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This is a phenomenon that occurs during the polar winter
in which stratospheric air moves in a circular motion, with an area of
relatively still air in its center. The temperature in the vortex is
approximately -130 degrees F (-80 degrees C), which assists in the formation of
polar stratospheric clouds. Though usually more prolonged and colder over
Antarctica, the Arctic polar vortex does form to a degree, and when the
temperatures there are coldest and the vortex persists, Arctic stratospheric
ozone destruction on Arctic polar stratospheric clouds has also been observed.
[Science; v251; 46-52; 1991.] [Journal of the Atmospheric Sciences; v51;
2973-2994; 1994.] [Elements: Air; Michael Allaby; page 160; 1992; Facts on File
Inc; New York.] [Antarctica; Carl Eklund and Joan Beckman; page 83; 1963; Holt,
Rinehart and Winston, Inc; New York.]
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