Model study of tropospheric composition response to NOx and CO pollution

The effect of NOx and CO pollution on other important atmospheric gases from 0–16 km in the northern temperate zonal belt is calculated using a 2-D (altitude–longitude) channel photochemical model with climatic zonal and vertical fixed transport. The geographical inhomogeneities of the NOx and CO large-scale surface releases are modeled. The distinction between NOx and CO fluxes from the oceanic and land surfaces and those from areas with various pollution source intensities is considered. NOx and CO emissions from world transport aviation engine exhausts and the NO source from lightning discharges are also included. Model results are analyzed and compared with observational data for nitrogen compounds, carbon monoxide, and ozone. The dependence of the spatial and temporal hydroxyl distribution on the carbon monoxide (as the main destroyer of OH) concentration field is analyzed and discussed.