The thermocline is a layer of thermal transition fast between the surface Eau X and deep water.

Indeed, in the seas and oceans, almost all the rays of the sun striking surface are absorbed by the layer of surface water which is heated then. The Wind and the Vague S make circulate this water, distributing heat so as to little close uniform on first tens of meters of depth.

Below this layer, the temperature falls very quickly, of approximately 20°C. It is the fine layer of transition between the two which one calls thermocline . Under the thermocline, the temperature continues to fall with the depth but in a way much less marked. In the oceans, 90% of water are located below this thermocline at a temperature ranging between 0 and 3°C.

The plungers in tuba, can also observe a thermocline few degrees on the first meters of water mainly in summer.

In Lake and pond exists also a thermocline . This one behaves rather differently that at sea. Indeed, one observes, twice a year, an inversion of layer between major level and surface level. Microphone-currents make run the surface layer in spring and the beginning of the winter, allowing the survival of fish close to the bottom (water more fraiche and better oxygenated in summer, and more moderate in winter).