Satellite analysis and mesoscale behaviour of volcanic plumes and gas from Miyakejima, Japan
by Naoko Iino, Toshiaki Yano, Kisei Kinoshita, Megumi Koyamada, Shuichi Torii
International Journal of Environmental Technology and Management (IJETM), Vol. 4, No. 3, 2004

Abstract: 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.

Online publication date: Thu, 21-Oct-2004

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