Photochemical bromine production implicated in Arctic boundary-layer ozone depletion

Details Photochemical bromine production implicated in Arctic boundary-layer ozone depletion Photochemical bromine production implicated in Arctic boundary-layer ozone depletion

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.355..150m&link_type=abstract

Nature (ISSN 0028-0836), vol. 355, Jan. 9, 1992, p. 150-152. Research supported by NSERC and Atmospheric Environment Service.

Computer Science

114

Arctic Regions, Atmospheric Chemistry, Ozone Depletion, Photochemical Reactions, Planetary Boundary Layer, Bromine Compounds, Organic Compounds, Sea Water

Scientific paper

Ozone destruction in the Arctic boundary layer beings at polar sunrise, continues for the months of March and April, and is strongly associated with levels of filterable bromine which are much greater than during the rest of the year. It is suggested here that sea-salt Br(-) reaches high concentrations in the snow pack during the long polar night and is evolved into the atmosphere as Br2 at polar sunrise. Ordinarily, gas-phase photochemistry would convert Br2 to HBr or brominated organic compounds with consequently little destruction of boundary-layer ozone. It is proposed that the HBr and brominated organic compounds will be scavenged by the ambient aerosols and ice crystals, and that these heterogeneous reactions release B2 back to the atmosphere. It is argued that this cycling of bromine between the aerosol and the gas phase should maintain sufficiently high levels of Br atoms and BrO radicals to destroy ozone.

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