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Impact of Updates to On-Road Mobile Source Emission Factor Models (EMFAC) for the Los Angeles Region: Ozone Model Sensitivity and Ambient/Inventory Reconciliation. Final rept.
| 题名： | Impact of Updates to On-Road Mobile Source Emission Factor Models (EMFAC) for the Los Angeles Region: Ozone Model Sensitivity and Ambient/Inventory Reconciliation. Final rept. |
| 作者： | Yarwood-G.; Tran-C.; Lau-S.; Fujita-E. |
| 关键词： | *Air-pollution-monitoring; *Ozone-; *Mobile-pollutant-sources.;Air-quality-measurements; Ambient-data; Exhaust-emissions; Inventories-; Model-sensitivity; Model-reconciliation; Volatile-organic-compounds; Emission-reductions; Vehicle-air-pollution; Modeling-. |
| 摘要： | The CRC-A38 study evaluates whether improvements to the on-road vehicle emission inventories for Los Angeles have improved agreement between ozone models and ambient data, and whether the response of ozone models to emission reductions has been altered by the emission inventory updates. Past studies, such as the 1987 SCAQS field study, raised concerns that VOC emissions from vehicles were under-represented in the Los Angeles emission inventories. When the SCAQMD modeled an August 26-28, 1987 ozone episode from the SCAQS for the 1997 AQMP, the on-road vehicle VOC emissions were doubled in order to obtain acceptable model performance for ozone. On-road vehicle emission inventories for Los Angeles are based on computer models called EMFAC developed by the California Air Resource Board (ARB). Numerous revisions to EMFAC have been released since the 1987 SCAQS field study with the most recent version being EMFAC2002. Most of the revisions increased ozone precursor (VOC, NOx and CO) emissions, although there were some decreases after EMFAC2000. Over the same time period, the measured atmospheric concentrations of ozone precursors have steadily decreased in the Los Angeles area. The changes in modeled and measured precursor levels both might be expected to improve agreement between the models and the real world for ozone precursors. |
| 报告类型： | 科技报告 |
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