ATMOSPHERIC TRANSPORT AND DISPERSION OVER CITIES

IN CITIES, ATMOSPHERIC DISPERSION AND TRANSPORT OF POLLUTANTS ARE EFFECTED BY SEVERAL FACTORS THAT ARE NOT PRESENT IN THE NONURBAN ENVIRONMENT, PRINCIPALLY THE ENHANCED SURFACE ROUGHNESS AND HEAT CAPACITY. THE EFFECTS OF THESE ON THE MICROMETEROLOGY OF THE URBAN ATMOSPHERIC BOUNDARY LAYER ARE BRIEFLY SUMMARIZED, AND DIFFUSION MODELS FOR URBAN SOURCES ARE REVIEWED. THE BOUNDARY LAYER OVER A CITY IS USUALLY NEARLY ADIABATIC. DISPERSION IS ENHANCED BY THE INCREASED URBAN ROUGHNESS, ALTHOUGH TRANSPORT BY THE MEAN WIND IS SLIGHTLY DECREASED BY THE AERODYNAMIC DRAG. SUCH REMOVAL PROCESSES AS FALLOUT AND PRECIPITATION SCAVENGING, AS WELL AS CHEMICAL REACTION, ARE BRIEFLY DISCUSSED. /AUTHOR/

  • Corporate Authors:

    Nuclear Safety

    ,    
  • Authors:
    • Gifford, F A
  • Publication Date: 1972-9

Media Info

  • Features: Figures; References;
  • Pagination: p. 391-402
  • Serial:
    • Volume: 13
    • Issue Number: 5

Subject/Index Terms

Filing Info

  • Accession Number: 00240233
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 17 1973 12:00AM