Volcanic eruptions are important in the way they perturb the climate and help us understand atmospheric processes. We show a new method to measure the SO2
released by explosive volcanic eruptions using the HIRS/2 satellite instrument, which measured atmospheric temperature and H2
O. We apply the technique to the 1991 eruption of Cerro Hudson, and show it’s possible to detect SO2
with a good degree of accuracy. This method and instrument can potentially generate a climate-significant record.