Abstract
The results of lidar measurements of the stratospheric aerosol increases after the El Chichón eruption are reviewed. The eruption of El Chichón loaded about 10 Tg sulfuric acid aerosols in the stratosphere. The aerosols rounded the earth in about three weeks and dispersed towards the poles gradually. It is conjectured on the basis of depolarization meaeurements that a lare amount of volcanic ash was also injected into the stratosphere.
The stratospheric aerosols scatter the solar radiation and cool the ground, while they absorb the radiation, heating the stratsphere. Some model calculations are also reviewed to evaluate the effects of the stratospheric aerosols loaded by the El Chichbn eruption on the temperature.
