Gaseous constituents in the plume from eruptions of Mount St. Helens
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.
- OSTI ID:
- 5480033
- Journal Information:
- Science (Washington, D.C.); (United States), Journal Name: Science (Washington, D.C.); (United States) Vol. 211; ISSN SCIEA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALPHA DECAY RADIOISOTOPES
CASCADE MOUNTAINS
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
CHROMATOGRAPHY
DAYS LIVING RADIOISOTOPES
DISULFIDES
EVEN-EVEN NUCLEI
FEDERAL REGION X
GAS CHROMATOGRAPHY
GASEOUS WASTES
HALIDES
HALOGEN COMPOUNDS
HEAVY NUCLEI
ISOTOPES
MOUNTAINS
MT ST HELENS
NORTH AMERICA
NUCLEI
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLUMES
RADIOISOTOPES
RADON 222
RADON ISOTOPES
SEPARATION PROCESSES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
USA
WASHINGTON
WASTES