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Encyclopedia > Atmospheric boundary layer

See Planetary boundary layer. The planetary boundary layer (PBL) is an atmospheric layer where physical quantities (flow velocity, temperature, moisture etc) are considerably affected by rapid fluctuations (Turbulence) resulting from the flow interaction with the earths surface. ...

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AMS Glossary (216 words)
The ABL depth (i.e., the inversion height) is variable in time and space, ranging from tens of meters in strongly statically stable situations, to several kilometers in convective conditions over deserts.
During daytime, a mixed layer of vigorous turbulence grows in depth, capped by a statically stable entrainment zone of intermittent turbulence.
During nighttime, the bottom of the residual layer is transformed into a statically stable boundary layer by contact with the radiatively cooled surface.
Atmospheric boundary layer - definition of Atmospheric boundary layer in Encyclopedia (211 words)
The Atmospheric boundary layer (ABL) is the portion of the atmosphere most affected by the sun's heating of the Earth's surface, and by friction.
The layers from bottom to top in the ABL consist of a surface layer, convective mixed layer and entrainment zone, which consists of a temperature inversion.
The ABL is important meteorologically in terms of assessing of convective instability.
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