Author(s)

H. Ueda, M. Kajino & H. Satsumabayashi

Abstract

Miyake volcano began to erupt on 8 July 2000. Its SO2 emission amounted to a maximum 6×104 ton per day, which is equivalent to the total anthropogenic emission in northeast Asia and is 20 times larger than that of Japan. It has then decreased gradually but remains at a level of 104 ton per day even now. Here airborne volatile-component partitioning among gas, aerosols and raindrops caused by the volcanic effluents and evidence of its change were investigated by continuous observation of aerosols, together with gas and precipitation measurements, on a prominent mountain ridge and from analysis based on a multicomponent thermodynamic equilibrium model. The volcanic SO2 is converted to sulphate aerosols in the atm

Keywords