Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Dry deposition flux calculations for the National Dry Deposition Network {MICROFICHE} /
Author Clarke, J. F. ; Edgerton, E. S.
CORP Author Environmental Science and Engineering, Inc., Durham, NC.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher Environmental Science and Engineering Co, for US Environmental Protection Agency, Atmospheric Research and Exposure Laboratory,
Year Published 1993
Report Number EPA-68-02-4451; EPA/600/R-93/065
Stock Number PB93-178242
Subjects Ozone--Measurement
Additional Subjects Ozone ; Air pollution sampling ; Acidification ; Deposition ; United States ; Sulfates ; Nitrates ; Nitric acid ; Sulfur dioxide ; Meteorology ; Seasonal variations ; Environmental transport ; Atmospheric diffusion ; Mathematical models ; Tables(Data) ; Graphs(Charts) ; National Dry Deposition Network ; Flux calculations
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
NTIS  PB93-178242 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/01/1988
Collation 100 p. : ill. ; 28 cm.
The National Dry Deposition Network (NDDN) was established in 1987 to document the magnitude, spatial variability, and trends in dry deposition of ozone and acidic particles and gases across the United States. Currently, the network consists of 50 stations: 41 in the eastern United States and 9 in the western United States. The NDDN will be assimilated into the Clean Air Status and Trends Network (CASTNet). Dry deposition is not measured directly in the NDDN, but is determined by an inferential approach, i.e., dry deposition fluxes are calculated as the product of measured ambient concentration and modeled deposition velocity. Chemical species include O3, sulfate, nitrate, sulfur dioxide, and nitric acid. The temporal resolution for the dry deposition calculations is hourly for O3 and weekly for the acidic particles and gases. The report describes the dry deposition calculation method used in the NDDN/CASTNet program and presents dry deposition data for the network for 1990 and 1991. Sources of uncertainty in the calculations are discussed.
"EPA 600/R-93/065."