Changes in the sub-2.5 micron diameter aerosol observed at 20 km altitude after the eruption of El Chichon

Details Changes in the sub-2.5 micron diameter aerosol observed at 20 km altitude after the eruption of El Chichon Changes in the sub-2.5 micron diameter aerosol observed at 20 km altitude after the eruption of El Chichon

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10.1029w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, Nov. 1983, p. 1029-1032.

Physics

8

Aerosols, Particle Size Distribution, Particulate Sampling, Sulfur Dioxides, Volcanoes, Aircraft Instruments, Clouds, Standard Deviation

Scientific paper

Measurements of sub-2.5 micron aerosol concentration were made from a NASA U-2 aircraft by several experimenters before and after the eruptions of El Chichon in March and April of 1982. Concentrations of sub-2.5 micron diameter particles encountered between 19.6 and 21.6 km altitude were nearly uniform over large distances in regions thought to be unaffected by El Chichon. Comparisons of measurements made with three instruments suggest that particles smaller than 0.1 micron in diameter contributed significantly to the number distribution of these non-El Chichon aerosols. Measurements of large concentrations of sub-0.1 micron particles in April and May 1982 imply that new particle formation occurred following the eruption. Measurements made in November and December, 1982 showed decreased numbers of sub-0.1 micron particles compared to the non-El Chichon measurements. Simultaneous measurements of SO2 and aerosol volume concentrations made on the lower edge of the volcanic cloud two weeks after the eruption permitted a range of SO2 conversion rates to be estimated.

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