| 1. | In extremely cold temperatures above the Arctic, more polar stratospheric clouds form.
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| 2. | Separate model runs were used to determine the sustainability of the polar stratospheric clouds.
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| 3. | Polar stratospheric clouds form at very high altitudes in polar regions of the stratosphere.
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| 4. | Another requirement for polar stratospheric clouds is cold temperatures to ensure condensation and cloud production.
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| 5. | These polar stratospheric clouds ( PSC ) form during winter, in the extreme cold.
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| 6. | It also made extensive observations of volcanic aerosols and polar stratospheric clouds in the middle atmosphere.
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| 7. | Reactions that take place on polar stratospheric clouds ( PSCs ) play an important role in enhancing ozone depletion.
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| 8. | Polar stratospheric cloud production, since it requires the cold temperatures, is usually limited to nighttime and winter conditions.
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| 9. | Methane is an important factor in the creation of the primary Type II polar stratospheric clouds that were created in the early Eocene.
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| 10. | The polar stratospheric clouds had a warming effect on the poles, increasing temperatures by up to 20 �C in the winter months.
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