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What causes ocean currents? Ocean currents result from two processes - the action of wind on the surface of the water, and from variation in water temperature that causes movement- a process known as convection. Convection occurs because the oceanic waters heat up becoming less dense. This water moves above the cooler water, and give off its heat to the surrounding environment. As it cools, it begins to sink, and the process begins again. Convection results in the continual circulation of ocean water on a global scale.
You'll need to login or register. Coastal geostrophic currents result from the interaction of wind and runoff along coastlines. Winds blowing parallel to a coastline can cause water to move towards the coastline, which, in turn, creates a pressure gradient that causes water to flow towards the ocean. As the water moves out to sea, the Coriolis effect will deflect it to the right or left, depending on the hemisphere.