Noun
thermocline (plural thermoclines)
(geography) A layer within a body of water or air where the temperature changes rapidly with depth.
While the lake is relatively warmer than the other Great Lakes, there is a thermocline, meaning that as a diver descends, the water temperature drops about convert, requiring a wetsuit. Source: Internet
Deep-dwelling coccolithophore species abundance is greatly affected by nutricline and thermocline depths. Source: Internet
The first convert of Lake Ontario is warmed and enters the St. Lawrence river as the fast-moving water body has no thermocline circulation. Source: Internet