Thermocline
10 definitions

Thermocline

The layer of maximum vertical temperature gradient in the ocean, lying between the surface ocean and the abyssal ocean. In sub- tropical regions, its source waters are typically surface waters at higher latitudes that have subducted (see Subduction) and moved equatorward. At high latitudes, it is sometimes absent, replaced by a halocline, which is a layer of maximum vertical salinity gradient.

Thermocline

The middle layer of a thermally stratified lake or reservoir. In this layer, there is a rapid decrease in temperatures in a lake or reservoir.

Thermocline

The middle layer of a lake, separating the upper, warmer portion (epilimnion) from the lower, colder portion (hypolimnion). The middle layer in a thermally stratified lake or reservoir. In this layer there is a rapid decrease in temperature with depth.

Thermocline
"thermocline": the region below the surface layer of the ocean or lake, where the temperature gradient increases abruptly (i.e. where temperature decreases rapidly with increasing depth). A thermocline may reach the surface and become a front. It is usually an ecological barrier and its oscillations have significant consequences on population distribution and ocean productivity
Thermocline

Region below the surface layer of the sea or lake, where the temperature gradient increases abruptly. A thermocline may reach the surface and become a front. It is usually an ecological barrier, and its oscillations have significant consequences on stock distribution and ocean productivity.

Thermocline
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A layer in which the temperature decreases significantly (relative to the layers above and below) with depth. The principal ones are designated diurnal, seasonal, and main thermocline.

Thermocline

A transition layer of water in the ocean, with a steeper vertical temperature gradient than that found in the layers of ocean above and below. The permanent thermocline separates the warm mixed surface layer of the ocean from the cold deep ocean water, and is found between 100- and 1000-m depths. The thermocline first appears at the 55(em60° N and S latitudes, where it forms a horizontal separation between temperate and polar waters. The thermocline reaches its maximum depth at mid-latitudes and is shallowest at the equator and at its northern and southern limits. The thermocline is stably stratified, and transfer of water and carbon dioxide across this zone occurs very slowly. Thus, the thermocline acts as a barrier to the downward mixing of carbon dioxide.

Thermocline

As one descends from the surface of the ocean, the temperature remains nearly the same as it was at the surface, but at a certain depth temperature starts decreasing rapidly with depth. This boundary is called the thermocline. In studying the tropical Pacific Ocean, the depth of 20oC water ("the 20oC isotherm") is often used as a proxy for the depth of the thermocline. Along the equator, the 20oC isotherm is typically located at about 50m depth in the eastern Pacific, sloping downwards to about 150 m in the western Pacific.

Thermocline

As one descends from the surface of the ocean. the temperature remains nearly the same as it was at the surface. but at a certain depth temperature starts decreasing rapidly with depth. This boundary is called the thermocline. In studying the tropical Pacific Ocean. the depth of 20�C water ('the 20�C isotherm') is often used as a proxy for the depth of the thermocline. Along the equator. the 20�C isotherm is typically located at about 50m depth in the eastern Pacific. sloping downwards to about 150m in the western Pacific.

Thermocline

A vertical temperature gradient, in some layer of a body of water, that is appreciably greater than the gradients above and below it; also a layer in which such a gradient occurs.

The permanent thermocline refers to the thermocline not affected by the seasonal and diurnal changes in the surface forcing; it is therefore located below the yearly maximum depth of the mixed layer and the influence of the atmosphere. The seasonal thermocline refers to the thermocline not affected by the diurnal changes in the surface forcing. In general, it is established each year by heating of the surface water in the summer, and is destroyed the following winter by cooling at the surface and wind-driven mixing. The diurnal thermocline refers to the thermocline that, in general, is established each day by heating of the surface water and is destroyed the following night by cooling and/or mixing.

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About this term

Thermocline has been defined 10 different ways in documents like IPCC, 2013- Annex III-Glossary, FRTR Glossary, Reclamation Glossary, and 7 more.

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