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Inn EC, Vedder JF, Condon EP, et al. Gaseous constituents in the plume from eruptions of mount st. Helens. Science. 1981;211(4484):821-3doi: 10.1126/science.211.4484.821.
Inn, E. C., Vedder, J. F., Condon, E. P., & O'hara, D. (1981). Gaseous constituents in the plume from eruptions of mount st. Helens. Science (New York, N.Y.), 211(4484), 821-3. https://doi.org/10.1126/science.211.4484.821
Inn, E C, et al. "Gaseous constituents in the plume from eruptions of mount st. Helens." Science (New York, N.Y.) vol. 211,4484 (1981): 821-3. doi: https://doi.org/10.1126/science.211.4484.821
Inn EC, Vedder JF, Condon EP, O'hara D. Gaseous constituents in the plume from eruptions of mount st. Helens. Science. 1981 Feb 20;211(4484):821-3. doi: 10.1126/science.211.4484.821. PMID: 17740390.
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Science. 1981 Feb 20;211(4484):821-3. doi: 10.1126/science.211.4484.821.

Gaseous constituents in the plume from eruptions of mount st. Helens.

Science (New York, N.Y.)

E C Inn, J F Vedder, E P Condon, D O'hara

PMID: 17740390 DOI: 10.1126/science.211.4484.821

Abstract

Measurements in the stratosphere of gaseous constituents in the plume of Mount St. Helens were obtained during five flights of the NASA U-2 aircraft between 19 May and 17 June 1980. Mixing ratios from gas chromatographic measurements on samples acquired about 24 hours after the initial eruption show considerable enhancement over nonvolcanic concentrations for sulfur dioxide (more than 1000 times), methyl chloride (about 10 times), and carbon disulfide (more than 3 times). The mixing ratio of carbonyl sulfide was comparable to nonvolcanic mixing ratios although 3 days later it was enhanced two to three times. Ion chromatography measurements on water-soluble constituents are also reported. Very large concentrations of chloride, nitrate, and sulfate ions were measured, implying large mixing ratios for the water-soluble gaseous constituents from which the anions are derived. Measurements of radon-222 present in the plume are also reported.

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