Thermal and trophic stability of deeper Maine lakes in granite waterhsheds implacted by acid deposition

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Water Resources Research; (United States)

DOI:https://doi.org/10.1029/90WR00203· OSTI ID:5411189

Stauffer, R E; Wittchen, B D ^[1]

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1. Univ. of Maine, Orono (USA)

Acid deposition can lead to lake and watershed acidification, increases in lake transparency, and reduction in thermal stability and hypolimnetic oxygen deficits. On the basis of lake surveys during August-September 1985, we determined to what extent the deeper (maximum depth z{sub m}{gt}17 m) Maine lakes in acid-sensitive granitic watersheds have registered changes in temperature and oxygen stratification, as compared to 1938-1942, when G.P. Cooper performed the earliest scientific surveys of the state's lakes. After correcting for small but geographically consistent interannual differences in summer hypolimnetic temperatures related to spring turnover, and weather-dependent differences in mixed layer depth, there has been no significant change in thermal stratification in these Maine lakes over approximately 43 years. On the basis of specific historical contrasts in the late summer metalimnetic, hypolimnetic, and bathylimnetic oxygen concentrations there has been no significant change in lake trophic state or transparency.

• OSTI ID: 5411189
• Journal Information: Water Resources Research; (United States), Journal Name: Water Resources Research; (United States) Vol. 26:9; ISSN 0043-1397; ISSN WRERA
• Country of Publication: United States
• Language: English

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