Doldrums

The doldrums is a colloquial expression derived from historical maritime usage, which 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 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. Since this zone is the meeting place of two trade winds, it is also called intertropical convergence zone.

单词	Equatorial calms
释义	Equatorial calms 英语百科 Doldrums The doldrums is a colloquial expression derived from historical maritime usage, which 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 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. Since this zone is the meeting place of two trade winds, it is also called intertropical convergence zone.
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Equatorial calms

Doldrums