Long-range transport of NOy and O3

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Long-range transport of NOy and O3
December 6, 2006
Thomas Walker Dalhousie University Department of
Physics Atmospheric Science
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• DC8
• TD-LIF (NO2, PN's, HNO3)
• SAGA (HNO3)
• O3

• C130
• NOx/NOy/O3
• PAN-CIGARette

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DC8 Campaign Average Vertical Profiles Ozone
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DC8 Campaign Average Vertical NOy Composition
Profile
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C130 Campaign Average Vertical Profiles Ozone
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C130 Campaign Average Vertical NOy Composition
Profile
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Fractional Change in Model Due to Change in Asian
Emissions
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Fractional Change in Model Due to Turning Off
Asian Emissions
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Lightning's Contribution
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Comparison to Ozone Monitoring Instrument (OMI)
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OMI compared to model
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• Summary
• O3 in model biased 5-10 ppb low relative to
  aircraft
• O3 columns in model low relative to OMI
• Significant contributions from lightning and
  Asian transport
• HNO3 in model biased high relative to aircraft
• HNO3 profile in model sensitive to changes in
  Asian emissions
• Future Work
• Further decomposition of O3 columns biomass
  burning, local srcs
• Comparison of model NO2 to OMI
• Examine potential HNO3 sinks uptake on dust

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Thank You for listening!
Special thanks to Atmospheric Chemistry Analysis
Group Randall Martin Bastien Sauvage Rong-Ming
Hu Lok Lamsal Betty Croft Aaron van
Donkelaar Neil Moore Gray O'Byrne Balagopal
Pillai
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References

• Jacob, D. Introduction to Atmospheric Chemistry.
  Princeton University Press, 1999.
• Martin, R.V. et al. Space-based constraints on
  the production of nitric oxide by lightning.
  Submitted to JGR, 2006.
• Hudman, R.C. et al. Surface and lightning
  sources of nitrogen oxides over the United
  States magnitudes, chemical evolution, and
  outflow. Submitted to JGR, 2006.

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DC8 Vertical Profiles NOx
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DC8 Vertical Profiles HNO3
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DC8 Vertical Profiles PNs
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C130 Vertical Profiles NOx
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C130 Vertical Profiles HNO3
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C130 Vertical Profiles PNs
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Increase in Asian NO2 columns observed from
GOME/SCIAMACHY
Ref Richter et al. 2005.
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OMI compared to standard model
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• Motivation
• Modelling
• Introduction to GEOS-CHEM
• Comparison of measurements to standard model
• Description of model experiments
• Results from model experiments
• Satellite
• Comparison of model to OMI Ozone
• Summary and future directions