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Recent in‐situ emission measurements of the Concorde in the lower stratosphere point to a surprisingly efficient conversion of fuel sulfur to H 2 SO 4 in the exhaust plume. By means of a comprehensive model, the formation and evolution of aerosol particles and precursors are calculated in the diluting aircraft wake. The results provide strong evidence that high levels of SO 3 present in the nascent plume are required to explain the observations of large numbers of nanometer‐sized aerosols. Limiting particle formation at emission to keep potential chemical effects on stratospheric ozone small will require control of the sulfur oxidation kinetics during fuel combustion. The similarities between super‐ and subsonic exhaust plumes suggest that the presence of SO 3 in the latter will also be a key limiting factor in new aerosol production.
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Kärcher et al. (1997) studied this question.
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