TRAMP Data Analysis and Radical Chemistry Study
| Project Period: | 04/18/2007 - 11/30/2007 |
| Total Budget: | $85,000 |
| Sub-Contractors: | UH/UCLA/Penn State
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This project analyzed data collected during the TRAMP study using statistical techniques and box modeling with different chemical mechanisms. Major results from the project include the identification of high concentrations of formaldehyde of Ship Channel origin; the quantification of the HCHO/CO ratio in the urban air of Houston, as an indicator of the relative importance of primary versus secondary formaldehyde; the discovery of the importance of HONO to the HOx radical budget; the quantification of the influence of clouds and aerosols on photolysis and ozone chemistry, and the attribution of atmospheric reactivity to various ozone precursors. Major conclusions drawn from the study include:
- Possible heterogeneous formation of HONO associated with rush hour organic aerosol;
- Primary HCHO from mobile sources amounting to 0.7% of CO emissions;
- Significant night-time formation of HCHO from ozone-olefin reactions; and
- Possible downward mixing of elevated plumes of HCHO and sulfur dioxide.
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