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Science 8 September 1989:
Vol. 245. no. 4922, pp. 1095 - 1098
DOI: 10.1126/science.245.4922.1095
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Articles

Science, Vol 245, Issue 4922, 1095-1098
Copyright © 1989 by American Association for the Advancement of Science

articles

Rate of formation of the ClO dimer in the polar stratosphere: implications for ozone loss

SP Sander, RR Friedl, and YL Yung

Jet Propulsion Laboratory, California Institute of Technology, Pasadena 91109, USA.

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 (O3) 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 O3 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 O3 depletion in the early spring (28 August to 17 September), indicating that there may be additional catalytic cycles, besides those currently recognized, that destroy O3.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
The Photoreactivity of Chlorine Dioxide.
V. Vaida and J. D. Simon (1995)
Science 268, 1443-1448
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Chlorine Chemistry on Polar Stratospheric Cloud Particles in the Arctic Winter.
C. R. Webster, R. D. May, D. W. Toohey, L. M. Avallone, J. G. Anderson, P. Newman, L. Lait, M. R. Schoeberl, J. W. Elkins, and K. R. Chan (1993)
Science 261, 1130-1134
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Free Radicals Within the Antarctic Vortex: The Role of CFCs in Antarctic Ozone Loss.
J. G. ANDERSON, D. W. TOOHEY, and W. H. BRUNE (1991)
Science 251, 39-46
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The Dynamics of the Stratospheric Polar Vortex and Its Relation to Springtime Ozone Depletions.
M. R. SCHOEBERL and D. L. HARTMANN (1991)
Science 251, 46-52
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Spatial variation of ozone depletion rates in the springtime Antarctic polar vortex.
Y. Yung, M Allen, D Crisp, R. Zurek, and S. Sander (1990)
Science 248, 721-724
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