Impact of Global NOx Sources on the Northern Latitudes
Nitrogen oxides (NOx), through their control of tropospheric ozone production, play a major role in determining the global reactivity of the atmosphere. The concentration of these oxides varies by as much as a factor of 1000 between continental source regions and remote locations and fluctuates significantly with season at high latitudes. While NOx levels appear to be rather low (<50 pptv) away from local sources, high levels of PAN, an important reservoir for NOx, have been measured at the surface in the winter polar regions [Barrie and Bottenheim, 1991] and in the free troposphere north of 30°N [Singh, Salas and Viezee, 1986]. Furthermore, our recent global chemical transport model (GCTM) study finds PAN to be the major reactive nitrogen species in the northern latitudes [Kasibhatla et al., 1992].
KeywordsNorthern Latitude Fossil Fuel Combustion Vertical Wind Shear Free Troposphere Total Column Ozone
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