Discussion
Which of the following factors affect the movement of ocean currents ?
(1) Atmospheric pressure
(2) Winds
(3) Salinity
(4) Seasonal variations in temperature
Answer: D
The answer is (1), (2), (3) and (4): all four factors.
Winds are the main driver of surface currents, dragging the water and setting up the great gyres. Differences in salinity and temperature change the density of seawater, and denser water sinks and flows, which drives the deep thermohaline circulation; seasonal changes in temperature alter these differences and the strength of currents through the year. Atmospheric pressure also matters: high pressure depresses the sea surface and low pressure lets it rise, creating slopes that water flows down.
Because every factor listed plays a part, each option that leaves one out is incomplete.
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