||Modeling of Regional-Scale Atmospheric Mercury Transport and Deposition Using RELMAP.
Bullock, O. R. ;
Benjey, W. G. ;
Keating, M. H. ;
||Environmental Protection Agency, Research Triangle Park, NC. National Exposure Research Lab. ;National Oceanic and Atmospheric Administration, Research Triangle Park, NC. Atmospheric Sciences Modeling Div.
Atmospheric models ;
Air pollution ;
Water pollution ;
Computerized simulation ;
Mathematical models ;
Environmental transport ;
Oxidation reduction reactions ;
Heavy metals ;
RELMAP(Regional Lagrangian Model of Air Pollution) ;
Wet deposition ;
||Some EPA libraries have a fiche copy filed under the call number shown.
The Regional Lagrangian Model of Air Pollution (RELMAP) is used to simulate the emission, transport and diffusion, chemical transformation, and wet and dry deposition of elemental mercury gas, divalent mercury gas and particulate mercury. Based on recent modeling advances in Europe, the RELMAP has been modified to simulate a reduction-oxidation (redox) balance for mercury dissolved in cloud and rain water. This redox balance is used in the estimation of a variable precipitation scavenging ratio for elemental mercury. The results of the simulation are used to estimate the quantity of mercury emitted to the air annually over the United States and the amount that is subsequently deposited back to U.S. soils and water bodies. An analysis of the modeling results also provides some information about the areas of the country thought to have the most significant exposure from all air emissions of mercury.