Hadley cell


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Hadley cell

[′had·lē ‚sel]
(meteorology)
A direct, thermally driven, and zonally symmetric circulation first proposed by George Hadley as an explanation for the trade winds; it consists of the equatorward movement of the trade winds between about latitude 30° and the equator in each hemisphere, with rising wind components near the equator, poleward flow aloft, and finally descending components at about latitude 30° again.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
This pattern of upper winds flowing north to the subtropics, with the return flow of trade winds at the surface, gives what's known as the Hadley cell. This is the primary driver of weather on the planet.
The Hadley cell changes then lead to SST and atmospheric pressure anomalies east of the Philippines, which can cause either strengthening or weakening of the Northern Hemisphere jet stream and in turn affect rainfall amounts in the Southwest in the subsequent winter (November to March).
The resulting smog is trapped in Santiago by prevailing southwesterly winds pressed against the nearby Andes, and sealed from above by the descending Hadley cell air current.
It is possibly linked to the expansion of the Hadley cell. This circulation of air is a large-scale movement by which heat is distributed from the equator to the tropics, on opposite sides of the globe.
A similar pattern, called a Hadley cell, carries warm, moist air from Earth's tropics to the cooler middle latitudes.
This creates a Hadley cell from the equator to about 30 degrees north latitude (in North America this cuts through the three most southern states, at the neck of Florida, Louisiana at New Orleans, and Texas at about Houston).
"Laying near 30 degrees north the UAE is directly under the sub-tropical [jet stream convergence zone] anticyclone, known as low-altitude or the Hadley cell. There is a tendency for wind to be stronger between March and August and the prevailing wind direction is from the north-west," said the researcher.
Specifically, the study identified what it called a "clear and consistent relationship" between the high cloud field and the width of the Hadley cell, which originates from warm, rising air in the tropics of both hemispheres that then at high altitudes moves away from the equator both northward and southward before sinking back to Earth.
The additional water in the hydrological system will be transported to the wetter areas through weather systems, including the Hadley cell.'
The dominant north-south circulation pattern on Titan consists of Hadley cells that extend from the latitude of maximum heating (e.g., the equator at equinox) all the way to the poles.