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| | | #REDIRECT: [[Mixed layer]] |
| #REDIRECT [[mixed layer]] | |
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| == mixed layer ==
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| #<div class="definition"><div class="short_definition">(Abbreviated ML; sometimes called convective mixed layer, convective boundary layer, or mixing layer in air-pollution meteorology.) A type of [[atmospheric boundary layer]] characterized by vigorous [[turbulence]] tending to stir and uniformly mix, primarily in the vertical, quantities such as conservative [[tracer]] concentrations, [[potential temperature]], and [[momentum]] or [[wind speed]].</div><br/> <div class="paragraph">Moisture is often not so well mixed, showing a slight decrease with height. The vigorous turbulence can be caused by either strong winds or [[wind shears]] that generate [[mechanical turbulence]] (called [[forced convection]]), or by buoyant turbulence (called [[free convection]]) associated with large [[thermals]]. The buoyantly generated mixed layers are usually [[statically unstable]], caused by heating at the bottom boundary such as the earth's surface or [[radiative cooling]] at the tops of [[cloud]] or [[fog]] layers within the mixed layer. The terms mixed layer, convective mixed layer, and convective boundary layer commonly imply only the buoyantly stirred layer. During fair weather over land, mixed layers are usually daytime phenomena generated buoyantly, with growth caused by [[entrainment]] of free-atmosphere air into the [[mixed-layer top]]. <br/>''See'' [[mixed-layer depth]], [[entrainment zone]], [[radix layer]], [[uniform layer]].</div><br/> </div>
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| #<div class="definition"><div class="short_definition">In [[oceanography]], a fully turbulent region of quasi-isopycnal water (i.e., virtually uniform [[potential density]]) that, in the case of the surface mixed layer, is bounded above by the air-sea [[interface]] and below by the [[transition layer]].</div><br/> <div class="paragraph">Mixed [[layer depth]] is often defined as the depth at which potential density differs from that of the surface by 0.01 kg m<sup>-1</sup>.</div><br/> </div>
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