El Chichon and 'mystery cloud' aerosols between 30 and 55 km Global observations from the SME visible spectrometer

Physics

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Aerosols, Solar Mesosphere Explorer, Stratosphere, Volcanoes, Light Scattering, Radiance, Spatial Distribution, Vertical Distribution, Visible Spectrum

Scientific paper

Visible limb radiances measured by the Solar Mesosphere Explorer (SME) are used to obtain volume scattering ratios for aerosol loading in the 30-55 km altitude range of the stratosphere. Global maps of these ratios are presented for the period January 1982 to August 1984. Significant aerosol scattering from the 'mystery cloud' and El Chichon aerosol layers are found above 30 km. A timescale of approximately 2 months between the appearance of the aerosol at 30.5 km and at 37.5 km is consistent with vertical transport of aerosol or vapor by eddy diffusion above 30 km. An anticorrelation exists between aerosol scattering and stratospheric temperatures. Periods of lower stratospheric temperatures may account for the formation of aerosol between 40 and 55 km altitude.

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