The
Doldrums (often capitalized when referring to the geographic region) is an area of the
http://www.answers.com/topic/atlantic-ocean, the
http://www.answers.com/topic/pacific-ocean and the
http://www.answers.com/topic/indian-ocean affected by the convergence-zone, a low-pressure area around the
http://www.answers.com/topic/equator where the
http://www.answers.com/topic/prevailing-winds are calm. The low pressure is caused by the heat at the equator, which makes the air rise and travel north and south high in the atmosphere, until it subsides again in the
http://www.answers.com/topic/horse-latitude. Some of that air returns to the Doldrums through the
http://www.answers.com/topic/trade-wind. This process can lead to light or variable winds and more severe weather, in the form of heavy squalls, thunderstorms and hurricanes