Question

what is the main reason behind the formation of deep ocean current ​

Answer 1

Answer:

over larger areas circular wind pattern create hills and valleys on the ocean surface Deep ocean current are caused by difference in water temperature and slainity

Answer 2

Deep ocean currents (also known as Thermohaline Circulation) are caused by:

The density of sea water varies globally due to differences in temperature and salinity. Surface water is heated by the sun, and warm water is less dense than cold water. Similarly, fresh water is less dense than salty water. At northern latitudes, surface water is cooled by extremely cold air. This cool water can becomes denser than the underlying water causing it to sink. The sinking and transport of large masses of cool water gives rise to the thermohaline circulation, which is driven by density gradients due to variations in temperature and salinity.

The earth’s rotation also influences deep ocean currents

In general, wind-driven currents dominate the upper ocean, and thermohaline circulation drives the movement of the deep ocean.