Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Model Calculations of the Annual Atmospheric Deposition of Toxic Metals to Lake Michigan.
Author Clark, T. L. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. ;National Oceanic and Atmospheric Administration, Research Triangle Park, NC. Atmospheric Sciences Modeling Div. ;Computer Sciences Corp., Research Triangle Park, NC.
Publisher 1992
Year Published 1992
Report Number EPA/600/A-92/234;
Stock Number PB93-120905
Additional Subjects Air water interactions ; Water pollution ; Deposition ; Air pollution ; Metals ; Mathematical models ; Study estimates ; Lake Michigan ; Toxic substances ; Atmospheric models ; Great Lakes ; Spatial distribution ; Water quality ; Concentration(Composition) ; Urban areas ; Clean Air Act ; Forecasting ; Regional Lagrangian Model of Air Pollution
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
NTIS  PB93-120905 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/08/1993
Collation 12p
The 1990 Clean Air Act Amendments include specific provisions to study significant sources of atmospheric deposition of toxic substances and their impacts on the health and welfare of the Great Lakes and other major water bodies. The act also requires an assessment of the atmospheric loadings to the Great Lakes and other major water bodies. However, because of cost and technological limitations, spatially-integrated atmospheric deposition to a body of water can not be directly determined. Until recently, the total annual atmospheric deposition was estimated from the product of (1) spatially-limited, land-based, rural air concentrations, (2) constant theoretical or empirical atmospheric removal rates, and (3) the surface area of the water body. Although it is expedient, this approach, with its inherent assumptions, has several serious drawbacks that cast doubts on the spatially-integrated atmospheric loadings. Comprehensive atmospheric deposition models based on future enhanced versions of currently-available regional air pollution models offer a more accurate alternative to this traditional approach. However, since a better understanding of the emission rates and atmospheric processes governing airborne toxic deposition is a prerequisite for the enhanced model versions, these comprehensive models will not be operational within the next several years. In the interim, the Regional Lagrangian Model of Air Pollution (RELMAP), a simple atmospheric deposition model, was applied to quantify the expected range of annual deposition amounts of toxic trace metals to Lake Michigan. These metals are arsenic (As), cadmium (Cd), chromium (Cr), lead (Pb), and nickel (Ni).