GENERATION MECHANISM OF SO₂ HIGH-CONCENTRATION EVENTS IN THE CRATER FLOOR OF MT. ASO

Abstract

 By analyzing sulfur dioxide, SO₂ concentration data which was observed in the crater floor area of Mt. Aso and various existing meteorological data, relationship between the occurrence of high-concentration events exceeding the SO₂ environmental standard and meteorological conditions. And numerical simulation using the WRF was carried out to investigate mechanism to transport vertically from the Nakadake crater to the bottom of the crater floor. It was found that the high-concentration events occurred by vertical transportation of downslope wind of mountain waves or mountain wind.