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Cloud cover (also known as cloudiness, cloudage, or cloud amount) refers to the fraction of the sky obscured by clouds on average when observed from a particular location. [2] Okta is the usual unit for measurement of the cloud cover.
The cloudiness of each section is estimated on a scale of 0 to 10: zero meaning no clouds and 10 entirely overcast. The observer would then rotate the mirror and eyepiece 180 degrees and observes the cloudiness in sections 7, 5, and 2, which represent the regions of the sky that at the first observation corresponded to sections 8, 9, and 10.
Cloudiness tends to be least prevalent near the poles and in the subtropics close to the 30th parallels, north and south. The latter are sometimes referred to as the horse latitudes . The presence of a large-scale high-pressure subtropical ridge on each side of the equator reduces cloudiness at these low latitudes. [ 112 ]
The Diagnostic and Statistical Manual of Mental Disorders (DSM) has historically used the term in its definition of delirium. [7] The DSM-III-R and the DSM-IV replaced "clouding of consciousness" with "disturbance of consciousness" to make it easier to operationalize , but it is still fundamentally the same thing. [ 8 ]
Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key test of both water clarity and water quality. Fluids can contain suspended solid matter consisting of particles of many different sizes.
A counteracting positive feedback loop considers the rising of the high cloud layer, reduction in the vertical distribution of cloudiness, and decreased albedo. [ 9 ] Air pollution can result in variation in cloud condensation nuclei, creating a feedback loop that influences atmospheric temperature, relative humility, and cloud formation ...
Usually, within the lower atmosphere (the troposphere) the air near the surface of the Earth is warmer than the air above it, largely because the atmosphere is heated from below as solar radiation warms the Earth's surface, which in turn then warms the layer of the atmosphere directly above it, e.g., by thermals (convective heat transfer). [3]
Scale of cloud cover measured in oktas (eighths) with the meteorological symbol for each okta. In meteorology, an okta is a unit of measurement used to describe the amount of cloud cover at any given location such as a weather station.