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50.2 MB (1.5 MB compressed)
4106 x 4276 pixels
34.8 x 36.3 cm ⏐ 13.7 x 14.3 in (300dpi)
NASA, COLOURED BY JOHN WELLS / SCIENCE PHOTO LIBRARY NASA, COLOURED BY JOHN WELLS / SCIENCE PHOTO LIBRARY
Satellite map showing a severe depletion or "hole" in the ozone layer over Antarctica on October 5th, 1989. The hole is probably due to pollution of the atmosphere by chlorofluorocarbons used in aerosols & refrigerants. First observed in 1980, the hole reaches a maximum in October, in Antarctic spring. It is seen here as the regions in shades of pink, yellow & light blue covering Antarctica (outlined in black) & a little beyond. The colours represent Dobson units, a measure of atmospheric ozone. The map was made by the Total Ozone Mapping Spectrometer (TOMS) on the American Nimbus-7 satellite, & coloured at Science Photo Library.
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