METEOROLOGICAL CONDITIONS WHEN CONCENTRATION OF SO₂ ERUPTED FROM MT. ASO IS HIGH IN SURROUNDING AREAS

Abstract

 In order to develop a simple risk evaluation method for SO₂ erupted from Mt. Aso in Kyushu district, west Japan, relationships between SO₂ concentration variations observed at a point 20km east from the crater of the mount and some meteorological observation data were examined. By using cluster analysis, days when observed SO₂ concentration were relatively high, were selected from the target period and the meteorological data of the days were analyzed. Some typical meteorological patterns which can cause high SO₂ concentrations were clarified.