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A thermocline (also known as the thermal layer or the metalimnion in lakes) is a thin but distinct layer in a large body of fluid (e.g. water, such as an ocean or lake, or air, such as an atmosphere) in which temperature changes more rapidly with depth than it does in the layers above or below.
Thermocline is defined by having increased temperatures in the  surface water but cold water temperatures in the deep sea due to  sunlight being unable to penetrate ocean wa â¦ ters the deeply.hermocline is the level in the ocean/sea water that dramatically DECREASES in temperature, and the halocline is the level in the ocean/sea water that dramatically INCREASES i â¦ n temperature.