Heterogeneous reactions with NaCl in the El Chichon volcanic aerosols

Details Heterogeneous reactions with NaCl in the El Chichon volcanic aerosols Heterogeneous reactions with NaCl in the El Chichon volcanic aerosols

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..673m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, April 1991, p. 673-676.

Physics

9

Aerosols, Atmospheric Chemistry, Atmospheric Composition, Sodium Chlorides, Volcanoes, Chemical Reactions, Hydrochloric Acid, Nitric Oxide, Nitrogen Oxides, Ozone

Scientific paper

Previous investigations of the effects of the 1982 eruption of the El Chichon volcano could not explain all the observations of changes in O3, HCl, NO and NO2 simultaneously without proposing unproven chemical reactions. Since reactions between solid NaCl and gaseous ClNO3 and N2O5 rapidly produce photochemically active chlorine species and solid NaNO3 in laboratory experiments, it is suggested that these reactions could have occurred with the NaCl observed to be present in the El Chichon sulfuric acid areosols. As a consequence, it is predicted that HCl should increase substantially, while NO(x) should decrease, in agreement with the measurements after the eruption. Ozone should be only slightly affected by these reactions. Reactions between solid NaCl and the acids H2SO4 and HNO3 might prove to be important, but sufficient evidence regarding their efficiency and the pressure of HNO3 in the aerosols is lacking.

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