Document Detail

The MAGIC simulation of surface water acidification at, and first year results from, the Bear Brook Watershed Manipulation, Maine, USA.
MedLine Citation:
PMID:  15091969     Owner:  NLM     Status:  PubMed-not-MEDLINE    
The catchments of East and West Bear Brooks, Maine, USA, have been hydrologically and chemically monitored for 3.5 years. Stream chemistries and hydrographs are similar. These clear water streams are low in ANC (0-70 microeq litre(-1)), with variations caused by changing concentrations of base cations, SO4, NO3 and Cl. The latter range between 90-120, 0-40 and 65-75 microeq litre(-1), respectively. The West Bear catchment is being treated with six applications per year of dry (NH4)2SO4 at 1800 eq ha(-1) year(-1). After one year of treatment, the response of the stream chemistry and the response modelled by MAGIC are similar. Retentions of NH4 and SO4 are nearly 100% and greater than 80%, respectively. The additional flux of SO4 is compensated principally by an increased Ca concentration. Episodes of high discharge in the treated catchment are now characterized by lower ANC and pH, and higher Al than prior to the manipulation. Concentrations of NO3 have increased about 10 microeq litre(-1) during the dormant season, presumably due to additional nitrification of N from NH4. Discharge-chemistry relationships indicate that changes in stream chemistry, except for NO3, are dominated by ion exchange reactions in the upper part of the soil profile.
S A Norton; R F Wright; J S Kahl; J P Scofield
Related Documents :
15255479 - Space utilization by a cormorant (phalacrocorax carbo l.) colony in a multi-wetland com...
18278329 - Feeding of oligosarcus hepsetus (cuvier, 1829) (characiformes) in the serra do mar stat...
23701559 - State of the art and perspectives in food allergy (part i): diagnosis.
15525989 - Long-term decline in krill stock and increase in salps within the southern ocean.
9949879 - Multiple stressors in the sacramento river watershed.
12929799 - Pollution of coastal region impacted by acid mine drainage in morphou bay, northern cyp...
14527009 - Practical system to detect and assess consequences of radioactivity in a wound.
7003049 - Selenium: occurrence in foods and its toxicological significance--a review.
20938989 - Biological effects of acrylamide after daily ingestion of various foods in comparison t...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Environmental pollution (Barking, Essex : 1987)     Volume:  77     ISSN:  0269-7491     ISO Abbreviation:  Environ. Pollut.     Publication Date:  1992  
Date Detail:
Created Date:  2004-04-19     Completed Date:  2005-01-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804476     Medline TA:  Environ Pollut     Country:  England    
Other Details:
Languages:  eng     Pagination:  279-86     Citation Subset:  -    
Department of Geological Sciences, University of Maine, Orono, Maine 04469, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

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

Previous Document:  Sensitivity to change for low-ANC eastern US lakes and streams and brook trout populations under alt...
Next Document:  Modelling episodic acidification of surface waters: the state of science.