Satellite map of Antarctic ozone depletion, 1999

Satellite map of Antarctic ozone depletion, 1999

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This image is part of the sequence Environment: satellite maps of the ozone hole over the Antarctic from 1999 to 2007

Credit: NASA/SCIENCE PHOTO LIBRARY

Caption: Antarctic ozone depletion. Coloured satellite map of atmospheric ozone in the southern hemisphere on October 3 1999. There is an ozone hole (pale blue) over Antarctica (dark blue). The ozone layer's thickness is measured in Dobson Units (DU) with 300 being an average figure. The map is colour- coded: yellow to orange (300-340 DU), green to blue (200-280 DU) and dark blue (100-200 DU). The ozone hole is due to atmospheric pollution by chl- orine and bromine compounds released from halons such as CFCs (chlorofluorocarbons). It is greatest around October during the Antarctic spring. Data from the TOMS (Total Ozone Mapping Spectrometer) instrument on the American TOMS-EP satellite.

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Keywords: 1999, 3/10/99, antarctic, antarctica, atmosphere, earth science, earth's, map, ozone depletion, ozone hole, sciences, toms imagery, total ozone mapping spectromet

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