Urban Atmospheric Chemistry with the EPISODE-CityChem Model


Photochemical ozone production in the urban area of Hamburg, Germany, was investigated using detailed emission inventories of ozone precursors and an urban-scale chemistry-transport model. Within the urban area, traffic-related emissions of nitric oxide destroy much of the inflowing ozone, mainly at night, leading to minimum concentrations along the traffic network and the port area. Net ozone production was determined based on the difference between the reference simulation, using an advanced photochemistry reaction scheme, and a simulation using photo-stationary state (PSS) assumption. Neglecting the photo-oxidation of VOC resulted in up to 4.5% lower average ozone in the city outflow in summer.
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