TOMS - Total Ozone Mapping Spectrometer

TOMS is a space-based, ultraviolet spectrometer which measures sulphur dioxide erupted by volcanoes.
TOMS has measured SO₂ emissions from over 50 volcanic eruptions.
SO₂ has a strong absorption band at 300-320 nm.

Large SO₂ emissions detected by TOMS
Mt Pinatubo (1991) 20 million tonnes.
El Chichon (1982) 7 million tonnes.
Nyamuragira (1981) 4 million tonnes.
Cerro Hudson (1991) 1.5 million tonnes.
Sierra Negro (1979) 1.2 million tonnes.
 

TOMS
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