Document Detail

Climate-induced episodic acidification of streams in central ontario.
MedLine Citation:
PMID:  15573600     Owner:  NLM     Status:  MEDLINE    
In this study we have analyzed the hydrochemical effect of drought conditions during 311 hydrological episodes in nine headwater streams in central Ontario over the past 20 years. Acid Neutralization Capacity (ANC) was logarithmically correlated (p<0.05) to antecedent discharge in eight of the nine streams, with the largest decline in ANC occurring after low antecedent flow. In eight of the nine streams SO4(2-) was the most important driving mechanism of ANC decline, but dilution as well as organic acidity was important in several streams. No decrease in the SO4(2-) driven ANC decline was observed over the 20 year study period despite a approximately 40% reduction in SO4(2-) deposition. The strong correlation between ANC decline and low antecedent discharge demonstrates that episodic acidification during rain events is strongly associated with preceding drought conditions, especially in wetland-dominated catchments. The results have important implications for recoveryfrom acidification, especially in northern ecosystems where climate scenarios forecast that warmer and drier conditions will be more common.
H Laudon; P J Dillon; M C Eimers; R G Semkin; D S Jeffries
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  38     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-12-02     Completed Date:  2005-06-16     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6009-15     Citation Subset:  IM    
Department of Forest Ecology, Swedish University of Agricultural Sciences, 901 83 Umeå, Sweden.
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MeSH Terms
Acid Rain* / adverse effects,  analysis
Environmental Monitoring / methods*
Hydrogen-Ion Concentration
Rivers / chemistry
Sulfates / analysis*
Water Movements
Water Pollutants / analysis*
Reg. No./Substance:
0/Acid Rain; 0/Sulfates; 0/Water Pollutants

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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