Latitude survey of aerosol optical thickness of the El Chichon eruption cloud in May 1983

Physics

Scientific paper

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Aerosols, Air Pollution, Optical Thickness, Stratosphere, Volcanoes, Mexico, Photometers, Solar Radiation, Sulfur Dioxides

Scientific paper

The results of measurements of the latitudinal distribution of the El Chichon eruption cloud in May 1983 for the latitude range between 71 deg N and 56 deg S are presented. Aerosol optical thicknesses are calculated from solar spectral extinction measurements made with a sunphotometer on board the NASA Convair 990 aircraft. It is shown that the thicknesses vary in the range between 0.12 and 0.01, that a maximum of about 0.12 is found at middle latitudes, and that distinct minima of 0.01-0.02 are observed at 25-deg latitude in both hemispheres. The median radius of particles is found to be between 0.16 micron and 0.18 micron in the northern hemisphere and between 0.11 micron and 0.15 micron in the southern hemisphere. Rough estimates of aerosol mass indicate that about 1.5 megatonnes of aerosol still persisted in the stratosphere between the equator and 25-deg N one year after the eruption.

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