Acidic Precipitation in South-Central Ontario: Recent Observations

Dillon, Peter J.; Jeffries, D. S.; Snyder, Warren R.; Reid, Robert O.; Yan, Norman D.; Evans, Douglas E.; Moss, James R.; Scheider, W. A.

doi:10.1139/f78-130

Cited by 115 publications

(41 citation statements)

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“…The lakes now being studied are sensitive to acidification (Dillon et al, 1978). The photodecomposition of DOC entering them is accelerated by low values of pH (Gennings et al, 2000).…”

Section: Parametermentioning

confidence: 99%

Long-term patterns in dissolved organic carbon in boreal lakes: the role of incident radiation, precipitation, air temperature, southern oscillation and acid deposition

Hudson

Dillon

Somers

2003

Hydrol. Earth Syst. Sci.

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Both lake-specific (e.g. pH) and regional (e.g. precipitation) factors affect DOC concentration and pattern. Using annual DOC concentration in nine boreal lakes in the ice-free season, the potential influences of five regional factors, air temperature, precipitation, SO 4 deposition, solar radiation (photosynthetically active radiation, or PAR) and the southern oscillation index (SOI) have been explored through multiple regression. Mean solar radiation, winter precipitation and summer precipitation explained 59% of the variation in the mean DOC concentration (F 3,17 = 8.29, p = 0.0013). Solar radiation and winter precipitation were correlated, negatively, while summer precipitation was correlated, positively, with DOC concentration. Because these relationships were based on only 21 years of data (1978 to 1998), the significance of the parameters in the regression model was evaluated with a randomisation test. This re-analysis indicated that summer precipitation did not contribute significantly to the regression model (p rand = 0.183). The final multiple regression explained 50% of the variation in DOC (F 2,18 = 9.33, p rand = 0.002) based on solar radiation and winter precipitation. These results suggest that solar radiation and winter precipitation have a significant role in determining long-term DOC concentration in boreal lakes.

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“…The lakes now being studied are sensitive to acidification (Dillon et al, 1978). The photodecomposition of DOC entering them is accelerated by low values of pH (Gennings et al, 2000).…”

Section: Parametermentioning

confidence: 99%

Long-term patterns in dissolved organic carbon in boreal lakes: the role of incident radiation, precipitation, air temperature, southern oscillation and acid deposition

Hudson

Dillon

Somers

2003

Hydrol. Earth Syst. Sci.

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“…Little change in pH will occur until 80 to 90 percent of the bicarbonate has been neutralized (20). One lake in Canada that occupies about 40 percent of an entire watershed has apparently been directly acidified by acid rain (21). However, this direct acidification is usually considered a minor factor relative to acid runoff (2-4, 20, 22).…”

Section: Acidification Of Soil and Watermentioning

confidence: 99%

Acid Rain on Acid Soil: A New Perspective

Krug

Frink

1983

Science

489

181

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Acid rain is widely believed to be responsible for acidifying soil and water in areas of North America and northern Europe. However, factors commonly considered to make landscapes susceptible to acidification by acid rain are the same factors long known to strongly acidify soils through the natural processes of soil formation. Recovery from extreme and widespread careless land use has also occurred in regions undergoing acidification. There is evidence that acidification by acid rain is superimposed on long-term acidification induced by changes in land use and consequent vegetative succession. Thus, the interactions of acid rain, acid soil, and vegetation need to be carefully examined on a watershed basis in assessing benefits expected from proposed reductions in emissions of oxides of sulfur and nitrogen.

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“…The best documented instances are from Norway (Wright and Henriksen 1978), the Adirondack Mountains of the Northeastern U.S. (Schofield 1976), and portions of Ontario (Dillon et al 1978). Acidification of precipitation in the central Rockies is not so extreme as in these three locations, but it is clearly of sufficient severity that it might have affected the chemistry of lakes above 2,000 m.…”

Section: Submittedmentioning

confidence: 99%

Changes in pH and buffering capacity of lakes in the Colorado Rockies

Lewis

1982

Limnology & Oceanography

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A set of pH, alkalinity, and total residue data on lakes in the central Rockies for the period 1938–1960 is compared with a second set of such data taken on the same days of the year in 1979. The total comparison group includes 64 lakes, but some exclusions are made on the basis of water diversions and other complicating factors. A correction is made for variation among years in total runoff. After this correction, there remains a 17% (±2.2%) decline in alkalinity from the early samples to the 1979 samples. The total residue is lower (16%), as is the pH of surface water from the lakes (0.22 units). These changes are attributed to acidification of precipitation, which has been previously documented in the region.

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Acidic Precipitation in South-Central Ontario: Recent Observations

Cited by 115 publications

References 0 publications

Long-term patterns in dissolved organic carbon in boreal lakes: the role of incident radiation, precipitation, air temperature, southern oscillation and acid deposition

Long-term patterns in dissolved organic carbon in boreal lakes: the role of incident radiation, precipitation, air temperature, southern oscillation and acid deposition

Acid Rain on Acid Soil: A New Perspective

Changes in pH and buffering capacity of lakes in the Colorado Rockies

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