| 11. | The polar vortex of high-speed circulating winds occurs above southern New Zealand during the southern hemisphere spring.
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| 12. | This warming of stratospheric air can reverse the circulation in the Arctic Polar Vortex from counter-clockwise to clockwise.
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| 13. | The lack of sunlight contributes to a decrease in temperature and the polar vortex traps and chills air.
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| 14. | Within this polar vortex, over 50 percent of the lower stratospheric ozone is destroyed during the Antarctic spring.
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| 15. | The strength and position of the polar vortex shapes the flow pattern in a broad area about it.
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| 16. | These conditions occur at lower latitudes only when the core of Arctic air, called the polar vortex, swings south.
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| 17. | The polar vortex is not broken down and the wind reversal from westerly to easterly is less extensive ."
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| 18. | It was carried by the Polar vortex winds in a circle around the South Pole, returning after two weeks.
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| 19. | A polar vortex is a moving cyclone with a low-pressure, cold center where ozone is less likely to be present.
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| 20. | The weakening or strengthening of the polar vortex can alter the sea circulation more than a mile beneath the waves.
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