Abstract
The laser-radar system, consisting of a ruby laser as the emitter, has been used to map the aerosol layer centered at 20 km. Scattering measurements were made in two polarizations. Changes as a function of time in the number density were detected by use of an analysis method which requires no assumption on the air density profile. The number density variations were observed from an analysis of the depolarization of the backscattered fight. The results were compared to those obtained in different sites over the whole globe and the heights of the maximum concentration vs latitude are presented. Regular measurements of the stratospheric aerosol profile are being carried out in order to detect future concentration variations due to volcanic eruptions or other possible dust sources. The profile describes the altitude dependence of the aerosol concentrations between 7.5–22.5 km, by use of a multi-channel scaler.
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