Spectral extinction of direct solar radiation by the El Chichon cloud during December 1982
- 1 November 1983
- journal article
- Published by American Geophysical Union (AGU) in Geophysical Research Letters
- Vol. 10 (11) , 1013-1016
- https://doi.org/10.1029/gl010i011p01013
Abstract
Stratospheric aerosol optical depths at five discrete solar wavelengths are calculated from solar extinction measurements made on board a NASA (National Aeronautics and Space Administration) Convair 990 aircraft between 55°N and 6°S latitude during December 1982. The latitudinal and spectral variations of the aerosol optical depths, presumed to be due to effluents from the eruptions of El Chichon, show a north to south separation into two components, each with a characteristic spectral signature. The average aerosol optical depth, both spatially and spectrally, was 0.10 ± 0.01. Calculations indicate that this enhancement is sufficient to cause an 18% decrease in direct broadband solar irradiance at a representative zenith angle of 60°.Keywords
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