The planetary boundary layer (PBL) is the section of the Earth's atmosphere that is closest to the ground, and within which wind is influenced by friction with the Earth's crust.
Planetary Boundary Layer (PBL) - the layer within the atmosphere between 1 km and the earth's surface where friction affects wind speed and wind direction.
Planetary Scale - see global scale ...
Planetary Boundary Layer-The atmospheric boundary layer from the surface to the level where the frictional influence is absent.
Pressure-The force exerted by the interaction of the atmosphere and gravity.
PBL- Planetary Boundary Layer. The lowest level of the atmosphere where friction is an important force and vertical mixing is common.
PCPN- Precipitation
PD- Period ...
Same as Planetary Boundary Layer; the layer within the atmosphere between the earth's surface and 1 km above the surface; this is the layer where friction affects wind speed and wind direction.
FRMG
Forming ...
This layer is only a portion of the planetary boundary layer, and represents the layer within which friction effects are more or less constant throughout (as opposed to decreasing with height, as they do above it).
Specifically, the term most often refers to the planetary boundary layer, which is the layer within which the effects of friction are significant.
planetary boundary layerTop of the planetary boundary layer; also known as depth or height of the mixing layer.potential energyThe energy that a body possesses by virtue of its position with respect to other bodies in the field of gravity.
They usually form within the lower one to three kilometers of the atmosphere known as the planetary boundary layer and are caused by convection when the wind direction is relatively constant with height.
free atmosphere - (Sometimes called free air.) That portion of the earth's atmosphere, above the planetary boundary layer, in which the effect of the earth's surface friction on the air motion is negligible, ...
The earth's atmosphere extending upward from above the planetary boundary layer (or above altitudes ranging between 1-2 kilometers above ground level), where effects of the earth's surface friction upon air motion are negligible.
frequency ...
planetary boundary layer The transition region between the turbulent surface layer and the normally nonturbulent free atmosphere.
Stagnation area In air pollution meteorology this refers to a region of the lower atmosphere (planetary boundary layer) near the surface where the following conditions persist for at least 4 days: wind speeds less than 17 mph (poor ventilation), ...
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Friction Layer, Meteogram, Planetary Boundary Layer, Variable Wind Direction
Variable Wind Direction - permalink - collapse
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An idealised description of the way wind-driven ocean currents vary with depth. In the atmosphere, it represents the way the wind varies from the surface upwards in the planetary boundary layer.
lower case represents turbulence values (fluctuations from the mean), w represents vertical velocity, density, and the bar represents the mean over a chosen period. By analogy with molecular diffusion, the eddy flux in the planetary boundary layer is ...
Friction HeadIn hydrologic terms, the decrease in total head caused by frictionFriction LayerSame as Planetary Boundary Layer; the layer within the atmosphere between the earth's surface and 1 km above the surface; ...
 See also: Layer, Boundary Layer, Surface, Wind, Air
  
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