What are the doldrums?
The Doldrums (often capitalized when referring to the
geographic region) is an area of the atlantic-ocean, the
pacific-ocean and the indian-ocean affected by the
convergence-zone, a low-pressure area around the equator where the
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
horse-latitude. Some of that air returns to the Doldrums through
the trade-wind. This process can lead to light or variable winds
and more severe weather, in the form of heavy squalls,
thunderstorms and hurricanes.
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. Ships would once get stuck in this area
because their sails would just flap and they couldn't sail on. The
word has also come to mean a certain mood where you're depressed
because you feel you're just not getting anywhere.