Rate of Formation of the ClO Dimer in the Polar Stratosphere: Implications for Ozone Loss

The gas-phase recombination of chlorine monoxide (ClO) has been investigated under the conditions of pressure and temperature that prevail in the Antarctic stratosphere during the period of maximum ozone (O$_{3}$) disappearance. Measured rate constants are less than one-half as great as the previous...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1989-09, Vol.245 (4922), p.1095-1098
Main Authors: Sander, Stanley P., Friedl, Randall R., Yung, Yuk L.
Format: Article
Language:English
Subjects:
540120 - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-)
Analysis
ANTARCTIC REGIONS
ANTARCTICA
Atmosphere
ATMOSPHERIC CHEMISTRY
Atmospheric composition. Chemical and photochemical reactions
Balloons
CHALCOGENIDES
CHEMISTRY
Chlorine
Chlorine - chemistry
CHLORINE COMPOUNDS
CHLORINE OXIDES
DATA
Dimers
EARTH ATMOSPHERE
Earth, ocean, space
ENVIRONMENTAL SCIENCES
Exact sciences and technology
EXPERIMENTAL DATA
External geophysics
Geophysics
HALOGEN COMPOUNDS
INFORMATION
Kinetics
LOSSES
Mathematical constants
MATHEMATICAL MODELS
Measurement
Modeling
Models, Chemical
Molecules
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
OZONE
Ozone - chemistry
Ozone layer depletion
Photochemistry
Physics of the high neutral atmosphere
POLAR REGIONS
STRATOSPHERE
Temperature
Temperature dependence
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Description
Summary:The gas-phase recombination of chlorine monoxide (ClO) has been investigated under the conditions of pressure and temperature that prevail in the Antarctic stratosphere during the period of maximum ozone (O$_{3}$) disappearance. Measured rate constants are less than one-half as great as the previously accepted values. One-dimensional model calculations based on the new rate data indicate that currently accepted chemical mechanisms can quantitatively account for the observed O$_{3}$ losses in late spring (17 September to 7 October). A qualitative assessment indicates that the existing mechanisms can only account for at most one-half of the measured O$_{3}$ depletion in the early spring (28 August to 17 September), indicating that there may be additional catalytic cycles, besides those currently recognized, that destroy O$_{3}$.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.245.4922.1095