Characterization of aerosols from eruptions of Mount St. Helens
Measurements of mass concentration and size distribution of aerosols from eruptions of Mount St. Helens as well as morphological and elemental analyses were obtained between 7 April and 7 August 1980. In situ measurements were made in early phreatic and later, minor phreatomagmatic eruption clouds near the vent of the volcano and in plumes injected into the stratosphere from the major eruptions of 18 and 25 May. The phreatic aerosol was characterized by an essentially monomodal size distribution dominated by silicate particles larger than 10 micrometers in diameter. The phreatomagmatic eruption cloud was multimodal; the large size mode consisted of silicate particles and the small size modes were made up of mixtures of sulfuric acid and silicate particles. The stratospheric aerosol from the main eruption exhibited a characteristic narrow single mode with particles less than 1 micrometer in diameter and nearly all of the mass made up of sulfuric acid droplets.
- OSTI ID:
- 5480059
- Journal Information:
- Science (Washington, D.C.); (United States), Vol. 211
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MT ST HELENS
AIR POLLUTION
PARTICULATES
MONITORING
SILICATES
SULFURIC ACID
ACID RAIN
AEROSOLS
ERUPTION
PARTICLE SIZE
POLLUTION SOURCES
ATMOSPHERIC PRECIPITATIONS
CASCADE MOUNTAINS
COLLOIDS
DISPERSIONS
FEDERAL REGION X
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MOUNTAINS
NORTH AMERICA
OXYGEN COMPOUNDS
PARTICLES
POLLUTION
RAIN
SILICON COMPOUNDS
SIZE
SOLS
USA
WASHINGTON
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)