You searched for: “thermohaline convections
thermohaline convection (s) (noun), thermohaline convections (pl)
The vertical movement of a layer of water caused by changes in the temperature-salinity relationship resulting in it becoming heavier than the water below it: Thermohaline convection is a kind of hydrodynamic instability and arrises due to one layer becoming colder or more saline, or both, and thus more dense.