Photochemical Smog Modeling of Urban Airshed

1
Photochemical Smog Modeling of Urban Airshed

• by
• Mrs Zhang Baoning
• Mr. Liu Qishan

2
Basic Equations

• Box model equation

3
Chemical Reaction Submodel

• Atmospheric photochemical reactions for
  simulation model

4
Calculation for R

• aij is 1 if species I is a reactant, -1 if it
  is a product, and 0 if not present
• Cj1 and Cj2 are the reactant concentrations in
  reaction j
• kj is the specific reaction rate constant for
  j.

5
R values for compounds
6
Calculation for intermediate compound
concentrations
7
Model input data

• Reaction rate constant
• Source strength
• Upwind pollutant concentration
• Wind speed
• Mixing height
• Dimension of some area

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Rate constants for photochemical reactions
1/(ppm?hour)
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Emission inventory in the area
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Other input data

• Upwind pollutant concentrations 0.01ppm
• Wind speed 4m/s
• Mixing height H--t curve
• Photolysis rate k1--t curve
• traffic emission R--t curve
• Dimension L310km W230km

11
Comparison of results

• Calculation results
• O3 --- t curve
• NO --- t curve
• NO2--- t curve

• Observed concentrations
• O3 --- t curve
• NO --- t curve
• NO2 --- t curve