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    
Abstract/OtherAbstract:
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.
Authors:
S A Norton; R F Wright; J S Kahl; J P Scofield
Related Documents :
20009269 - Deep-sea palaeoceanography of the maldives islands (odp hole 716a), equatorial indian o...
19954789 - Corneal fibropapillomatosis in green sea turtles (chelonia mydas) in australia.
23261699 - Gold nanoparticles-peptide based gas sensor arrays for the detection of food aromas.
22924879 - An optofluidic sers microsystem for sensitive and repeatable on-site detection of chemi...
24136559 - Immunoproteomics analysis of food allergens.
11833489 - Organochlorine and butyltin residues in walleye pollock (theragra chalcogramma) from be...
12031059 - Safety pharmacology in the nonclinical assessment of new medicinal products: definition...
15788109 - Dissociation of the glycaemic and insulinaemic responses to whole and skimmed milk.
21210179 - Influence of the landscape matrix on the abundance of arboreal primates in fragmented l...
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:  -    
Affiliation:
Department of Geological Sciences, University of Maine, Orono, Maine 04469, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

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.