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Stratospheric ozone in the lower troposphere—II. Assessment of downward flux and ground-level impact
Abstract Aircraft measurements of four stratospheric O3-intrusion events (two during spring and two during fall) are used in conjunction with concurrent meteorological analyses to estimate the downward 03 flux in the upper and lower troposphere. The aircraft measurements used are among those reported earlier in Part I of this paper (Johnson and Viezee, 1981). The calculated upper tropospheric fluxes for the four cases show good agreement with earlier estimates by Danielsen and Mohnen (1977) of O3 fluxes associated with tropopause folding events. The estimated lower-tropospheric O3 fluxes for the two spring events and for one fall event suggest that more than half of the O3 mass injected into the upper troposphere by these stratospheric intrusions is probably mixed and diluted into the troposphere above 700 mb (3 km ASL). Large, direct impacts of stratospheric O3 intrusions at ground-level are thus unlikely. A review and analysis of the limited number of published observations of high O3 in stratospheric intrusions, and of anomalously high O3 at ground level attributed to stratospheric intrusions, also suggests that direct ground-level impacts may be infrequent (less than 1 per cent of the time), and most likely are associated with O3 concentrations (v/v) of 100 ppb or less. Additional observational studies are required to conclusively quantify the ground-level impact of stratospheric O3.
Stratospheric ozone in the lower troposphere—II. Assessment of downward flux and ground-level impact
Abstract Aircraft measurements of four stratospheric O3-intrusion events (two during spring and two during fall) are used in conjunction with concurrent meteorological analyses to estimate the downward 03 flux in the upper and lower troposphere. The aircraft measurements used are among those reported earlier in Part I of this paper (Johnson and Viezee, 1981). The calculated upper tropospheric fluxes for the four cases show good agreement with earlier estimates by Danielsen and Mohnen (1977) of O3 fluxes associated with tropopause folding events. The estimated lower-tropospheric O3 fluxes for the two spring events and for one fall event suggest that more than half of the O3 mass injected into the upper troposphere by these stratospheric intrusions is probably mixed and diluted into the troposphere above 700 mb (3 km ASL). Large, direct impacts of stratospheric O3 intrusions at ground-level are thus unlikely. A review and analysis of the limited number of published observations of high O3 in stratospheric intrusions, and of anomalously high O3 at ground level attributed to stratospheric intrusions, also suggests that direct ground-level impacts may be infrequent (less than 1 per cent of the time), and most likely are associated with O3 concentrations (v/v) of 100 ppb or less. Additional observational studies are required to conclusively quantify the ground-level impact of stratospheric O3.
Stratospheric ozone in the lower troposphere—II. Assessment of downward flux and ground-level impact
Viezee, William (author) / Johnson, Warren B (author) / Singh, Hanwant B (author)
Atmospheric Environment ; 17 ; 1979-1993
1983-01-01
15 pages
Article (Journal)
Electronic Resource
English
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