Abstract
This paper deals with the origin of sulphates (SO = 4 ) in the stratosphere during periods of volcanic quiescence. Based on measurements taken during the 1971-1981 Airstream Project, we determined that the oxidation of carbonyl sulphide molecules (COS) is sufficient to explain the distribution of SO = 4 in the stratosphere. Oxidation by OH attack appears negligible, photodissociation is significant. The stratospheric life time of COS molecules is estimated at approximately 4 years. The mean oxidation rate of COS in the stratosphere is 1.0 x 10 7 molecules cm -2 s -1 . DOI: 10.1111/j.1600-0889.1986.tb00090.x
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