An extensive set of chemical and physical measurements was made at the La Porte Airport in Houston during the 2000 Texas Air Quality Study. Observed hydroxyl and hydroperoxyl radical concentrations ([OH] and [HO2]) at La Porte are compared to those predicted by a steady state box model. The model is constrained by ambient measurements of ozone, reactive nitrogen compounds, carbon monoxide, volatile organic compounds, photolysis rate coefficients, and meteorological variables. The photochemical production rate of ozone (P(O3)) due to HO2 is derived from the observed [HO2] and nitric oxide concentration ([NO]) and compared to the model. Budgets of OH and HO2 are quantified using the model. Model-measurement comparisons of [OH], [HO2], [HO2]/[OH], and P(O3) are further evaluated by considering their dependence on variables such as [NO] and actinic flux. The results of this study are put into a broader context by including results from the 1999 Southern Oxidants Study in Nashville.

Model-Measurement Comparisons of [OH], [HO2], and P(O3) in Houston

DI CARLO, PIERO;
2002-01-01

Abstract

An extensive set of chemical and physical measurements was made at the La Porte Airport in Houston during the 2000 Texas Air Quality Study. Observed hydroxyl and hydroperoxyl radical concentrations ([OH] and [HO2]) at La Porte are compared to those predicted by a steady state box model. The model is constrained by ambient measurements of ozone, reactive nitrogen compounds, carbon monoxide, volatile organic compounds, photolysis rate coefficients, and meteorological variables. The photochemical production rate of ozone (P(O3)) due to HO2 is derived from the observed [HO2] and nitric oxide concentration ([NO]) and compared to the model. Budgets of OH and HO2 are quantified using the model. Model-measurement comparisons of [OH], [HO2], [HO2]/[OH], and P(O3) are further evaluated by considering their dependence on variables such as [NO] and actinic flux. The results of this study are put into a broader context by including results from the 1999 Southern Oxidants Study in Nashville.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11697/32726
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