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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).
Tropical gyres are less unified and tend to be mostly east-west with minor north-south extent. 1  Atlantic Equatorial Current System (two counter-rotating circulations). 2  Pacific Equatorial Current System. 3  Indian Monsoon Gyres (two counter-rotating circulations in northern Indian Ocean).