Mathematical modeling of acid deposition due to radiation fog
- Department of Chemical Engineering and Environmental Quality Laboratory, California Institute of Technology, Pasadena (US)
A Lagrangian model has been developed to study acidic deposition due to radiation fog. The model couples submodels describing the development and dissipation of radiation fog, the gas-phase chemistry and transfer, and the aqueous-phase chemistry. The model is applied to a radiation fog episode in Bakersfield in the San Joaquin Valley of California over the period January 4--5 1985. Model predictions for temperature profile, fog development, liquid water content, gas-phase concentrations of SO{sub 2}, HNO{sub 3}, and NH{sub 3}, {ital p}H, aqueous-phase concentrations of OS{sup 2{minus}}{sub 4}, NH{sup +}{sub 4}, and NO{sup {minus}}{sub 3}, and finally deposition rates of the above ions are compared with the observed values. The deposition rates of the major ions are predicted to increase significantly during the fog episode, the most notable being the increase of sulfate deposition. Pathways for sulfate production that are of secondary importance in a cloud environment may become signficant in a fog. Expressing the mean droplet settling velocity as a function of liquid water content is found to be quite influential in the model's predictions. {copyright} American Geophysical Union 1989
- OSTI ID:
- 5362870
- Journal Information:
- Journal of Geophysical Research; (USA), Vol. 94:D10; ISSN 0148-0227
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACID RAIN
DEPOSITION
AMMONIA
ATMOSPHERIC PRECIPITATIONS
CALIFORNIA
CHEMICAL REACTIONS
CLOUDS
FOG
LAGRANGIAN FUNCTION
MATHEMATICAL MODELS
NITRATES
NITRIC ACID
OXIDATION
PH VALUE
PHASE STUDIES
SULFATES
SULFUR DIOXIDE
WATER
CHALCOGENIDES
FEDERAL REGION IX
FUNCTIONS
HYDRIDES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
RAIN
SULFUR COMPOUNDS
SULFUR OXIDES
USA
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)