Reports

Absorption of Visible Radiation by Aerosols in the Volcanic Plume of Mount St. Helens

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Science  20 Feb 1981:
Vol. 211, Issue 4484, pp. 834-836
DOI: 10.1126/science.211.4484.834

Abstract

Samples of particles from Mount St. Helens were collected in both the stratosphere and troposphere for measurement of the light absorption coefficient. Results indicate that the stratospheric dust had a small but finite absorption coefficient ranging up to 2 x 10–7 per meter at a wavelength of 0.55 micrometer, which is estimated to yield an albedo for single scatter of 0.98 or greater. Tropospheric results showed similar high values of an albedo for single scatter.

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