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Clouds And Sky
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by Lisa Wooten
Title
Clouds And Sky
Artist
Lisa Wooten
Medium
Photograph - Photographs
Description
In meteorology, a cloud is an aerosol comprising a visible mass of liquid droplets or frozen crystals, both of which are made of water or various chemicals. The droplets or particles are suspended in the atmosphere above the surface of a planetary body.[1] On Earth clouds are formed by the saturation of air in the homosphere (which includes the troposphere, stratosphere, and mesosphere) when air cools or gains water vapor. The science of clouds is nephology which is undertaken in the cloud physics branch of meteorology.
Cloud types in the troposphere, the atmospheric layer closest to Earth's surface, have Latin names due to the universal adaptation of Luke Howard's nomenclature. It was formally proposed in December 1802 and published for the first time the following year. It became the basis of a modern international system that classifies these tropospheric aerosols into five physical forms; stratiform, stratocumuliform, cirriform, cumuliform, and cumulonimbiform. Most of these forms can be found in the high, middle, and low altitude levels or �tages of the troposphere, although cirriform clouds only occur in the high altitude range. The forms and �tages are cross-classified to produces ten basic genus-types or genera. A cloud genus can therefore be defined as any physical form that is particular to a given �tage, or simultaneosly to more than one �tage if the genus-type has significant vertical extent. Most genera can be divided into species that are often subdivided into varieties where applicable.
Clouds that form higher up in the stratosphere and mesosphere have common names for their main types, but are sub-classified alpha-numerically rather than with the elaborate system of Latin names given to cloud types in the troposphere. They are relatively uncommon and are mostly seen in the polar regions of Earth. Clouds have been observed on other planets and moons within the Solar System, but, due to their different temperature characteristics, they are often composed of other substances such as methane, ammonia, and sulfuric acid as well as water.This article is about Earth's sky. For other skies, see extraterrestrial skies. For other uses, see Sky (disambiguation).
The sky above the clouds
The sky (or celestial dome) is everything that lies above the surface of the Earth, including the atmosphere and outer space.
In the field of astronomy, the sky is also called the celestial sphere. This is viewed from Earth's surface as an imaginary dome where the sun, stars, planets, and the moon are seen to be traveling. The celestial sphere is conventionally divided into regions called constellations. Usually, the term sky is used informally as the point of view from the Earth's surface; however, the meaning and usage can vary. In some cases, such as in discussing the weather, the sky refers to only the lower, more dense portions of the atmosphere.
During daylight, the sky appears to be blue because air scatters blue sunlight more than it scatters red.[1][2][3][4] At night, the sky appears to be a mostly dark surface or region scattered with stars. During the day, the Sun can be seen in the sky unless obscured by clouds. In the night sky (and to some extent during the day) the moon, planets and stars are visible in the sky. Some of the natural phenomena seen in the sky are clouds, rainbows, and aurorae. Lightning and precipitation can also be seen in the sky during storms. Birds, insects, aircraft, and kites are often considered to fly in the sky. Due to human activities, smog during the day and light pollution during the night are often seen above large cities. Wikipedia
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April 25th, 2016
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