A pycnocline is the cline or layer where the density gradient ({frac|∂ρ|∂z}) is greatest within a body of water. An ocean current is generated by the forces such as breaking waves, terms of temperature and salinity differences, wind, Coriolis effect, and tides caused by the gravitational pull of the Moon and the Sun. In addition, the physical...
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http://en.wikipedia.org/wiki/Pycnocline
(from the article `ocean`) In some areas of the ocean, generally during the winter season, cooling or net evaporation causes surface water to become dense enough to sink. ... [3 related articles]
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http://www.britannica.com/eb/a-z/p/136
A vertical density gradient (as determined by the vertical temperature and salinity gradients and equation of state) in some layer of a body of water, which is appreciably greater than the gradients above and below it; also a layer in which such a gradient occurs. The principal pycnoclines in the ocean are either seasonal, due to heating of the sur...
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http://www.encyclo.co.uk/local/20124
Depth zone within which sea-water density changes maximally
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https://www.encyclo.co.uk/local/20125
In the ocean, a region where the water density increases rapidly with depth.
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https://www.encyclo.co.uk/local/20128
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