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Pollution pp 469-476 | Cite as

Profiles of the Natural Contaminant Radon 222 as a Measure of the Vertical Diffusivity

  • Amiram Roffman
Chapter
Part of the Environmental Science Research book series (ESRH, volume 2)

Abstract

The concentrations of atmospheric pollutants are affected to a large extent by the intensity of the vertical transport that is governed by the daily variations of the eddy diffusion. This presentation is a report on a study of the vertical eddy diffusion based upon profiles of the natural contaminant Radon 222. The temporal and spacial variations in Radon 222 concentrations are affected by vertical transport and advection, radioactive decay and Radon 222 emanation from the ground. A number of investigations concerning the use of Radon 222 as a tracer in the study of the vertical transport are reported in the literature. These studies were carried out from both analytical and experimental viewpoints. Among the authors who have treated this subject are Israel (1951), Malakhov (1959), Jacobi and Andre (1963), Wilkening (1970), Birot and Andre (1970), and Roffman (1971). Hosler (1969) derived average vertical diffusion coefficients for thermal inversion and unstable convective periods based upon Radon 222 profiles. It is the purpose of this paper to show that averaging of Radon 222 concentrations over a long period of time is insufficient to represent changes in the vertical diffusivity when thermal inversion dissipates and convection due to ground heating is initiated and that the eddy diffusion coefficient changes by a factor of 20 or more during this period.

Keywords

Radioactive Decay Eddy Diffusion Solenoid Valve Vertical Diffusivity Vertical Transport 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Birot, A., B. Adroguer, and J. Fontan, Vertical Distribution of Radon 222 in the Atmosphere and Its Use for Study of Exchange in the Lower Troposphere, J. Geophys. Res., 75, 2373, 1970.ADSCrossRefGoogle Scholar
  2. Hosier, C. H., Vertical Diffusivity from Radon Profiles, J. Geophys. Res., 74, 7018, 1969.ADSCrossRefGoogle Scholar
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  4. Israel, H., M. Hobert, and C. de La Riva, Measurements of the Radon 222 Concentrations in the Lower Atmosphere in Relation to the Exchange in this Region, Final Technical Report European Research Office, U. S. Army, 1967.Google Scholar
  5. Jacobi, W., and K. Andre, The Vertical Distribution of Radon 222, Radon 220, and Their Decay Products in the Atmosphere, J. Geophys. Res., 68, 3799, 1963.ADSCrossRefGoogle Scholar
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Copyright information

© Springer Science+Business Media New York 1973

Authors and Affiliations

  • Amiram Roffman
    • 1
  1. 1.Environmental Systems DepartmentWestinghouse Electric CorporationPittsburghUSA

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