Relationships between direction of wind flow and ozone inflow concentrations at rural locations outside of St. Louis, MO

• Published in: Atmospheric Environment (1967) 1986-01, Vol.20 (11), p.2175-2184
• Main Author: Altshuller, A.P.
• Format: Article
• Language: English
• Subjects: anthropogenic emissions; Applied sciences; Atmospheric pollution; biogenic emissions; Exact sciences and technology; free trophosphere; nitrogen oxide; Ozone; photochemical; planetary boundary layer; Pollutants physicochemistry study: properties, effects, reactions, transport and distribution; Pollution; stratosphere; wind direction
• ISSN: 0004-6981; 1352-2310
• DOI: 10.1016/0004-6981(86)90309-4

The relationships between the monthly and seasonal averages of the daily 1200–1500 h O 3 inflow concentrations and wind flow direction have been evaluated. The O 3 measurements used are those during inflow of air parcels from upwind to rural monitoring stations outside of St. Louis, MO. The results obtained are consistent with the O 3 measurements reported from other monitoring studies at rural locations both to the west and east of St. Louis. Although there is a stratospheric component to these ground level rural O 3 concentrations, it is likely that most of the O 3 measured during the warmer months of the year is associated with photochemical O 3 formation in the planetary boundary layer and in the free troposphere. A substantial part of the increments in rural O 3 concentrations which occur from west to east of St. Louis during the warmer months of the year appear best to be accounted for as a result of photochemical formation O 3 precursors from anthropogenic emission sources to the east of St. Louis. Differences in the values of meteorological parameters with wind flow direction account for only a small part of the differences in O 3 concentration observed.