Record Display for the EPA National Library Catalog

RECORD NUMBER: 39 OF 147

OLS Field Name OLS Field Data
Main Title Episodic Acidification of Adirondack Lakes during Snowmelt.
Author Schaefer, D. A. ; Driscoll, C. T. ; Van Dreason, R. ; Yatsko, C. P. ;
CORP Author Syracuse Univ., NY. Dept. of Civil and Environmental Engineering.;Corvallis Environmental Research Lab., OR.
Publisher cJul 90
Year Published 1990
Report Number EPA/600/J-90/435;
Stock Number PB91-177162
Additional Subjects Acidification ; Lakes ; Snowmelt ; Concentration(Composition) ; Watersheds ; Water chemistry ; Baseline measurements ; Hydrology ; Water pollution ; Surface waters ; Mathematical models ; Air water interactions ; Hydrogeology ; Runoff ; Reprints ; Acid neutralizing capacity ; Adirondack Region(New York)
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Status
NTIS  PB91-177162 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/04/1991
Collation 7p
Abstract
Maximum values of acid neutralizing capacity (ANC) in Adirondack, New York lake outlets generally occur during summer and autumn. During spring snowmelt, transport of acidic water through acid-sensitive watersheds causes depression of upper lake water ANC. In some systems lake outlet ANC reaches negative values. The authors examined outlet water chemistry from II Adirondack lakes during 1986 and 1987 snowmelts. In these lakes, SO concentrations were diluted during snowmelt and did not depress ANC. For lakes with high baseline ANC values, springtime ANC depressions were primarily accompanied by basic cation dilution. For lakes with low baseline ANC, No increases dominated ANC depressions. Lakes with intermediate baseline ANC were affected by both processes and exhibited larger ANC depressions. Ammonium dilution only affected wetland systems. A model predicting a linear relationship between outlet water ANC minima and autumn ANC was inappropriate. To assess watershed response to episodic acidification, hydrologic flow paths must be considered. (Copyright (c) 1990 by the American Geophysical Union.)