Setting threshold values of particle sizes for determination of the appropriate dispersion/deposition model during various atmospheric stability conditions

Alon Mandel, Eli Stern, Amos Ullmann, Neima Brauner

Research output: Contribution to journalArticlepeer-review

Abstract

An approach is suggested for the estimation of air borne critical particle diameter that determines the dominant removal mechanism from atmospheric dispersion of plumes for six main Pasquill-Gifford meteorological stability conditions. A methodology was developed to apply in rural regions since relevant meteorological input data have been developed mainly for such areas. Our critical diameter methodology refines the commonly accepted "50 micron diameter", considered as a border value above which gravitational settling is dominant and below which, turbulent dispersion is expected to prevail. The interrelationships of particle release heights and downwind deposition distances (for various stability conditions) as well as particle sizes and densities are implemented in the turbulent dispersion and gravitational settling estimations, in order to determine the dominant mechanism for particles reaching the ground following their releases from various heights.

Original languageEnglish
Pages (from-to)181-190
Number of pages10
JournalAtmospheric Environment
Volume105
DOIs
StatePublished - 1 Mar 2015

Keywords

  • Atmospheric diffusion
  • Atmospheric stability
  • Gravitational settling
  • Risk assessment

Fingerprint

Dive into the research topics of 'Setting threshold values of particle sizes for determination of the appropriate dispersion/deposition model during various atmospheric stability conditions'. Together they form a unique fingerprint.

Cite this