Lowest part of the atmosphere directly influenced by contact with the planetary surface
Not to be confused with planetary boundaries.
This movie is a combined visualization of the PBL and wind dynamics over the Los Angeles basin for a one-month period. Vertical motion of the PBL is represented by the gray "blanket". The height of the PBL is largely driven by convection associated with the changing surface temperature of the Earth (for example, rising during the day and sinking at night). The colored arrows represent the strength and direction of winds at different altitudes.Depiction of where the planetary boundary layer lies on a sunny day.
In meteorology, the planetary boundary layer (PBL), also known as the atmospheric boundary layer (ABL) or peplosphere, is the lowest part of the atmosphere and its behaviour is directly influenced by its contact with a planetary surface.[1] On Earth it usually responds to changes in surface radiative forcing in an hour or less. In this layer physical quantities such as flow velocity, temperature, and moisture display rapid fluctuations (turbulence) and vertical mixing is strong. Above the PBL is the "free atmosphere",[2] where the wind is approximately geostrophic (parallel to the isobars),[3] while within the PBL the wind is affected by surface drag and turns across the isobars (see Ekman layer for more detail).
In meteorology, the planetaryboundarylayer (PBL), also known as the atmospheric boundarylayer (ABL) or peplosphere, is the lowest part of the atmosphere...
In physics and fluid mechanics, a boundarylayer is the thin layer of fluid in the immediate vicinity of a bounding surface formed by the fluid flowing...
The alpine planetaryboundarylayer is the planetaryboundarylayer (PBL) associated with mountainous regions. Due to its high spatial and temporal variability...
The convective planetaryboundarylayer (CPBL), also known as the daytime planetaryboundarylayer (or simply convective boundarylayer, CBL, when in context)...
Planetaryboundaries are a framework to describe limits to the impacts of human activities on the Earth system. Beyond these limits, the environment may...
local shear stress at the wall. Within the lowest portion of the planetaryboundarylayer a semi-empirical log wind profile is commonly used to describe...
planetary surface affects the flow of the air, and so forms the planetaryboundarylayer (PBL) that varies in height from hundreds of meters up to 2 km...
verification] This layer where friction slows and changes the wind is known as the planetaryboundarylayer, sometimes the Ekman layer, and it is thickest...
aerology is restricted to the free atmosphere, the region above the planetaryboundarylayer. Early pioneers in the field include Léon Teisserenc de Bort and...
surface layer. Splitting the planetaryboundarylayer into the surface layer and the Ekman layer generally yields more accurate results. The Ekman layer, with...
that are oriented approximately parallel to the ground in the planetaryboundarylayer. Although horizontal convective rolls, also known as cloud streets...
instruments can be used to measure properties of the planetaryboundarylayer, including boundarylayer height, aerosols and clouds. Satellite remote sensing...
of Earth is the layer of gases, known collectively as air, retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere. The...
of horizontal mean wind speeds within the lowest portion of the planetaryboundarylayer. The relationship is well described in the literature. The logarithmic...
communities of the planetaryboundarylayer Once aerosolized, microbial cells enter the planetaryboundarylayer, defined as the air layer near the ground...
differentiated bodies, the surface is where the crust meets the planetaryboundarylayer. Anything below this is regarded as being sub-surface or sub-marine...
[jargon] Mixing of air during the day expands the height of the planetaryboundarylayer,[jargon] leading to increased winds, cumulus cloud development...
an analogous planetaryboundarylayer). Turbulence is high in the mixed layer. However, it becomes zero at the base of the mixed layer. Turbulence again...
atmosphere" above the inversion or planetaryboundarylayer the sky has a deep blue color, unlike inside the hazy layer, where it acts like pale blue or...
meteorology to determine the intensity of the convection in the planetaryboundarylayer. Radiative flux also acts as a generalization of heat flux, which...
capping inversion is an elevated inversion layer that caps a convective planetaryboundarylayer. The boundarylayer is the part of the atmosphere which is...
minutes. The greater height of Martian dust devils may be due to a planetaryboundarylayer which is several kilometers thicker on average than Earth's. Dust...
planetary core consists of the innermost layers of a planet. Cores may be entirely solid or entirely liquid, or a mixture of solid and liquid layers as...
The boundary of the atmosphere between the troposphere and stratosphere Troposphere – The lowest layer of the atmosphere Planetaryboundarylayer – The...
The troposphere is the lowest layer of the Earth's atmosphere; it starts at the planetaryboundarylayer, and is the layer in which most weather phenomena...
Mahrt, L (1986). "A simple model of the planetaryboundarylayer: Sensitivity to surface evaporation". Boundary-Layer Meteorology. 37 (1–2): 129–148. CiteSeerX 10...
this, generally, the parcel is lifted from the portion of the planetaryboundarylayer (PBL) that lies below the morning inversion. The air here should...
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