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A gyre in oceanography is any large system of rotating ocean currents, particularly those involved with large wind movements. Gyres are caused by the Coriolis effect; planetary vorticity along with horizontal and vertical friction, which determine the circulation patterns from the wind curl (torque).
Wind Driven Surface Currents: Gyres Background. In this section, we examine the characteristics of wind-driven surface-ocean currents, components of the huge gyres that dominate the central regions of the open ocean. Western boundary currents are the strongest segments of these gyres and often spawn warm- and cold-core eddies known as rings.