Long-term trends in the chemistry of precipitation and lake water in the Adirondack region of New York, USA
Conference
·
OSTI ID:617897
- Syracuse Univ., NY (United States); and others
Long-term changes in the chemistry of precipitation (1978-94) and 16 lakes (1982-94) were investigated in the Adirondack region of New York, USA. Time-series analysis showed that concentrations of SO{sub 4}{sup 2-}, NO{sub 3}{sup -}, NH{sub 4}{sup +} and basic cations have decreased in precipitation, resulting in increases in pH. A relatively uniform rate of decline in SO{sub 4}{sup 2-} concentrations in lakes across the region (1.81 +/- 0.35 {mu}eq L{sup -1} yr{sup -1}) suggests that this change was due to decreases in atmospheric deposition. The decrease in lake SO{sub 4}{sup 2-} was considerably less than the rate of decline anticipated from atmospheric deposition. Model calculations suggest that this discrepancy in watershed S budgets may be due either: (1) underestimates of dry deposition of S, or (2) internal release of S from weathering or mineralization of organic S in soil. The discrepancy in watershed S budgets cannot be explained by the release of previously adsorbed SO{sub 4}{sup 2-} from soil. Despite the marked declines in concentrations of SO{sub 4}{sup 2-} in Adirondack lakes, there has been no systematic increase in pH and ANC. The decline in SO{sub 4}{sup 2-} has corresponded with a near stoichiometric decrease in concentrations of basic cations in low ANC lakes. A pattern of increasing NO{sub 3}{sup -} concentrations that was evident in lakes across the region during the 1980`s has been followed by a period of lower concentrations. Currently there are no significant trends in NO{sub 3}{sup -} concentrations in Adirondack lakes.
- OSTI ID:
- 617897
- Report Number(s):
- CONF-970145--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Comparison of terrestrial and hypolimnetic sediment generation of acid neutralizing capacity for an acidic Adirondack lake
The episodic acidification of Adirondack lakes during snowmelt
Empirical Relationships Between Watershed Attributes and Headwater Lake Chemistry in the Adirondack Region
Journal Article
·
Thu Oct 01 00:00:00 EDT 1987
· Environ. Sci. Technol.; (United States)
·
OSTI ID:5245566
The episodic acidification of Adirondack lakes during snowmelt
Journal Article
·
Sun Jul 01 00:00:00 EDT 1990
· Water Resources Research; (United States)
·
OSTI ID:5324622
Empirical Relationships Between Watershed Attributes and Headwater Lake Chemistry in the Adirondack Region
Technical Report
·
Wed Dec 31 23:00:00 EST 1986
·
OSTI ID:814582