Polar stratospheric clouds

Polar stratospheric clouds

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Caption: Polar stratospheric clouds over silhouetted trees at sunset. These are the nacreous or mother-of- pearl type of polar stratospheric cloud (PSC). PSCs are high-altitude icy clouds that are found in the polar stratosphere at heights of about 24 kilometres. They only form during winter when the temperature drops below around -80 degrees Celsius. PSCs play a key role in the destruction of ozone by chlorine. They convert harmless forms of chlorine into highly-reactive forms. Chlorine is carried into the stratosphere in CFCs (chlorofluorocarbons), gases used as refrigerants and during foam plastic manufacture. Photographed over Swedish Lapland.

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Keywords: arctic, climate, cloud types, clouds, cloudy, depleting, dusk, european, evening, hole, ice, icy, lapland, meteorology, mother-of-pearl, nacreous, ozone depletion, polar stratospheric clouds, scandinavian, silhouetted trees, stratosphere, sunset, sweden, swedish, twilight, weather

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