Evaluation of the ability of indicator species ratios to determine the sensitivity of ozone to reductions in emissions of volatile organic compounds and oxides of nitrogen in northern California

Autor: Liang, Jinyou1, Jackson, Bruce1, Kaduwela, Ajith1,2 akaduwel@arb.ca.gov
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Zdroj: Atmospheric Environment. Sep2006, Vol. 40 Issue 27, p5156-5166. 11p.
Abstrakt: Abstract: Six indicator ratios were evaluated for their regulatory application in California using three-dimensional (3-D) photochemical transport modeling output for an ozone episode during 31 July–2 August 2000. The evaluation was based on four criteria with increasing usefulness for 8-h ozone controls. The four criteria can be briefly described as: (1) smooth functional behavior between ozone benefits/disbenefits and the magnitude of the indicator ratio, (2) narrow separation between beneficial and detrimental regimes for oxides of nitrogen (NO x ) emissions controls, (3) narrow transition regime between where volatile organic compound controls are more beneficial than NO x controls and vice versa, and (4) invariance of these transition ranges in time and space. None of the indicator ratios met all criteria. We present results for five sub-regions in northern California. The transition regime for criteria (3) was found to be much wider than that for criteria (2) for all sub-regions. Hence, the indicator ratios may be of only limited usefulness in determining precursor limitations and might be more valuable in diagnosing if NO x controls are beneficial or detrimental. [Copyright &y& Elsevier]
Databáze: GreenFILE
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