. Annual program report, 1989. Acidic Precipitation in Ontario Study; Acid precipitation (Meteorology); Acid pollution of rivers, lakes, etc; Acid rain. AQUATIC EFFECTS STUDIES Contact: W. Keller - 27 A. CHEMICAL STUDIES Calibrated Watersheds a. Chemical Limnology The Limnology Section Resources Branch has monitored a set of 20 lakes in the Muskoka (Figure 22). Data co cover periods of 7 to Researchers use these measure the long-term acid deposition and t inputs on the chemist of the study lakes. of the Water intensively streams and 8 Haliburton area llected now 13 years. data to effects of ra
. Annual program report, 1989. Acidic Precipitation in Ontario Study; Acid precipitation (Meteorology); Acid pollution of rivers, lakes, etc; Acid rain. AQUATIC EFFECTS STUDIES Contact: W. Keller - 27 A. CHEMICAL STUDIES Calibrated Watersheds a. Chemical Limnology The Limnology Section Resources Branch has monitored a set of 20 lakes in the Muskoka (Figure 22). Data co cover periods of 7 to Researchers use these measure the long-term acid deposition and t inputs on the chemist of the study lakes. of the Water intensively streams and 8 Haliburton area llected now 13 years. data to effects of race metal ry and biology. Figure 22. Location of the study area and regions (shaded) of high SO2 and NOj( emissions. In the past few years, the relative contribution of nitric acid to precipitation acidity in eastern Canada has increased. As a result, researchers have become concerned about the potential deleterious effects of nitrate deposition on terrestrial and aquatic ecosystems. To gauge the extent of this impact, annual mass balances for nitrates and ammonium were calculated for several forested catchments and lakes in Ontario. The analysis of nitrogen retention suggests that nitrogen saturation of lakes and watersheds has not occurred at present nitrogen loadings in eastern Canada, although there may be exceptions in specific stream catchments. Increased nitrate deposition will result, however, in higher concentrations of nitrate and greater acidity in stream and lake waters, while decreased deposition should result in increased alkalinities. Another study analysed alkalinity decreases during snowmelt in 1984-86 for 15 headwater streams and lake outflows in three central Ontario catchments. These depressions were likely to be dominated by sulphate increases as the degree of stream acidification increased. Neither nitrate nor organic acid anions were significant contributors to alkalinity Please note that these images are extracted from scanned page images th
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