Author(s)

W. Behnke, M. Elend, U. Kriiger and C. Zetzsch

Abstract

Promotion and Inhibition of Br Catalysed Production of Halogenated Radicals from Gas-Phase Interaction with Sea-Salt Aerosols A contribution to subproject CMD W Behnke, M. Elend, U. Kriiger and C. Zetzsch Fraunhofer-Institut fur Toxikologie und Aerosolforschung, Nikolai-Fuchs-Strafte 1, D-30625 Hannover, Germany Introduction Former smog chamber experiments (Behnke et al, 1995; 1996), field experiments (Jobson et al, 1994; Singh et al, 1996) and model calculations (Mozurkewich, 1995; Vogt et #/., 1996) show that halogenated radicals are produced in the presence of sea-spray aerosol and ozone. Mozurkewich (1995) proposed that a chain reaction is initiated by the reaction between Cam's acid and Br which forms B% finally. Then BrO is produced from the reaction of ozone with Br atoms, BrO reacts with HO: in the gas-phase to form HOBr, which is adsorbed by the aerosol surface. In the droplets of the

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