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Abstract. An analysis of multiwavelength stratospheric aerosol extinctioncoefficient data from the Stratospheric Aerosol and Gas Experiment II andIII/ISS instruments is used to demonstrate a coherent relationship betweenthe perturbation in extinction coefficient in an eruption's main aerosollayer and the wavelength dependence of that perturbation. This relationshipspans multiple orders of magnitude in the aerosol extinction coefficient ofstratospheric impact of volcanic events. The relationship ismeasurement-based and does not rely on assumptions about the aerosol sizedistribution. We note limitations on this analysis including that thepresence of significant amounts of ash in the main sulfuric acid aerosollayer and other factors may significantly modulate these results. Despitethese limitations, the findings suggest an avenue for improving aerosolextinction coefficient measurements from single-channel observations such asthe Optical Spectrograph and Infrared Imager System as they rely on a priorassumptions about particle size. They may also represent a distinct avenuefor the comparison of observations with interactive aerosol models used inglobal climate models and Earth system models.

atmospheric chemistry and physics

Evidence for the predictability of changes in the stratospheric aerosol size following volcanic eruptions of diverse magnitudes using space-based instruments