On the observations of Mount St Helens volcanic emissions: Research note |
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| Authors: | YS Chung A Gallant F Fanaki M Millán |
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| Institution: | 1. Atmospheric Environment Service , Downsview, Ontario;2. Barringer Research Ltd , Rexdale, Ontario |
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| Abstract: | Abstract The envelopes of dust clouds from the May 18, 1980 eruption of Mount St Helens in Washington State, U.S.A. were plotted as they traversed the northern United States and southern Canada. Visibility observations at many meteorological stations indicated the presence of volcanic ash and smoke and verified trajectory calculations. In addition, sulphur dioxide released by the volcano was detected as it passed over Toronto, Ontario, while satellite photographs showed dust clouds in the upper atmosphere. |
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