Internal boundary layer

internal boundary layer

(Abbreviated IBL.) A layer within the atmosphere bounded below by the surface, and above by a more or less sharp discontinuity in some atmospheric property.

Internal boundary layers are associated with the horizontal advection of air across a discontinuity in some property of the surface (e.g., aerodynamic roughness length or surface heat flux) and can be viewed as layers in which the atmosphere is adjusting to new surface properties.
See thermal internal boundary layer, mechanical internal boundary layer.

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1. The layer of fluid near a boundary that is affected by friction against that boundary surface, and possibly by transport of heat and other variables across that surface.

1. A gaseous envelope gravitationally bound to a celestial body (e.g., a planet, its satellite, or a star).