Heterogeneous chemistry on liquid sulfate aerosols - A comparison of in situ measurements with zero-dimensional model calculations

Details Heterogeneous chemistry on liquid sulfate aerosols - A comparison of in situ measurements with zero-dimensional model calculations Heterogeneous chemistry on liquid sulfate aerosols - A comparison of in situ measurements with zero-dimensional model calculations

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1283m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Aug. 1990, p. 1283-1286. Research supported by the Chemical Manufacturer

Physics

15

Aerosols, Atmospheric Chemistry, Chlorine, Stratosphere, Sulfates, Chlorine Oxides, Hydrogen Chlorides, Nitric Acid, Photochemical Reactions

Scientific paper

The possibility that stratospheric chlorine is converted from reservoir to reactive forms by heterogeneous reactions on background sulfate aerosols is examined. Tightly constrained photochemical models have been used to calculate ClO abundances for the morning and the afternoon conditions observed on January 24, 1989 outside the Arctic polar vortex by instruments on the NASA ER-2 aircraft. Calculations involving gas-phase chemistry only and calculations with heterogeneous chemistry including HCl evaporation from the aerosol both produce ClO abundances that agree with observations; calculations in which HCl removal from the aerosol is controlled by heterogeneous reactions produce ClO abundances that are 3 to 3.5 times larger than observations. These results suggest that HCl evaporation must be included in a model of the chemistry of background aerosols.

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