Abstract
Eruption of Mexico's Ei Chichon volcano in Apr. 1982 produced a long-lasting stratospheric cloud composed mainly of concentrated sulfuric acid. The optical depth of the El Chichon cloud is an order of magnitude greater than that of any other volcanic cloud to cover the Northern Hemisphere since the 1312 eruption of Alaska's Mt. Katmai, and it is comparable with that from the 1883 Krakatoa eruption and that of the Southern Hemisphere cloud produced by the 1963 eruption of Mt. Agung.
© 1983 Optical Society of America
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