OLS : Record

RECORD NUMBER: 48 OF 1438

Main Title Acidic Gases and Aerosols in the Eastern and Western United States.
Author Edgerton, E.; Martin, B. E.;
CORP Author Environmental Science and Engineering, Inc., Durham, NC.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher 1992
Year Published 1992
Report Number EPA-68-02-4451; EPA/600/A-92/275;
Stock Number PB93-131696
Subjects Aerosols; Gases; Acidity; Air pollution sampling; Deposition; Long term effects; United States; Concentration(Composition); Graphs(Charts); US EPA; Data base management; Sulfates; Sulfur dioxide; Nitric acid; Eastern Region(United States); Western Region(United States); National Dry Deposition Network
Holdings
Library   Call Number Additional Info Location Date Modified
NTIS PB93-131696 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/12/1993
Collation 11p
Abstract The USEPA National Dry Deposition Network (NDDN) is designed to provide long-term estimates of acidic gas and aerosol concentrations, and associated fluxes, across the continental United States. Inspection of data collected since 1988 shows species-dependent variability in atmospheric concentrations from site to site, season to season and year to year. In general, gas and aerosol concentrations were much higher (factor of 2-10) at eastern sites than western sites. Data for 25 eastern sites operational from 1988 through 1991 suggest that SO4(-2) concentrations have been essentially constant. In contrast, SO2 and HNO3 appear to have decreased, on average, by about 20 percent and 15 percent, respectively. Examination of sub-regional concentration patterns shows marked variability in areas of complex terrain. Data from a ridgetop site and a nearby base elevation site in southwestern North Carolina show that reactive gas concentrations, but not aerosol concentrations, are 2-3 times higher at ridgetop than at base elevation. Elevational gradients thus need to be accounted for in analysis of large-scale concentration patterns.
Supplementary Notes Sponsored by Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Category Codes 68A; 91A
NTIS Prices PC A03/MF A01
Primary Description 600/09
Document Type NT
Control Number 305026735
Cataloging Source NTIS/MT
Origin NTIS
Type CAT