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Asian Outflow Chemistry: Ozone and Nitrogen Oxides Evolution Across the Pacific

Explore O3-HOx-NOx system behavior, source contributions, GEOS-CHEM vs. observations, model comparisons, and more.

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Asian Outflow Chemistry: Ozone and Nitrogen Oxides Evolution Across the Pacific

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  1. Asian outflow and chemical evolution of ozone and nitrogen oxides over the Pacific Mathew Evans, Daniel Jacob, Harvard Group, TRACE-P Science Team et al.

  2. Questions • How well do we understand the behavior of the O3-HOx-NOx system in Asian outflow? • What is the relative contribution of different sources on O3 and nitrogen oxides in Asian outflow over the Pacific?

  3. GEOS CHEM vs observations Model sampled along flight tracks Outputs concentrations and rates

  4. Comparison of model and GOME NO2 preliminary slant column K Chance, T Kurosu Smithsonian Astrophysical Observatory R.V. Martin, P.I. Palmer, Harvard

  5. Comparison of model and GOME CH2O preliminary slant column

  6. Model and observed O3 West Mid North South Model / Measurements

  7. Model and observed NO West Mid North South Model / Measurements

  8. Model and observed OH West Mid North South Model / Measurements

  9. NOy to CO Anthropogenic vs Biomass burning sources North South

  10. O3 - PAN relationshipModel versus observations (color = Latitude) High latitude Boundary layer Low latitude Free troposphere

  11. Impact of anthro. emissionson March NOxFractional decrease in NOx when anthropogenic emissions are shut off Fractional decrease in NOx concentration

  12. Impact of anthro. emissions on March O3 Decrease in concentration when anthropogenic emissions are shut off Difference in O3 concentration (ppbv)

  13. O3 model / observed ensemble of TRACE-P data and sensitivity simulations

  14. Preliminary conclusions • Distribution of NOx observed during TRACEP is consistent with our understanding of combustion sources • Large O3 anthropogenic enhancement in boundary layer Asian outflow with destruction during aging over Pacific. • Free tropospheric O3 in Asian outflow has comparable sources from anthropogenic, biomass burning and lightning • Large model overestimate of HOx and H2O2 and CH2O??? • Mystery VOC source over Hainan???

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