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| Air Quality Research |
| Title: | Diagnostic Modeling and Data Analysis of the Summer 2005 Northeast Texas Plume Study (NETPS) |
| Project Period: | 12/01/2005 - 08/31/2006 |
| Total Budget: | $80,000 |
| Sub-Contractors: | University of Alabama
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This project is a follow-up of the 2005 NETPS field campaign co-funded by TERC and TCEQ. In that study, three groups of point sources were the subject of chemically and meteorologically instrumented aircraft investigations to determine their impact on ozone non-attainment in the Dallas-Ft. Worth (DFW) area. Sources in Zone A were in Ellis County, sources in Zone B were to the southeast of DFW, and sources in Zone C were to the east of DFW. All these sources were within 250 km of the DFW urban core.
Meteorological conditions prevailing during the August, 2005 NETPS did not conform to climatologically-based expectations, and thus there were fewer cases than expected of large point source plumes contributing to ozone above 85 ppb in the DFW area. Never-theless, there were several highly useful measurements that were obtained that can be used to improve the DFW 8-hour ozone SIP, particularly for Zones A and B.
Plumes from Zone A sources in particular were observed to contribute to ozone peaks aloft downwind and northeast/northwest of the DFW urban core (see attached figures). According to EPA‘s current 8-hour ozone modeling guidance, an 8-hour SIP should anticipate ozone exceedances that are not detected by the current surface monitoring network. The high ozone plumes aloft detected during NETPS may have been associated with undetected ozone exceedances at the ground. The contractor will conduct analyses using the Lagrangian Reactive Plume Model (LRPM), MM5 forecasts and retrospective analyses for August, 2005 (to be provided by Texas A&M University), and NETPS aircraft observations to determine whether or not such exceedances likely occurred, and the degree to which plumes in Ellis County may have contributed to such exceedances.
The contractor will also analyze NETPS data pertinent to point sources outside Zone A to calibrate the LRPM for application to a historical DFW 2000 ozone episode based on plume measurements made during TexAQS 2000 by NOAA’s P3 aircraft, and to determine any corrections needed to the most current DFW emissions inventory. The analysis of the 2000 episode will deterrmine the contributions of various point sources in Zones A, B, and C to ozone above 85 ppb in the DFW non-attainment area. The findings will be compared to the APCA results obtained in TERC Project H27, as appropriate.
Related Documents
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| Page Updated/Reviewed: 11/30/2006 5:28 PM |
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