Measurements of ClO and O3 from 21 deg N to 61 deg N in the lower stratosphere during February 1988 - Implications for heterogeneous chemistry

Details Measurements of ClO and O3 from 21 deg N to 61 deg N in the lower stratosphere during February 1988 - Implications for heterogeneous chemistry Measurements of ClO and O3 from 21 deg N to 61 deg N in the lower stratosphere during February 1988 - Implications for heterogeneous chemistry

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.2273k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Dec. 1991, p. 2273-2276.

Physics

17

Atmospheric Chemistry, Chlorine Oxides, Ozone Depletion, Ozonometry, Stratosphere, Aerosols, Nitrogen Oxides, Photochemical Reactions, Sulfates, Temperate Regions, Winter

Scientific paper

The decline in stratospheric ozone at northern midlatitudes in wintertime may be caused by chlorine photochemistry that has been enhanced by heterogeneous reactions. The possibility that the heterogeneous reaction of N2O5 on sulfate aerosols is the cause of this decadal ozone decline is examined by comparing ClO and O3 measurements made in the lower stratosphere during February, 1988, with results from a 2D model. At midlatitudes, the abundances, latitudinal, and seasonal gradients of the observed ClO are similar to the results of a model with heterogeneous chemistry, but are in strong disagreement with the results from the model with only gas-phase chemistry. At low latitudes, agreement is best with the results of the model with only gas-phase chemistry. Limited observations indicate that the amount of reactive chlorine is being enhanced, and that heterogeneous chemistry is a likely cause.

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