Physics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..255s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 12, May 1985, p. 255-258. NASA-supported research.
Physics
4
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.
Evans Wayne F. J.
Shah G. M.
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