Series of satellite maps comparing the severe depletion or "hole" in the ozone layer over Antarctica on each 3rd October in the period 1987- 90. First observed in 1980,the hole is believed to be due to pollution of the atmosphere by chlorofluorocarbons (CFCs) used in aerosols & refrigerants. The colour scale at right shows total ozone values (in Dobson Units) - missing data appears white. The hole appears in shades of pink,with Antarctica outlined in black. The size of the hole was similar in 1987,1989 & 1990,whilst in 1988 it was reduced. The map was made by the Total Ozone Mapping Spectrometer (TOMS) on the American Nimbus-7 weather satellite | |
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Credit: | Science Photo Library / NASA |
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