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The chlorine budget of the lower polar stratosphere: Upper limits on ClO, and Implications of new Cl2O2 photolysis cross sections

Publication ,  Journal Article
Shindell, DT; de Zafra, RL
Published in: Geophysical Research Letters
January 1, 1995

Chlorine catalytic chemistry, which destroys ozone while cycling chlorine between Cl, ClO, and Cl2O2, is the primary cause of the springtime Antarctic ozone hole. We have calculated the concentrations of Cl2O2 which are in equilibrium with midday ground‐based, aircraft, and satellite observations of ClO in the Antarctic spring lower stratosphere. Two significant conclusions are presented here: (1) Using the JPL 94 recommended rates and photolysis cross sections, more than ∼2.0 ppbv ClO in the polar lower stratosphere causes inferred total active chlorine to exceed the total chlorine budget. This limit is smaller than some reported ClO measurements. (2) Using smaller cross sections recently measured by Huder and DeMore [1995], the amount of Cl2O2 in midday equilibrium with measured ClO is approximately doubled. Activated chlorine inferred from many measurements then exceeds total chlorine in the lower stratosphere, suggesting these cross sections may be too small. © 1995 American Geophysical Union. All Rights Reserved

Duke Scholars

Published In

Geophysical Research Letters

DOI

EISSN

1944-8007

ISSN

0094-8276

Publication Date

January 1, 1995

Volume

22

Issue

23

Start / End Page

3215 / 3218

Related Subject Headings

  • Meteorology & Atmospheric Sciences
 

Citation

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Shindell, D. T., & de Zafra, R. L. (1995). The chlorine budget of the lower polar stratosphere: Upper limits on ClO, and Implications of new Cl2O2 photolysis cross sections. Geophysical Research Letters, 22(23), 3215–3218. https://doi.org/10.1029/95GL03262
Shindell, D. T., and R. L. de Zafra. “The chlorine budget of the lower polar stratosphere: Upper limits on ClO, and Implications of new Cl2O2 photolysis cross sections.” Geophysical Research Letters 22, no. 23 (January 1, 1995): 3215–18. https://doi.org/10.1029/95GL03262.
Shindell, D. T., and R. L. de Zafra. “The chlorine budget of the lower polar stratosphere: Upper limits on ClO, and Implications of new Cl2O2 photolysis cross sections.” Geophysical Research Letters, vol. 22, no. 23, Jan. 1995, pp. 3215–18. Scopus, doi:10.1029/95GL03262.
Shindell DT, de Zafra RL. The chlorine budget of the lower polar stratosphere: Upper limits on ClO, and Implications of new Cl2O2 photolysis cross sections. Geophysical Research Letters. 1995 Jan 1;22(23):3215–3218.
Journal cover image

Published In

Geophysical Research Letters

DOI

EISSN

1944-8007

ISSN

0094-8276

Publication Date

January 1, 1995

Volume

22

Issue

23

Start / End Page

3215 / 3218

Related Subject Headings

  • Meteorology & Atmospheric Sciences