Behnke, W.W.BehnkeElend, M.M.ElendKrüger, H.-U.H.-U.KrügerZetzsch, C.C.Zetzsch2022-03-092022-03-092002https://publica.fraunhofer.de/handle/publica/340842Recent laboratory studies, model calculations and field experiments show that chloride is activated to atomic Cl under special environmental conditions. It is established, that in the presence of sea-spray aerosol at low levelled NOx-concentration a chain reaction can be initiated (by H2SO5 or OH oxidising Br-) leading to Br2 in the gas-phase. There, HOBr is formed in the presence of ozone and hydrocarbons and, after its uptake by sea-spray aerosol, Br2 or BrCl released again. The uptake rate of HOBr is one of the key reactions in the reaction scheme. This was investigated in smog-chamber experiments and by model calculations.ensmog chamber615610620conference paper