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Gaseous constituents in the plume from eruptions of Mount St. HelensMeasurements 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.
Document ID
19810038539
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Inn, E. C. Y.
(NASA Ames Research Center Moffett Field, CA, United States)
Vedder, J. F.
(NASA Ames Research Center Moffett Field, CA, United States)
Condon, E. P.
(NASA Ames Research Center Moffett Field, Calif., United States)
Ohara, D.
(LFE Corp. Richmond, Calif., United States)
Date Acquired
August 11, 2013
Publication Date
February 20, 1981
Publication Information
Publication: Science
Volume: 211
Subject Category
Geophysics
Accession Number
81A22943
Distribution Limits
Public
Copyright
Other

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