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Retrospective Simulations of TexAQS II-2006 Pollution Events
| Project Period: | 04/07/2007 - 11/30/2007 |
| Total Budget: | $180,000 |
| Sub-Contractors: | University of Houston (UH)
University of North Carolina (UNC)
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This project provided retrospective simulations of TexAQS II-2006 air pollution events using the MM5 meteorological model and both the CMAQ and CAMx air quality models, including development of a Best Effort Model-Ready (BEMR) 2006 emissions inventory based on the TCEQ’s 2006 special point source inventory. Major results of the study include the following:
1) the MM5 simulations were significantly improved over the real time forecast results by Four Dimensional Data Assimilation (FDDA) using the UH Regional Data Assimilation System (UH-RDAS), the Meteorological Assimilation Data Ingest System (MADIS) datasets, CAMS surface measurements, and NOAA WRF-NMM/EDAS inputs;
2) over-predictions of regional ozone sometimes occurred when southerly flows brought in large contributions of ozone and precursors from the model boundaries;
3) when compared with TRAMP measurements, CMAQ with the base emissions significantly over-predicted olefin and ethylene concentrations, while simulation with the updated BEMR emissions showed smaller biases; and
4) the simulated response of Houston ozone to extra inputs of formaldehyde and HONO for a given day in 2006, while still significant, was smaller than the corresponding response for a similar day in 2000, due to the higher PBL heights in 2006, which more rapidly diluted NOx emissions and diminished radical termination, leading to higher ozone productivity.
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| Page Updated/Reviewed: 04/17/2008 9:40 AM |
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