Free radicals within the Antarctic vortex: The role of CFCs in Antarctic ozone loss
Journal Article
·
· Science (Washington, D.C.); (USA)
- Harvard Univ. Cambridge, MA (USA)
- Pennsylvania State Univ. (USA)
How strong is the case linking global release of chlorofluorocarbons to episodic disappearance of ozone from the Antarctic stratosphere each austral spring Three lines of evidence defining a link are (1) observed containment in the vortex of ClO concentrations two orders of magnitude greater than normal levels; (2) in situ observations obtained during ten high-altitude aircraft flights into the vortex as the ozone hole was forming that show a decrease in ozone concentrations as ClO concentrations increased; and (3) a comparison between observed ozone loss rates and those predicted with the use of absolute concentrations of ClO and BrO, the rate-limiting radicals in an array of proposed catalytic cycles. Recent advances in our understanding of the kinetics, photochemistry, and structural details of key intermediates in these catalytic cycles as well as an improved absolute calibration for ClO and BrO concentrations at the temperatures and pressures encountered in the lower antarctic stratosphere have been essential for defining the link. 6 figs., 35 refs.
- OSTI ID:
- 5548680
- Journal Information:
- Science (Washington, D.C.); (USA), Journal Name: Science (Washington, D.C.); (USA) Vol. 251:4989; ISSN SCIEA; ISSN 0036-8075
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010900 -- Coal
Lignite
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54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ANTARCTIC REGIONS
CHEMICAL REACTIONS
CHLORINATED ALIPHATIC HYDROCARBONS
DATA
EXPERIMENTAL DATA
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
INFORMATION
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OZONE
POLAR REGIONS
RADICALS
SEASONAL VARIATIONS
VARIATIONS
010900 -- Coal
Lignite
& Peat-- Environmental Aspects
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ANTARCTIC REGIONS
CHEMICAL REACTIONS
CHLORINATED ALIPHATIC HYDROCARBONS
DATA
EXPERIMENTAL DATA
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
INFORMATION
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OZONE
POLAR REGIONS
RADICALS
SEASONAL VARIATIONS
VARIATIONS