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Calibrating NO2 Emissions using Western Power
Plants

• Jim Gleason (NASA Goddard)
• S.-W. Kim, G. J. Frost, S. McKeen, E.-Y. Hsie, M.
  Trainer
• (NOAA ESRL/CSD)
• A. Heckel, A. Richter, J. Burrows
• (U Bremen)
• Submitted to JGR

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Four Corners/San Juan Power Plants
Power Plant City
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Four Corners/San Juan Emissions
Power Plants have continuous emission data. Data
available from EPA (CEMS)
Hourly Data
Jan Jun 2008 28,816.9 NOx tons 26,197.2 NOx tonnes
Daily Emission Data June to August 2005
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Use Daily CEMS data in WRF Chem
WRF Chem
OMI
July 2, 2005
July 4, 2005
July 6, 2005
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Western Power Plant Results
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WRF Chem w/CEMS vs Satellite NO2
OMI
SCIA
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Power Plants and Cities Observed
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OMI NO2 over Cities
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WRF Chem Emissions Overestimate NO2
Use NEI99 in WRF Chem. Have CA emissions
changed 1999 2005?
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California Cities Show decrease in NO2
Fuel use increase NOx emission factors decrease
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Conclusions
Model and measurements agree when accurate
emissions are used. Top-Down emission techniques
validated. California NOx emissions in NEI 99
are 50 too high for 2005 NEI99
higher than CARB 99 CA NOx decrease consistent
with CA fuel based estimates. Need a better
process for updating emission data Future Use
OMI to observe NOx emissions on smaller scales
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Questions
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Western City NO2 Trends
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Western Fuel Use Changes
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Western NOx Emission Changes
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Western Power Plants
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Western Cities
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SCIA over Four Corners/San Juan
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OMI SCIA over Western Cities
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OMI and SCIA over LA