Document Detail

Long-term relationships between SO2 and NOx emissions and SO4(2-) and NO3- concentration in bulk deposition at the Hubbard Brook Experimental Forest, NH.
MedLine Citation:
PMID:  16193167     Owner:  NLM     Status:  MEDLINE    
A highly significant second-order polynomial relation between SO(2) emissions and SO(4)(2-) concentrations during 1970-2000 (r(2)= 0.80, p= <0.001), and a linear relation between NO(x) and NO(3)(-) concentrations during 1991-2000 (r(2)= 0.67, p= 0.004) in bulk precipitation were found for the Hubbard Brook Experimental Forest, NH based on emissions from a 24 h, back-trajectory determined source area. Earlier periods (1965-1980) for SO(2)ratio SO(4)(2-) and longer periods (1965-2000) for NO(x)ratio NO(3)(-) had poorer linear relations, r(2)= 0.03, p= 0.51 and r(2)= 0.22, p= 0.004, respectively. Methodology by the US Environmental Protection Agency for calculating emissions data during this period has changed significantly and frequently, making trend analysis difficult. Given the large potential for errors in estimating emissions and to a lesser extent, deposition, the robust relations between SO(2) emissions and SO(4)(2-) concentrations in bulk precipitation at the Hubbard Brook Experimental Forest show that careful, long-term measurements from a single monitoring site can provide sound and reasonable data on trends in air pollution.
Gene E Likens; Donald C Buso; Thomas J Butler
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2005-08-08
Journal Detail:
Title:  Journal of environmental monitoring : JEM     Volume:  7     ISSN:  1464-0325     ISO Abbreviation:  J Environ Monit     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2005-09-29     Completed Date:  2006-01-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100968688     Medline TA:  J Environ Monit     Country:  England    
Other Details:
Languages:  eng     Pagination:  964-8     Citation Subset:  IM    
Institute of Ecosystem Studies, P.O. Box AB, 65 Sharon Turnpike, Millbrook, New York, NY 12545, USA.
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MeSH Terms
Acid Rain*
Air Pollutants / chemistry*
Environmental Monitoring
Nitrates / chemistry*
Nitrogen Oxides / chemistry*
Retrospective Studies
Sulfates / chemistry*
Sulfur Dioxide / chemistry*
United States
United States Environmental Protection Agency
Reg. No./Substance:
0/Acid Rain; 0/Air Pollutants; 0/Nitrates; 0/Nitrogen Oxides; 0/Sulfates; 7446-09-5/Sulfur Dioxide

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