Lidar Monitoring at mid latitude of the stratospheric aerosol perturbation produced by the El Chichón eruption
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Abstract
We report lidar measurements of the perturbation in the atmospheric dust load produced by the El Chichón volcanic eruption. The measurements extend for a 19 month period and are taken at a mid-latitude station. Analysis of the backscattering ratio and integrated backscattering as a function of altitude show that until the end of summer 1982, optical thickness was contributed mainly by high altitude (≥ 25 km) layers. Since the fall of 1982 the main cloud arrival at mid latitude formed a broad single !ayer extending from 15 to 30 km. Slow decay in the altitude of this layer, 7 - 8 km in 12 months, is attributed to a contribution of general circulation and settling velocity of the dust particles. It is shown that our optical thickness data are consistent with similar independent measurements.
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References
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