The reduced sulfur compounds H2S and CH3SCH3 have included in a diurnal kinetic photochemical model of the natural marine atmosphere. The self-consistent solution provides the oceanic emission fluxes necessary to balance atmospheric chemical removal. These fluxes imply global values of 30 Tg S yr-1, near the lower limit prescribed by current global sulfur cycle assessments. The conversion of reduced sulfur gases to SO2 does not result in SO2 concentrations as high as are measured; either a natural or transport source of SO2 in present or additional reduced sulfur compounds are involved in oceanic SO2 production. The calculated upper limit for sulfate formation as a result of oxidation chemistry from the H2S and CH3SCH3 precursors is of order 25 Tg S yr-1, with an additional 29 Tg S yr-1 resulting from oxidation of SO2 generated from sources other than H2S and CH3SCH3.