Document Detail

What have we learned from highly time-resolved measurements during EPA's Supersites Program and related studies?
MedLine Citation:
PMID:  18318343     Owner:  NLM     Status:  MEDLINE    
A wide range of new and exciting highly time-resolved instruments were deployed during the U.S. Environmental Protection Agency (EPA) Supersite program and related studies that occurred during the same time period. These measurements elucidated the temporal variation of a suite of gas-phase species, particle physical properties, and size-resolved particulate chemical composition. Because the temporal resolution was so high, concentration and size distribution changes as short as 1 min or less were discerned. Often data from multiple instruments were correlated with each other and with meteorological measurements, and these correlations enabled conclusions to be drawn about the photochemical activity of the atmosphere, the location of point sources, and even the emissions characteristics of these sources. For instance, rapid changes in particulate matter (PM) concentration were due to meteorological conditions, emissions, and plume excursions that led to increases in nitrate, sulfate, and organic carbon concentrations. This paper summarizes the conclusions that have been reached, to date, using these new, highly time-resolved instruments, and demonstrates their promise for future studies.
Anthony S Wexler; Murray V Johnston
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of the Air & Waste Management Association (1995)     Volume:  58     ISSN:  1096-2247     ISO Abbreviation:  J Air Waste Manag Assoc     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-03-05     Completed Date:  2008-04-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9503111     Medline TA:  J Air Waste Manag Assoc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  303-19     Citation Subset:  IM    
Department of Mechanical and Aeronautical Engineering, University of California, Davis, CA 95616, USA.
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MeSH Terms
Environmental Remediation / statistics & numerical data*
Models, Statistical
Particulate Matter / analysis*
Time Factors
United States
United States Environmental Protection Agency
Reg. No./Substance:
0/Particulate Matter

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