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Science 20 February 1981:
Vol. 211. no. 4484, pp. 816 - 818
DOI: 10.1126/science.211.4484.816
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Articles

Airborne Studies of the Emissions from the Volcanic Eruptions of Mount St. Helens

PETER V. HOBBS 1, LAWRENCE F. RADKE 1, MARK W. ELTGROTH 1, and DEAN A. HEGG 1

1 Department of Atmospheric Sciences, University of Washington, Seattle 98195

The concentrations of particles less than 10 micrometers in diameter in the ash emissions from Mount St. Helens have been more than 1000 times greater than those in the ambient air. Mass loadings of particles less than 2 micrometers in diameter were generally several hundred micrograms per cubic meter. In the ash clouds, produced by the large eruption on 18 May 1980, the concentrations of several trace gases generally were low. In other emissions, significant, but variable, concentrations of sulfur gases were measured. The 18 May eruption produced nuées ardentes, lightning flashes, and volcanic hail.

Submitted on September 18, 1980
Revised on December 8, 1980


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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