Effect of rain scavenging on altitudinal distribution of soluble gaseous pollutants in the atmosphere

Tov Elperin, Andrew Fominykh, Boris Krasovitov, Alexander Vikhansky

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

We suggest a one-dimensional model of rain scavenging of moderately soluble gaseous pollutants in the atmosphere. It is shown that below-cloud gas scavenging is determined by non-stationary convective diffusion equation with the effective Peclet number. The obtained equation was analyzed numerically in the case of log-normal droplet size distribution. Calculations of scavenging coefficient and the rates of precipitation scavenging are performed for wet removal of ammonia (NH3) and sulfur dioxide (SO2) from the atmosphere. It is shown that scavenging coefficient is non-stationary and height-dependent. It is found also that the scavenging coefficient strongly depends on initial concentration distribution of soluble gaseous pollutants in the atmosphere. It is demonstrated that in the case of linear distribution of the initial concentration of gaseous pollutants whereby the initial concentration of gaseous pollutants decreases with altitude, the scavenging coefficient increases with height in the beginning of rainfall. At the later stage of the rain scavenging coefficient decreases with height in the upper below-cloud layers of the atmosphere.

Original languageEnglish
Pages (from-to)2427-2433
Number of pages7
JournalAtmospheric Environment
Volume45
Issue number14
DOIs
StatePublished - 1 May 2011

Keywords

  • Altitudinal distribution
  • Gas absorption
  • Rain scavenging
  • Scavenging coefficient
  • Soluble gaseous pollutants

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