mother-of-pearl cloud

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Related to Polar stratospheric cloud: Polar vortex
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Noun1.mother-of-pearl cloud - a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon
cloud - a visible mass of water or ice particles suspended at a considerable altitude
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The chemical reactions that produce ozone-destructive chlorine compounds occur on the surfaces of cold polar stratospheric cloud and aerosol particles," said Lamont Poole, a co-author of the paper and a scientist at NASA's Langley Research Center in Hampton, Va.
Highlights of the image include a volcanic plume over the equator near the Philippines and a large polar stratospheric cloud above Antarctica.
During the Arctic winter, cool temperatures in the stratosphere form polar stratospheric clouds.
Key chemical reactions that lead to ozone depletion happen on the surface of rare polar stratospheric clouds (PSCs), which form high up in the atmosphere.
Meteorological officer Renae Baker captured spectacular images of the nacreous clouds, also known as polar stratospheric clouds, on July 25.
Polar stratospheric clouds, which drive ozone loss in Antarctica, turned up in force during the most recent Arctic winter (157: 356*).
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.
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.
Rowland and Molina predicted that ozone depletion would be global, but Fraser says it is now known that ozone-depleting reactions are greatly enhanced in the unique environment of polar stratospheric clouds, on super-cooled water droplets or ice crystals nucleated by tiny, frozen droplets of nitric acid solution.