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Type I PSCs are now known as sites of harmful destruction of stratospheric ozone over the poles. Their surfaces act as catalysts, convert more benign forms of man-made chlorine to active free radicals (ex,ClO). During return of Spring sunlight these radicals destroy many ozone molecules in a series of chain reactions. Cloud formation is doubly harmful because it also removes gaseous nitric acid from stratosphere which would otherwise combine with ClO to form less reactive forms of chlorine.

Polar Stratospheric Clouds over the tropospheric cloud cover at the Southern Norway (Jan taken from the NASA aircraft at an altitude of 11 km.

Often known as Mother of Pearl clouds, nacreous clouds are an extremely rare sight. They form between nine and sixteen miles high in the atmosphere and give off a breathtaking iridescent glow. While they form mostly in the polar regions, they have been known to form across the globe during winter and at high altitudes. These beautiful clouds tend to shine brightly just before dawn or in the two hours just after sunset, making for an unforgettable sight.

Often known as Mother of Pearl clouds, nacreous clouds are an extremely rare…

Anders Gjørwad Hagen of Vinstra, Norway, photographed this nacreous cloud on Dec. 27 after hurricane Dagmar hit the coast of Norway.

Full classification: Cirrus uncinus	  Over Glen Coe, Highlands, Scotland.  © Frank Howie

Full classification: Cirrus uncinus Over Glen Coe, Highlands, Scotland.

Upper Tangent Arc from Orsta, Norway Earth Science Picture of the Day

Photographer: Geir T. Geir's Web site Summary Author: Geir T. Jim Foster This jaunty upper tangent arc (UTA) was visible in the afternoon of December from Orsta, Norway. It’s tangent to the 22 degree halo --.

Mother-of-pearl-clouds from helicopter. Antarctica Per-Andre Hoffman. (i found this by googling mother-of-pearl-clouds, but it won't let you pin from there.)

Also called mother-of-pearl-clouds or polar stratospheric clouds/ Per-Andre Hoffmann

Nacreous Clouds

Rare nacreous clouds, also called mother of pearl clouds.

10 'X-Files' Worthy Weather Phenomena: Hole Punch Clouds

10 'X-Files' Worthy Weather Phenomena

It’s called "Hole Punch Clouds". This strange phenomenon resulted from a combination of cold temperatures, air traffic, and perhaps unusual atmospheric stability.

A nacreous cloud, also know as a polar stratospheric cloud, is a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon.

A nacreous cloud, also know as a polar stratospheric cloud, is a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon.

Nacreous

Nacreous Clouds These rare clouds, sometimes called mother-of-pearl clouds, are 15 – miles) high in the stratosphere and well above tropospheric clouds.- 10 Very Rare Cloud Pictures ~ Cool Things Collection

Polar Stratospheric Clouds

Polar stratospheric clouds, They are also called nacreous or mother of pearl clouds, and display a wonderful spread of shifting colours as the sunlight gets diffracted by the tiny ice crystals forming the nebulosity.

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