Variable trajectory model for regional assessments of air pollution from sulfur compounds.

This report describes a sulfur oxides atmospheric pollution model that calculates trajectories using single-layer historical wind data as well as chemical transformation and deposition following discrete contaminant air masses. Vertical diffusion under constraints is calculated, but all horizontal d...

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Bibliographic Details
Main Authors: Powell, D.C., McNaughton, D.J., Wendell, L.L., Drake, R.L.
Language:unknown
Published: 2011
Subjects:
54 ENVIRONMENTAL SCIENCES
ENVIRONMENTAL TRANSPORT
MATHEMATICAL MODELS
SULFATES
SULFUR DIOXIDE
AIR POLLUTION
CENTRAL REGION
DEPOSITION
FORECASTING
GREAT LAKES REGION
MID-ATLANTIC REGION
MIDWEST REGION
NORTH ATLANTIC REGION
ONTARIO
QUEBEC
RAIN
REGIONAL ANALYSIS
SOUTHEAST REGION
SURFACE AIR
TRAJECTORIES
WIND
AIR
ATMOSPHERIC PRECIPITATIONS
CANADA
CHALCOGENIDES
FLUIDS
GASES
MASS TRANSFER
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
POLLUTION
SULFUR COMPOUNDS
SULFUR OXIDES
Canada
North Atlantic
Online Access:http://www.osti.gov/servlets/purl/6386017
https://www.osti.gov/biblio/6386017
https://doi.org/10.2172/6386017
Description
Summary:This report describes a sulfur oxides atmospheric pollution model that calculates trajectories using single-layer historical wind data as well as chemical transformation and deposition following discrete contaminant air masses. Vertical diffusion under constraints is calculated, but all horizontal dispersion is a funcion of trajectory variation. The ground-level air concentrations and deposition are calculated in a rectangular area comprising the northeastern United States and southeastern Canada. Calculations for a 29-day assessment period in April 1974 are presented along with a limited verification. Results for the studies were calculated using a source inventory comprising 61% of the anthropogenic SO/sub 2/ emissions. Using current model parameterization levels, predicted concentration values are most sensitive to variations in dry deposition of SO/sub 2/, wet deposition of sulfate, and transformation of SO/sub 2/ to sulfate. Replacing the variable mixed-layer depth and variable stability features of the model with constant definitions of each results in increased ground-level concentration predicions for SO/sub 2/ and particularly for sulfate.

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