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Integration of Multi-platform Modeling Analysis and 2006 Field Measurements to Investigate Ozone Control Sensitivity in the 2005/2006 Houston, TX SIP modeling episodes
| Project Period: | 06/01/2008 - 08/31/2009 |
| Total Budget: | $300,000 |
| Sub-Contractors: | UNC
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The first objective of this project is to produce comparative, process-level descriptions of ozone formation and control sensitivities as represented by existing (or modified existing) CAMx, and/or CMAQ simulations for SIP-relevant episodes in 2000, 2005 and 2006. These simulations will use inputs from two meteorological models: MM5 inputs from TCEQ, UH, and AG simulations; and WRF inputs being produced by TAMU as part of the H96 project and by EPA/NOAA/RTP as part of their in-house study of Houston. Likewise, these simulations will use existing multiple emissions model input files (obtained from TCEQ/EPS, UH/SMOKE, AG/SMOKE, EPA/SMOKE) that may also be slightly modified for sensitivity purposes. Process-level descriptions will be completed for each episode and between and among episodes for similar source receptor relationships situations (e.g., east to west flow as on Aug 25, 2000 and Aug 17, 2006) or for flow from central Houston to the bay, or other common high ozone formation situations. By understanding how the models are arriving at their different predictions, we can generate meaningful sensitivity cases and investigate how the model responds. By illuminating why the model responds, we can generate testable hypotheses and determine what observations are suitable for discriminating among competing formulations or inputs in the models.
The second project objective is to use the above descriptions and analysis products to investigate four special interest questions. These are:
- How does episode meteorology modify the relation among emissions and atmospheric composition and ultimately affect ozone formation processes?
- How does a more complex vertical mixing scheme in the meteorological (WRF-ACM2) and chemical model (CMAQ-ACM2) change the ozone formation and control sensitivity? (2006 only)
- How does new chemistry of gas-phase HONO formation (NO2*+H2O→OH + HONO), as documented by Li et al. (Science, vol. 319, pp. 1657-1660, 2008), impact the radical balance across episodes? For the 2006 episodes, what is the impact of other radical sources that are implied by the Moody Tower observations?
- How does higher grid resolution affect the simulation results for peak ozone formed from intense emissions sources like those associated with HRVOC emission events?
Related Categories
Below is a list of categories that this project belongs to.
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| Page Updated/Reviewed: 08/11/2008 1:43 PM |
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© 2005 - 2008 Texas Environmental Research Consortium
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