Implications of AAOE observations for proposed chemical explanations of the seasonal and interannual behavior of Antarctic ozone. [Airborne Antarctic Ozone Experiment]

Journal Article · Thu Nov 30 04:00:00 EST 1989 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JD094iD14p16705· OSTI ID:7222545

Ko, M K.W.; Rodriguez, J M; Sze, N D ^[1]; Proffitt, M H ^[2]; Starr, W L ^[3]; Krueger, A ^[4]; Browell, E V; McCormick, M P ^[5]

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1. Atmospheric and Environmental Research, Inc., Cambridge, MA (United States)
2. NOAA Aeronomy Lab., Boulder, CO (United States)
3. NASA Ames Research Center, Moffett Field, CA (United States)
4. NASA Goddard Space Flight Center, Hampton, VA (United States)
5. NASA Langley Research Center, Hampton, VA (United States)

A number of numerical experiments using different assumptions on the initial odd nitrogen content and the efficiencies and durations of heterogeneous reactions is selected based on the simulations of the observed trace gas concentrations during the Airborne Antarctic Ozone Experiment (AAOE) in 1987. The model is used to calculate the seasonal behavior of O{sub 3} in 1987 and its possible interannual variations as the chlorine content of the atmosphere increases from 1 to 6 ppbv. The seasonal behavior in 1987 is compared with the total ozone mapping spectrometer (TOMS) and AAOE data. In all the cases considered, the catalytic cycle associated with the formation and photolysis of Cl{sub 2}O{sub 2} could account for more than half of the photochemical removal of O{sub 3} within the Antarctic vortex through mid-September. The reaction of BrO with ClO, which accounts for 15-20% of the removal in the same period, tends to play a more important role toward the end of September, when the concentration of ClO is expected to decrease. The detailed behavior of the calculated O{sub 3} depends on the assumptions for the spatial and temporal extent of denitrification, the initial concentrations of odd nitrogen species sequestered in the vortex in July, and the efficiencies and durations of the heterogeneous reactions in the months that follow. There is no simple relationship between the increase in chlorine level and the interannual decrease in Antarctic O{sub 3}.

• OSTI ID: 7222545
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 94:D14; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

29 ENERGY PLANNING, POLICY, AND ECONOMY
290301 -- Energy Planning & Policy-- Environment
Health
& Safety-- Regional & Global Environmental Aspects-- (1992-)
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ANTARCTIC REGIONS
ATMOSPHERIC CHEMISTRY
BROMINE COMPOUNDS
BROMINE OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
CHLORINE
CHLORINE COMPOUNDS
CHLORINE OXIDES
CORRELATIONS
DECOMPOSITION
DENITRIFICATION
ELEMENTS
HALOGEN COMPOUNDS
HALOGENS
LAYERS
LOSSES
MATHEMATICAL MODELS
MONITORING
NONMETALS
OXIDES
OXYGEN COMPOUNDS
OZONE
OZONE LAYER
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
POLAR REGIONS
SEASONAL VARIATIONS
VARIATIONS
VORTICES