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Gas and aerosol scavenging [electronic resource].

Published
Columbus, Ohio : Battelle Memorial Institute, 1979.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 28 : digital, PDF file
Additional Creators
Battelle Memorial Institute and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The wet removal rate and wet deposition of pollutants is ultimately dependent upon the rate of pollutant attachment to the falling precipitation particles (hydrometeors) and to the precipitation flux at the ground. This attachment to the hydrometeors or collector particles is, in turn, dependent upon the physical characteristics of the pollutant. As expected, when considering wet removal, gases behave differently from aerosols. Modelers of gas scavenging (e.g., Hales 1972, Adamowitz 1979) stress the importance of drop size distribution, vertical gradients of gas concentration in the atmosphere and solubility in determining gas deposition at the surface. Aerosols, on the other hand, are removed at various rates depending upon aerosol size distribution, solubility, environmental humidity and age. Before the specifics of wet removal are dealt with, it is helpful to present some of the basic mathematical concepts used for treating problems in precipitation scavenging. By doing so, current terminology can be introduced and placed into a framework that should alleviate confusion about meaning. For example, a distinction between scavenging coefficients and simply scavenging will be made. The terminology in-cloud, below-cloud, washout, and rainout are shown to be ambiguous and will be dismissed. Other concepts, such as washout ratio, nucleation scavenging, vapor deposition versus accretion are shown to be more appropriate or useful when considering wet removal of aerosol and gas. Gas and aerosol removal are considered in general. For each, the emphasis is upon surface deposition, and upon properties that must be known to approximate wet surface fluxes. In the final section, the suspected properties of organics and metals are presented and related to wet removal.
Report Numbers
E 1.99:pnl-sa-8170
E 1.99: conf-7911105-1
conf-7911105-1
pnl-sa-8170
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
12/01/1979.
"pnl-sa-8170"
" conf-7911105-1"
Workshop on toxic substances in precipitation, Jekyll Island, GA, USA, 13 Nov 1979.
Scott, B.C.
Funding Information
AC06-76RL01830
View MARC record | catkey: 14149874