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The doldrums is a colloquial expression derived from historical maritime usage, in which it refers to those parts of the Atlantic Ocean and the Pacific Ocean affected by the Intertropical Convergence Zone, a low-pressure area around the equator where the prevailing winds are calm. The low pressure is caused by the expanding atmosphere due to heating at the equator, which makes the air rise and travel north and south high in the atmosphere, until it subsides again in the horse latitudes. Some of that air returns to the doldrums through the trade winds. This process can lead to light or variable winds and more severe weather, in the form of squalls, thunderstorms and hurricanes. The doldrums are also noted for calm periods when the winds disappear altogether, trapping sail-powered boats for periods of days or weeks. The term appears to have arisen in the 18th century, when cross-Equator sailing voyages became more common. Colloquially, the "doldrums" are a state of inactivity, mild depression, listlessness or stagnation.〔("Doldrums" ) on the Merriam-Webster Dictionary site〕 The word is derived from ''dold'' (an archaic term meaning "stupid") and ''-rum(s)'', a noun suffix found in such words as "tantrum".〔Dictionary.com, based on the ''Random House Dictionary'', Random House, Inc., 2011.〕 ==In literature== The doldrums are notably described in Samuel Taylor Coleridge's ''The Rime of the Ancient Mariner'', in Laura Hillenbrand's ''Unbroken,'' and in Patrick O'Brian's ''Desolation Island.'' Additionally, the Doldrums are a fictional place in Norton Juster's novel ''The Phantom Tollbooth''. 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「doldrums」の詳細全文を読む スポンサード リンク
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