| In this thesis, I examine the tropospheric chemistry of ozone, nitrogen oxides, and non-methane hydrocarbons using one-dimensional and three-dimensional photochemical models. I develop a chemical mechanism, which I use in these models to study the chemistry occurring within the continental boundary layer, and to assess the impact of boundary layer processes on the global tropospheric distributions of trace gases.;Observations made during the Shenandoah Cloud and Photochemistry Experiment (SCAPE) during September 1990 suggest a seasonal transition from NO;Concentrations of the carbonyl compounds formaldehyde, glyoxal, and methylglyoxal, which were measured during SCAPE, are well-simulated using the photochemical model. Concentrations of these carbonyls and the concentration ratios are shown to be consistent with isoprene oxidation providing the major source of these compounds. Oxidation of CH;The ozone production efficiency per unit NO;I study the export of NO;I then investigate the impact of fossil fuel combustion on the global distributions of NO... |
