An unsteady two-dimensional transport model is constructed to study the short-term effects of urbanization and air pollution on the thermal structure and dispersion in an urban atmosphere. The model includes horizontal and vertical advection as well as turbulent diffusion and radiative transfer in the planetary boundary layer (PBL). The gaseous and particulate pollutants as well as the natural constituents in the atmosphere absorb, emit, and anisotropically scatter radiation. The variation of the physical properties of the soil, the radiation characteristics of the earth’s surface, and the urban heat and pollutant emissions along the city are modeled. A number of numerical simulations for summer conditions modeling a typical Midwestern city are performed and the effects of various parameters arising in the problem have been investigated. The diurnal variation of the temperature structure and pollutant concentrations are discussed. It was found that the temperature changes caused by radiatively participating pollutants are generally smaller than the effects induced by urbanization. A maximum urban heat island of approximately 3°C was predicted and found to be in good agreement with observations.
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Modeling of Temperature and Pollutant Concentration Distributions in Urban Atmospheres
R. Viskanta,
R. Viskanta
Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, Ind.
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R. O. Johnson,
R. O. Johnson
Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, Ind.
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R. W. Bergstrom, Jr.
R. W. Bergstrom, Jr.
Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, Ind.
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R. Viskanta
Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, Ind.
R. O. Johnson
Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, Ind.
R. W. Bergstrom, Jr.
Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, Ind.
J. Heat Transfer. Nov 1976, 98(4): 662-669 (8 pages)
Published Online: November 1, 1976
Article history
Received:
December 12, 1975
Online:
August 11, 2010
Citation
Viskanta, R., Johnson, R. O., and Bergstrom, R. W., Jr. (November 1, 1976). "Modeling of Temperature and Pollutant Concentration Distributions in Urban Atmospheres." ASME. J. Heat Transfer. November 1976; 98(4): 662–669. https://doi.org/10.1115/1.3450617
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