Inefficient scavenging of aerosol sulfate by non-precipitating clouds in polluted air

  • Dutkiewicz V
  • Husain L
  • 4


    Mendeley users who have this article in their library.
  • 7


    Citations of this article.


We present measurements of the scavenging efficiency (β) of aerosols bearing Se and As (mass median diameter around 0.5 μm) by non-precipitating clouds associated with large frontal systems. The measurements were made during July 1995 and September-October 1993 at Whiteface Mountain summit. The site was influenced by highly polluted (based on aerosol loadings) as well as relatively clean air masses. Scavenging efficiency varied from 0.48 to 0.89; however, most values fell between 0.55 and 0.65. The highest values were associated with clouds where the pre-cloud aerosol SO4concentration was < 5 μgm-3,mean β of 0.78 ± 0.06 compared to 0.60 ± 0.05 when SO4concentration was > 5 μgm-3. We also demonstrate that β based on SO4, the most common aerosol used in earlier scavenging studies, can be biased high due to contributions of SO4in the cloud water from oxidation of dissolved SO2.

Author-supplied keywords

  • Aerosols
  • Clouds
  • Pollution
  • Selenium
  • Sulfate

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


  • Vincent A. Dutkiewicz

  • Liaquat Husain

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free