Decreases in the Ozone and the S02 Columns Following the Appearence of the El Chichon Aerosol Cloud at Midlatitude

Measurements of S02 column at Thessaloniki (41°N) show a minimum in the late spring of 1983, approximately three months after the occurence of the maximum of the El Chichon aerosol in the stratosphere at these latitudes. It is suggested that the injection of the aerosol into the upper troposphere provides a scavenging mechanism for S02 and other trace gases.