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Which height limits the vertical dispersion of a plume?

  • A.The tropopause, above which the strong stability prevents any further vertical spreading of the material
  • B.The stack height
  • C.The condensation level, above which the pollutant is removed from the atmosphere by the cloud droplets forming
  • D.The mixing height at the top of the boundary layer

Answer: D

The capping inversion at the top of the boundary layer acts as a lid, and once the plume has spread through the full mixing depth further dilution occurs only horizontally. The mixing height therefore appears directly in the concentration formulae. The tropopause is far too high to be relevant and cloud scavenging removes rather than confines the material. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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