||Routine estimation and reporting of dry deposition for the U.S.A. dry deposition network /
Clarke, John F. ;
Edgerton, E. ;
Boksleitner, R. P.
||National Oceanic and Atmospheric Administration, Research Triangle Park, NC. Atmospheric Sciences Modeling Div. ;Environmental Science and Engineering, Inc., Durham, NC.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
|| U.S. Environmental Protection Agency, Office of Research and Development, Atmospheric Research and Exposure Assessment Laboratory,
Acid deposition--United States.
Dry methods ;
Air pollution ;
United States ;
Study estimates ;
Temporal distribution ;
Mathematical models ;
Nitric acid ;
Sulfur dioxide ;
Spatial distribution ;
National Dry Deposition Network
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||14 pages : illustrations, maps ; 28 cm
A National Dry Deposition Network (NDDN) was established in the United States during 1986 to document the magnitude, spatial variability, and trends in dry deposition of ozone and acidic particles and gases. Currently, the network consists of 50 stations: 41 in the eastern United States and 9 in the western United States. Dry deposition is not measured directly in the NDDN, but is estimated by an inferential approach, i.e., fluxes are calculated as the product of measured ambient concentration and modeled deposition velocity. The temporal resolution for the dry deposition calculations is weekly. Chemical species include ozone, sulfate, nitrate, ammonium, sulfur dioxide and nitric acid. Preliminary dry deposition calculations yielded the following observations: (1) calculated values of dry deposition for colocated sites are in good agreement suggesting good network precision, and (2) spatial patterns of SO2 and HNO3 dry deposition are consistent with emission patterns.
Caption title. "EPA/600/D-91/248." Microfiche.