An ocean or lake mixed layer is a layer in which active turbulence has homogenized a specific depth range. The surface mixed layer is the layer created by processes such as evaporation and sea ice formation in which this turbulence results in increased wind surface heat fluxes or salinity.
A mixed atmosphere is a zone of nearly constant potential temperature and specific humidity depending on altitude. The depth of the atmospheric mixing layer is called the mixing height. Turbulence usually plays a role in the formation of mixed fluid layers.
Depth at which surface temperature drops by 0.2°C, black dashed line. The density-defined mixed layer Dsigma is the red dashed line at 40 m and is defined as the surface density plus the density difference caused by a temperature rise of 0.2 °C.
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