Inderscience Publishers

Satellite analysis and mesoscale behaviour of volcanic plumes and gas from Miyakejima, Japan

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Miyakejima plumes of ash-rich and vapour-rich clouds were detected well by the NOAA/AVHRR data, and the height of eruption cloud on 29 August 2000 was estimated reasonably using the brightness temperature at 11 µm of NOAA/AVHRR and the upper air data taking into account the effect of ash emissivity. We found two different mechanisms which bring the high concentration SO2 to the mainland of Japan: convective daytime mixing brings gas down to the surface, after advection from Miyakejima in the upper air by winds associated with high pressure system; and the volcanic gas descends to the island surface in strong winds associated with stationary fronts and low pressure systems.

Keywords: eruption clouds, NOAA/AVHRR, sulphur dioxide, volcanic ash, Japan, satellite analysis, mesoscale behaviour, volcanic plumes, volcanic gas, Miyakejima volcano

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