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Heterogeneous reactions with NaCl in the El Chichon volcanic aerosols

Michelangeli, Diane V. and Allen, Mark and Yung, Yuk L. (1991) Heterogeneous reactions with NaCl in the El Chichon volcanic aerosols. Geophysical Research Letters, 18 (4). pp. 673-676. ISSN 0094-8276. doi:10.1029/91GL00547.

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Previous investigations of the effects of the 1982 eruption of the El Chichon volcano could not explain all the observations of changes in O_3, HCl, NO and NO_2 simultaneously without proposing unproven chemical reactions. Since reactions between solid NaCl and gaseous ClNO_3 and N_2O_5 rapidly produce photochemically active chlorine species and solid NaNO_3 in laboratory experiments, we suggest that these reactions could have occurred with the NaCl observed to be present in the El Chichon sulfuric acid aerosols. As a consequence, we predict that HCl should increase substantially, while NO_x should decrease, in agreement with the measurements after the eruption. Ozone should only be slightly affected by these reactions. Reactions between solid NaCl and the acids H_2SO_4 and HNO_3 might prove to be important, but we lack sufficient evidence regarding their efficiency and the presence of HNO_3 in the aerosols to be more conclusive.

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Yung, Yuk L.0000-0002-4263-2562
Additional Information:© 1991 by the American Geophysical Union. Received: August 24, 1990; revised: November 28, 1990; accepted: February 12, 1991. Paper number 91GL00547. We thank M.-T. Leu for valuable discussions and B. Finlayson-Pitts for communication of laboratory results prior to publication. We also are grateful to the anonymous reviewers for pointing out the deficiencies of our initial presentation. This work was supported by NAGW-413 to California Institute of Technology. One of us (DVM) acknowledges support of a NASA NRC Fellowship. Contribution number 4898 from the Division of Geological and Planetary Sciences, California. Institute of Technology, Pasadena, California 91125.
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Caltech Division of Geological and Planetary Sciences4898
Issue or Number:4
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Official Citation:Heterogeneous reactions with NaCl in the El Chichon volcanic aerosols (pages 673–676) Diane V. Michelangeli, Mark Allen and Yuk. L. Yung DOI: 10.1029/91GL00547
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48425
Deposited By: Ruth Sustaita
Deposited On:13 Aug 2014 16:14
Last Modified:10 Nov 2021 18:31

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