A technique is given to determine the effective radius, aerosol surface area density and aerosol volume density of stratospheric aerosols from the measurements by the Improved Stratospheric and Mesospheric Sounder (ISAMS) of emitted radiance at 12.1 μm. It is shown that the Mt. Pinatubo aerosol cloud had a volume density of about 9 μm3 cm-3 a surface area density of 42 μm2 cm-3 and an effective particle radius of 0.6 μm. Using an estimate of aerosol acidity from thermodynamic calculations, the liquid H2SO4 content within the aerosols can be found. This is shown to be a better tracer of atmospheric motion than the raw extinction value, as variations due to temperature features are reduced. It is also shown that the acid mass contained in the Pinatubo cloud between the 100 and 5 mb levels reached a maximum of ~ 19.5 megatonnes of H2SO4 at the start of 1992.
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- Properties of the Mt. Pinatubo Aerosol Cloud Determined from ISAMS Measurements at 12.1 μm
R. G. Grainger
C. D. Rodgers
F. W. Taylor
- Springer Berlin Heidelberg