Difference between revisions of "Scavenging by precipitation"

From Glossary of Meteorology
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<div class="definition"><div class="short_definition">Removal of [[pollutants]] from the air by either [[rain]] or [[snow]].</div><br/> <div class="paragraph">Rainout (or snowout), which is the in-cloud capture of [[particulates]] as [[condensation nuclei]],  is one form of scavenging. The other form 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 &#x003bc;m in diameter) more easily follow the  airstream flowing around raindrops and generally avoid capture by raindrops except in [[heavy rain]]  events.</div><br/> </div>
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<div class="definition"><div class="short_definition">Removal of [[pollutants]] from the air by either [[rain]] or [[snow]].</div><br/> <div class="paragraph">Rainout (or snowout), which is the in-cloud capture of [[particulates]] as [[condensation nucleus|condensation nuclei]],  is one form of scavenging. The other form 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 &#x003bc;m in diameter) more easily follow the  airstream flowing around raindrops and generally avoid capture by raindrops except in [[heavy rain]]  events.</div><br/> </div>
 
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Latest revision as of 17:50, 25 April 2012



scavenging by precipitation

Removal of pollutants from the air by either rain or snow.

Rainout (or snowout), which is the in-cloud capture of particulates as condensation nuclei, is one form of scavenging. The other form 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 μm in diameter) more easily follow the airstream flowing around raindrops and generally avoid capture by raindrops except in heavy rain events.