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Precursor relationships, ozone formation and midday meteorology in Sydney
Abstract Precursor concentration distributions and the derived relationships which characterize the spatial distribution of emission sources in the Sydney airshed in 1975/6/7 are compared with precursor data obtained during the 1981/2 summer. The 1981/2 data shows that: (i) NMHC point sources no longer dominate the character of Sydney's moring time urban air parcels and (ii) morning time meteorology and/or overall 6:00–10:00 a.m. mass emission rates have changed, resulting in an increase in the frequency of occurrrence of moderate to high NHMC and NOx concentration events. The absence of dominant morning time NMHC point sources balances the increased precursor concentrations and gives rise to a predicted ozone concentration distribution for 1981/2 which is similar to that reported elsewhere for 1975/6/7. The marked reduction in the monitored frequency of occurrence of high ozone events since 1975/6/7 cannot be explained by changes in the characteristics of morningtime air parcels and it is suggested that the observed reduction may be due to a change in the midday (10:00 a.m.–4:00 p.m.) meteorology since 1975/6/7.
Precursor relationships, ozone formation and midday meteorology in Sydney
Abstract Precursor concentration distributions and the derived relationships which characterize the spatial distribution of emission sources in the Sydney airshed in 1975/6/7 are compared with precursor data obtained during the 1981/2 summer. The 1981/2 data shows that: (i) NMHC point sources no longer dominate the character of Sydney's moring time urban air parcels and (ii) morning time meteorology and/or overall 6:00–10:00 a.m. mass emission rates have changed, resulting in an increase in the frequency of occurrrence of moderate to high NHMC and NOx concentration events. The absence of dominant morning time NMHC point sources balances the increased precursor concentrations and gives rise to a predicted ozone concentration distribution for 1981/2 which is similar to that reported elsewhere for 1975/6/7. The marked reduction in the monitored frequency of occurrence of high ozone events since 1975/6/7 cannot be explained by changes in the characteristics of morningtime air parcels and it is suggested that the observed reduction may be due to a change in the midday (10:00 a.m.–4:00 p.m.) meteorology since 1975/6/7.
Precursor relationships, ozone formation and midday meteorology in Sydney
Post, K. (author) / Carruthers, N. (author)
Atmospheric Environment ; 17 ; 633-638
1982-06-22
6 pages
Article (Journal)
Electronic Resource
English
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