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Global Atmosphere Vocab
Terms in this set (17)
Circulation that results from the uneven heating of a fluid; the warmer parts of the fluid expand and rise because of their buoyancy, and the cooler parts sink.
The thermally driven circulation system of equatorial and tropical latitudes consisting of two convection cells, one in each hemisphere. The existence of this circulation system was first proposed by George Hadley in 1735, as an explanation for the trade winds.
a belt of calm or light variable winds and subsiding air located near the center of the subtropical high
two belts of winds that blow almost constantly from easterly directions and are located on the north and south sides of the subtropical highs
The equatorial belt of calm or light variable winds lying between two trade wind belts
The middle cell in the three-cell global circulation model; named for William Ferrel.
the dominant west-to-east-motion of the atmosphere that characterizes the regions on the poleward side of the subtropical high
In the global pattern of prevailing winds, winds that blow from the polar high toward the subpolar low. These winds, however, should not be thought of as a persistent winds, such as the trade winds.
The stormy frontal zone separating air masses of polar origin from air masses of tropical origin.
A quasi-continuous belt of low pressure lying near the equator and between the subtropical highs.
Intertropical Convergence Zone (ITCZ)
The zone of general convergence between the Northern and Southern Hemisphere trade winds.
Several semipermanent anticyclonic centers characterized by subsidence and divergence located roughly between latitudes 25 and 35
Low pressure located at about the latitudes of the Arctic and Antarctic Circles. In the Northern Hemisphere, the low takes the form of individual oceanic cells; in the Southern Hemisphere, there is a deep and continuous trough of low pressure.
Anticyclones that are assumed to occupy the inner polar regions and are believed to be thermally induced, at least in part.
Swift geostrophic airstreams in the upper troposphere that meander in relatively narrow belts
Polar Jet Stream
a belt of powerful upper-level winds that sits atop the polar front and can bring cold weather from the north
Subtropical Jet Stream
a belt of strong upper-level winds lying above regions of subtropical high pressure that can bring warm weather from the south
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