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


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.