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RAIN WASH-OUT [1 record]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-07-12

English

Subject field(s)
  • Air Pollution
  • Atmospheric, Climatic and Meteorological Phenomena
DEF

The removal of solid and gaseous material from the air and its deposition on the earth's surface due to capture by falling precipitation.

CONT

Washout and rainout are the removal processes associated with precipitation and are the most efficient atmospheric cleansing mechanisms. Rainout refers to the process of removal by precipitation from within the cloud while washout is the removal of pollutants from the air layer below clouds by falling precipitation.

CONT

Wet deposition - Collectively, the processes by which materials are removed from the atmosphere and deposited at the surface of the earth by precipitation elements. The processes include in-cloud and below-cloud scavenging of both gaseous and particulate materials.

OBS

The other form [of scavenging] is washout, the below-cloud capture of particulates and gaseous pollutants by falling raindrops. Large particles are most efficiently removed by washout. Small particles (especially those less than 1 m in diameter) more easily follow the airstream flowing around raindrops and generally avoid capture by raindrops except in heavy rain events.

Key term(s)
  • below cloud scavenging
  • wash out
  • rain wash-out
  • rain wash out

French

Domaine(s)
  • Pollution de l'air
  • Phénomènes météorologiques, climatiques et atmosphériques
DEF

Mécanisme d'élimination des polluants de l'atmosphère qui se produit quand des polluants, qui se trouvent entre un nuage et le sol, sont déposés au sol par une précipitation.

CONT

L'aérosol de sulfate et le dioxyde de soufre peuvent être enlevés par dépôt humide, celui-ci correspond soit à un lavage, soit à un processus d'incorporation des polluants dans les gouttes d'eau des nuages (rain-out).

CONT

D'autres facteurs météorologiques comme les précipitations peuvent avoir une action directe sur la diminution des concentrations de polluants par lavage ou simple entraînement.

CONT

La composante humide globalise les effets dus à la pluie d'une manière directe par un lessivage de l'air (wash-out) ou indirect lorsque les polluants ont été absorbés par les gouttelettes d'eau nuageuse (rain-out).

Spanish

Campo(s) temático(s)
  • Contaminación del aire
  • Fenómenos meteorológicos, climáticos y atmosféricos
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