Abstract
A two-dimensional model of the photochemistry of the urban troposphere has been applied to the case of normal convective air flow upwind, within and downwind of an urban area representing northern New Jersey. The atmospheric scavenging molecules O 3, HO, and HO 2 are computed to be least abundant at low altitudes near the regions of highest source density. Their concentrations increase downwind and at higher altitudes, leading to maximum production of inorganic acids and other photochemical products in those locations. Cycle analyses for the elements carbon (less CO 2), nitrogen and sulfur are derived from the calculations and indicate that, for the conditions specified in this work, 74% of the carbon, 12% of the nitrogen, and 10 % of the sulfur emitted anthropogenically are not consumed within ~ 100 km of the point of emission but are injected into the free troposphere.
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