Wet-removal study of air pollutants using a one-dimensional transport/transformation/removal model
Thesis/Dissertation
·
OSTI ID:6154577
A one-dimensional scavenging model has been developed and compared to field data of sequential sampling of ground level precipitation rates and chemical compositions of precipitation. Field results from convective showers and frontal precipitations obtained by Dawson (1978) and Asman (1987) which clearly indicate the variation of pollutant rain concentrations during a rain event, are compared with model output. The sequences for modeling these rain events are that the precipitation rates are matched followed by modeling the pollutant rain concentrations. Nucleation scavenging by cloud water in the in-cloud region dominates the removal of submicrometer particles; inertial impaction by raindrops in the below-cloud region dominates the removal of coarse particles. The major scavenging mechanisms of NH/sub 4/ and NO/sub 3/ are gas absorption. The contribution of (NH/sup 4/)/sub 2/SO/sub 4/ scavenging to the NH/sub 4/ rain concentration is also important, whereas the NH/sub 4/ rain concentration is not sensitive to the type of concentration profile of NH/sub 3/ in the below-cloud region. The absorption of SO/sub 2/ by aqueous drops and oxidation of S(IV) by O/sub 3/ and H/sub 2/O/sub 2/ in the aqueous phase is the major formation and scavenging mechanism for SO4.
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, NY (USA)
- OSTI ID:
- 6154577
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
AMMONIUM COMPOUNDS
ATMOSPHERIC CHEMISTRY
ATMOSPHERIC PRECIPITATIONS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMISTRY
CLOUDS
ECOLOGICAL CONCENTRATION
ENVIRONMENTAL TRANSPORT
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
MASS TRANSFER
MATHEMATICAL MODELS
NITRATES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
OZONE
PEROXIDES
POLLUTION
PRECIPITATION SCAVENGING
RAIN
SEPARATION PROCESSES
SULFATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
AMMONIUM COMPOUNDS
ATMOSPHERIC CHEMISTRY
ATMOSPHERIC PRECIPITATIONS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMISTRY
CLOUDS
ECOLOGICAL CONCENTRATION
ENVIRONMENTAL TRANSPORT
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
MASS TRANSFER
MATHEMATICAL MODELS
NITRATES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
OZONE
PEROXIDES
POLLUTION
PRECIPITATION SCAVENGING
RAIN
SEPARATION PROCESSES
SULFATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES