Non-Photochemical Oxidation of SO2 in Regionally Polluted Air During Winter

摘要

Median concentrations of SO2 and sulphate in air being transported from the United Kingdom and continental Europe to southern Scandinavia in the absence of precipitation indicate that even in wintertime there is an increase of sulphate with travel time. Comparisons of the observations with predictions by a simple transport model employing gas phase oxidation by OH and liquid phase oxidation by H2O2 indicate that an additional rate of oxidation of SO2 of about twenty times that of OH and H2O2, is needed to explain the observations. Liquid phase oxidation by ozone was examined as a possible process in wintertime.