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.
At night cloud cover has the opposite effect. If skies are clear, heat emitted from the earth's surface freely escapes into space, resulting in colder temperatures. However, if clouds are present, some of the heat emitted from the earth's surface is trapped by the clouds and reemitted back towards the earth.
Cloud cover has an impact on Earth's weather and climate. Here, we will examine the different types of cloud cover and their effects, followed by a brief quiz. 2015-07-22
On the Relationship between Stratiform Low Cloud Cover and Lower-Tropospheric Stability ROBERT WOOD AND CHRISTOPHER S. BRETHERTON University of Washington, Seattle, Washington (Manuscript received 25 January 2006, in final form 12 May 2006)
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Stratocumulus clouds appear as lumpy, low lying clouds that cover much of the sky. They form patches or rows of clouds with some blue sky between the individual cloud units. Figure 7.25 Nimbostratus cloud (Source NOAA. Click image to enlarge) Nimbostratus clouds are dark-gray layer of clouds that cover the entire sky. The prefix "nimbo ...
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High values of low cloud cover are associated with low global temperatures, demonstrating the cooling effect of low clouds. A simple linear fit model suggests that an increase in global low cloud cover of 1 percent corresponds to a global temperature decrease of about 0.06 o C. From a simple statistical point of view, this model explains about ...
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