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Science 27 August 1993:
Vol. 261. no. 5125, pp. 1130 - 1134
DOI: 10.1126/science.261.5125.1130
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Articles
Chlorine Chemistry on Polar Stratospheric Cloud Particles in the Arctic Winter
C. R. Webster 1,
R. D. May 1,
D. W. Toohey 2,
L. M. Avallone 3,
J. G. Anderson 3,
P. Newman 4,
L. Lait 4,
M. R. Schoeberl 4,
J. W. Elkins 5, and
K. R. Chan 6
1 Jet Propulsion Laboratory, California Institute of Technology, MS 183-401, 4800 Oak Grove Drive, Pasadena, California 91109
2 Department of Geosciences, 216 Physical Science Research Facility, University of California, Irvine, CA 92717
3 Harvard University, Atmospheric Research Project, 40 Oxford Street, Cambridge, MA 02138
4 National Aeronautics and Space Administration (NASA), Goddard Space Flight Center, Code 916, Greenbelt, MD 20771
5 National Oceanographic and Atmospheric Agency, Climate Monitoring and Diagnostics Laboratory, 325 Broadway, Boulder, CO 80303-3328
6 NASA Ames Research Center, SGG/245-5, Moffett Field, CA 94035-1000
Simultaneous in situ measurements of hydrochloric acid (HCl) and chlorine monoxide (ClO) in the Arctic winter vortex showed large HCl losses, of up to 1 part per billion by volume (ppbv), which were correlated with high ClO levels of up to 1.4 ppbv. Air parcel trajectory analysis identified that this conversion of inorganic chlorine occurred at air temperatures of less than 196 ± 4 kelvin. High ClO was always accompanied by loss of HCI mixing ratios equal to  (ClO + 2Cl2O2). These data indicate that the heterogeneous reaction HCl + ClONO2  Cl2 + HNO3 on particles of polar stratospheric clouds establishes the chlorine partitioning, which, contrary to earlier notions, begins with an excess of ClONO2, not HCl.
Submitted on February 19, 1993
Accepted on July 13, 1993
THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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- Stratospheric Meteorological Conditions in the Arctic Polar Vortex, 1991 to 1992.
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- Chemical Loss of Ozone in the Arctic Polar Vortex in the Winter of 1991-1992.
- R. J. Salawitch, S. C. Wofsy, E. W. Gottlieb, L. R. Lait, P. A. Newman, M. R. Schoeberl, M. Loewenstein, J. R. Podolske, S. E. Strahan, M. H. Proffitt, et al. (1993)
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261, 1146-1149
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- Ozone Loss Inside the Northern Polar Vortex During the 1991-1992 Winter.
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