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 * Internet Search Results * 

Polar stratospheric cloud - Wikipedia
Polar stratospheric clouds or PSCs, also known as nacreous clouds (/ ˈ n eɪ k r i ə s /, from nacre, or mother of pearl, due to its iridescence), are clouds in the winter polar stratosphere at altitudes of 15,000–25,000 meters (49,000–82,000 ft). 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 ...

Polar Stratospheric Clouds
Polar Stratospheric Clouds. The colorful clouds near the top of this picture are Polar Stratospheric Clouds (PSCs). The PSCs are flying high above the darker cirrus clouds at the bottom of the picture.

Nacreous clouds - Atmospheric Optics
Nacreous clouds, sometimes called mother-of-pearl clouds, are rare but once seen are never forgotten. They are mostly visible within two hours after sunset or before dawn when they blaze unbelievably bright with vivid and slowly shifting iridescent colours.

Glossary of Terms: P - Physical Geography
Pacific High High pressure system that develops over the central Pacific Ocean near the Hawaiian Islands. Also called the Hawaiian High. Paleoclimate Climatic conditions in the geological past reconstructed from a direct or indirect data source.

The Ozone Hole
Ozone Destruction. NASA Earth Observatory (Illustration courtesy Barbara Summey, SSAI) Understanding Stratospheric Ozone Depletion . Our understanding of stratospheric ozone depletion has been obtained through a combination of laboratory studies, computer models, and atmospheric observations.

Polar Vortex & Ozone Hole (Ozone Depletion) | PMF IAS
Table of Contents1 Polar Vortex2 Polar Vortex Cold Wave2.1 How it slips3 Ozone Hole [Ozone Depletion at South Pole]3.1 Halogen atoms like chlorine destroy ozone4 Polar Stratospheric Clouds (PSCs)4.0.1 Nacreous clouds4.0.2 Prelims question: The formation of ozone hole in the Antarctic region has been a cause of concern. What could be the reason for ozone […]

Eocene - Wikipedia
The Eocene ( / ˈ iː ə ˌ s iː n, ˈ iː oʊ-/) Epoch, lasting from , is a major division of the geologic timescale and the second epoch of the Paleogene Period in the Cenozoic Era. The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope 13 C in ...

Search Image Gallery | International Cloud Atlas
The WMO International Cloud Atlas is the reference for the classification of clouds and meteorological meteors. It provides the definitions and descriptions of cloud types and meteors, and flow charts to help identify them.