why are polar stratospheric clouds dangerous

Polar stratospheric clouds. Below: Dangerous beauty. During the continuously dark polar winter, the air inside the polar vortices becomes extremely cold, a necessary condition for polar stratospheric cloud formation. These are best observed during winters in more northerly latitudes. Polar stratospheric clouds can form at temperatures below about 195 K. Chemical reactions on the surfaces of the particles that form these clouds convert chlorine compounds from inert forms into highly reactive species. The clouds Polar stratospheric clouds (PSCs) are the exception. These beautiful images of polar stratospheric clouds were taken over Tromso City in Norway. Figure Q10-2. The nitric acid in polar stratospheric clouds reacts with chlorofluorocarbons to form chlorine, which catalyzes the photochemical destruction of ozone [3, 34]. Polar stratospheric clouds create the conditions for drastic ozone destruction, providing … Arctic ozone decreases of as much as 40 percent have been measured. They are best observed during civil twilight, when the Sun is between 1 and 6 degrees below the horizon, as well as in winter and in more northerly latitudes. PSCs appear in the lower stratosphere near the poles in winter. Though nacreous clouds are officially known as "polar stratospheric clouds", they are now common over Scotland, and have been observed as far south as the Midlands. This means more dangerous UV radiation will reach the Earth's surface. Polar stratospheric clouds (PSCs) are clouds in the winter polar stratosphere at altitudes of 15,000–25,000 m (49,000–82,000 ft). The particles grow from the con-densation of water and nitric acid (HNO3). The polar vortex and polar stratospheric clouds exist only over Antarctica, which is why the ozone "hole" exists only there. Also known as nacreous clouds, these are the clouds that form in the winter polar stratosphere. This photo-graph of an Arctic polar stratospheric cloud (PSC) was taken from the ground at Kiruna, Sweden (67°N), on 27 January 2000. Meanwhile, chlorine concentrations build up during the polar winter, and consequent ozone destruction is greatest when the sunlight returns in polar winter . Polar stratospheric clouds (PSCs) are common in … Then, there is the formation of Polar Stratospheric Clouds (PSCs). "A 'warm' polar stratosphere is typically in the temperature range -73 o to -63 o C. Of course, as soon as the wave has dissipated, the polar region begins to cool down again." Polar mesospheric clouds (PMCs) are a diffuse scattering layer of water ice crystals near the summer polar mesopause. PSCs form during winters in the Arctic and Antarctic stratospheres. While the clouds look amazing, they can be potentially quite dangerous to our planet. A polar winter vortex also forms in the Northern Hemisphere. Description. 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