The application of data from photochemical assessment monitoring stations to the observation-based model
The observation-base model, which assesses the sensitivity of net ozone production in an urban area to changes in the emissions of nitrogen oxides, VOCs, and carbon monoxide, is described. The model is then used to analyze data gathered during the summer of 1995 from photochemical assessment monitoring stations located in Washington, DC; Bronx, NY; and Houston, TX. The air-chemistry data are used to constrain a coupled set of photochemical box models that calculate the total amount of O3 photochemically produced during the daylight hours at each of the measurement sites, as well as the sensitivity of the O3 photoproduction to changes in the concentrations of the precursor compounds. Data for the three sites were retrieved from the aerometric information retrieval system. The hydrocarbon, CO, and nitric oxide data are outlined. Results show that the sensitivity of O3 production to reductions in anthropogenic hydrocarbons is about 50% smaller than the O3 sensitivity to total hydrocarbons. The results are shown to depend markedly on the measurement sensitivity for afternoon NO concentrations.
Cardelino, CA; Chameides, WL
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