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doldrums

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doldrums

the
a. a belt of light winds or calms along the equator
b. the weather conditions experienced in this belt, formerly a hazard to sailing vessels
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

doldrums

[′dōl‚drəmz]
(meteorology)
A nautical term for the equatorial trough, with special reference to the light and variable nature of the winds. Also known as equatorial calms.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

doldrums

Regions of calm, light variable winds and thunderstorms girdling the ocean near the equator and varying in extent and position according to the season. The doldrums lie between the northeasterly tradewinds of the Northern Hemisphere and the southwesterly tradewinds of the Southern Hemisphere, roughly between latitudes 10°N and 10°S. Air heated at the earth's surface rises in the doldrums region and flows northeastward and southwest-ward at heights from 0.8 to 6 km to form antitradewinds. The doldrums are low-pressure calm latitudes and the horse latitudes are high-pressure calm latitudes.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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