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Science 27 August 1993:
Vol. 261. no. 5125, pp. 1136 - 1140
DOI: 10.1126/science.261.5125.1136
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Articles

Heterogeneous Reaction Probabilities, Solubilities, and the Physical State of Cold Volcanic Aerosols

O. Toon 1, E. Browell 2, B. Gary 3, L. Lait 4, J. Livingston 5, P. Newman 4, R. Pueschel 1, P. Russell 1, M. Schoeberl 4, G. Toon 3, W. Traub 6, F. P. J. Valero 1, H. Selkirk 1, and J. Jordan 7

1 NASA Ames Research Center, Moffett Field, CA 94035
2 NASA Langley Research Center, Hampton, VA 23665
3 Jet Propulsion Laboratory, Pasadena, CA 91109
4 Goddard Space Flight Center, Greenbelt, MD 20771
5 SRI International, Menlo Park, CA 94025
6 Smithsonian Astrophysical Observatory, Cambridge, MA 02138
7 Sterling Software Inc., Palo Alto, CA 94303

On 19 January 1992, heterogeneous loss of HNO3, ClNO3, and HCl was observed in part of the Mount Pinatubo volcanic cloud that had cooled as a result of forced ascent. Portions of the volcanic cloud froze near 191 kelvin. The reaction probability of ClNO3 and the solubility of HNO3 were close to laboratory measurements on liquid sulfuric acid. The magnitude of the observed loss of HCl suggests that it underwent a heterogeneous reaction. Such reactions could lead to substantial loss of HCl on background sulfuric acid particles and so be important for polar ozone loss.

Submitted on December 21, 1992
Accepted on July 13, 1993


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Physical Chemistry of the H2SO4/HNO3/H2O System: Implications for Polar Stratospheric Clouds.
M. J. Molina, R. Zhang, P. J. Wooldridge, J. R. McMahon, J. E. Kim, H. Y. Chang, and K. D. Beyer (1993)
Science 261, 1418-1423
   Abstract »    PDF »
Probing Stratospheric Ozone.
J. M. Rodriguez (1993)
Science 261, 1128-1129
   PDF »
The Seasonal Evolution of Reactive Chlorine in the Northern Hemisphere Stratosphere.
D. W. Toohey, L. M. Avallone, L. R. Lait, P. A. Newman, M. R. Schoeberl, D. W. Fahey, E. L. Woodbridge, and J. G. Anderson (1993)
Science 261, 1134-1136
   Abstract »    PDF »
Ozone and Aerosol Changes During the 1991-1992 Airborne Arctic Stratospheric Expedition.
E. V. Browell, C. F. Butler, M. A. Fenn, W. B. Grant, S. Ismail, M. R. Schoeberl, O. B. Toon, M. Loewenstein, and J. R. Podolske (1993)
Science 261, 1155-1158
   Abstract »    PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)