Nimbus 7 satellite measurements of the springtime Antarctic ozone decrease

Measurements from the Solar Backscatter Ultraviolet instrument and the Total Ozone Mapping Spectrometer aboard the Nimbus 7 satellite, a sun-synchronous polar-orbiting satellite which passes any given point on the dayside near local noon, are reported. These provide global measurements of ozone from November 1978 to the present which confirm the reported decline in total ozone in the Antarctic region and show the phenomenon to be regional in extent. The decrease occurs during September as the sun rises, reaching a minimum in mid-October. Seven years (1979-1985) of October monthly means show a 40 percent decrease in the ozone minimum and a 20 percent decrease in the surrounding ozone maximum.