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Main Title Episodic Acidification of Freshwater Systems in Canada: Physical and Geochemical Processes.
Author Tranter, M. ; Davies, T. D. ; Wigington, P. J. ; Eshleman., K. N. ;
CORP Author University of East Anglia, Norwich (England). School of Environmental Sciences. ;Bristol Univ. (England). Dept. of Geography. ;Virginia Univ., Charlottesville. Dept. of Environmental Sciences.;Corvallis Environmental Research Lab., OR.
Publisher c19 Jan 93
Year Published 1993
Report Number EPA/600/J-94/222;
Stock Number PB94-169976
Additional Subjects Canada ; Fresh water ; Acidification ; Water chemistry ; Alkalinity ; Acid neutralizing capacity ; pH ; Aquatic ecosystems ; Surface waters ; Ice ; Acid rain ; Snowmelt ; Rainfall ; Air water interactions ; Hydrologic cycle ; Watersheds ; Reprints ; Episodic acidification ; Acidic deposition ; Physical processes
Library Call Number Additional Info Location Last
NTIS  PB94-169976 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 23p
The occurrence of episodic acidification in Canadian streams, lake waters and shallow groundwaters has been reviewed, and the controlling mechanisms identified. 'Episodes', which are periods of depressed alkalinity during hydrological events, have been studied mainly in southeastern Canada, and occur at all sites where there is sufficient time resolution of the observations, viz. Ontario, Quebec and Nova Scotia. An 'alkaline episode', where acidity decreases during an event, has been reported from one lake in the Canadian Arctic. There is a bias towards the examination of episodes stimulated by snowmelt or rain-on-snow, since rainfall-stimulated episodes are poorly documented. Pre-event, rather than event, water dominates runoff during episodes. For this reason, biogeochemical reactions and the hydrological flowpaths in operation through the vadose and saturated zones are the principal controls on the chemical characteristics of episodes. (Copyright (c) 1994 Kluwer Academic Publishers.)