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Impact of Soil NOx Emission Uncertainty on Tropospheric NO2 Modeling Bias

Investigating how uncertainty in soil NOx emission affects modeled tropospheric NO2 columns. Findings show modification of soil NOx emission parameterization influences bias in different regions. Discoveries suggest more complex measures are needed to reduce overall simulation bias over North America.

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Impact of Soil NOx Emission Uncertainty on Tropospheric NO2 Modeling Bias

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  1. Does uncertainty of soil NOx emission explain the bias of modeling tropospheric NO2 columns? Chun Zhao EAS 6792 Earth&Atmospheric Science, Georgia Tech

  2. Figure 1 Tropospheric NO2 columns from satellite measurements and model simulation. Earth&Atmospheric Science, Georgia Tech

  3. Figure 2 Anthropogenic NOx emission. Earth&Atmospheric Science, Georgia Tech

  4. Figure 3 standard soil NOx emission. Earth&Atmospheric Science, Georgia Tech

  5. Figure 4 Tropospheric NO2 columns from satellite measurements and simulations. Earth&Atmospheric Science, Georgia Tech

  6. Figure 3 standard soil NOx emission. Earth&Atmospheric Science, Georgia Tech

  7. Figure 5 Soil type map for part of North America. 0 is for water and desert; 1 is for tropical forest; 2 is for agriculture; 3 is for grassland&shrub; 4 is for other soil type. Earth&Atmospheric Science, Georgia Tech

  8. Earth&Atmospheric Science, Georgia Tech

  9. Figure 6 Soil condition (wet or dry) map except agriculture for North America in July 2004. Earth&Atmospheric Science, Georgia Tech

  10. Figure 7 Soil NOx emission with increased dry soil NOx emission. Earth&Atmospheric Science, Georgia Tech

  11. Figure 8 Tropospheric NO2 columns from satellite measurements and simulations. Earth&Atmospheric Science, Georgia Tech

  12. Summary • The uncertainty of soil NOx emission parameterization is large. The increased dry soil NOx emission fluxes for soil except agriculture did reduce the bias in western US, however, it increased the bias in North Dakata, South Dakata, Montana, and Wyoming. So It seems that this simply modification of soil NOx emission parameterization is not in perfect way to reduce the overall bias of simulated NO2 columns over North America. Earth&Atmospheric Science, Georgia Tech

  13. Thank you! Earth&Atmospheric Science, Georgia Tech

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