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ROBERT M CAREY, NOAA / SCIENCE PHOTO LIBRARY ROBERT M CAREY, NOAA / SCIENCE PHOTO LIBRARY
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Global effect of Mt Pinatubo's eruption. Two false-coloured maps of the world, showing the distribution of volcanic aerosols in the atmosphere, immediately after the eruption of Mt Pinatubo (top) and two months later (bottom). Aerosol concentration is shown as shades of yellow, from brown (lowest) to white (highest). Mt Pinatubo, in the Philippines, erupted on 16 June 1991. The top image (19-27 June) shows a near- normal aerosol distribution, with only a slight increase over the Indian Ocean. The bottom image (8-14 August) shows a vast aerosol plume around the equator. The data for these images were gathered by the polar-orbiting NOAA-11 satellite.
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