This figure (unpublished results) shows MLS measurements on 21 April 1993 (left panels) and 22 April 1993 (right panels) of sulfur dioxide (SO2) at 46 hPa pressure (about 20 km height, top panels) and at 100 hPa pressure (about 15 km height, bottom panels). Red colors indicate SO2 abundances of 20 parts per billion by volume or greater and are evident on the 46 hPa map which identify SO2 injected into the stratosphere by the Lascar volcano; some evidence of the Lascar injection is also seen on the 100 hPa maps.
The Lascar volcano erupted on 20 April 1993, and is located approximately 170 km from Calama in northern Chile.
See Read, et al. [Geophys. Res. Lett. 20, 1299-1302, 1993] for description of how MLS measures SO2, and analyses of data on SO2 from the Pinatubo volcano.
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