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cloud cover : ウィキペディア英語版
cloud cover

Cloud cover (also known as cloudiness, cloudage or cloud amount) refers to the fraction of the sky obscured by clouds when observed from a particular location. Okta is the usual unit of measurement of the cloud cover. The cloud cover is correlated to the sunshine duration as the least cloudy locales are the sunniest ones while the cloudiest areas are the least sunny places.
The global cloud cover averages around 0.68 when analysing clouds with optical depth larger than 0.1. This value is lower when considering clouds with an optical depth larger than 2 (0.56) and higher when counting subvisible cirrus clouds.
== Role in the climate system ==

Clouds play multiple critical roles in the climate system. In particular, being bright objects in the visible part of the solar spectrum, they efficiently reflect light to space and thus contribute to the cooling of the planet. Cloud cover thus plays an important role in the energetic balance of the atmosphere and a variation of it is a consequence of and to the climate change expected by recent studies.〔


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「cloud cover」の詳細全文を読む



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