The vertical distribution of ozone recorded over northern Namibia during SAFARI-92 is examined as a function of prevailing atmospheric circulation. Two dominant synoptic weather types, namely anticyclonic flow and flow associated with a westerly trough, are identified and composite ozone profiles produced for each weather type. In both cases an elevated, enriched ozone layer (9--12 km), where ozone concentrations exceed 80 ppbv on average, and 100--120 ppbv on individual days, is present. Under anticyclonic conditions, ozone increases steadily from surface values of around 40 ppbv to about 60--80 ppbv throughout the troposphere. In contrast, the westerly trough is characterized by a midtropospheric (4--8 km) ozone minimum, where values are 20 ppbv lower. This gives rise to a double ozone maximum in the troposphere. The elevated, enriched layer is thought to be a pervasive layer equatorward of 20 ¿S and to result from biomass burning. ¿ American Geophysical Union 1996