Condensation and Coagulation of Aerosol Particles in the Decay Phase of the Stratospheric Aerosol Layer After the Volcanic Eruption

Abstract

The role of particle-growing processes such as coagulation and condensation in the decay phase of the stratospheric aerosol layer enhanced by the volcanic eruption was discussed by using a one-dimensional and time-dependent numerical model which includes eddy diffusion, coagulation, condensation and sedimentation. Result of calculation suggests that the characteristic time of the decay of the stratospheric aerosol layer is about 1.5-3.0 years for the volcanic eruption which injects a large amount of SO₂gas into the stratosphere.