Advanced Statistical Trajectory Regional Air Pollution model
The Advanced Statistical Trajectory Regional Air Pollution (ASTRAP) model is developed and shown to combine efficient calculation of long-term horizontal dispersion with improved parameterizations of boundary-layer processes. The parameterizations include diurnal and seasonal variations of dry deposition velocities for SO/sub 2/ and sulfate, the rate of transformation from SO/sub 2/ to sulfate, and te vertical structure of the planetary boundary layer. The deposition velocity variations simulate some recent experimental results that indicate that the deposition velocity of sulfate particles is of the same order as that for gaseous SO/sub 2/, not an order of magnitude less as usually modeled. The stability variations simulate the cycle of nocturnal inversion formation, intensification and deepening, rise and erosion from below, and dissipation, as frequently observed in field investigations of the planetary boundary layer. An additional improved parameterization is the treatment of wet deposition as a function of the half power of the hourly precipitation, an empirical result. Budget studies in ASTRAP indicate that wet removal is greater than dry deposition within U.S. boundaries for sources within the U.S., particularly during winter, and that the net mass flux across the U.S.-Canadian border resulting from U.S. sources is 3 to 4 times greater than the net mass flux across the border resulting from Canadian sources.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6291250
- Report Number(s):
- ANL/RER-79-1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AIR POLLUTION
MATHEMATICAL MODELS
SULFATES
DEPOSITION
SULFUR DIOXIDE
ATMOSPHERIC CHEMISTRY
BOUNDARY LAYERS
CHEMICAL REACTIONS
DAILY VARIATIONS
EARTH ATMOSPHERE
ENVIRONMENTAL TRANSPORT
ISOLATED VALUES
REGIONAL ANALYSIS
SEASONAL VARIATIONS
THEORETICAL DATA
USA
CHALCOGENIDES
CHEMISTRY
DATA
DATA FORMS
INFORMATION
LAYERS
MASS TRANSFER
NORTH AMERICA
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
POLLUTION
SULFUR COMPOUNDS
SULFUR OXIDES
VARIATIONS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)