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Science 2 December 1983:
Vol. 222. no. 4627, pp. 1011 - 1013
DOI: 10.1126/science.222.4627.1011
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Articles

Volcanic Aerosols and Lunar Eclipses

RICHARD A. KEEN 1

1 Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder 80309

The moon is visible during total lunar eclipses due to sunlight refracted into the earth's shadow by the atmosphere. Stratospheric aerosols can profoundly affect the brightness of the eclipsed moon. Observed brightnesses of 21 lunar eclipses during 1960-1982 are compared with theoretical calculations based on refraction by an aerosol-free atmosphere to yield globally averaged aerosol optical depths. Results indicate the global aerosol loading from the 1982 eruption of El Chichón is similar in magnitude to that from the 1963 Agung eruption.

Submitted on June 27, 1983
Accepted on August 30, 1983

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Science. ISSN 0036-8075 (print), 1095-9203 (online)