Ozone Measurements at Several Rural and Urban Sites in New York State

Coffey, Peter E.; Whitby, Robert; Stasiuk, William N.; Husain, Liaquat; Mohnen, Volker A.

doi:10.1520/stp36605s

Cited by 5 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such transport has been proposed to explain occurrence of elevated oxidant/03 concentrations over large rural areas. According to other investigators, such as Coffey 11 and Dobbins et al, 12 the principal specific mechanism explaining such occurrence entails direct transport of oxidant/Os from oxidant/03-rich layers aloft to the surface. Vukovich is not in complete agreement with this mechanism and explanation.…”

Section: The Issue Of Oxidant Transportmentioning

confidence: 96%

International Conference On Oxidant Problems: Analysis of the Evidence/Viewpoints Presented

Dimitriades¹,

Altshuiler²

1978

Journal of the Air Pollution Control Association

View full text Add to dashboard Cite

Calvert's principal points 3 are that (a) presently the smog chamber and computer modeling approaches to evaluating oxidant forming potential of organic air pollutants suffer from certain as yet unsolved problems, and (b) in addition to these two approaches, a third, direct atmospheric studies of chemical changes in ambient atmosphere, should be pursued in parallel. The computer modeling method is presently of uncertain validity mainly because all critical rate constants and the precise composition of air pollutant mixtures in urban and rural air masses are not well known. The smog chamber method is of questionable applicability to the real atmosphere,

show abstract

Section: The Issue Of Oxidant Transportmentioning

confidence: 96%

International Conference On Oxidant Problems: Analysis of the Evidence/Viewpoints Presented

Dimitriades¹,

Altshuiler²

1978

Journal of the Air Pollution Control Association

View full text Add to dashboard Cite

show abstract

“…Nevertheless, in order to give some idea of the spatial distribution of episodes, the following representations have been adopted: Sudbury for the northern areas, Ottawa and Cornwall for the eastern districts, and Orono, Stouffville and Scarborough for the central-southern regions. Since scavenging of ozone in urban centres, due to higher levels of nitric oxide in cities than in rural areas, has been noted in other studies [5], more attention has been focussed on six rural stations: Huron Park, Petrolia, Merlin, Simcoe, Orono and Stouffville. Surface and upper air synoptic weather maps as well as computed air trajectories were assembled and analyzed with a view to relating ozone episodes to meteorological conditions.…”

Section: Data Availabilitymentioning

confidence: 96%

Some features of the ozone climatology of Ontario, Canada and possible contributions of stratospheric ozone to surface concentrations

Mukammal

Neuman

Nichols

1985

Arch. Met. Geoph. Biocl. A.

View full text Add to dashboard Cite

SummaryBackground ozone concentration displayed distinct seasonal variations at all stations, with a maximum of about 40 ppb in spring and a minimum of about 23 ppb in autumn. The monthly and yearly mean diurnal variations of ozone at urban stations exhibited bi-modal characteristics not evident at rural sites. Two daily maxima and minima were recorded at urban stations, but only one maximum and one minimum at rural sites. The second minimum in the evening at urban stations was shown to be related to high levels of nitric oxide, while nighttime heat island was considered the main cause of the second maximum. One-day resultant trajectories show that the most frequent and highest ozone concentrations were associated with a relatively light to moderate south to southwesterly flow but not with light or with strong winds. Although there were several recognizable meteorological regimes associated with elevated ozone concentrations over Ontario, those with weak pressure gradients favourable for the onset of lake breeze or with southwesterly flows on the west side of slow-moving high pressure centres crossing the eastern United States were the most frequent and resulted in the highest ozone concentrations. Ozone maxima over Ontario may mostly be attributed to long distance transport of emissions from major industrial areas south of the border. However, tropospheric and stratospheric contributions cannot be ruled out and may even be a major source at times. A case study of possible stratospheric ozone influx into the troposphere is presented. Zusammenfassung Grundlagen der Ozonklimatologie der

show abstract

“…In the group of days with the characteristic of reported morning mixing height less than 400 m there was only one day where the offerin/acetylene ratio increased during the 0730-1000 period; the largest decrease ever observed was from 3.46 to 1.18. Several authors have reported significant ozone concentrations aloft (600-2500 m), especially above nocturnal temperature inversions [Siple et al, 1976;Wolff et al, 1977;Wolff and Wright, 1977;Coffey et al, 1978]. As the inversion dissipates, vertical mixing can transport any ozone aloft to the surface.…”

Section: H-' This Leads To An Oh Concentration Of 123 X 10 -S Ppm (mentioning

confidence: 99%

Specific nonmethane hydrocarbons and their relationship to ozone in an eastern urban area, Manhattan

Altwicker¹,

Whitby²,

Lioy³

1980

J. Geophys. Res.

View full text Add to dashboard Cite

Specific hydrocarbons emitted from mobile and stationary sources enter into the formation of secondary pollutants, such as ozone and aerosols. The extent to which specific hydrocarbons perform this role is due to their differences in reactivities. Detailed knowledge of the hydrocarbon composition of the atmosphere as a function of time and altitude therefore is desirable. Measurements were carried out at ground level and simultaneously at elevated sites which were frequently above the inversion. Together with continuous information on ozone, two to four ambient air samples were collected per site per day for individual species hydrocarbon analysis by gas chromatography. The resultant data base is examined here in terms of the four major hydrocarbon classes (paraffins, olefins, aromatics, and acetylene) with respect to absolute concentrations, characteristic ratios, decay rates, and ozone/hydrocarbon relationships. With occasional notable exceptions all hydrocarbon species were present in lower concentrations at the elevated sites (40–50%) characteristic ratios to acetylene reflected changes in automobile exhaust composition and stationary source contributions. Decreases in hydrocarbon/acetylene ratios were used to estimate ambient hydroxyl radical concentrations. The percent contributions of olefins was lower in 1975/1978 than in 1969. Although hydrocarbon concentrations appear to have declined between 1975 and 1978, ozone concentrations during the study periods were higher in 1978.

show abstract

Ozone Measurements at Several Rural and Urban Sites in New York State

Cited by 5 publications

References 4 publications

International Conference On Oxidant Problems: Analysis of the Evidence/Viewpoints Presented

International Conference On Oxidant Problems: Analysis of the Evidence/Viewpoints Presented

Some features of the ozone climatology of Ontario, Canada and possible contributions of stratospheric ozone to surface concentrations

Specific nonmethane hydrocarbons and their relationship to ozone in an eastern urban area, Manhattan

Contact Info

Product

Resources

About