convection cell


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convection cell

[kən′vek·shən ‚sel]
(geophysics)
A concept in plate tectonics that accounts for the lateral or the upward and downward movement of subcrustal mantle material as due to heat variation in the earth.
(meteorology)
An atmospheric unit in which organized convective fluid motion occurs.
References in periodicals archive ?
It does not occur as huge symmetric dynamic cells that directly underlie each lithospheric plate with the lithosphere as a passenger on a convection cell 'conveyor belt'.
At 12:17 CST, the convection cell moved northeast and the intensity reached 65 dBz (Figure 3).
According to the flow pattern of natural convection in dome roof tank proposed by Cotter and Charles [4], due to the predominant heat loss at the sidewall, the convection cell induced by the sidewall plays a dominant role in the tank.
Using the ESO VLT Interferometer in Chile, they discovered that the gas in the dying star's atmosphere is vigorously moving up and down, but the size of such "convection cell or bubble" is as large as the star itself.
Within the large mass of circulating air, called a convection cell, vortices often form in the region between the upwelling center and the downdrafts along its outer rim, he notes.
Mathematically, the distance between these instabilities, and hence the size of the resulting convection cell, can be shown to measure a little more than twice the thickness of the convecting layer, regardless of the specific properties of the material.
The atmosphere will be unstable and surface warming combined with wind circulation at night to stimulate strong convection cells. Residents are advised to be vigilant for lighting strikes, strong winds, sudden downpours, and flash floods.
In the upper unit, which is in direct communication with the ocean, advection of heat is the dominant heat transport mechanism, with thermal convection cells developing adjacent to the crest of the diapir (Figure 9).
With its large aperture, the telescope was probably looking through a column of air that contained numerous image-distorting convection cells, each an estimated 10 to 20 cm across.
The sun is covered with granular convection cells similar to a pot of water at a rolling boil.
"The 'X' feature is likely one of these - a former quadruple junction where four convection cells meet," NASA said.
(4) Analyzing the flow structure, we found these humps to be a result of short-range convection cells. The local dependency has been assumed to be a result of the superposition of the flow causing the wave front and short-range fluctuations.