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Physical and chemical characteristics of Mount St. Helens airborne debrisTephra and aerosols from the May 18, 1980 eruption of Mount St. Helens, Washington were sampled in the lower stratosphere with a WB-57F aircraft. The main body of the plume was intercepted over western Kansas on May 20, 48 hours after the eruption, at an altitude of 15.2 km. Concentrations on filter samples were 26 ng of SO4(-2) of air and 579 ng of ash/g of air. Angular glass pyroclasts ranged in size from 0.5 to 10 microns, with a mean grain of 2 microns. Samples collected at altitudes of 16.7 and 12.5 km had only traces of SO4(-2) and ash. A second flight was flown, 72 hours after the eruption, on May 21. From north Texas to central Wyoming, at an altitude of 15.2 km less than 0.5 to 38 ng of ash/g of air and 1.0 to 2.2 ng of SO4(-2)/g of air were sampled. At an altitude of 18.3 km, from central Wyoming to NW New Mexico, the plume density and character were variable.
Document ID
19830003272
Document Type
Conference Paper
Authors
Sedlacek, W. A. (Los Alamos Scientific Lab. NM, United States)
Heiken, G. H. (Los Alamos Scientific Lab. NM, United States)
Mroz, E. J. (Los Alamos Scientific Lab. NM, United States)
Gladney, E. S. (Los Alamos Scientific Lab. NM, United States)
Perrin, D. R. (Los Alamos Scientific Lab. NM, United States)
Leifer, R. (Los Alamos Scientific Lab. NM, United States)
Fisenne, I. (Los Alamos Scientific Lab. NM, United States)
Hinchliffe, L. (Los Alamos Scientific Lab. NM, United States)
Chuan, R. L. (Los Alamos Scientific Lab. NM, United States)
Date Acquired
August 11, 2013
Publication Date
October 1, 1982
Publication Information
Publication: NASA. Langley Research Center Atmospheric Effects and Potential Climatic Impact of the 1980 Eruptions of Mt. St. Helens
Subject Category
ENVIRONMENT POLLUTION
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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