Abstract. We report the results of two measurements of the concentrations and emission indices of gas-phase sulfur dioxide (EI(SO,-)) in the exhaust of an F100-200E turbofan engine. The broad goals of both experiments were to obtain exhaust sulfur speciation and aerosol properties as a function of fuel sulfur content. In the first campaign, an In all experiments the measured EI(SO2) was consistent with essentially all of the fuel sulfur appearing as gas-phase SO2 in the exhaust. However, accurate determination of S(IV) to S(VI) conversion was hampered by inconsistencies in the assays of total fuel sulfur content.
IntroductionSulfur in the fuels burned by jet aircraft is the source of several gas-phase and aerosol species emitted in engine exhaust plumes, including SO2, SO3, H2SO 4, sulfate aerosols, and activated soot particles. These species contribute to the impact of the civil and military air fleets on upper troposphere/ lower-stratosphere chemistry, aerosol loading, contrail and cloud formation, radiation balance, and ozone concentration
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