of reducing the anthropogenic emissions of acidifying pollutants, particularly sulphur dioxide (SO2). The 1991 Canada-U.S. Air Quality Agreement (AQA) was negotiated to reduce North American SO2 emissions by ∼40% relative to 1980 levels by 2010, and at present, both countries have reduced emissions beyond their AQA commitment. In response to reduced SO2 emissions, atmospheric deposition of sulphate (SO4 2−) and SO4 2− concentrations in many lakes have declined, particularly in south-central Ontario and southern Québec. Sulphate deposition still exceeds aquatic critical loads throughout southeastern Canada however. Increasing pH or alkalinity (commonly deemed ‘recovery’) has been observed in only some lakes. Several biogeochemical factors have intervened to modify the lake chemistry response to reduced SO4 2− input, notably release of stored SO4 2− from wetlands following periods of drought and reduction in the export of base cations from terrestrial soils. Three examples from Ontario are presented to illustrate these responses. Significant increases in pH and alkalinity have been observed in many lakes in the Sudbury area of Ontario due to the large reductions in local SO2 emissions; ‘early-stage’ biological recovery is evident in these lakes. An integrated assessment model predicts that AQA emission reductions will not be sufficient to promote widespread chemical or biological recovery of Canadian lakes. Monitoring and modeling are mutually supporting assessment activities and both must continue.

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Environmental Monitoring and Assessment

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