...the transfer of cold water at depth frrom polar regions to the equator...
Water cool at the poles and ice formation leaves the remaining water saltier and denser. THis water sinks througgh the water column, and sweeps the Antarctic continent at 4km and then flows into the major ocean basins. These motions are reciprocated by the movement of the less salty, less dense surface currents which move north towards the North Atlantic for example.
These warmer waters have a signifcant effect on the temperature as they give up about a 1/3 of the energy they had previously stored from the sun.
The North Atlantic is warmer than the North Pacific, which gives rise to higher evaporation rates and salinity. THe sinking of the saltier, denser water in the North Atlantic drives the conveyor belt and, over time, the cold currents feed into the Pacific where is mixes with the warmer, less dense water fouund there, reducing water density overall.
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