What is the Cause of the DEEP Oceanic Currents?

Question

Is it solar, wind....?

Answer 1

Deep ocean currents are caused by differences in water temperature and salinity. The currents are generated from the forces acting upon the water like the earth's rotation, the wind, the temperature and salinity differences and the gravitation of the moon. The depth contours, the shoreline and other currents influence the current's direction and strength. Deep ocean currents are driven by density and temperature gradients. Thermohaline circulation, also known as the ocean's conveyor belt, refers to the deep ocean density-driven ocean basin currents. These currents, which flow under the surface of the ocean and are thus hidden from immediate detection, are called submarine rivers. Ocean currents are measured in Sverdrup with the symbol Sv, where 1 Sv is equivalent to a volume flow rate of 106 cubic meters per second

Answer 2

deep ocean currents are usually formed when warm water travelling along the surface is cooled as it moves north.  

The cooled water then sinks and travels back to the equator where it is warmed once again.  Cold water is a little more dense than warm water, therefore, it travels deeper than would a warm water current.

Answer 3

Cold water sinks hot water rises, the cold fresh water from the poles sinks and moves toward the euator causing upper waters to be pulled closer to the poles in a neverending cycle...