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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, determine the circulation patterns from the wind curl (torque).〔Heinemann, B. and the Open University (1998) ''Ocean circulation'', Oxford University Press: Page 98〕 The term ''gyre'' can be used to refer to any type of vortex in the air or the sea, even one that is man-made, but it is most commonly used in oceanography to refer to the major ocean systems. == Major gyres == The following are the five most notable gyres:〔(The five most notable gyres ) PowerPoint Presentation〕 * Indian Ocean Gyre (generally flowing counter-clockwise) * North Atlantic Gyre * North Pacific Gyre * South Atlantic Gyre * South Pacific Gyre 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ocean gyre」の詳細全文を読む スポンサード リンク
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