||Radiative effects of pollutants on the planetary boundary layer /
Venkatram, A. ;
||Purdue Univ., Lafayette, Ind. School of Mechanical Engineering.;Environmental Sciences Research Lab., Research Triangle Park, N.C.
|| Environmental Sciences Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,
Radiation effects. ;
Air pollution ;
Urban areas ;
Thermal radiation ;
Mathematical models ;
Atmospheric diffusion ;
Solar radiation ;
Boundary layer ;
Atmospheric temperature ;
Planetary boundary layer ;
Atmospheric boundary layer ;
Urban heat islands ;
Inadvertent weather modification ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||xviii, 244 pages : illustrations ; 28 cm.
The objective of this study was to gain a better understanding of the effects of pollutants on the thermal structure and pollutant dispersal in the planetary boundary layer. To this end numerical models of the boundary layer were constructed. Gaseous pollutants in the boundary layer were considered to absorb and emit thermal radiation, while aerosols were allowed to absorb and scatter solar energy. First, a one-dimensional numerical model of the boundary layer was constructed. The model used the two-stream method for the computation of radiative fluxes, and a turbulent kinetic energy model to account for turbulence. A series of numerical experiments were performed to determine the role of pollutants in modifying thermal structure and pollutant dispersal in the boundary layer. The results showed that the predominant influence of gaseous and particulate pollutants on surface temperature was warming. The second phase of the study involved the construction of a two-dimensional numerical model to study the effects of pollutants on urban-rural differences in thermal structure and pollutant dispersal. The effects of pollutants on pollutant dispersal were found to be significant.
Project Officer: James T. Peterson. United States Environmental Protection Agency "July 1976." "EPA-600/4-76-039." Also available from the National Technical Information Service (NTIS) as PB257707. Microfiche.