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nacreous clouds |
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nacreous clouds [′nā·krē·əs ′klau̇dz] (meteorology) Clouds of unknown composition, whose form resembles that of cirrus or altocumulus lenticularis, and which show very strong irisation similar to that of mother-of-pearl, especially when the sun is several degrees below the horizon; they occur at heights of about 12 or 18 miles (20 or 30 kilometers). Also known as mother-of-pearl clouds. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Scientists have known for some time that ozone lows are often associated with extremely low temperatures in the stratosphere and the presence of polar stratospheric clouds, which provide the template for the chemical reactions that destroy ozone. Polar stratospheric clouds look lovely, glowing in streaks of spring Antarctic or Arctic sunrise. Using planes and high-altitude balloons, the scientists' goal was to analyze the internal life of the polar stratospheric clouds that exist at the center of a vortex, a sort of cold giant tornado whose furious winds seal off warm air. |
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