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Science. 1981 Feb 20;211(4484):832-4.

Size distributions and mineralogy of ash particles in the stratosphere from eruptions of mount st. Helens.

Abstract

Samples from the stratosphere obtained by U-2 aircraft after the first three major eruptions of Mount St. Helens contained large globules of liquid acid and ash. Because of their large size, these globules had disappeared from the lower stratosphere by late June 1980, leaving behind only smaller acid droplets. Particle-size distributions and mineralogy of the stratospheric ash grains demonstrate in-homogeneity in the eruption clouds.

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